National Institute of Information and Communication Technology (Japan)
Communications Research Laboratory, Inc. (Japan)
Inventor
Utagawa, Hitoshi
Matsui, Toshiaki
Abstract
b, an impedance line 9 satisfying an oscillating condition is connected to a source electrode 8, and a high-frequency pulse signal of an oscillation frequency/frequency bandwidth determined by negative resistance produced by short-duration operation of the microwave transistor 1 and the resonant cavity structure is generated and simultaneously radiated into space.
G01S 13/00 - Systems using the reflection or reradiation of radio waves, e.g. radar systemsAnalogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
H03B 7/14 - Generation of oscillations using active element having a negative resistance between two of its electrodes with frequency-determining element comprising distributed inductance and capacitance active element being semiconductor device
H01Q 23/00 - Antennas with active circuits or circuit elements integrated within them or attached to them
H01Q 19/30 - Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using a secondary device in the form of two or more substantially straight conductive elements the primary active element being centre-fed and substantially straight, e.g. Yagi antenna
H01Q 13/00 - Waveguide horns or mouths Slot antennas Leaky-waveguide antennas Equivalent structures causing radiation along the transmission path of a guided wave
H01Q 9/28 - Conical, cylindrical, cage, strip, gauze or like elements having an extended radiating surface Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines
H01Q 5/00 - Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
H01Q 19/10 - Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
H01Q 15/00 - Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
National Institute of Information and Communications Technology (Japan)
Communications Research Laboratory, Inc. (Japan)
Inventor
Utagawa, Hitoshi
Matsui, Toshiaki
Abstract
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.
H03B 7/14 - Generation of oscillations using active element having a negative resistance between two of its electrodes with frequency-determining element comprising distributed inductance and capacitance active element being semiconductor device
G01S 13/02 - Systems using reflection of radio waves, e.g. primary radar systemsAnalogous systems
H01Q 9/26 - Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength
H01Q 9/28 - Conical, cylindrical, cage, strip, gauze or like elements having an extended radiating surface Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines
National Institute of Information and Communications Technology (Japan)
Communications Research Laboratory, Inc. (Japan)
Inventor
Utagawa, Hitoshi
Matsui, Toshiaki
Abstract
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 S1 equipped with a microwave transistor 1 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 based on negative resistance produced by the short-duration operation of the microwave transistor 1 and 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.
National Institute of Information and Communications Technology (Japan)
Communications Research Laboratory, Inc. (Japan)
Inventor
Utagawa, Hitoshi
Matsui, Toshiaki
Abstract
A baseband signal processing unit changes the collector current of a transistor (20) formed by a bias control circuit (7) in accordance with a baseband transmission signal input from a baseband signal input terminal (18), changing the drain bias of a high-frequency transistor (1) 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 (1), and reception operation is performed by taking out that change as a voltage amplitude change from the baseband signal output terminal (14). 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.
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