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 1111 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.