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).


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    Title :

    Microwave Frequency Discriminator With Sapphire Resonator


    Contributors:

    Published in:

    Publication date :

    1994-11-01



    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English






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