Patent application number | Description | Published |
20080204337 | PORTABLE ANTENNA DEVICE - A portable antenna device includes a circuit board having a ground pattern, an antenna including a spirally wound external element and a spirally wound internal element coaxially disposed inside the external element at a distance from the first element so that one of the external and internal elements forms a signal wire and the other forms a ground wire. The circuit board includes plural passive elements each of which has a different impedance and a switch unit that selectively connects the antenna with the ground via one of the passive elements to provide a resonance characteristic of radio wave that has a frequency deference from a resonance characteristic provided by any other passive element. | 08-28-2008 |
20080224945 | ANTENNA APPARATUS - An antenna apparatus includes a substrate having a GND pattern land and an electric power feed pattern land on a same surface, an outer element extending away from the land in a spiral shape, and an inner element extending along an axis of the outer element in a spiral shape with a space interposed between itself and the outer element. The outer element and the inner element of the antenna apparatus respectively serve as one of a signal line and a GND line, and are supported by a retainer member to have predetermined relationship on a land formation surface. The retainer member is made of dielectric body, and the two elements respectively have a surface mount portion at one end that is to be fixed onto the substrate with electrical connection to corresponding lands. The surface mount portions are formed substantially parallel to the land formation surface. | 09-18-2008 |
20080232431 | Electronic key system and method - An in-vehicle LF transmitter transmits a synchronization signal to an in-vehicle RF receiver and transmits LF data (response request) including a synchronization signal to a portable device. The portable device performs RF data output and DSSS process and transmits RF data (response) subjected to spread process. The in-vehicle RF receiver receives the RF data and performs despread process. Both of the spread process of the portable device and the despread process of the in-vehicle RF receiver are performed by the use of a spread code the period of which is adjusted based on the synchronization signal transmitted from the in-vehicle LF transmitter. | 09-25-2008 |
20090145217 | TRIGGER UNIT MOUNTING STRUCTURE FOR WHEEL POSITION DETECTION SYSTEM - A first trigger unit and a second trigger unit output trigger signals to transceivers disposed for the four wheels of a vehicle. The first and second trigger units are attached to wall surfaces of tire housings corresponding to the left front and left rear wheels respectively. Each of the first and second trigger units is arranged in a position of the wall surface having an angle from 5 to 25 degrees with respect to the side of the corresponding wheel. Transceivers attached to a right front and right rear wheels are thus located farther from the trigger units than the left front and left rear wheels, respectively. Such arrangement allows the transceivers attached to the right front and right rear wheels to receive the outputted trigger signals with sufficient accuracy due to high field strength. | 06-11-2009 |
20090207892 | Receiving device for spread spectrum communication - A receiving device for spread spectrum communication includes a phase determining unit and a data demodulating unit. The receiving device receives a signal spread and modulated with first spreading code. The phase determining unit calculates a cross correlation between the received signal and a second spreading code and determines a phase P(0) of the received signal based on the cross correlation. The data demodulating unit synchronizes the phase P (0) and the first spreading code and despreads and demodulates the received signal with the first spreading code. The number of components in each of the first spreading code and the second spreading code is an integer greater than or equal to 2. | 08-20-2009 |
20090303152 | ANTENNA APPARATUS - An antenna apparatus includes an antenna and a support member. The antenna has (i) an outer element, which has a spiral section prolonged spirally in an axial direction, and (ii) an inner element, which has a spiral section prolonged spirally in the axial direction and is surrounded with an interval space by the outer element. The antenna is a terminal open type in which one of the two elements is used as a signal line and the other is used as a GND line. The support member includes a dielectric member and contacts each of the spiral sections of the outer and inner elements while supporting the outer and inner elements in a predetermined positional relationship. Further, the number of turns of the spiral section in the inner element is equal to or less than the number of turns of the spiral section in the outer element. | 12-10-2009 |
20090303153 | ANTENNA APPARATUS - An antenna apparatus includes an antenna and support member. The antenna has a double spiral structure to include (i) an outer element, which has a spiral section prolonged spirally in an axial direction, and (ii) an inner element, which has a spiral section prolonged spirally in the axial direction and is surrounded with an interval space by the outer element. The support member is made of dielectrics and holds the two elements in a predetermined positional relationship by contacting the spiral sections of the two elements. The support member contacts the spiral sections wholly along the prolonged direction. One of the two elements is connected with a high frequency wave source at one end portion along the axial direction while the other is connected with the high frequency wave source at the other end portion along the axial direction. The antenna functions as a terminal short circuit type. | 12-10-2009 |
20090323772 | WIRELESS COMMUNICATION SYSTEM - In a wireless communication system, a portable device and an in-vehicle device wirelessly communicate with each other by a spread spectrum method. The in-vehicle device transmits a synchronization signal indicative of a reference period to the portable device. The in-vehicle device performs code acquisition for only a portion of a spread wireless signal received from the portable device. The portion has a starting point in a search period from a search start point to a search end point. The search start point is identified based on the reference period and a predetermined first correction time. The search end point is identified based on the reference period and a predetermined second correction time. | 12-31-2009 |
20100003940 | RADIO SIGNAL RECEIVER DEVICE - A radio signal detector includes first and second detector circuits. The first detector circuit has a higher detection sensitivity to detect a radio signal earlier than the second detector circuit. The second detector circuit has a lower detection sensitivity to detect the radio signal accurately. When the second detector circuit detects the radio signal, it starts up a microcomputer. When the first detector circuit detects the radio signal, a time counter starts to count time. After being started up, the microcomputer acquires a time difference between the radio signal detection by the first detector circuit and the start-up. The microcomputer determines time of radio signal transmission by a radio signal transmitter device based on the determined time difference, and outputs control information after an elapse of a predetermined time. | 01-07-2010 |
20100182209 | Helical antenna and in-vehicle antenna including the helical antenna - A helical antenna includes a ground plate, a first helical portion spirally wound perpendicular to the plate, a second helical portion spirally wound perpendicular to the plate and surrounding the first helical portion radially outward of the first helical portion, and a feeder circuit. The circuit includes an oscillator, a divider connected to the oscillator, a first phase shifter connected between a first output terminal of the divider and a feeding point of the first helical portion, and a second phase shifter connected between a second output terminal of the divider and a feeding point of the second helical portion. Length of one turn of the first helical portion is equal to a result of multiplication of a wavelength of oscillation of the oscillator by N. Length of one turn of the second helical portion is equal to a result of multiplication of the wavelength by M (M>N). | 07-22-2010 |
20100232478 | Receiver for spread spectrum communication - A receiver for spread spectrum communication includes a receiver for receiving a wireless signal, a demodulator for demodulating the wireless signal into a spread spectrum signal, a correlation value calculator for calculating a correlation value between the spread spectrum signal and a spreading code having a predetermined number of chips, a synchronization detector for detecting a synchronization point between the spread spectrum signal and the spread signal based on the correlation value, a despreading device for despreading the spread spectrum signal based on the synchronization point, a noise level detector for detecting a noise level of the wireless signal, and a code number setting device for determining the number of chips of the spreading code in such a manner that there is a positive correlation between the noise level and the number of code portions. | 09-16-2010 |
20100245192 | Antenna apparatus - An antenna apparatus includes: a ground substrate; and a loop antenna having first and second polarized wave surfaces, which are perpendicular to the substrate. The substrate provides an antenna, which is excited and vibrated together with the loop antenna. The antenna has a first polarized wave component in parallel to the first polarized wave surface and a second polarized wave component in parallel to the second polarized wave surface. A polarized wave ratio between the first polarized wave component and the second polarized wave component in the substrate is substantially equal to a polarized wave ratio between the first polarized wave surface and the second polarized wave surface in the loop antenna. | 09-30-2010 |
20110128995 | Wireless communication system - In a wireless communication system, a portable device transmits a first signal spread based on a reference period indicated by a synchronization signal transmitted from an in-vehicle device and transmits a second signal spread based on an operation by a user. The in-vehicle device sets a search period based on a variation range in a delay time from when the synchronization signal is transmitted to when the spread first signal is transmitted and sets a residual period that starts at an ending point of the search period and ends at an ending point of the reference period when a starting point of the reference period is set at a starting point of the search period. When the in-vehicle device fails in a synchronous acquisition for the search period, the in-vehicle device performs a synchronous acquisition process for the residual period. | 06-02-2011 |
20110215983 | Antenna device including helical antenna - In an antenna device, a first helical part of a first antenna and a second helical part of a second antenna is disposed in a dielectric body on a ground plane. Each helical part is helically wound up in a direction perpendicular to the ground plane and includes a plurality of one-turn portions. Each one-turn portion of the first helical part has a peripheral length of M times a wavelength λ of use, where M is a positive natural number. One of the one-turn portions of the second helical part closest to the ground plane has a peripheral length Ks that is N times the wavelength λ of use, where N is a positive natural number greater than M. One of the one-turn portions of the second helical part farthest away from the ground plane has a peripheral length Ke, and (M·λ)09-08-2011 | |
20120293302 | IN-VEHICLE APPARATUS CONTROL SYSTEM - An onboard apparatus control system is disclosed. The onboard apparatus control system includes a portable apparatus and an in-vehicle apparatus which controls an onboard apparatus according to position of the portable apparatus. From multiple transmitting antennae, the in-vehicle apparatus transmits pulse pattern signals with different transmission frequencies at an overlapping timing, so that the pulse pattern signals are radio waves whose intensities are changed stepwise according to different patterns. The portable apparatus receives the radio waves transmitted from the multiple transmitting antennae. The position of the portable apparatus with respect to the vehicle is determined based on a combined pattern of the received pulse pattern signals, which a receiving unit is to receive at location with respect to the vehicle. | 11-22-2012 |
20130035042 | WIRELESS COMMUNICATION SYSTEM AND MANUFACTURING METHOD OF SAME - A wireless communication system has an in-vehicle system disposed in a vehicle and a portable device carried by a user, where the in-vehicle system and the portable device are communicably coupled. The in-vehicle system uses a transmitter for transmitting a request signal to the portable device in LF wave band, and the transmitter includes: a spread process unit for spread-modulating predetermined LF data by a spread spectrum method and for generating a spread data signal; and a modulation driver unit for converting the spread data signal to a modulation signal in the LF wave band and for outputting such modulation signal as a request signal to an antenna after amplifying the modulation signal. | 02-07-2013 |
20130169421 | POWER LINE COMMUNICATION SYSTEM - A vehicular power line communication system includes a looped twisted pair wire, a master, and a slave. The master outputs a high-frequency signal to the twisted pair wire to transmit power and a signal. The slave includes a looped aperture antenna that receives high-frequency power of the twisted pair wire and a received power measurement portion that monitors received power received at the aperture antenna. The aperture antenna includes an aperture region facing an aperture region between twisted portions of the twisted pair wire. | 07-04-2013 |
20130196610 | WIRELESS COMMUNICATION SYSTEM - A first communication apparatus and a second communication apparatus are capable of wireless communication with each other. The first communication apparatus has a normal operation mode and a tuning mode that differs from the normal operation mode and allows a variable matching portion to adjust a matching state. When the tuning mode is selected, the first transmission portion transmits an operation mode transition request signal to the second communication apparatus. A first reception portion receives a tuning reference signal transmitted from the second communication apparatus in response to the operation mode transition request signal. A reception signal intensity measurement portion measures a reception signal intensity of the received tuning reference signal. The variable matching portion adjusts a matching state based on the measured reception signal intensity of the tuning reference signal. | 08-01-2013 |
20130208775 | VEHICULAR POWER LINE COMMUNICATION SYSTEM - A vehicular power line communication system includes a master and a slave. The master uses a pair of twisted wires, whose far ends are connected to each other to be loop-shaped, as a power line and a communication line. The master thereby outputs high-frequency signals via the pair of twisted wires, transmitting an electric power and data modulation signals. The slave includes an aperture antenna being loop-shaped to receive data modulation signals using an electromagnetic induction connection in an electromagnetic field generated in the pair of twisted wires in response to an energization current of the pair of twisted wires. The slave further includes an error rate monitor circuit which monitors an error rate of data which are obtained from demodulation of the data modulation signals received via the aperture antenna. | 08-15-2013 |
20140064388 | POWER LINE COMMUNICATION SYSTEM FOR VEHICLE - In a power line communication system, a master uses a twisted pair wire as a power line and a communication line and outputs a power signal and a data modulation signal to a slave. The slave includes an aperture antenna, a power monitoring portion, and a determining portion. The aperture antenna receives the power signal via the twisted pair wire by electromagnetic induction coupling of an electromagnetic field generated at the twisted pair wire in accordance with an applied current of the twisted pair wire. The aperture antenna has an aperture region facing an aperture region between twists of the twisted pair wire. The power monitoring portion monitors a power of the power signal received via the first aperture antenna. The determination portion determines whether to use another operation power received via the twisted pair wire on the basis of the power monitored by the power monitoring portion. | 03-06-2014 |
20140133496 | COMMUNICATION SYSTEM - In a communication system, nodes are coupled to a transmission path in a bus topology. The nodes communicate with each other via the transmission path using communication signals that have a communication frequency and are synchronized with a power supply signal. Each of the nodes includes a coupling portion that transmits and receives the communication signal and the power supply signal using electromagnetic induction in non-contact with the transmission path. Each of the nodes determines whether a collision of the communication signals occurs on the transmission path based on a voltage level of a signal that has the communication frequency and is induced at the coupling portion. | 05-15-2014 |
20140136742 | COMMUNICATION SYSTEM - A communication system includes: a master device; and slave devices communicating with the master device via a transmission line. The master device includes: an electric power supply unit for outputting an electric power supply signal having one specific frequency to the transmission line; a master communication unit for communicating with each slave device through a communication signal; and an electric power supply frequency setting unit for setting the one specific frequency. Each slave device includes: an electric power supply signal input and output unit for retrieving the electric power supply signal having a set frequency from the transmission line; a communication signal input and output unit for receiving and transmitting the communication signal to the transmission line; a slave communication unit for communicating with the master device through the communication signal; and a power source for energizing the slave communication unit according to the electric power supply signal. | 05-15-2014 |
20140153655 | VEHICULAR POWER LINE COMMUNICATION SYSTEM AND TRANSMITTER - An opening area between twisted portions of a pair of twisted wires is arranged to be opposite to an opening area of an aperture antenna of each of communication apparatuses. Thus, the use of the pair of twisted wires permits division of electric power among the communication apparatuses and also communication of signals. In particular, among the opening areas between the twisted portions of the pair of twisted wires, only an opening area, which is in between the twisted portion and the twisted portion and is opposite to the aperture antenna, is formed to be larger than a different opening area. This provides a vehicular power line communication system and a transmitter in the system; the system strengthens electromagnetic induction connection between the transmitter and the receiver to permit power line communication. | 06-05-2014 |