Planar IMPATT diode oscillator using dielectric resonator

Attention is given to two versions of a dielectric resonator planar IMPATT diode oscillator which uses the dielectric resonators as the frequency controlling element. One oscillator operates in pulse mode; the other in CW. The use of two dielectric resonators in an IMPATT planar diode oscillator allows independent control of fundamental and harmonic frequencies. In order to reduce cost, the second-harmonic resonator can be replaced by an open-circuited stub, typically a quarter-wavelength long. However, in this case, the interaction between the fundamental and second harmonic will be greater. A metal/dielectric tuner can be added above and below the dielectric resonator to accommodate normal fabrication tolerances. Attention is given to oscillator topology, circuit analysis, the determination of oscillator efficiency, and experimental results.