Abstract: A microwave oscillator includes at least two active components and a dielectric resonator. The coupling between each active component and the dielectric resonator is of the transmission type and the inputs of neighboring active components are connected to a first point coupled to the resonator and likewise the outputs of the active components are connected to a second point coupled to the resonator. A push-push oscillator of the above kind is simple to produce and its operation is relatively insensitive to adjustments.

Abstract: The ultrahigh frequency responsive filter according to the invention comprises an ultrahigh frequency oscillator associated with a rapid phase lock loop. The loop comprises a mixer connected with the output of the oscillator and with the output of a synthesizer. A phase comparator receives a band frequency outputted from the mixer and a phase modulated carrier signal to be filtered. The loop also has an amplifier and a low-pass filter circuit receiving the output signal of the phase comparator. The output of the low pass filter is connected with the frequency control input of the oscillator. Thus, the modulated carrier signal is transposed to the frequency of the voltage-controlled oscillator at the same time as it is subject to band pass filtering by the loop. The filter can be used for ultrahigh frequency filtering in directional radio links.