National Institute of Information and Communications Technology, Incorporated

Communications Research Laboratory, Inc.

Hitoshi Utagawa

Toshiaki Matsui

A radiation type oscillator including a radiation type oscillator substrate including a microwave transistor for generating negative resistance by short-duration operation and a resonant cavity structure; a high-frequency pulse signal of an oscillation frequency/frequency bandwidth determined by negative resistance produced by the short-duration operation of the microwave transistor and the resonant cavity structure is generated as a transmitted RF signal and simultaneously radiated into space. The radiation type oscillator performs oscillating operation when a received RF signal that is a reflected wave of the transmitted RF signal from an object of detection enters the radiation type oscillator, an IF signal is acquired from an IF signal output terminal owing to homodyne mixing by the radiation type oscillator itself, and this is analyzed and processed to detect the object of detection.

Pulse radar device

To provide a microwave/milliwave band high-frequency pulse signal generating device that enables realization of structural simplification, high performance, compact integration, easy design, low power consumption, and low cost. A radiation type oscillator substrate Shaving an inner-layer GNDinterposed between a front-side dielectric substrateand a rear-side dielectric substrateis provided on the radiation surface side with a pair of axially symmetrical patches, a gate electrodeand drain electrodeof a microwave transistorare respectively connected to the conductor patches, DC bias is supplied to the gate electrodethrough an RF choke circuit, a monopulse from a monopulse generation circuitis supplied to the drain electrodethrough an RF choke circuit, an impedance linesatisfying an oscillating condition is connected to a source electrode, and a high-frequency pulse signal of an oscillation frequency/frequency bandwidth determined by negative resistance produced by short-duration operation of the microwave transistorand the resonant cavity structure is generated and simultaneously radiated into space.

Pulse signal generation device

To provide a microwave/milliwave UWB pulse wireless communication device that enables realization of structural simplification, high performance, compact integration, easy design, low power consumption, and low cost. A radiation type oscillator is configured by a radiation type oscillator substrate Sequipped with a microwave transistorfor generating negative resistance by short-duration operation and a resonant cavity structure, a high-frequency pulse signal of an oscillation frequency/frequency bandwidth determined based on negative resistance produced by the short-duration operation of the microwave transistorand the resonant cavity structure is generated as a transmitted RF signal and simultaneously radiated into space, and the radiation type oscillator is caused to perform oscillating operation when a received RF signal arriving from an external wireless communication device enters the radiation type oscillator, whereby a received data signal is established based on acquisition of an IF signal owing to mixing by the radiation type oscillator itself.

Pulse wireless communication device

This inventive wireless communication system comprises a plurality of wireless communication devices () each including a radiating oscillator (), a baseband signal generating unit () and a reception signal detecting unit (). In this wireless communication network system, the wireless communication devices are arranged to face each other at a location where a pull-in phenomenon is caused, a signal transmitted from one of the wireless communication devices is an oscillation signal of the radiating oscillator () of the one of the wireless communication devices, the frequency of the oscillation signal varies with the baseband signal, the variation in the frequency is transmitted to the other ones of the facing wireless communication devices () by the pull-in phenomenon, the oscillation frequencies of the radiating oscillators () of the other ones of the facing wireless communication devices () also vary, and the other ones of the facing wireless communication devices () extract the variation by receiving the variation in the frequency through the reception signal detecting units (). As a result, the present invention can provide a less expensive wireless network system which comprises wireless communication devices having respectively a very simple structure, consumes less electric power and can secure high-quality signal transmission.

Wireless communication network system

A baseband signal processing unit changes the collector current of a transistor () formed by a bias control circuit () in accordance with a baseband transmission signal input from a baseband signal input terminal (), changing the drain bias of a high-frequency transistor () to realize frequency modulation by changing the oscillation frequency, and the radiation wave thereof forms a transmit RF signal, whereby the transmission operation is performed. On the other hand, the oscillation signal is synchronized with a frequency modulated RF signal that arrives from outside, the change in frequency caused by the frequency modulation is generated as a change in the drain bias of the high-frequency transistor (), and reception operation is performed by taking out that change as a voltage amplitude change from the baseband signal output terminal (). As a result, it is possible to provide a microwave/millimeter wave communication apparatus that is simple in structure, low cost, and low power consumption.

Microwave/millimeter wave communication apparatus

A microwave/millimeter wave sensor apparatus including a planar radiation type oscillator substrate having an inner-layer GND interposed between a front surface side dielectric substrate and a rear surface side dielectric substrate and a pair of conductor patches in an axis-symmetric manner on the side of the front surface layer. A gate and drain of a microwave transistor are respectively connected to the conductor patches to supply power to the gate and the drain of the microwave transistor through a gate-side RF choke circuit and a drain-side RF choke circuit. An impedance line satisfying an oscillation condition is connected to a source and a transmit RF signal in an RF zone as a planar radiation type oscillator is transmitted and a receive RF signal as reflected waves is received from a measured object, thus obtaining an IF signal as the sensing information through homodyne mixing.

Microwave/millimeter wave sensor apparatus

A wireless communication device having extremely simple constitution is used, and a low-cost and low power consumption wireless network system with high-quality signals is provided. The wireless network system comprises a plurality of wireless communication devices () each comprising a radiating oscillator () configured to integrate a transistor into a microwave oscillating resonator to generate a negative resistance and to commonly use a function of an antenna (), an intermediate frequency signal generating section () and a receiving signal detecting section (). In the wireless network system, the wireless communication devices are arranged to face at a position, at least one of the wireless communication devices has an intermediate frequency signal generating section having a frequency band signal generating function different from that of others, the receiving signal detection section having a function that can discriminate and receive a frequency band different from that of others, a signal transmitted from the one wireless communication device is transmitted to the other facing wireless communication device, and the other facing wireless communication device receives and extracts the signal by the receiving signal detecting section.

Growing community of inventors

Koganei, Japan

Hitoshi Utagawa