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Measuring signal energy

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343 - Communications: radio wave antennas

343700000 - ANTENNAS

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DocumentTitleDate
20130044033TEST SYSTEM WITH ADJUSTABLE RADIO-FREQUENCY PROBE ARRAY - Electronic device structures may be tested using a radio-frequency test system. The radio-frequency test system may include radio-frequency test equipment and an associated test fixture. The radio-frequency test equipment may be used in generating and measuring radio-frequency signals. The test fixture may contain adjustable structures that allow the positions of radio-frequency test probes to be adjusted. The test system may be configured to position radio-frequency probes in the test fixture so that some probe contacts form electrical connections with conductive antenna structures. The radio-frequency probes may contain other contacts that are positioned to form electrical connections with conductive electronic device housing structures. During radio-frequency testing, the test equipment in the test system may apply radio-frequency test signals to the device structures under test using the test probes. Corresponding radio-frequency test signals may be measured by the test equipment.02-21-2013
20130027256METHOD AND SYSTEM FOR TESTING OVER-THE-AIR (OTA) PERFORMANCE IN MULTI-ANTENNA SYSTEM - The present invention discloses a method and system for testing OTA performance in a multi-antenna system. Multiple antennas are set in an anechoic chamber; a BS simulator is controlled to transmit benchmark test signal to DUT through a channel emulator and antennas; when determining the benchmark test signal does not meet set requirement, the benchmark test signal is adjusted until set requirement is met; corresponding test cases are determined according to different channel models; according to channel models, the channel emulator performs channel simulation processing on test signal output from the BS simulator and sends the test signal to DUT through antennas; after DUT receives the test signal, each OTA performance is tested according to OTA performance test items corresponding to test cases; and DUT is judged to reach the standard when all OTA performances reach the standard. The present invention is easy to implement and has a low cost.01-31-2013
20090303141REVERBERATION CHAMBER - To construct a reverberation chamber, a chamber provided with reflecting walls contains an antenna and a field stirrer which are placed opposite an object to be tested. By modifying an orientation of a main direction of irradiation from the antenna, a very large number of cavity modes are created inside the chamber, achieving the required variety of possible impingements on the object to be tested, such that the test carried out is as conclusive as possible and the least dependent possible on the dimensions and characteristics of the chamber.12-10-2009
20120162031METHOD FOR PREDICTING PHASE PATTERN USING MAGNITUDE PATTERN IN NEAR-FIELD OR FRESNEL FIELD - Disclosed is a method for predicting a phase pattern using a magnitude pattern in near-field or Fresnel field formed by antenna radiation, including: determining a first parameter group including a first actual distance between a source antenna and a probe and the magnitude pattern at the first distance; assuming a second parameter group including a second distance that is an effective distance between the source antenna and the probe, a current magnitude distribution of the source antenna and a current phase distribution of the source antenna, based on the first parameter group; calculating the magnitude pattern at the first distance based on the second parameter group; and determining the phase pattern at the first distance when the magnitude pattern at the calculated first distance matches with the magnitude pattern at the first distance included in the first parameter group by the comparison therebetween.06-28-2012
20090128429METHOD OF INHIBITING CROSS-POLARIZATION OF MICROSTRIP ANTENNA AND A DEVICE THEREOF - A method of inhibiting cross-polarization of a microstrip antenna and a device thereof. Increase of a microstrip antenna array not only increases co-polarization, but also increases cross-polarization. When the microstrip antenna is designed and fabricated, the fabricated antenna is tested first. That is, intensity distribution of the cross-polarization in a radiation frequency band is tested first, and a radiation frequency that the cross-polarization is corresponding change with is found out when an antenna radiation unit is broken. A slot is fabricated in the corresponding antenna radiation unit to break the symmetry of the antenna radiation unit, so as to effectively inhibit the cross-polarization without influencing the co-polarization of the antenna radiation unit at a corresponding radiation frequency.05-21-2009
20100149054RADIO WAVE ABSORBER, ELECTROMAGNETIC FIELD MEASUREMENT SYSTEM AND RADIATED IMMUNITY SYSTEM - A radio wave absorber for use in an electromagnetic field probe that measures an electromagnetic field by means of an antenna section provided therewith, the radio wave absorber including: a first end section; a second end section that is located at a position opposite the first end section; and an intermediate section that is located between the first and second end sections, the intermediate section having outer dimension and thickness that increase in accordance with a distance from the first end section toward the second end section.06-17-2010
20090027280MICRO-SCALE RESONANT DEVICES AND METHODS OF USE - The invention relates to micro-resonant devices (MRDs) that generate resonance at radio frequencies not present in an animal or human body, or present at low, background levels in the body. These individual, often monolithic devices, can be located in three-dimensional space and tracked anywhere in a target area, e.g., in a human or animal body, or within a cell within a body, using a conventional magnetic resonance imaging (MRI) scanner or other transducers, e.g., radiofrequency transducers. The MRDs generate high sensitivity contrast in conventional clinical MRI scanners, have a diameter of anywhere from a few nanometers to 1000 microns, and can in some embodiments be manufactured using Micro-Electro-Mechanical Systems (MEMS) technology. The devices are optionally coated to isolate them from the environment, and this coating can be a biocompatible coating for medical and biotechnology uses.01-29-2009
20090121950OPTICAL FIBER COUPLED ANTENNA CURRENT MONITOR - A system for sensing the amplitude and phase of an RF current flowing in an antenna element of a directional antenna system that uses a sampling device such as a current sample loop that is connected to an antenna monitor with fiber optic cable. The system uses an interface at the current sample loop on each of the antenna elements to convert an RF current sample to an optical signal. The fiber optic cable transmits the optical signal to the antenna monitor where it is converted back to an electrical signal for appropriate phase and amplitude comparison with the RF currents sampled from other antenna elements in the directional antenna system.05-14-2009
20100073246SYSTEM AND METHOD FOR MEASURING ANTENNA RADIATION PATTERN IN FRESNEL REGION BASED ON PHI-VARIATION METHOD - Provided is a system and method for measuring an antenna radiation pattern in a Fresnel region based on a phi-variation method. The system includes a rotator for changing angles of a reference antenna and a target antenna; a vector network analyzer for obtaining radiation pattern data in accordance with transmission/reception radio frequency (RF) signals between the reference antenna and the target antenna; a measurement unit for calculating a far-field radiation pattern based on the radiation pattern data received from the vector network analyzer; and a controller for controlling the rotator according to a measurement angle transmitted from the measurement unit.03-25-2010
20100045542TESTING METHOD OF MULTIBAND ANTENNA - A testing method of a multiband antenna is provided. The testing method includes the following steps. Firstly, whether a testing angle of a multiband antenna is less than a default vale is determined, and if the testing angle is less than a default vale, then the testing frequency is set equal to a first default frequency according to the frequency table so as to obtain a first testing result corresponding to the first default frequency when the multiband antenna is at the testing angle. Next, whether the testing frequency needs to be changed is determined, and if the testing frequency needs to be changed, then the testing frequency is set equal to a second default frequency according to the frequency table so as to obtain a second testing result corresponding to the second default frequency when the multiband antenna is at the testing angle.02-25-2010
20120206304HYBRID REFLECTOMETER SYSTEM (HRS) - A RF signal test and measurement system capable of measuring forward and reverse signal parameters of RF components including Electrically Small Antennas (ESA) and capable of being integrated within a communications system to aid the automatic retuning of antennas.08-16-2012
20100109957APPARATUS FOR MEASURING ANTENNA RADIATION PERFORMANCE AND METHOD OF DESIGNING THE SAME - Provided are an antenna radiation performance measuring apparatus and a method for designing the same. The apparatus includes a chamber configured to include a transmit antenna radiating electromagnetic wave, a receive antenna receiving the electromagnetic wave, and an electromagnetic wave absorber absorbing the electromagnetic wave, and a reflector disposed on one side of the chamber between the transmit antenna and the receive antenna, inclined at a predetermined angle, and configured to reflect an electromagnetic wave radiated in a direction to the one side from the transmit antenna.05-06-2010
20100109956 METHOD FOR DETERMINING THE ANTENNA MINIMUM MEASUREMENT DISTANCE - A method for determining the minimum measurement distance of an antenna of a wireless mobile terminal, comprising the following steps: establishing a test environment of an antenna of a wireless mobile terminal to be tested; determining electromagnetic scattering dimension of the antenna of the wireless mobile terminal to be tested and an electromagnetic scattering body in a predetermined spatial area in the test environment; and calculating the minimum measurement distance of the antenna of the wireless mobile terminal according to the determined electromagnetic scattering dimension. Electromagnetic scattering dimension of the mobile phone antenna and the electromagnetic scattering body in the predetermined spatial area is determined and measured in a simulated network environment in an electric wave anechoic chamber, and parameters of the minimum measurement distance of the mobile phone antenna can be calculated and obtained. The method has low requirement on environment and is easy to be tested and convenient to be carried out.05-06-2010
20090091503METHOD AND SYSTEM FOR TUNING AN ANTENNA - Method and system for tuning a tunable antenna uses a comparison between a signal response at two different tuning frequencies to determine how or if the tuning needs to be further adjusted. With the approach, the method and system arrive at a frequency shift that is centered about the desired antenna frequency, which point there is no net change in the signal response. In a further aspect, a frequency to which a tuned antenna is tuned is shifted to verify whether the antenna is still in tune. Modifications to minimize disturbance of the output received signal that would otherwise be caused by the frequency shifting are contemplated.04-09-2009
20090284425ANTENNA TEST SYSTEM - A method and system are provided for testing antenna systems using position determination, orientation determination, test pattern analysis using a variety of factors and equipment including positions and orientation of antenna(s) under test at specific points and signal processing systems.11-19-2009
20110037666DEVICE AND METHOD FOR DETECTING DEFECTS WITHIN THE INSULATION OF AN INSULATED CONDUCTOR02-17-2011
20130063315METHODS AND APPARATUS FOR DETERMINING PARAMETERS OF AN ARRAY - Methods and apparatus for determining parameters for an array are described. An exemplary embodiment of a method determines a set of parameters for an antenna array including multiple array elements, the array being fed by a feed array including a plurality of feed elements. The embodiment of the method includes measuring a plurality of bistatic ranges R03-14-2013
20090237312Antenna - The present invention involves a transmitting antenna system that includes at least one high impedance transmitting antenna element, a voltage sampling device, and monitoring equipment. The antenna element(s) each have a driving point that receives radio signals from a radio frequency power source. A voltage sampling device measures the voltage magnitude and phase of the radio signal at the driving point of each antenna elements. A voltage sampling device is physically located near each of the antenna elements being monitored and each voltage sampling device transmits information relating to phase and voltage magnitude to the monitoring equipment that is located remote of at least one of the antenna elements. The monitoring equipment can compare the phase and voltage magnitude of each of the antenna elements in the transmitting antenna system to a pre-determined set of values and/or to the values of the other antenna element(s) in the transmitting antenna system.09-24-2009
20100045543RADIATION EFFICIENCY MEASURING APPARATUS AND RADIATION EFFICIENCY MEASURING METHOD - A target antenna 02-25-2010
20090009410Positioning, detection and communication system and method - A positioning, communication, and detection system designed to provide a three dimensional location of an object, navigation tools, and bidirectional surface-to-subsurface communications, and methods of using the system. The system can include one or multiple transmitters comprising electromagnetic beacons, software defined radio receivers with an associated processing unit and data acquisition system, and magnetic antennas. The system may use theoretical calculations, scale model testing, signal processing, and sensor data.01-08-2009
20110043418RADIATED POWER MEASUREMENT METHOD, RADIATED POWER MEASUREMENT COUPLER AND RADIATED POWER MEASUREMENT APPARATUS - In a method of measuring a radiation power generated from a DUT from an output of a measurement antenna, wherein the DUT is arranged in an ellipsoid enclosed space such that a radiation center of the radio wave is substantially coincided with the neighborhood of a first focal point. The radio wave radiated from the DUT and reflected from the wall surface is received by a receiving antenna arranged in the neighborhood a second focal point thereby to measure the total radiated power of the DUT from the output signal of the receiving antenna. One of the DUT and the receiving antenna is moved along the axis passing through the first and second focal points, and based on the measurement value maximizing the output signal power of the receiving antenna, calculating the total radiated power of the DUT.02-24-2011
20120062431Front End Module Comprising an Antenna Tuner - A front end module for a wireless transmission/reception device has two antennas and two signal paths connected thereto. A mismatch in the antenna is identified by monitoring the transmitted power and the reflected power in the active and passive signal paths and using the powers in a controller to generate a control signal for the antenna tuner. In this case, decreasing isolation between the first and second antennas and the first and second signal paths is identified, and is compensated for using different devices, in order to ensure faster and safer antenna matching.03-15-2012
20110279334Resonant Cavity Injection-Based Calibration of a Radiant Energy Device - The present invention, as typically embodied, implements an energy source, a transmitting antenna, a receiving antenna, a resonant cavity, and an electricity meter (e.g., voltmeter, ammeter, or power meter) to calibrate an electronic device. Firstly, the receiving antenna is calibrated based on measurement of power that has been generated and transmitted in known quantity, propagated through air, and received by the receiving antenna. Secondly, the resonant cavity is connectively situated between the transmitting antenna and the receiving antenna; the resonant cavity is calibrated based on measurement of power that has been generated and transmitted in the same quantity, propagated through the resonant cavity, and received by the receiving antenna. Thirdly, an electronic device is substituted for the receiving antenna; the electronic device is calibrated based on measurement of power that has been generated and transmitted in the same quantity, propagated through the resonant cavity, and received by the electronic device.11-17-2011
20100171669Measurement apparatus and method thereof - A measurement apparatus includes an anechoic chamber, a DUT board, rotation units, and a feeding arm. The anechoic chamber has inner-walls. Each inner-wall is covered with a radio wave absorber. One of the inner-wall is a first wall with an aperture and the other inner-walls are second walls. The DUT board holds a first antenna to be measured with radiation property and a probe to detect a signal from the first antenna. A part of the DUT board is inserted into the anechoic chamber through the aperture opened in the first wall. One end of the feeding arm holds a second antenna radiating a radio wave to the first antenna in the anechoic chamber. Each rotation unit provides on each second wall and is selectively attached to the other end of the feeding arm for rotating the second antenna and for feeding to the second antenna.07-08-2010
20110128196ANTENNA EVALUATING APPARATUS FOR EVALUATING MULTIPLE WAVE OF RADIO WAVES TRANSMITTED FROM SCATTERER ANTENNAS WITH FUNCTION OF SUBSTANTIALLY SIMULTANEOUS STOP AND START - A transmitting signal from a signal generator is divided in seven transmitting signals in a divider, and the phase and the amplitude of each of divided transmitting signals are changed in a phase shifter circuit and an attenuator circuit. The respective transmitting signals from the attenuator circuit are radiated from scatterer antennas. A receiver receives a multiple wave of radiated radio waves by using a receiving antenna. A computer substantially simultaneously starts operations of a D/A converter, the signal generator, and the receiver by using a trigger generator circuit.06-02-2011
20100007565Detecting In-Phase and Quadrature-Phase Amplitudes of MIMO Communications - Circuits detect communications from multiple transmitting antennas to multiple receiving antennas. A respective first block for each non-initial transmitting antenna determines partial distances for pairings of a first candidate and a quadrature-phase amplitude. A respective second block for the initial transmitting antenna determines partial distances for combinations of phase amplitudes. A respective second block for each non-initial transmitting antenna determines partial distances for pairings of a second candidate and an in-phase amplitude. A respective first selector for each non-initial transmitting antenna selects the first candidates from the pairings for the respective second block having smaller partial distances. A respective second selector for each non-initial transmitting antenna selects the second candidates from the pairings for the respective first block having smaller partial distances. An identifier circuit selects a final candidate with a smaller partial distance from the pairings of the respective second block for the last transmitting antenna.01-14-2010
20110298672ANTENNA ORIENTATION DETERMINATION - A method of determining a current orientation of an antenna compared to a desired orientation is presented. In the method, current orientation data indicating a current orientation of the antenna is generated in circuitry mounted to the antenna. Data indicating a desired orientation for the antenna at the geographical location of the antenna is received. The desired orientation data is compared with the current orientation data. Based on this comparison, alignment information is generated which indicates whether the current orientation of the antenna aligns with the desired orientation of the antenna.12-08-2011
20110298673FULL ANECHOIC CHAMBER FOR RADIATION EMISSION AND RADIATION SUSCEPTIBILITY TESTS - A full anechoic chamber includes a first sidewall, a second sidewall substantially perpendicular to the first sidewall, a third sidewall opposite to the first sidewall, a fourth sidewall opposite to the second sidewall, a top wall substantially perpendicular to the first sidewall, and a bottom wall opposite to the top wall. The full anechoic chamber further includes an antenna holder system fixed on the bottom wall, an antenna detachably held by the antenna holder system and having a center axis thereof, and a loading table rotatably positioned on the bottom wall. The full anechoic chamber is symmetrical about a reference plane which extends along a direction substantially parallel to the second and fourth sidewalls and through the centers of the first and third sidewalls. The center axis of the antenna is arranged at an angle of about 8 degrees relative to the reference plane.12-08-2011
20110128197ANTENNA EVALUATION APPARATUS AND ANTENNA EVALUATION METHOD FOR CREATING MULTIPATH WAVES AROUND RECEIVING ANTENNA - An antenna evaluation apparatus includes receiving antennas to be evaluated, scatterer antennas provided around them, signal generators, delay circuits, dividers, phase-shift circuits, and attenuation circuits. A computer controls the delay circuits to add delay times to radio frequency signals, and controls the phase-shift circuits and attenuation circuits to change phases and amplitudes of the radio frequency signals to produce a first fading. The antenna evaluation apparatus radiates the radio frequency signals from the scatterer antennas, thus creating multipath waves including delay and fading around the receiving antenna.06-02-2011
20120098713SYSTEM FOR TESTING MULTI-ANTENNA DEVICES USING BIDIRECTIONAL FADED CHANNELS - A test system for testing multiple-input and multiple-output (MIMO) systems is provided. The test system may convey radio-frequency (RF) signals bidirectionally between a base station emulator and a device under test (DUT). The DUT may be placed within a test chamber during testing. An antenna mounting structure may surround the DUT. Multiple antennas may be mounted on the antenna mounting structure to transmit and receive RF signals to and from the DUT. A first group of antennas may be coupled to the base station emulator through downlink circuitry. A second group of antennas may be coupled to the base station emulator through uplink circuitry. The uplink and downlink circuitry may each include a splitter, channel emulators, and amplifier circuits. The channel emulators and amplifier circuits may be configured to provide desired path loss and channel characteristics to model real-world wireless network transmission.04-26-2012
20100039335APPARATUS AND METHOD FOR MEASURING ANTENNA GAIN USING SUN - Provided are an apparatus and method for measuring an antenna gain. The apparatus includes an antenna gain-to-noise-temperature (G/T) ratio calculator for calculating a G/T ratio using a reception noise power measured while an antenna is tracking the sun, a noise temperature measurer for measuring a noise temperature when a signal is transmitted or received through the antenna, and an antenna gain calculator for calculating an antenna gain using the calculated G/T ratio and the measured noise temperature. Thus, it is possible to easily measure the antenna gain of a ground station without a reference antenna or a satellite-mounted device capable of functioning as a reference antenna.02-18-2010
20080309566Antenna System, Access Control System for a Vehicle and Diagnosis Method - An antenna system (12-18-2008
20080309565SIGNAL MEASUREMENT SYSTEM AND METHOD FOR TESTING AN RF COMPONENT - A signal measurement system tests an RF component in an RF test facility, such as an RF anechoic chamber. The system includes a repeater which is connected to an exterior antenna disposed outside the chamber and a transmitting antenna disposed inside the chamber. The repeater receives the RF broadcast signal from the exterior antenna and rebroadcasts it as an RF testing signal inside the chamber. The subject antenna receives the RF testing signal, which is then analyzed with a computer. The repeater may also modify the RF testing signal to produce a wide variety of test situations that mimic those available in a traditional field-test.12-18-2008
20100033386USING MULTIPLE ANTENNAS TO CHARACTERIZE A COMPUTER SYSTEM BASED ON ELECTROMAGNETIC SIGNALS - Some embodiments of the present invention provide a system that characterizes a computer system parameter by analyzing a target electromagnetic signal radiating from the computer system. First, the target electromagnetic signal is monitored using a first antenna and a second antenna, wherein an axis of the second antenna is oriented non-parallel to an axis of the first antenna. Then, the target electromagnetic signal received from the first antenna and the target electromagnetic signal received from the second antenna are separately analyzed to characterize the computer system parameter.02-11-2010
20100033387METHOD FOR TUNING GLASS ANTENNA - The present invention relates to a method of tuning a glass antenna that is capable of analyzing the sensitivity of each point, and forming a structure of a glass antenna by making use of a common simulation tool so as to perform tuning depending on a priority that is determined by data obtained by analyzing the sensitivity.02-11-2010
20120293379TESTING SYSTEM WITH ELECTRICALLY COUPLED AND WIRELESSLY COUPLED PROBES - Conductive electronic device structures such as a conductive housing member that forms part of an antenna may be tested during manufacturing. A test system may be provided that has a pair of pins or other contacts. Test equipment such as a network analyzer may provide radio-frequency test signals in a range of frequencies. The radio-frequency test signals may be applied to the conductive housing member or other conductive structures under test using the test probe contacts. An antenna may be used to gather corresponding wireless radio-frequency signal data. Forward transfer coefficient data may be computed from the transmitted and received radio-frequency signals. The forward transfer coefficient data or other test data may be compared to reference data to determine whether the conductive electronic device structures contain a fault.11-22-2012
20080316123ELECTROMAGNETIC WAVE MEASURING METHOD AND ELECTROMAGNETIC WAVE MEASURING APPARATUS - An electromagnetic wave measuring method is provided that is capable of performing high-precision measurement in a shorter time and in a greater variety of frequency bands than heretofore with a comparatively simple configuration. A plate-like antenna (12-25-2008
20100039333Antenna Coupler - An antenna coupler for testing a transmitter and/or receiver device for wireless communication, in particular, a mobile telephone, comprises a holding element for the transmitter and/or receiver device and several antenna elements, which are arranged in such a manner that the directions of maximum radiation or respectively directions of maximum sensitivity of the antenna elements are oriented differently relative to one another in space.02-18-2010
20100085260Adaptively tunable antennas and method of operation therefore - An embodiment of the present invention is a method, comprising improving the radiated harmonic distortion of a transmitting antenna system by sensing the RF voltage present on a variable reactance network within the antenna system; controlling the bias signal presented to the variable reactance network; and maximizing the RF voltage present on the variable reactance network.04-08-2010
20100090915System And Method For Determining The Beam Center Location Of An Antenna - A system and method for determining the beam center location of an antenna, such as a global positioning system (GPS) antenna, are provided. A system for determining the beam center of an antenna may include a plurality of radio frequency (RF) probes, such as Integrated Transfer System (ITS) antenna elements, located at respective predefined positions surrounding the geometrical center of the antenna. The system may also include at least one detector configured to provide a measure of the RF power detected by each respective RF probe. The system may also include a processor configured to determine the beam center of the antenna based upon the predefined position of each RF probe and the measure of the RF power detected by each respective RF probe. A corresponding method is also provided.04-15-2010
20080211724Millimetre-Wave Detection Device for Discriminating Between Different Materials - The detection device that can be used for detecting objects behind clothing etc including a dielectric lens and a receive element sensitive to millimetre wave radiation. Prior art systems produce an image of a scene usually using scanning optics. This can be large and expensive. The present invention instead takes spot readings from different parts of a scene without building up an image. The spot readings are processed, and an indication given to a user if certain characteristics of the readings are observed. Typical characteristics used are the differences in absolute received power level, and the power level at different polarisations. Such characteristics are typically present is an object of interest is in the scene. Also disclosed are various methods of altering the received beam to get readings from different areas from the scene, such as changing the beam width, or beam angle.09-04-2008
20090284426Method and Software for Spatial Pattern Analysis - A method and software implementation for spatial pattern analysis. A user-guided test procedure is implemented to measure features of an antenna under test to determine the antenna's far-field patterns. The antenna features include RF amplitude or phase, and position and orientation relative to a receiving object.11-19-2009
20130099985SYSTEM FOR SIMULATING ELECTROMAGNETIC ENVIRONMENTS INCLUDING A NETWORK OF A PLURALITY OF PROBES - The invention concerns a system for simulating electromagnetic environments, including a network of emitting and/or receiving probes to test at least one test antenna, channels for connecting the probes to a channel emulator, a signal emitting unit, a signal receiving unit, one of the units being connected to the emulator. The invention is characterized by a switching device having a first measurement position, in which the device connects the emulator respectively to at least one of the probes via the associated channel and connects the other unit to the test antenna, and a second position for calibrating the channels, in which the switching device connects the emulator to the other unit via the associated channel without passing through the network of probes.04-25-2013
20080278387System of Transmit Antennas Adapted to Propagation Conditions for Radio Broadcasting - To broadcast synchronized radio waves in at least one frequency band in a predetermined territory, antennas (AS, ATI, AE) emit waves to respective coverage areas in which receivers (RQ, RB) measure characteristics of the emitted waves and transmit to a central server (SC) . The server analyzes the characteristics (CO) as a function of prediction models for broadcasting waves in the territory in order to determine adjustment parameters for the antennas. The server transmits the adjustment parameters to the antennas to control them in order to offer a greater diversity of radio broadcasting services and to optimize coverage areas according to different wave propagation modes.11-13-2008
20080284664Method of and Device for Determining at Least One Characteristic Parameter of a Resonant Structure - A method of determining at least one characteristic parameter of a resonant structure (11-20-2008
20090033572SYSTEM AND METHOD OF MEASURING TOTAL RADIATED POWER FROM MOBILE WIRELESS COMMUNICATIONS DEVICE - A system for testing a communications device includes a portable wireless communications device comprising a transmitter for transmitting an RF signal. A monitoring device receives the RF signals from the portable wireless communications device and analyzes the RF signals to determine total radiated power emitted from the transmitter. An adaptive antenna equivalent circuit is coupled to the transmitter. A connection line extends between the adaptive antenna equivalent circuit and the monitoring device. The adaptive antenna equivalent circuit has an equivalent antenna impedance matched to the portable wireless communications device and the connection line and monitoring device based on transmit frequency to ensure that total radiated power of the RF signals is transmitted from the transmitter to the monitoring device.02-05-2009
20110205130Methods and apparatus for determining parameters of an array - Methods and apparatus for determining parameters for an array are described. An exemplary embodiment of a method determines a set of parameters for an antenna array including multiple array elements, the array being fed by a feed array including a plurality of feed elements. The embodiment of the method includes measuring a plurality of bistatic ranges Rijk through different signal path combinations, each signal path combination from a feed element “i,” to an array element “j,” and to a feed element “k”. The measuring includes radiating energy from feed element “i”, and reflecting some of the radiated energy from array element “j” back to feed element k of the feed array. The measured bistatic ranges are processed to solve for the set of parameters.08-25-2011
20080278386Radar apparatus and alignment sensor - A radar apparatus including: a radar antenna array; and, a sensor for detecting a relative distortion of at least one portion of the radar antenna relative to at least one other portion of the radar antenna array.11-13-2008
20080272968Device for Transmitting and/or Receiving High-Frequency Signals in an Open or Closed Space System - A device for transmitting and/or receiving high-frequency signals in an open or closed, spatial system, wherein the device is embodied as an array antenna, which transmits and receives high-frequency signals with a specified form of wavefront. The array antenna comprises a support structure with transmitting and/or receiving antenna elements. The support structure comprises a dielectric material, wherein a transmitting/receiving unit is provided, at least one feeding network is provided for transferring the high-frequency signals between the transmitting/receiving unit and the transmitting and/or receiving, antenna elements, and wherein a control/evaluation unit is provided. The device provides an inexpensive, compact and resistant device fortransmitting and receiving high-frequency signals, which is distinguished by an optimized radiation characteristic.11-06-2008
20100134364ELECTROMAGNETIC WAVE MEASURING APPARATUS - An electromagnetic wave measuring apparatus includes: a reception antenna receiving an electromagnetic wave generated from an electronic apparatus placed at a predetermined distance away; an antenna mast holding the reception antenna; and a base portion fixing an end of the antenna mast vertically to a floor, the base portion having a flat bottom surface opposed to the floor, the bottom surface and the floor forming a gap of 2 mm or less therebetween and being capacitively coupled to each other. The base portion includes a mast-fixing portion having a height of 45 mm or less vertically to the floor and fixing the end of the antenna mast, a power portion being disposed at a position away from the reception antenna and generating power, and a power transmission portion transmitting the power generated by the power portion to the reception antenna and vertically moving the reception antenna along the antenna mast.06-03-2010
20090015491ELECTROMAGNETIC WAVE SENSOR, IMAGING ELEMENT AND IMAGING DEVICE - The present invention enables to provide a simple and inexpensive electromagnetic wave sensor that selectively detects sub-millimeter waves and millimeter waves in a specific frequency band, an imaging element and an imaging device. The distance of the gap between a plurality of antenna elements is smaller than the wavelength of infrared light. A capacitor electrically formed by the gap between the plurality of antenna elements, and an electrical resistor portion form parallel circuits electrically coupled to the antenna portion. The plurality of antenna elements are formed so that the impedance of the antenna portion is matched with the impedance of the parallel circuits against electromagnetic waves having a predetermined frequency, and is not matched against the higher harmonics of electromagnetic waves having the predetermined frequency.01-15-2009
20090027282Antenna With Integrated Parameter Storage - In a method and system for identifying an antenna, an antenna identifier is coupled to the antenna. The antenna identifier is a memory device that stores at least one attribute to identify the antenna. The antenna includes an electromagnetic radiation element coupled to a signal port and a coupling device coupled in-between the signal port and the antenna identifier. A data signal received at the signal port is isolated by the coupling device and provided to the antenna identifier. The data signal is provided by a radio device and/or an information handling system (IHS) coupled to the antenna via the signal port. The radio device and/or the IHS is operable to read one or more values for the at least one attribute stored in the antenna identifier.01-29-2009
20110140974TESTING CIRCUIT BOARD - An exemplary testing circuit board is used for testing an antenna performance and includes a signal circuit layer, a base layer electrically connected to the signal circuit layer, and a test unit. The signal circuit layer can transmit test signals from the antenna. The base layer is fixed with the signal circuit layer and used as a ground section to shield the test signals. The test unit is electrically connected to the signal circuit layer and the base layer and includes a signal inception port. The signal inception port is positioned on the signal circuit layer and protrudes from the base layer, and the signal inception port is capable of receiving the test signals and transmitting the test signals to the signal circuit layer.06-16-2011
20090096686AUTONOMOUS MOBILE WIRELESS ANTENNA SYSTEMS - Systems and methods are disclosed for deploying one or more antennas by: mounting one or more antennas on a moving platform; searching a physical space and a signal space to locate a predetermined position for the one or more antennas to optimize data transmission; and actuating the moving platform to the predetermined position.04-16-2009
20090231217RADIATION DIAGRAM MEASURING SYSTEM FOR A TRANSMITTING ANTENNA - The measuring system includes a receiver including at least one fixed receiving antenna for picking up electromagnetic fields generated by a transmitting antenna belonging to an electronic device, and a positioning device on which a support element is placed. The positioning device includes mechanisms for driving the support element in rotation. The measuring system further includes a detection device for detecting position/orientation of the transmitting antenna, and a data processing station. A hollow spherical element houses the electronic device and is held on the positioning device by gravity on three points, one of which is formed by a drive member, and the two other points are formed using ball and socket joints. Several circular barcodes arranged on the external surface of the spherical element enable the system to determine the position/orientation of the spherical element using the digital camera.09-17-2009
20090102730APPARATUS AND METHOD FOR PREDICTING WAVE PROPAGATION CHARACTERISTIC OF MULTIPLE ANTENNA SYSTEM - There is an apparatus for predicting wave propagation characteristic of a multiple antenna system, including: a transmission position calculator for calculating transmission positions of multiple transmitting antennas; a wave propagation path searcher for searching for a wave propagation path for each of a plurality of image antennas generated for each of said multiple transmitting antennas; a reflection electric field calculator for calculating a partial reflection electric field on the searched propagation path; and a received power calculator for calculating a received power based on the calculated partial reflection electric field.04-23-2009
20100013722Systems, Methods, and Computer Program Products for Determining Performance of Portable Electronic Devices - A link performance analysis (LPA) system is provided for multi-path radio frequency (RF) testing. The LPA system includes a shielded chamber and an antenna positioned in the chamber. A rotating turntable is positioned in the chamber and spaced apart from the antenna. A rotating screen is positioned in the chamber between the antenna and the rotating turntable. A plurality of stationary screens are spaced apart from and surrounding the rotating turntable. Related methods and computer program products are also provided.01-21-2010
20100141539Antenna system - In an antenna array, in particular for diversity operation, a cohesive radiofrequency-conductive area (06-10-2010
20090073063METHOD AND APPARATUS FOR POLARIZATION DISPLAY OF ANTENNA - The invention discloses a method and apparatus for polarization display of antenna. The apparatus for polarization display of antenna comprises a selecting means for selecting a plurality of predetermined radiation directions from radiation directions of an antenna, a mapping means for mapping the plurality of predetermined radiation directions into a coordinates chart, an obtaining means for obtaining corresponding radiation data for the antenna in the plurality of predetermined radiation directions, and a plotting means for plotting a polarization pattern of the antenna in the plurality of predetermined radiation directions on the coordinates chart, according to the radiation data. With the method and apparatus of the invention, all polarization information of the antenna in each radiation direction can be provided with only one FIGURE.03-19-2009
20090073062Antenna Selection Scheme for Multiple Antennae - A method and system to select an antenna from a plurality of antennae used for wireless communications. A first embodiment is a method to select an antenna from a plurality of antennae. The method includes monitoring at least one antenna during a fraction of at least one preamble period of a frame to derive at least one quality indicator corresponding to the antenna; storing the quality indicator derived from monitoring the antenna during the fraction of the preamble period of a frame; and selectively switching to a selected antenna after a number of frames, based on the quality indicator. A second embodiment is another method to select an antenna from a plurality of antennae. These embodiments can be applied in several wireless communication applications using multiple antennae including, but not limited to, WiMAX applications.03-19-2009
20090073061Pre-Alignment Outside An Antenna Measurement Range - A method is disclosed for optically pre-aligning and referencing an antenna set-up outside an antenna measurement range. The pre-alignment is performed in an integration room close to the antenna measurement range in order to avoid unnecessary occupation of the measurement range. The method teaches a technique using generally a pair of high accuracy theodolites (T03-19-2009
20110032162ANTENNA TESTING DEVICE AND ANTENNA TESTING METHOD USING THE SAME - An antenna testing device includes an analyzer, a transmission probe electrically connected to the analyzer, a receiving probe electrically connected to the analyzer, and a shielded box having a cutoff frequency. The analyzer generates a test signal the frequency of which is lower than the cutoff frequency, the transmission probe receive the test signal and sends the test signal to the shielded box. The antenna is coupled with the transmission probe and generates a coupled signal, the receiving probe receives the coupled signal and sends the coupled signal to the analyzer. The analyzer analyzes the coupled signal and the test signal, the analyzer calculates the return loss of the antenna.02-10-2011
20090109103Electromagnetic compression apparatus, methods, and systems - Apparatus, methods, and systems provide electromagnetic compression. In some approaches the electromagnetic compression is achieved with metamaterials. In some approaches the electromagnetic compression defines an electromagnetic distance between first and second locations substantially greater than a physical distance between the first and second locations, and the first and second locations may be occupied by first and second structures (such as antennas) having an inter-structure coupling (such as a near-field coupling) that is a function of the electromagnetic distance. In some approaches the electromagnetic compression reduces the spatial extent of an antenna near field.04-30-2009
20110037667Antenna Arrangement and Test Method - A method including providing a matching circuit, a first contact connected, without an intervening test connector to a transmitter and/or a receiver, and a second contact, separate from the first contact, connected to the matching circuit; sensing a parameter of the transmitter and/or the receiver by connecting test apparatus to the first contact; and providing an antenna element for coupling with the first contact and the second contact.02-17-2011
20110115680METHOD OF ESTIMATING THE FOCUSING QUALITY OF A SIGNAL PRE-EQUALIZED BY TIME REVERSAL - A method is provided for estimating the focusing quality of a signal pre-equalized by time reversal of an estimated propagation channel between a source antenna of a source communicating entity and a destination antenna of a destination communicating entity, the method comprising a step of evaluating a focusing quality of the signal received at the destination antenna relative to a value at a focal point of a representation of a curve of received power as a function of a distance between the destination antenna and the focal point.05-19-2011
20100164815METHOD OF MEASURING RADIATION CHARACTERISTIC OF ANTENNA - Disclosed is a method of measuring the radiation characteristic of an antenna, where sufficient power is secured within a short period of time and supplied in a stable manner so as to always keep the intensity of measurement signals high irrespective of the measurement frequency. With the antenna radiation measurement method, upon receipt of measurement frequency signals, location information and measured values are processed to transmit measurement signals, and a charging high frequency of several hundred megahertz (MHz) to several hundred gigahertz (GHz) is scanned toward a tester body such that inductive power is generated to allow the self-charging. The measurement frequency signals are transmitted toward the tester body through a source antenna, and the measured signals transmitted from the measurement antennas of the respective measurement modules are received and data-processed at a measurement controller.07-01-2010
20100238077System and Method for Receiving Antenna Measuring Signal and System for Measuring Antenna - The present invention relates to an apparatus and method for receiving an antenna measuring signal, and a system of measuring an antenna. In particular, the present invention relates to an apparatus and method for receiving an antenna measuring signal that can remove a measurement error caused by motion of an antenna cable, and a system for measuring an antenna. According to the apparatus and method for receiving an antenna measuring signal and the system and method for measuring an antenna according to the present invention, it is possible to remove a coupling effect of an RF cable of a receiving antenna side while measuring antenna characteristics, thereby minimizing a measurement error of the antenna.09-23-2010
20090219217ANTENNA-CHARACTERISTIC MEASURING APPARATUS AND ANTENNA-CHARACTERISTIC MEASURING METHOD - A measured antenna and a measuring antenna are placed inside a radio anechoic container. On the basis of an aperture size D of the measured antenna, an aperture size d of the measuring antenna, and a wavelength λ of a measurement frequency, a distance L between the measured antenna and the measuring antenna is set to a value in the range of (D+d)09-03-2009
20110084887SYSTEM FOR TESTING MULTI-ANTENNA DEVICES - A test system for testing multiple-input and multiple-output (MIMO) systems is provided. The test system may convey signals bidirectionally between two test chambers. Each test chamber may be lined with foam to minimize electromagnetic reflections. Each test chamber may include structure three-dimensional array of test antennas. The test antennas may be mounted in a sphere using an antenna mounting structure. The antenna mounting structure may include multiple rings of different sizes. Test antennas may be embedded in the inner walls of the antenna mounting structure. There may be multiple receiving antennas located in each test chamber. One test chamber may include a device under test inside an array of test antennas and another test chamber may include base station antennas inside another array of test antennas. Signals may be conveyed between the test chambers using channel emulators.04-14-2011
20100039334METHOD FOR MEASURING ANTENNA CHARACTERISTICS OUT OF OPERATIONAL FREQUENCY RANGE OF CHAMBER - There is provided to a method for measuring antenna characteristics operating in an out-of-operational frequency range of a chamber, in the chamber having a predetermined operational frequency range, including the steps of: a) measuring reflected wave characteristics of the out-of-operational frequency range generated within the chamber; b) measuring the characteristics of a measurement target antenna operating in the out-of-operational frequency range of the chamber; and c) measuring final characteristics of the measurement target antenna by compensating the characteristic data of the measurement target antenna measured in the step b) for reflected wave data measured in the step a).02-18-2010
20110102276MULTIDIMENSIONAL RF TEST FIXTURE AND METHOD FOR SECURING A WIRELESS DEVICE FOR RF TESTING - A system and method for testing RF characteristics of a wireless device. The wireless device is positioned in an x-position and a y-position of a horizontal plane of a test fixture. An RF antenna coupler is positioned in an x-position and a y-position of a vertical plane. The positioning of the wireless device and the RF antenna coupler correspond to acceptable RF characteristics for testing the wireless device. Positions of the wireless device and the RF antenna coupler are identified. The identified positions are utilized to perform subsequent testing of similar wireless devices.05-05-2011
20110102277Method and Device for Measuring a Radiation Field - A method for measuring a radiation field in the direct vicinity of a measured object is provided. One or more antenna measurement probe(s) are moved in any desired fashion within the radiation field, and a number of high-frequency measurement points is thus recorded. During the movement of the antenna measurement probe, a position determination of a respective antenna measurement probe is conducted simultaneously with or in close temporal proximity to the capture of a respective high-frequency measurement point, in order to assign a position to each high-frequency measurement point so as to generate a spatially defined measurement point cloud. Finally, radiation patterns at any distance from the measured object may be determined from the spatial measurement point cloud by means of a field transformation method.05-05-2011
20090027281Systems, Methods, and Apparatuses for Stray Voltage Detection - Systems, methods, and apparatuses may be provided for stray voltage detection. The systems, methods and apparatuses may include providing a first antenna at a first location relative to a monitored equipment or structure, where the first antenna may be operative to detect a first electric field strength at the first location, providing a second antenna at a second location relative to the monitored equipment or structure, where the second antenna may be operative to detect a second electric field strength at the second location, and detecting a stray voltage based at least in part upon the detected first electric field strength and the second electric field strength.01-29-2009
20110050515CALCULATING ANTENNA PERFORMANCE - A system and method for detecting the performance of a bi-polarized antenna including two antennas in a wireless communication system is provided. The system may include at least one directional coupler connected to the bi-polarized antenna configured to couple a transmitting signal of the first antenna and another signal from the bi-polarized antenna; a power detector connected to the at least one directional coupler and configured to measure the power of the transmitting signal and the another signal as analog results, respectively; an analog-digital converter connected to the power detector and configured to convert the analog results into digital results; and a processing unit connected to the analog-digital converter and configured to calculate the difference of the digital results. The performance of the bi-polarized antenna can be accessed by the above-measured polarization isolation.03-03-2011
20100039332Quasi-Compact Range - An antenna method includes using a reflector antenna to produce a test field within a test region at a quasi-compact range, which is within a near-field of the reflector antenna but further from an aperture plane of the reflector antenna than a compact range of the reflector antenna.02-18-2010
20100321257Microwave Ablation Antenna Radiation Detector - A radiation detector is disclosed. The radiation detector is disposed on a microwave antenna assembly. The radiation detector includes a receiving antenna adapted to receive microwave energy. The receiving antenna includes a first tubular antenna member and a second tubular antenna member disposed concentrically about a longitudinal axis defined by the microwave antenna assembly. The detector also includes at least one rectifier coupled to the receiving antenna adapted to rectify at least a portion of the microwave energy and a filter coupled to the at least one rectifier and adapted to convert the rectified microwave energy into a detection signal.12-23-2010
20080204334Broadcasting receiving apparatus08-28-2008
20110133999APPARATUS AND METHOD FOR MEASURING RADIATED POWER OF TERMINAL - An apparatus for measuring radiated power of a terminal includes: an enclosure including a pair of couplers configured to couple an electromagnetic field radiated from the terminal or a substitution antenna and a measurement jig configured to rotate the terminal or the substitution antenna, the terminal or the substitution antenna being supposed to be arranged between the pair of couplers, with reference to at least one of X, Y, and Z axes; a driver installed outside the enclosure to drive the measurement jig; a signal generator configured to generate a feed signal transferred to the substitution antenna when the substitution antenna is arranged on the measurement jig; a feed signal transmitter configured to transfer the feed signal generated by the signal generator to the substitution antenna; and a spectrum analyzer configured to measure power of a radiated signal radiated from the terminal or the substitution antenna.06-09-2011
20110134000APPARATUS AND METHOD FOR DETECTING RADIATED POWER - A radiated power detection apparatus including a reception antenna and a probe in a Fresnel zone determines a measurement parameter of a wireless communication device and coincides central points of an antenna that is included in the wireless communication device, the reception antenna, and the probe. Next, the radiated power detection apparatus measures the magnitude of an electric field corresponding to at least one measurement point while transferring the reception antenna and the probe according to a measurement parameter, calculates the magnitude of a maximum electric field in a far-field using the magnitude of an electric field, and thus detects radiated power of the wireless communication device based on the magnitude of a maximum electric field.06-09-2011
20100214182ANTENNA SYSTEM - An antenna system includes plural antennas. Each antenna is different than every other antenna. Each antenna is characterized by a principal plane. A principal plane of a first antenna is oblique to a principal plane of a second antenna. The first antenna includes a first insulating substrate extending in the principal plane of the first antenna. The first antenna further includes a first radiating element and a connected first conductor and includes a second radiating element and a connected second conductor. The first antenna further includes a coupling conductor coupling the second radiating element and the first conductor. The first antenna further includes a first coupler having a first signal conductor and a second signal conductor. The first signal conductor is coupled to the second conductor, and the second signal conductor is coupled to the first radiating element.08-26-2010
20100194650Antenna Weights Calculation Based on Users' Interference Rejection Capabilities - The present invention relates to a method and arrangement in a transmitter unit of a multi-antenna system for an improved calculating of the antenna weights for a beamforming transmission of data from a transmitter unit to a target receiver unit, whereby interfering signal components for receiving units other than the target receiving unit and the desired communication signal at a target receiving unit are weighted by receiver-specific parameters describing the receiver capabilities of said units in terms of their capability for interference suppression and/or signal enhancement. The invention also relates to a method and arrangement for scheduling of user equipments by using said information on the signal processing capabilities for received signals of each receiving unit.08-05-2010
20110148720NFC ANTENNA AIDED DESIGN SYSTEM AND DESIGN METHOD EMPLOYING THE SAME - An exemplary embodiment of near field communication antenna aided design system includes a testing antenna, a standard antenna, and a network analyzer. The standard antenna is resonantly coupled with the testing antenna and includes two feed points. The network analyzer is electrically connected to the feed points and sends a test signal to the standard antenna. The standard antenna receives the test signal and is resonantly coupled with the testing antenna to generate a corresponding insertion loss reference curve. The network analyzer tests the insertion loss values on the insertion loss reference curve to obtain the resonant frequencies of the testing antenna. A design method employing the near field communication antenna aided design system is also provided.06-23-2011
20120146861ANTENNA CHARACTERIZATION IN A WAVEGUIDE - A method for determining at least one characteristic of an antenna requiring: a) positioning an antenna in a space surrounded by a waveguide; b) feeding an electric excitation signal (u06-14-2012
20120038521Configurable common rerfernce signal port for reference signal received power in distributed antenna systems - A method of determining reference signal received power (RSRP) by user equipment (UE) associated with a distributed antenna system (DAS) may include detecting at least three different reference signals in one or more common reference signals (CRSs) that are associated with different antennas in the DAS. The method may also include determining at least three different RSRPs corresponding to the at least three different reference signals. The at least three different RSRPs may be level 3 filtered to produce at least three corresponding filtered powers. The UE may report a maximum of the at least three corresponding filtered powers to the distributed antenna system.02-16-2012
20100177000AUTOMATIC ANTENNA OPTIMIZATION SYSTEM - The claimed subject matter provides a system and/or a method that facilitates receiving a terrestrial broadcast service from a transmitter. An antenna steering component can automatically maneuver a directional antenna with a 360 degree azimuth sweep in order to collect information related to a signal quality for a channel and a corresponding transmitter. An antenna system controller can ascertain an antenna azimuth for the directional antenna for each channel based upon the collected information, wherein the antenna azimuth corresponds to a position of the directional antenna that receives a level of reception from the transmitter.07-15-2010
20110134001ANTENNA EVALUATION APPARATUS FOR EVALUATING MULTIPLE WAVE OF RADIO WAVES TRANSMITTED FROM SCATTERER ANTENNAS WITH FUNCTION OF CALIBRATION FOR THE SAME APPARATUS - A computer measures amplitudes and phases respective received signals S06-09-2011
20120038524Impedance Matching Method, Impedance Matching Apparatus For The Same, and Record Medium - Disclosed are an impedance matching method, an impedance matching apparatus for the same, and a record medium. The impedance matching apparatus includes an impedance matching part connected to an antenna to transmit/receive a radio wave and including at least one variable capacitor, a detector to detect transmit power and reflected power reflected by the antenna, and a controller to set a first searching region within a whole variation range of the variable capacitor, to detect an optimal impedance matching point within the first searching region by using at least one of the transmit power and the reflected power, and to set a next searching region about the optimal impedance matching point to search for a final impedance matching point within the whole variation range of the variable capacitor.02-16-2012
20120038523IMPEDANCE MATCHING METHOD, IMPEDANCE MATCHING APPARATUS FOR THE SAME, AND RECORD MEDIUM - Disclosed are an impedance matching method, an impedance matching apparatus for the same, and a record medium. The impedance matching apparatus includes a storage part to store information about an impedance matching point according a state of an obstacle, an impedance matching part connected to an antenna and including at least one variable element, a detector to detect transmit power and reflected power reflected by the antenna, and a controller to search for an impedance matching point within a variation range of the variable element by using at least one of the transmit power and the reflected power, and to detect a state of a surrounding obstacle by comparing information about the searched impedance matching point with the stored information about the impedance matching point.02-16-2012
20120038522ANTENNA CHARACTERISTIC MEASURING SYSTEM AND ANTENNA CHARACTERISTIC MEASURING METHOD - There is provided an antenna characteristic measuring system which includes a measuring point scanner to scan a measuring point, an antenna gain measuring device which measures an antenna gain of a measured antenna at a plurality of the measuring points, determines a reference point among the plurality of the measuring points, and obtains antenna gain difference values between the antenna gain at the reference point and each of the antenna gain at the plurality of the measuring points other than the reference point, and an antenna characteristic measuring device which measures a reference antenna characteristic of the measured antenna at the reference point and obtains an antenna characteristic of the measured antenna at each of the plurality of the measuring points other than the reference point by correcting the reference antenna characteristic with each of the difference values.02-16-2012
20110095950METHOD AND SYSTEM FOR TESTING THE RADIATION PERFORMANCE OF WIRELESS TERMINAL BASED ON DATA MODE - A method and system for the wireless terminal receiving sensitivity performance test based on a data mode are provided. The method comprises: building a human body model, in which the upper limb of the model holds the device under test at a predefined distance in front of the head of the model; taking the antenna of the device under test as the origin to build a spherical coordinate and selecting a testing point in the spherical coordinate; placing the model under the circumstance of a full-anechoic chamber; enabling the device under test to work in a data mode, and collecting the receiving power at the testing point in the spherical placement system using the testing antenna, so as to obtain the total power receiving sensitivity of the device under test. In this way, the performance influence on the mobile terminal from the human body coupling of the human being in a data mode can be actually reflected, the reality is high and the usage is easy.04-28-2011
20120062430Semiconductor Device - An object is to provide a semiconductor device capable of preventing an alternating leakage current from flowing into a voltage detection circuit. The semiconductor device includes an antenna circuit, a resonance frequency regulating circuit, a voltage detection circuit, and a first capacitor. The resonance frequency regulating circuit includes a second capacitor including one terminal electrically connected to a first terminal of the antenna circuit; and a transistor including a first terminal electrically connected to the other terminal of the second capacitor, a second terminal electrically connected to a second terminal of the antenna circuit, and a gate electrically connected to the first capacitor and the voltage detection circuit.03-15-2012
20120206305Testing of Automobile Mounted Antennas - A method and device provides for the testing and validation of a control module for receiving wireless data and communications utilizes a transmission line coupler mounted proximate the control module generates a signal that couples to an antenna of the control module. The control module produces a signal in response to coupling of the antenna with the signal produced by the transmission line coupler. The resulting signal is utilized to check, verify and validate operation of the control module.08-16-2012
20120154228METHODS FOR SIMULATING INTERNAL ANTENNAS IN TELEMETRY DEVICES - Systems and methods are described for simulating an internal antenna within a telemetry device. The simulator device includes a housing having at least one opening, wherein the housing is configured to accommodate close proximity placement of the telemetry device. The simulator device also includes a simulator or test antenna within the housing that corresponds to an internal antenna within a housing of the telemetry device. The simulator device further includes a radio frequency (RF) connector coupled to the simulator housing, for connection to a communication device. The simulator device also includes a fastening mechanism to secure the simulator device over the telemetry device so that the simulator antenna is adjacent to the internal antenna. The proximity of the simulator antenna to the internal antenna provides simulator device RF characteristics that simulate internal antenna RF characteristics.06-21-2012
20100103059TUNED DIRECTIONAL ANTENNAS - A technique for improving radio coverage involves using interdependently tuned directional antennas. An example according to the technique is a substrate including two antennas, a transceiver, and a connector. Another example system according to the technique is a wireless access point (AP) including a processor, memory, a communication port, and a PCB comprising a plurality of directional antennas and a radio. An example method according to the technique involves determining a voltage standing wave ratio (VSWR) and interdependently tuning a first and second directional antenna to reach an expected radiation pattern.04-29-2010
20120154227Embedded Optical Waveguide Feed Structure For Radio Frequency Antenna Arrays - A feed structure for a radio frequency antenna, comprising: a plurality of radio frequency antenna elements; and a plurality of detectors, each one of the detectors being coupled to a corresponding one of the radio frequency antenna elements. Each one of the detectors is responsive to optical frequency energy to produce input radio frequency power for the corresponding one of the antenna elements coupled to said one of the detectors.06-21-2012
20090066592SYSTEM FOR INSPECTING ELECTROMAGNETIC COUPLING MODULES AND RADIO IC DEVICES AND METHOD FOR MANUFACTURING ELECTROMAGNETIC COUPLING MODULES AND RADIO IC DEVICES USING THE SYSTEM - A system for inspecting an electromagnetic coupling module includes a radio IC chip and a feeder circuit board on which the radio IC chip is mounted, the feeder circuit board includes a feeder circuit including an inductance element. This inspecting system measures the electromagnetic coupling module by electromagnetically coupling a probe of a measuring device to the electromagnetic coupling module by at least one of electrostatic coupling and electromagnetic coupling. In addition, the electromagnetic coupling modules are manufactured using this inspecting system.03-12-2009
20110102275RF TEST FIXTURE AND METHOD FOR SECURING A WIRELESS DEVICE FOR RF TESTING - A system and method for testing RF characteristics of a wireless device. The wireless device is placed on a base plate of a test fixture. One or more guides are positioned for securing the wireless device. At least one RF antenna is positioned. The position of the wireless device and the at least one RF antenna coupler relative to each other corresponds to acceptable RF characteristics for testing the wireless device. Positions of the one or more guides and the RF antenna coupler are identified. The identified positions are utilized to subsequently test similar wireless devices.05-05-2011
20120119960Waveguide radiating element of an antenna suitable to operate in the Wi-Fi band, and system for measuring the performances of an antenna operating in the C band and using such a radiating element - Structures and methods for a tunable waveguide radiating element are disclosed. The waveguide radiating element comprises a rectangular tube, which includes partially filled dielectric slabs that are disposed on parallel planes and incident on a lower edge of the element's mouth. The faces of each slab are engraved with a number of concentric SRR squares that present a gap on one of its sides. The distance between any two consecutive slabs may vary. The gaps of the outmost square may be arranged in such a way that, on the facing sides of two adjacent slabs, the gaps are rotated with respect to each other.05-17-2012
20120127046Method For Estimating The Polarization Ellipticity Of An Antenna Response Signal To An Incident Electromagnetic Wave - A method is provided for estimating the polarization ellipticity of an antenna response signal to an incident electromagnetic wave received on a crossed-loop antenna or an Adcock antenna array. The method comprises at least the following steps: measuring the phase offset Δφ between the signals acquired respectively on the cosine and sine path of the antenna; measuring the ratio R between the amplitudes of the signals acquired respectively on the cosine and sine path of the antenna; determining the ellipticity angle τ based on the phase offset Δφ and on the ratio R. The invention applies notably to the discrimination of ionospheric waves from ground and/or sea waves, in particular for a surveillance, eavesdropping, or goniometry system using HF band signals.05-24-2012
20100207827Apparatus and Method for Measuring Antenna Radiation Patterns - An antenna radiation pattern measurement device that measures a radiation pattern of an AUT by using a source antenna includes a control unit, an analysis unit, and a measurement unit. The control unit controls driving of the source antenna and the AUT. The analysis unit measures an electric field value from a radio frequency (RF) signal that is transmitted from one of the source antenna and the AUT and received by the other antenna. In addition, the measurement unit controls the control unit and the analysis unit and measures a radiation pattern of the AUT by using the electric field value.08-19-2010
20080204333Device for checking energy received by an antenna for preventing data corruption during a write operation in a non volatile transponder memory - A transponder circuit includes an antenna (08-28-2008
20090021434METHOD OF CONTROLLING ANTENNA OF MOVING OBJECT AND SYSTEM USING THE SAME - A system of controlling an antenna of a moving object is provided. The system includes: a plurality of communication antennas established in the moving object; an environmental information generation unit generating environmental information which includes strength information of a received signal and moving speed information of the moving object; an antenna use determination unit determining, with respect to the plurality of communication antennas, a number of antennas for each use based on the environmental information; and an antenna assigning unit assigning the plurality of communication antennas for each use according to the determined number of antennas.01-22-2009
20110122032ANTENNA EVALUATION APPARATUS AND ANTENNA EVALUATION METHOD FOR CREATING DIFFERENT SETS OF MULTIPATH WAVES AROUND RECEIVING ANTENNA - An antenna evaluation apparatus includes receiving antennas to be evaluated, scatterer antennas surrounding the receiving antennas, a signal generator, a divider, a phase-shift circuit, and a computer. The computer generates first and second initial phase vectors each corresponding to a different set of multipath waves, determines a third initial phase vector including arbitrary initial phases each between a pair of corresponding initial phases in the first and second initial phase vectors, adjusts the phases of the radio frequency signals using the phase-shift circuit such that the phases of the radio frequency signals have corresponding initial phases in the third initial phase vector, and makes the adjusted radio frequency signals radiate.05-26-2011
20080297423Method for Measuring Inverse Scattering Wave, and Apparatus for Identifying Inferior Rfid Transponder and Reader Using the Same - Provided is a method for measuring inverse scattering wave, which includes installing a scattering object which is a test object in a coupler, feeding an electrical signal to an input terminal of the coupler, terminating an output terminal and an isolation terminal of the coupler so that the electrical signal scattered by colliding with the scattering object is transmitted to a coupling terminal of the coupler, and measuring intensity of the electrical signal transmitted to the coupling terminal. In addition, provided is an apparatus for identifying an inferior Radio Frequency IDentification (RFID) transponder and an inferior RFID reader by using the method for measuring the inverse scattering wave. Accordingly, the installation cost thereof is reduced. Furthermore, the facilities for the measurement can be installed in a narrow space, and the measurement can be done regardless of an external electromagnetic wave environment. Moreover, the apparatus for identifying the inferior RFID transponder and reader is installed on a production line, thereby removing the inferior RFID transponder and reader directly from the production line during the mass production.12-04-2008
20120326933APPARATUS FOR MEASURING THE STRENGTH OF AN ELECTROMAGNETIC FIELD - There is disclosed an apparatus for measuring the strength of an electromagnetic field. The apparatus comprises a plurality of antennas arranged such that the field is received from all directions, each antenna supplying an RF signal as output. The apparatus also comprises a plurality of transforming modules, each of said modules being fed with the RF signal supplied by one of the antennas, each of said modules transforming the impedance of the RF signal it receives as input, so as to supply another RF signal as output. The apparatus also comprises a plurality of converting modules, each of said modules being fed with the RF signal supplied by one of the transforming modules, each of said modules converting the RF signal it receives as input into a DC current it supplies as output, said DC current varying substantially as a logarithmic function of the said RF signal.12-27-2012
20130009830Antenna Verification Via Transmitter - Devices, systems, and methods are disclosed which relate to verifying an antenna via a transmitter. A logical interface coupled to a transmitter reads antenna specifications from a memory integrated with an antenna, and refuses transmission when the antenna attributes conflict with the requirements of the transmitter.01-10-2013
20130016018AUTOMATIC ELECTRONICALLY TUNED ELECTRICALLY SMALL TRANSMITTING ANTENNA SYSTEMAANM Ham; Ronald EdgarAACI AustinAAST TXAACO USAAGP Ham; Ronald Edgar Austin TX US - In an automatic tuning system for a loop antenna having a single electronically variable reactance element, the reactive component sense of the antenna impedance is determined over a wide range of frequency. The electronically variable reactance component of the antenna is automatically minimized by a feedback loop driving a voltage variable capacitance until the reactive component of the antenna impedance is virtually zero and the antenna impedance is hence resistive. The adjustment of the electronically variable capacitance is by a variable high voltage power supply controlled by a feedback amplifier or by a high voltage feedback amplifier.01-17-2013
20080246669Cold Noise Source System - In one embodiment, a system includes a first cold noise source, a first radiometer receiver, and a first detector. The first cold noise source generates a first thermal radiation signal having a first carrier frequency band. The first thermal radiation signal carries a first information signal. The first cold noise source also transmits the first thermal radiation signal through a first antenna. The first radiometer receiver receives the first thermal radiation signal through a second antenna, and the first detector extracts the first information signal from the first thermal radiation signal.10-09-2008
20090267846Electromagnetic Field Power Density Monitoring System and Methods - Systems and methods for monitoring electromagnetic field power density are disclosed. The system includes a broadband antenna configured to convert a plurality of electromagnetic waves at a plurality of frequencies into a broadband signal. The system also includes a power adjustment system configured to passively selectively attenuate the broadband signal to provide a filtered output signal for a predetermined range of frequencies. The system further includes an output system configured provide an indicator to an end-user of the system if the filtered output signal exceeds a predetermined threshold level that characterizes a predetermined electromagnetic power density threshold.10-29-2009
20120249381RADIO FREQUENCY PRINTED CIRCUIT BOARD - A radio frequency(RF) printed circuit board (PCB) includes an RF circuit for generating high frequency signals. The RF PCB is connected to an EMC measuring device when measuring the EMC thereof. The measuring device includes a probe pin and a shielding barrel surrounding the probe pin. The shielding barrel includes an end surface at a distal end thereof. The RF PCB further includes a test node connected to the RF circuit and a ground node surrounding the test node. The test node contacts the probe pin and outputs the high frequency signals when measuring the EMC of the RF PCB. The ground node corresponds to the end surface and contacts the end surface while the probe pin contacts the test node.10-04-2012
20130135159ADAPTOR FOR A SURFACE-MOUNTABLE ANTENNA WITH WAVEGUIDE CONNECTOR FUNCTION AND ARRANGEMENT COMPRISING THE ANTENNA DEVICE - An adaptor with a lower portion designed to be connectable to an upper horizontal opening serving as electromagnetic aperture of a reflector frame of a surface-mountable antenna device and an upper portion of the adaptor being designed to accommodate a waveguide of testing or tuning equipment.05-30-2013
20130127675ELECTROMAGNETIC WAVE SENSOR AND A METHOD FOR FABRICATING IT - A sensor for measuring electromagnetic power in a dielectric waveguide structure includes an antenna element for detecting heating caused by electromagnetic power absorbed into the antenna element. A membrane forming at least partially a thermally insulating layer is implemented on a surface of the dielectric waveguide structure being a substrate for the sensor. The antenna element is implemented on a surface of the membrane and the antenna element is at least partially thermally insulated with a cavity from the substrate. A method for fabricating the sensor is also described.05-23-2013
20100019977ANTENNA TEST APPARATUS - In an antenna test apparatus of the type having a platform for carrying an antenna for test and a pressure board vertically movable by a lifter to hold down a test antenna in the platform for test, the platform has a top flange formed of an electromagnetic wave absorbing material and raised around the periphery, and the pressure board has a bottom flange formed of an electromagnetic wave absorbing material for stopping against the top flange of the platform to protect an antenna to be tested in between the platform and a bottom soft flange of the pressure board against external electromagnetic noises.01-28-2010
20130141287Apparatus for Measuring a Radiation Pattern of an Active Antenna Arrangement - An apparatus for measuring a radiation pattern of an active antenna arrangement is provided, where the active antenna arrangement includes one or more radios having dedicated antenna elements in communication with each other. The apparatus has a common module external to the active antenna arrangement and a calibration radio, which is also external to the active antenna arrangement and coupled to the common module. The common module includes a transmit/receive unit and interfacing means for interfacing the common module with the active antenna arrangement, with the calibration radio and with a network node. The common module further includes a measurement device for measuring signals received from the active antenna arrangement.06-06-2013
20080204332ON-VEHICLE DEVICE - An on-vehicle device has a receiving antenna for receiving a radio signal from a mobile device, a receiving circuit for returning an electric signal obtained by conversion by the receiving antenna to the original state, a control unit for determining the correct/incorrect of a received signal from the receiving circuit, a driving circuit that is driven in response to a driving signal from the control unit and supplies antenna current to a vehicle antenna, and a detector for detecting whether the vehicle antenna operates normally. A detection signal of the detector is fed back to the control unit through the receiving circuit, and the failure determination of the vehicle antenna is performed.08-28-2008
20130154887ANTENNA TESTING ENCLOSURES AND METHODS FOR TESTING ANTENNA SYSTEMS THEREWITH - Antenna enclosure apparatus are provided that may be used to verify the signal path integrity, amplitude and/or phase of a single antenna or multiple antennas of direction finding (DF) antenna array and associated electronics without interference of external signals such as ground interference signals present when an aircraft-based antenna is tested on the ground. An individual antenna test enclosure may in one embodiment be provided as an antenna hood having a cavity dimensioned for internally receiving an antenna, such as an aircraft external blade antenna. The cavity of the antenna enclosure may be lined with a RF absorbing material inside the enclosure to allow for RF path testing with substantially no “ringing”, so that accurate phase and gain testing of a received antenna and its RF signal path may be accomplished.06-20-2013
20110298674ELECTRONIC DEVICE WITH ANTENNA SWITCH AND ANTENNA SWITCHING METHOD THEREOF - An electronic device with antenna switch comprises a first antenna, a first proximity sensor, a second antenna, a detection module, a determination module and a control module. The first proximity sensor is located with the first antenna at a first side portion of the electronic device. The detection module detects an approach signal from the first proximity sensor. The determination module determines whether the strength of the approach signal is stronger than a threshold value in real time. The control module initiate the second antenna to receive signals through the switch if the strength of the approach signal is stronger then the strength of the threshold value.12-08-2011
20130187814Scanning Measurements On Generalized Grids - A scanning measurement apparatus and method comprising a device under test for receiving or transmitting a signal, a measurement probe, a robot for moving the device or the probe relative to one another to scan continuously over a two-dimensional planar, cylindrical or spherical surface in a three-dimensional space, and a controller for obtaining measurement samples at generalized grid points on the two-dimensional surface computing characteristic coefficients from the measured values, wherein the characteristic coefficients are recovered using a conjugate gradient method, using in part an unequally spaced fast Fourier transform or using a conjugate gradient method and an unequally spaced fast Fourier transform.07-25-2013
20130187815METHOD AND DEVICE FOR ELECTROMAGNETICALLY TESTING AN OBJECT - The invention relates to a method for electromagnetic testing of an object, a method in which electromagnetic radiation is sent by a probe (07-25-2013
20080303725Antenna Coupler - What is described is an antenna coupler for testing of wireless devices, said coupler comprising an antenna element for wireless communication with the wireless device and an accommodating element for holding the wireless device, wherein the accommodating element can be fastened in various positions relative to the antenna element by a fastening means. As an alternative or in addition, a releasable displacement of the antenna element may also be effected. In one embodiment, the fastening means is a slider, which is displaceable along the housing of the antenna coupler and carries the holder.12-11-2008
20120001810METHOD AND DEVICE FOR CALIBRATING AN ARRAY ANTENNA - A method for calibrating an array antenna having a plurality of branches includes generating a test signal using a pseudo-random sequence assigned to one of the plurality of branches for each of the plurality of branches; adding the test signals to a useful signal of the antenna so as to form a summed signal emitted via the array antenna; receiving the summed signal with a receiver antenna; correlating the received summed signal with a replica of the pseudo-random sequence so as to produce a correlation result; estimating a characteristic of one of the plurality of branches by processing the correlation result; and calibrating the antenna based on the estimated characteristic.01-05-2012
20130194139ELECTRONIC DEVICE WITH CALIBRATED TUNABLE ANTENNA - An electronic device may have tunable antenna structures. A tunable antenna may have an antenna resonating element and an antenna ground. An adjustable electronic component such as an adjustable capacitor, adjustable inductor, or adjustable phase-shift element may be used in tuning the antenna. An impedance matching circuit may be coupled between the tunable antenna and a radio-frequency transceiver. The adjustable electronic component may be coupled to the antenna resonating element or other structures in the antenna or may form part of the impedance matching circuit, a transmission line, a parasitic antenna element, or other antenna structures. During manufacturing, manufacturing variations may cause the performance of the tunable antenna to deviate from desired specifications. Calibration operations may be performed to identify compensating adjustments to be made with the adjustable electronic component. Calibration data for the adjustable component may be stored in control circuitry in the electronic device.08-01-2013
20120086612SYSTEMS AND METHODS OF TESTING ACTIVE DIGITAL RADIO ANTENNAS - Systems and methods of testing active digital radio antennas are presented. Systems and methods can test the active digital radio antenna functioning as both a radio and as an antenna and can test both the transmit and receive performance of the antenna. An electromagnetic probe can scan the antenna to perform the testing and couple to the elements of the antenna using radio frequency signals propagated in the air, as opposed to direct cabling.04-12-2012
20120086611COMMUNICATION DEVICE AND CONTROL METHOD - A first adjustment circuit adjusts an impedance of a first antenna, and a second adjustment circuit adjusts an impedance of a second antenna. A coupling reduction circuit reduces an amount of coupling of the first and second antennas. A first reception power measurement unit measures first reception power received from the first antenna, and a second reception power measurement unit measures second reception power received from the second antenna. A selection unit selects a circuit from among the first adjustment circuit, the second adjustment circuit, and the coupling reduction circuit. A circuit control unit controls the impedance of the selected circuit so that the value of the evaluation function proportional to the product of the first reception power and the second reception power becomes larger.04-12-2012

Patent applications in class Measuring signal energy