Whispering gallery mode resonator unit for low phase-noise oscillators

Whispering gallery mode resonator unit for low phase-noise oscillators was designed and tested at room and low temperatures. Use of the E-plane filter and optimization of the unit of coupling the resonator with microstrip transmission line allowed us to separate the operating EH
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mode for the purpose of steady operation of the oscillator at 29.4 GHz. The obtained dependence of the resonator external Q-factor on the resonator height over a microstrip transmission line allows foretelling the transmission coefficient depending on the resonator height over a microstrip line that gives the chance to simplify process of the oscillator tuning, especially at low temperatures.