Abstract: A high power output push-pull microwave oscillator utilizing a plurality of tuned coaxial circuits each mounting a diode at each of two extremities and each being coupled to an output cavity of resonant frequency, f.sub.o, equal to the operating frequency. An equal plurality of second cavities, also resonant at f.sub.o are coupled to bias lines one-fourth wavelength from each of the plurality of tuned coaxial circuits to reflect a short circuit across a tee junction built into the center conductor of each coaxial circuit at the resonant frequency, f.sub.o, when the diodes are in a push-pull or out-of-phase operating mode. The short circuit is removed when the diodes operate in an in-phase mode and the resultant losses effectively suppress the in-phase mode of operation.

Abstract: An accumulating cavity microwave oscillator having a plurality of coaxial circuit mounted negative resistance diodes coupled to the cavity wherein the plurality of coaxial circuits may be mounted in concentric circles or in other symmetrical or non-symmetrical configurations and one or more coupling mechanism outputs may be utilized. No output is required to be located at the center of either the accumulator or the auxiliary cavity thereby allowing cavity tuners to be mounted there. The coupling coefficient in the coaxial circuits is equal to one plus the coupling coefficient of the output probes in order to present a relatively constant load to the diodes over the operating frequency range, thereby maximizing the usable operating frequency range.

Abstract: An improvement in a prior art microwave diode coaxial oscillator circuit comprising an unloaded fundamental frequency cavity for prevention of energy loss in the matching termination at the resonant frequency of the circuit and a second harmonic resonant cavity for controlling second harmonic loading of the diode and for reducing noise in the output signal.