High temperature superconducting RF resonators for resonator stabilized oscillators.

摘要

lectromagnetic resonators made of superconducting materials show unusually sharp resonances because resistive losses are minimized. The availability of high quality thin films of YB;I used niobium (Nb) superconducting 2 GHz resonators at 4.2K to investigate the geometry dependence of the quality factor Q and the high frequency phase noise ;One of these YBCO resonators was successfully operated to stabilize an oscillator operating at 2 GHz with overall single-sideband phase noise