A Room-Temperature 20 GHz Sapphire-Loaded Cavity Oscillator Exploiting Pound–Galani Stabilization for Maximized Phase Noise Performance
High-stability reference oscillators are essential for precision microwave applications, including radar systems and radio astronomy. This article presents an expanded analysis of a 20 GHz sapphire-loaded cavity oscillator (SLCO) with Pound–Galani stabilization. The enhanced research study delves into the whispering gallery mode (WGM) resonator characteristics. Experimental results validate the oscillator’s near-carrier stability, showing a phase noise of −96.5 dBcHz<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">−1</sup> at 1 kHz offset frequency with a loaded quality factor exceeding 85 000. This work provides deeper insights into the design trade-offs and performance enhancements necessary for ultralow-phase-noise oscillators, making SLCOs viable for next-generation precision microwave systems at room temperature.
Authors
- Robin Kaesbach (ORCID: https://orcid.org/0000-0001-5970-8503)
- Thomas Musch (ORCID: https://orcid.org/0000-0002-3924-0883)
- Marcel van Delden (ORCID: https://orcid.org/0000-0003-1808-3644)
- Lukas Polzin (ORCID: https://orcid.org/0000-0003-0337-3104)
- Lion Kensbock
Institutions
- Ruhr University Bochum (DE)
Publication Details
- Journal
- IEEE Transactions on Microwave Theory and Techniques
- Published
- 2025-09-26
- DOI
- https://doi.org/10.1109/tmtt.2025.3611693
- Primary Topic
- Advanced Frequency and Time Standards
- Type
- article
- Field-Weighted Citation Impact
- 0.00