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High spectral purity microwave oscillator: design using conventional air-dielectric cavity
By: Howe, D.A.; Gupta, A.S.; Nava, J.F.; Walls, F.L.; Hati, A.; Nelson, C.;
2004 / IEEE
This item was taken from the IEEE Periodical ' High spectral purity microwave oscillator: design using conventional air-dielectric cavity ' We report exceptionally low PM noise levels from a microwave oscillator that uses a conventional air-dielectric cavity resonator as a frequency discriminator. Our approach is to increase the discriminator's intrinsic signal-to-noise ratio by use of a high-power carrier signal to interrogate an optimally coupled cavity, while the high-level of the carrier is suppressed before the phase detector. We developed and tested an accurate model of the expected PM noise that indicates, among other things, that a conventional air-dielectric resonator of moderate Q will exhibit less discriminator noise in this approach than do more esoteric and expensive dielectric resonators tuned to a high-order, high-Q mode and driven at the dielectric's optimum power.
Spectral Purity Microwave Oscillator
Pm Noise Levels
Conventional Air-dielectric Cavity Resonator
Discriminators Intrinsic Signal-noise Ratio
High-power Carrier Signal
Optimally Coupled Cavity
Dielectric Optimum Power
Whispering Gallery Modes
Dielectric Resonator Oscillators
Fields, Waves And Electromagnetics