Patent application number | Description | Published |
20080297426 | Antenna System for Tracking Mobile Satellite and Carrier Having the Same - Provided is a antenna system for tracking a mobile satellite and a movable carrier having the same for mechanically adjusting the orientation of an antenna at the azimuth angle and the elevation angle and correcting the phase error of a receiving signal while adjusting the elevation angle of the antenna at the same time. The antenna system for tracking a mobile satellite includes: a substrate; a rotating plate rotatably disposed on the substrate; one or more antennas disposed at the rotating plate; an azimuth angle adjusting unit for mechanically adjusting an azimuth angle of the antenna; and an elevation angle adjusting unit for mechanically adjusting an elevation angle of the antenna. | 12-04-2008 |
20080297427 | Antenna System for Tracking Satellite - Provided is an antenna system for tracking a satellite which includes a fixed body and a rotating body. The antenna system includes a transmitting/receiving unit having a transmitting channel and a receiving channel for signal power, a driving unit for enabling mechanical motion of the rotating body for satellite tracking, and a control unit for monitoring and controlling the operation of the driving unit. Accordingly, the various kinds of the components of the antenna system mounted and operated on the movable body can be minimized and the output of the transmitted signal required in the antenna system can be simply replaced, thereby simplifying the configuration of the system and reducing the production cost of the system. In addition, the STR having the tracking signal processing function in the digital mode as well as the general analog mode is mounted on the antenna system, thereby improving accuracy of satellite tracking. Moreover, the posture of the antenna system can be stably maintained regardless of the motion of the movable body in the moving environment by using the driving unit and the control unit which are designed for stably controlling the elevation, azimuth and antenna rotating angle, thereby improving communication performance that is the intrinsic object of the antenna system. | 12-04-2008 |
20090012768 | METHOD FOR DECIDING ARRAY SPACING OF ARRAY ANTENNA BY USING GENETIC ALGORITHM AND ARRAY ANTENNA HAVING SOFA STRUCTURE WITH IRREGULAR ARRAY SPACING - A method for determining an array space of an array antenna by using a genetic algorithm and an array antenna having a soft structure with irregular array spacing are disclosed. The array antenna having a sofa structure with irregular array spacing, includes: a plurality of radiation elements having an inclined angle based on a horizontal plane and arranged with irregular array spacing for radiating and receiving an radio wave; a plurality of phase shifters for amplifying radiation signals radiated from the plurality of radiation elements and receiving signals received from the plurality of radiation elements, and controlling phases of the radiation signals and the receiving signals; and a radio wave signal coupler for dividing a transmitting signal to the radiation signals, transferring the divided radiation signals to the plurality of phase shifters and coupling the receiving signals from the plurality of phase shifters. | 01-08-2009 |
20090102730 | APPARATUS 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 |
20090154409 | METHOD FOR EVALUATING SPECTRUM UTILIZATION EFFICIENCY IN RADIO SYSTEM SHARING FREQUENCY - Provided is a method for evaluating spectrum utilization efficiency in a radio system sharing frequency. The method for evaluating spectrum utilization efficiency of a frequency sharing radio system in a radio environment having a first radio system using at least one specific frequency in an allocated frequency band and a second radio system sharing the frequency band allocated by the first radio system, includes calculating net coverage per unit area based on a design parameter on the first radio system and a design parameter on the second radio system; and evaluating spectrum utilization efficiency based on the calculated net coverage per unit area. | 06-18-2009 |
20090219116 | Cable to waveguide transition apparatus having signal accumulation form of backshort and active phase shifting using the same - A cable to waveguide transition apparatus having a signal accumulation form of a backshort is disclosed. The cable to waveguide transition apparatus having a signal accumulation form of a backshort, includes: a waveguide; a RF probe for transferring a radio frequency (RF) signal to the waveguide; and a backshort having the signal accumulation form for reflecting the RF signal excited from the RF probe, wherein the backshort reflects a first fundamental frequency signal excited from the RF probe to have a phase identical to a phase of a second fundamental frequency signal excited from the RF probe to an aperture of the waveguide, and reflects a first 2-order harmonic frequency signal excited from the RF probe to have a phase reverse to a phase of a second 2-order harmonic frequency signal excited to an aperture of the waveguide in order to eliminate the 2-order harmonic frequency signal. | 09-03-2009 |
20090322633 | SMALL MONOPOLE ANTENNA HAVING LOOP ELEMENT INCLUDED FEEDER - Provided is a small monopole antenna having a loop feeder. The small monopole antenna having a loop feeder includes: a loop element forming a loop along a predetermined plane and having a loop feeder at the center thereof; a non-feeding type monopole antenna element including one end connected to a wire of the loop element and other end connected to a ground unit by being bended at the center of the loop element; a ground unit for grounding other end of the non-feeding type monopole antenna; and a first connecting unit for connecting the non-feeding type monopole antenna to an external device for feeding the loop feeder of the loop element through the non-feeding type monopole antenna. | 12-31-2009 |
20090322634 | LOOP ANTENNA - Provided is a loop antenna. The loop antenna includes a first antenna element embodied as a coaxial cable, a second antenna element embodied as a line and connected to one end of the first antenna element in series, a third antenna eLement embodied as a line, having one end connected to a ground plane and the other end connected to the other end of the first antenna element in series, and a power feeding cable for supplying power to the second antenna element. | 12-31-2009 |
20100039334 | METHOD 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 |
20100109957 | APPARATUS 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 |
20100111017 | METHOD AND APPARATUS OF GENERATING SIGNALS FOR INITIAL RANGING IN OFDMA SYSTEM - Provided is a method and apparatus of generating signals for initial ranging in an Orthogonal Frequency Division Multiple Access (OFDMA) system. The method, includes: generating a plurality of ranging symbols by cyclic-shifting sample data of a ranging symbol in one OFDMA symbol period as much as a value obtained by multiplying a cyclic prefix size by a symbol index; generating a ranging signal by copying a rear part corresponding to the cyclic prefix size in the sample data with respect to each of the ranging symbols and inserting the copied rear part in front of the sample data as a cyclic prefix. | 05-06-2010 |
20100177645 | METHOD FOR MANAGING MULTIPLE FREQUENCY ASSIGNMENT USING TERMINAL'S RECEIVED PERFORMANCE IN OFDMA WRAN SYSTEM - There is a provided a method for managing a multiple frequency assignment using a terminal's RX performance in an orthogonal frequency division multiple access (OFDMA) wireless regional area network (WRAN) system, including: a) measuring a bit energy/noise power spectral density (Eb/No) and a received signal strength indicator (RSSI) which are received in the terminal; b) informing the measured Eb/No and RSSI of a base station; c) calculating a round trip delay (RTD) in the base station; d) determining a terminal performance level based on the measured Eb/No, RSSI and the calculated RTD; and e) determining a frequency channel and modulation scheme based on the determined performance level. | 07-15-2010 |
20100286953 | PATH LOSS CALCULATION METHOD USING REFLECTION PATH AS DOMINANT PATH - Provided is a method for calculating a path loss using reflection paths as dominant paths. The method includes determining a reflection plane and a reflection point in case of reflection; calculating electric field strength for the determined reflection plane and reflection point; calculating electric field strength based on a statistical loss value by diffraction according to a propagation environment in case of diffraction; and calculating a path loss based on the calculated electric field strength for reflection and the calculated electric field strength for diffraction. | 11-11-2010 |