Cooled sapphire resonator provides ultralow phase noise. Apparatus comprises microwave oscillator operating at nominal frequency of about 8.1 GHz, plus frequency-discriminator circuit measuring phase fluctuations of oscillator output. One outstanding feature of frequency discriminator is sapphire resonator serving as phase reference. Sapphire resonator is dielectric ring resonator operating in "whispering-gallery" mode. Functions at room temperature, but for better performance, typically cooled to operating temperature of about 80 K. Similar resonator described in "Sapphire Ring Resonator for Microwave Oscillator" (NPO-18082).
Microwave Frequency Discriminator With Sapphire Resonator
NASA Tech Briefs ; 18 , 11
1994-11-01
Miscellaneous
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English
Microwave Frequency Discriminator With Sapphire Resonator
Online Contents | 1994
Temperature-Compensated Sapphire Microwave Resonator
NTRS | 1996
|Sapphire Ring Resonator For Microwave Oscillator
NTRS | 1991
|Electronic frequency discriminator
NTRS | 1967
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