LOW-NOISE 9-GHZ SAPPHIRE RESONATOR-OSCILLATOR WITH THERMOELECTRIC TEMPERATURE STABILIZATION AT 300 KELVIN

This letter reports on an X-band microwave oscillator incorporating a room temperature thermoelectric stabilized sapphire resonator operatin g at 9.00000 GHz. With a Galani type stabilization scheme we have meas ured a reduced single sideband phase noise of about -124 dBc/Hz at 1 k Hz with a f(-3) dependence, The measurement was limited by the flicker noise of the phase detector in the feedback electronics, The frequenc y stability was also measured; at an integration time of 0.1 seconds a delta f/f of about 10(-11) with a tau(0.7) dependence was measured, T he frequency drift strongly correlated with ambient temperature fluctu ations.