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. The 9 GHz sapphire oscillator was constructed with the SSB phase noise close to -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. In this work, we focus on 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.
@article{arxiv.2403.18419,
title = {Frequency Stable Microwave Sapphire Oscillators},
author = {Eugene N. Ivanov and Michael E. Tobar},
journal= {arXiv preprint arXiv:2403.18419},
year = {2024}
}