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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Optimum design of a high-Q room- temperature whispering-gallery-mode X-band sapphire resonator
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Optimum design of a high-Q room- temperature whispering-gallery-mode X-band sapphire resonator

机译：高Q室温耳语画廊模式X波段蓝宝石谐振器的优化设计。

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摘要

A process for optimal design of a room-temperature whispering-gallery-mode sapphire resonator has been developed. In particular, design rules were determined to enable choice of the optimum azimuthal mode number and resonator radius for a given resonance frequency. The coupling probe design was investigated and it was found that straight antenna probes aligned radially and positioned in the mid-plane of the resonator gave the highest unloaded Q-factors because of minimized probe losses. We noted that when coupling through this technique (as compared with a perpendicularly positioned probe) the mode standing wave pattern would lock to some asymmetry in the crystal resonator itself and not to the probe. This was confirmed by noting that the coupling could be altered over a significant range by merely rotating the resonator. Following these optimal design rules, we were able to measure the Q-factors of quasi-TE and quasi-TM modes with high precision in four cylindrical sapphire resonators at room temperature. From this analysis, the highest attainable Q-factor is expected to be (2.1 u000b1; 0.1) x 105 at 9 GHz in a quasi-TM mode.
机译：已经开发出一种优化设计的室温耳语画廊模式蓝宝石谐振器的过程。特别地，确定设计规则以使得能够针对给定的谐振频率选择最佳的方位模数和谐振器半径。对耦合探头的设计进行了研究，发现由于天线损耗最小，径向对齐并位于谐振器中平面的直天线探头给出了最高的空载Q因子。我们注意到，通过这种技术进行耦合时（与垂直放置的探头相比），模式驻波图将锁定晶体谐振器本身的某些不对称性，而不是锁定到探头。通过注意到仅通过旋转谐振器就可以在相当大的范围内改变耦合来证实这一点。遵循这些最佳设计规则，我们能够在室温下高精度测量四个圆柱形蓝宝石谐振器中的准TE和准TM模式的Q因子。根据该分析，在准TM模式下，在9 GHz时可达到的最高Q值预计为（2.1 u000b1; 0.1）x 10 5 。

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