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US 4,405,925 AGranted
Microwave transceiver, particularly for a doppler radar system
AssigneeLicentia Patent-Verwaltungs-G.m.b.H.
InventorsKurt Lindner, Theodor Schutz
Life of this patent
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AssigneeLicentia Patent-Verwaltungs-G.m.b.H.
InventorsKurt Lindner, Theodor Schutz
Estimating the term…
In a microwave transceiver including a dielectric antenna and a self-oscillating semiconductor mixer stage for both generating a microwave signal to be transmitted via the antenna and mixing that microwave signal with reflected microwave signal components received by the antenna, the mixer stage being composed of a nonlinear microwave diode connected to give the stage a negative impedance to permit oscillation and to effect mixing, and a half-wavelength disc-type resonator providing a resonant circuit for the oscillator and having the form of a stripline piece element composed of two strip conductors between which the microwave diode is electrically conductively connected, the antenna being disposed on one of the strip conductors, the resonator and antenna are constructed to be axially symmetrical and are positioned coaxially to one another.
In a microwave transceiver including an antenna and a self-oscillating semiconductor mixer stage for both generating a microwave signal to be transmitted via the antenna and mixing that microwave signal with reflected microwave signal components received by the antenna, the mixer stage being composed of a nonlinear microwave diode connected to give the stage a negative impedance to permit oscillation and to effect mixing, and a half-wavelength disc-type resonator providing a resonant circuit for the oscillator and having the form of a stripline piece element composed of two strip conductors between which the microwave diode is electrically conductively connected, the antenna being a dielectric antenna disposed on one of the strip conductors, the diode having at least one lead which is brought through the resonator, and the transceiver further including a high frequency choke disposed on the side of the resonator facing away from the antenna and connected to the one diode lead, the improvement wherein said resonator and said antenna are constructed to be axially symmetrical and are positioned coaxially to one another and said microwave diode is positioned coaxially with respect to said resonator and said antenna.
In a microwave transceiver for a Doppler radar system, which transceiver includes an antenna and a self-oscillating semiconductor mixer stage for both generating a microwave signal to be transmitted via the antenna and mixing that microwave signal with reflected microwave signal components received by the antenna, the mixer stage being composed of a nonlinear microwave diode connected to give the stage a negative impedance to permit oscillation and to effect mixing, and a half-wavelength disc-type resonator providing a resonant circuit for the oscillator and having the form of a stripline piece element composed of two strip conductors between which the microwave diode is electrically conductively connected, the antenna being a dielectric antenna disposed on one of the strip conductors, the diode having at least one lead which is brought through the resonator, and the transceiver further including a high frequency choke disposed on the side of the resonator facing away from the antenna and connected to the one diode lead, the improvement wherein said resonator and said antenna are constructed to be axially symmetrical and are positioned coaxially to one another and said microwave diode is positioned coaxially with respect to said resonator and said antenna.
Dependencies are inferred from the claim text.