High temperature superconducting (HTS) C-band oscillator with phase noise of −134 dBc/Hz
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A high Q HTS cavity resonator with resonating frequency f0= 5.624 GHz was fabricated using high quality HTS film and high purity sapphire. The unloaded quality factor of the HTS resonator was as high as Q u= 1.09xl06 at the nitrogen temperature, 77 K. A HTS local oscillator combining the high Q cavity resonator with a C-band low noise GaAs HEMT amplifier was then designed and constructed. The phase noise of the oscillator, measured by a HP 3048A noise measurement system, is −134 dBc/Hz at 10 kHz offset when the temperature is 77 K. This result is close to the best level reported by other groups in the world.
KeywordsHTS cavity resonator low phase noise HTS local oscillator
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