Frequency-Temperature sensitivity reduction with optimized microwave Bragg resonators

TL;DR

This paper presents optimized microwave Bragg resonators with significantly reduced frequency temperature sensitivity, achieving high Q-factors and improved stability for applications in sensing and oscillators without temperature compensation.

Contribution

It introduces a novel design of Bragg resonators with 2-4 times lower temperature sensitivity than current whispering gallery modes and about 30% less than existing Bragg resonators.

Findings

Achieved a temperature coefficient of frequency reduced by 2-4 times compared to whispering gallery resonators.

Developed a hybrid-Bragg-mode resonator with about -12ppm/K sensitivity at 295K.

Single reflector resonator performs similarly to double-Bragg but with a more compact structure.

Abstract

Dielectric resonators are employed to build state-of-the-art low-noise and high- stability oscillators operating at room and cryogenic temperatures. A resonator temperature coefficient of frequency is one criterion of performance. This paper reports on predictions and measurements of this temperature coefficient of frequency for three types of cylindrically-symmetric Bragg resonators operated at microwave frequencies. At room temperature, microwave Bragg resonators have the best potential to reach extremely high Q-factors. Research has been conducted over the last decade on modeling, optimizing and realizing such high Q-factor devices for applications such as filtering, sensing, and frequency metrology. We present an optimized design, which has a temperature sensitivity 2 to 4 times less than current whispering gallery mode resonators without using temperature compensating techniques and about 30% less than other existing Bragg resonators. Also, the performance of a new generation single-layered Bragg resonators, based on a hybrid-Bragg-mode, is reported with a sensitivity of about -12ppm/K at 295K. For a single reflector resonator, it achieves a similar level of performance as a double-Bragg-reflector resonator but with a more compact structure and performs six times better than whispering-gallery-mode resonators. The hybrid resonator promises to deliver a new generation of high-sensitivity sensors and high-stability room-temperature oscillators.