作者：张瑜1, 秦元基1, 韩明硕2, 李爽3
作者单位：1. 河南师范大学电子与电气工程学院，河南 新乡 453007;
2. 中国人民解放军91709部队，吉林 珲春 133300;
3. 洛阳师范学院物理与电子信息学院，河南 洛阳 471000
关键词：谐振腔;频率调节;微扰法;介电常数
摘要：
利用谐振腔微扰能够较为准确地测量介质介电常数、低耗材料的复介电常数，对其谐振频率的测量是测量介电常数的关键。由于腔体耦合、通风孔的开口、制造误差以及内壁光洁程度均会造成谐振频率偏移，需对腔体频率进行微调以减小不可避免因素所造成的频率测量误差。根据腔体的工作模式和场结构，以微扰法为原理，在腔体端盖中心处加光滑的圆柱形调节杆实现微调。通过HFSS仿真和实际加工测量，证明腔体的谐振频率与杆体的插入深度成正比关系，同时不影响腔体品质因数和不产生其他模式。该方法可实现腔体谐振频率简单、快速和连续调节，同时增加了调节过程中的容错率，进而保证达到频率标校零点。
Experimental research on rapidly adjusting the resonance frequency of cylindrical resonator
ZHANG Yu1, QIN Yuanji1, HAN Mingshuo2, LI Shuang3
1. College of Electronic and Electrical Engineering, Henan Normal University, Xinxiang 453007, China;
2. 91709 PLA Troops, Hunchun 133300, China;
3. College of Physical and Electronic Information, Luoyang Normal University, Luoyang 471000, China
Abstract: The use of resonance cavity perturbation can more accurately measure the dielectric permittivity of the medium and the complex permittivity of low-loss materials, and the measurement of resonant frequency is the key to measure the permittivity. The offset of resonant frequency can result from cavity coupling, the opening of vent hole, manufacturing error and smooth degree of the inner wall, therefore it is necessary to fine-tune the cavity frequency to reduce the frequency measurement error caused by inevitable factors. According to the working mode and field structure of the cavity and based on the principle of perturbation method, a smooth cylindrical adjuster rod is added at the center of the cavity end cover to realize the fine adjustment. Through HFSS simulation and actual machining measurement, it can be proved that the resonant frequency of the cavity is proportional to the insertion depth of the rod, and it does not affect the quality factor of the cavity and does not produce other modes. This method can realize simple, rapid and continuous adjustment of the resonant frequency of the cavity, and equally increase the fault tolerance rate in the adjustment process, thus ensuring that the zero point of frequency calibration is met.
Keywords: resonator;frequency regulation;perturbation method;dielectric constant
2021, 47(5):6-10 收稿日期: 2020-08-10;收到修改稿日期: 2020-09-23
基金项目: 河南省科技攻关重点项目（172102210046）
作者简介: 张瑜(1963-),男,河南沁阳市人,教授,主要从事教学和电磁场与微波技术理论与应用研究工作
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