Abstract: The present invention provides a communication terminal that enables precise communications with optimum receive sensitivity at any time regardless of any change in peripheral environments of an antenna thereof. The communication terminal including means for transmitting and receiving radio waves is provided with a training mechanism for enabling the communication terminal itself to conduct training mode for tuning receive sensitivity, and switching mechanism for switching between normal communication mode and the training mode. The communication terminal is particularly useful as a communication terminal for automobile in the Intelligent Transport System or the like.

Abstract: The present invention provides an antenna in which a single exciting point can be commonly used by a plurality of frequencies, particularly, a small multi-mode plate antenna, and a small and cheap multi-media wireless apparatus using the antenna. In the antenna, a slit 2 is formed in a conductive plate 1, and resonance is made at an exciting point 3 provided in a part of the conductive plate around the slit 2. Further, enclosed openings 4, 6 are formed in parts which are capacitive when seen from the exciting point 3 on the conductive plate 1, and inductances are formed by conductive strips 5, 7 in the enclosed openings 4, 6 respectively. Another resonance is generated by the conductive strips 5, 7. In such a manner, resonances corresponding to a plurality of frequencies are realized at the exciting point 3.

Abstract: The invention provides a small multimode antenna capable of commonly using a single feeding point at a plurality of frequencies. The antenna includes a radiating conductor 1 disposed above a ground conductor 6 and distributed-constant circuits 2 and 3 coupled to the radiating conductor. Each of the distributed-constant circuits is constructed by a transmission line and has a branch. One end of the radiating conductor and one end of the distributed-constant circuit 2 are connected to each other to be a connection point and, further, the other end of the radiating conductor and one end of the distributed-constant circuit 3 are connected to each other. The connection point is a single feeding point 9 using the ground conductor as an earth. The distributed-constant circuits 2 and 3 are designed as an equivalent circuit in which different stubs are connected in parallel with a transmission line, and impedance matching at a plurality of frequencies is realized at the feeding point.

Abstract: A radio base station, comprising: a time slot preparing unit for preparing a time slot to be transmitted to a radio terminal; a selecting unit for selecting a modulation system and a coding method of the time slot prepared by the preparing unit; a signal processing unit for modulating and coding the time slot prepared by the preparing unit according to the modulation system and the coding method, which are selected by the selecting unit; an amplifying unit for amplifying a slot modulated and coded by the signal processing unit; a controlling unit for controlling the amplifying unit to amplify a transmitting power of a specified priority slot among the plurality of time slots so as to be larger than that of a non-priority slot; and an antenna unit for transmitting the time slot amplified by the amplifying unit.

Abstract: A radio base station, comprising: a time slot preparing unit for preparing a time slot to be transmitted to a radio terminal; a selecting unit for selecting a modulation system and a coding method of the time slot prepared by the preparing unit; a signal processing unit for modulating and coding the time slot prepared by the preparing unit according to the modulation system and the coding method, which are selected by the selecting unit; an amplifying unit for amplifying a slot modulated and coded by the signal processing unit; a controlling unit for controlling the amplifying unit to amplify a transmitting power of a specified priority slot among the plurality of time slots so as to be larger than that of a non-priority slot; and an antenna unit for transmitting the time slot amplified by the amplifying unit.

Abstract: In a time-division multiplexing wireless communication system, an antenna module has plural antenna elements. Receiver high-frequency circuit synthesizes signals from the antenna elements according to an antenna directivity having a desired beam pattern. Demodulator selects one of the received signals from wireless terminals according to the synthesized received signals, and determines transmission beam direction information for use in directing the beam in the selected direction. Weighting circuit generates weight coefficients for setting of the beam patterns and transmission beam directions according to the transmission beam direction information, and produces transmission time slots according to a table listing the relations of the transmission beam directions and the time slots for use in the beam radiation in those directions.

Abstract: The present invention provides an antenna in which a single exciting point can be commonly used by a plurality of frequencies, particularly, a small multi-mode plate antenna, and a small and cheap multi-media wireless apparatus using the antenna. In the antenna, a slit 2 is formed in a conductive plate 1, and resonance is made at an exciting point 3 provided in a part of the conductive plate around the slit 2. Further, enclosed openings 4, 6 are formed in parts which are capacitive when seen from the exciting point 3 on the conductive plate 1, and inductances are formed by conductive strips 5, 7 in the enclosed openings 4, 6 respectively. Another resonance is generated by the conductive strips 5, 7. In such a manner, resonances corresponding to a plurality of frequencies are realized at the exciting point 3.

Abstract: A communication system is provided which enhances communication stability, using chips on which function blocks are formed including sensor, chip ID, and radio transmission/reception functions. The sensor detects biological and chemical materials and physical and stoichiometric quantities such as temperature, pressure, and pH and the sensed results are transmitted to a reader by a radio frequency (RF) function. The chip with the sensor functions at a resonance frequency which is detected by the reader initially during a frequency sweep. No dedicated power source is essential to operate the chips, but instead the chips are triggered into transmitting by the radio frequency signals transmitted from the reader. The frequency and output of transmission from the reader to the chips are variable. Stable communication can be performed without being affected by variation in the chips characteristics depending on manufacturing quality.

Abstract: A system and method are provided for detecting biological and chemical material. To measure biological materials such as genes easily at low costs, the device for implementing a small-sized, high sensitive, economical measurement apparatus is provided. Probes appropriate for target biological materials are fixed on a chip, on which a sensor, identification number, and radio communication function are implemented, the captured targets are detected by the sensors, and the result of sensing are transferred to an external control unit by the radio communication function. The small-sized, high sensitivity measurement apparatus for detecting biological and chemical materials such as genes and measuring physical and chemical amounts such as temperature, pressure, pH, and the like can be implemented.

Abstract: Apparatus including input ports for inputting a plurality of input signals different in frequency of carrier from one another, dividers for respectively dividing each of the plurality of input signals inputted to the input ports into plural form, and phase shifters for respectively assigning a weight of phase to each of divided signals corresponding to a number obtained by subtracting 1 from the number of divisions. A plurality of first combiners are provided for respectively adding up the signals different in the frequency of carrier, out of the divided signals and signals each assigned the weight of phase, a plurality of amplifiers are provided for respectively amplifying signals outputted from the plurality of first combiners, and a second combiner is provided for adding signals outputted from the plurality of amplifiers to output one signal.

Abstract: To provide a novel wireless handset achieving downsized formation and promotion of performance by using independent antennas for transmission and receiving and restraining interference between the antennas for transmission and the antennas for receiving in a communication system. In the communication system, different frequencies for transmission and receiving are simultaneously used, in a wireless handset used in the communication system in which the different frequencies for transmission and for receiving are simultaneously used, a magnetic current antenna for transmission and a magnetic current antenna for receiving are arranged in parallel with each other such that respective magnetic currents are disposed on a straight line.

Abstract: A novel wireless handset is provided which can provide control so as to tune a center frequency of impedance matching of a tunable antenna to a call frequency. A first control signal sent from the central processing unit 51 to the synthesizer 41 or data used in the central processing unit to generate the first control signal is used to generate a second control signal by the central processing unit or the control signal generator 52 provided in the outside connected with the central processing unit, and the second control signal is applied to the control circuit 30 for center frequency of impedance matching, whereby center frequencies of impedance matching of the tunable antenna 10 are controlled.

Abstract: In order to make a wireless handset smaller, a novel slot antenna is provided which can simplify the manufacture process and can be connected to a tunable circuit. A slot is disposed in a narrow side surface of a conductive cube, and a power supply conductor is arranged in the slot so as to intersect the slot. A variable impedance circuit is connected between conductors on opposite edges of the slot in a position at a constant distance from one of the ends of the slot. The control signal varies impedance of the variable impedance circuit so as to control the resonant frequency of the antenna. Transmit/receive antennas are connected by a support so as to align the directions of the main polarizations, and then are arranged on the circuit board of the wireless handset.

Abstract: An antenna element comprises an insulating substrate; a first conductor layer formed continuously on an upper surface, a bottom surface and at least one side surface of the insulating substrate; a strip gap consisting of a portion in which a conductor layer is not formed on an upper surface and/or a side surface of the insulating substrate; and a second strip conductor layer formed in the slot or in an insulated extension connected to the strip gap thereby being electrically insulated from the first conductor layer, the second conductor layer being electrically connected to a feeder. The first conductor layer formed on an upper surface of the insulating substrate is divided by at least one slit gap extending substantially in perpendicular to the direction of electric current at a position separated from the strip gap.

Abstract: A base station for a multi-carrier mobile communication system, which is equipped with an RF amplifier including input ports for inputting a plurality of input signals different in frequency of carrier from one another, dividers for respectively dividing each of the plurality of input signals inputted to the input ports into plural form, and phase shifters for respectively assigning a weight of phase to each of divided signals corresponding to a number obtained by subtracting 1 from the number of divisions. A plurality of first combiners are provided for respectively adding up the signals different in the frequency of carrier, out of the divided signals and signals each assigned the weight of phase, a plurality of amplifiers are provided for respectively amplifying signals outputted from the plurality of first combiners, and a second combiner is provided for adding signals outputted from the plurality of amplifiers to output one signal.

Abstract: In a time-division multiplexing wireless communication system, an antenna module has plural antenna elements. Receiver high-frequency circuit synthesizes signals from the antenna elements according to an antenna directivity having a desired beam pattern. Demodulator selects one of the received signals from wireless terminals according to the synthesized received signals, and determines transmission beam direction information for use in directing the beam in the selected direction. Weighting circuit generates weight coefficients for setting of the beam patterns and transmission beam directions according to the transmission beam direction information, and produces transmission time slots according to a table listing the relations of the transmission beam directions and the time slots for use in the beam radiation in those directions.

Abstract: A power combiner having a plurality of power amplifiers which are even-numbered, a plurality of series-connected branch circuits for respectively distributing input power to the plurality of power amplifiers, and a plurality of series-connected combiners for combining the respective output power of the plurality of power amplifiers. In the case of any one of such combinations as to equalize electric lengths of transmission lines for connecting between two power amplifiers selected from the plurality of power amplifiers, the combinations each being established by using all of the plurality of power amplifiers once, the electric lengths at which the any one of the combinations are established, take &lgr;/2i (where &lgr;=wavelength of fundamental wave, and i=positive integer).

Abstract: The present invention aims to provide a RF amplifier capable of controlling the generation of spurious signals when plural carriers are simultaneously amplified. The RF amplifier includes dividers for respectively dividing each of a plurality of input signals different in frequency of carrier from one another into plural form, phase shifters for respectively assigning weights to phases every divided signals corresponding to a number obtained by subtracting 1 from the divided plural numbers, first combiners for adding up the signals different in the frequency of carrier, of the divided signals and the signals subjected to the phase weighting, amplifiers for respectively amplifying signals outputted from the first combiners, and a second combiner for adding the signals outputted from the amplifiers together to thereby output one signal from the second combiner. Spurious signal components are canceled out by addition of the output signals of the amplifiers.

Abstract: A radio base station, comprising: a time slot preparing unit for preparing a time slot to be transmitted to a radio terminal; a selecting unit for selecting a modulation system and a coding method of the time slot prepared by the preparing unit; a signal processing unit for modulating and coding the time slot prepared by the preparing unit according to the modulation system and the coding method, which are selected by the selecting unit; an amplifying unit for amplifying a slot modulated and coded by the signal processing unit; a controlling unit for controlling the amplifying unit to amplify a transmitting power of a specified priority slot among the plurality of time slots so as to be larger than that of a non-priority slot; and an antenna unit for transmitting the time slot amplified by the amplifying unit.

Abstract: In order to make a wireless handset smaller, there is constructed a novel slot antenna which can simplify the realizing manufacture process and can be connected to a tunable circuit hard to affect the radiated power, so as to mount this antenna to construct the wireless handset.