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...
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