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High Q-factor microwave Fabry-Perot resonator with distributed Bragg reflectors
Jerzy Krupka1, Andrzej Cwikla, Michal Mrozowski
1Institute of Microelectronics and Optoelectronics, Warsaw University of Technology, Poland. krupka@imio.pw.edu.pl
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|November 16, 2005
Summary
Researchers developed a high-Q Fabry-Perot resonator using quartz Bragg reflectors, achieving a 4.3x improvement. This advancement in microwave resonator technology offers enhanced performance for various applications.
Area of Science:
- Physics
- Electrical Engineering
- Materials Science
Background:
- Fabry-Perot resonators are crucial for high-frequency applications.
- Achieving high Q-factors is essential for minimizing signal loss and improving device sensitivity.
- Single-crystal quartz offers desirable dielectric properties for resonator construction.
Purpose of the Study:
- To design and realize a high-Q Fabry-Perot resonator operating at 39 GHz.
- To investigate the performance enhancement provided by single-crystal quartz Bragg reflectors.
- To explore methods for thermal compensation of the resonator's resonant frequency.
Main Methods:
- Fabrication of a Fabry-Perot resonator utilizing two pairs of quarter-wavelength single-crystal quartz Bragg reflectors.
- Finite-difference frequency-domain (FDFD) analysis for rigorous theoretical modeling.
- Comparison of FDFD results with simplified semi-analytical solutions.
- Experimental measurement of resonant frequency and Q-factor.
- Proposal of a thermal compensation technique using metallic rods and cylinders.
Main Results:
- A Fabry-Perot resonator with a Q-factor of approximately 560,000 was successfully realized at 39 GHz.
- The resonator with Bragg reflectors demonstrated a 4.3-fold improvement in Q-factor compared to a resonator without reflectors.
- Excellent agreement was observed between theoretical predictions (FDFD and semi-analytical) and experimental measurements of resonant frequency and Q-factor.
- A thermal compensation method was proposed to stabilize the resonant frequency.
Conclusions:
- Single-crystal quartz Bragg reflectors significantly enhance the Q-factor of Fabry-Perot resonators.
- The FDFD analysis provides an accurate method for predicting resonator performance.
- The proposed thermal compensation technique offers a viable solution for frequency stabilization in demanding applications.