Frequency Stable Microwave Sapphire Oscillators

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Abstract

We show that state-of-the-art phase noise and high frequency stability could be simultaneously achieved in a microwave oscillator based on the sapphire-loaded cavity resonator. Two 9 GHz sapphire oscillators were constructed with the single-sideband (SSB) phase noise close t -170 dBc/Hz at an offset frequency of 10 kHz and fractional frequency instability less than 2 10-13 for integration times from 5 to 50 s. This work describes the technique for phase-referencing the microwave sapphire oscillator to a stable radio frequency source. We also discuss the suppression of the fast phase fluctuations of the microwave signal due to its transmission through the high- Q resonator.

Original languageEnglish
Pages (from-to)1642-1645
Number of pages4
JournalIEEE Microwave and Wireless Technology Letters
Volume33
Issue number12
Early online date17 Oct 2023
DOIs
Publication statusPublished - Dec 2023

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