外加载谐振腔的理论计算与分析

Analysis and calculation of out-loaded resonant cavity

通过建立外加载谐振腔的等效电路模型,给出了加载以后外加载谐振腔的频率、品质因数和间隙阻抗的解析计算公式,并使用电磁场模拟软件证明了计算结果的正确性。由计算和模拟结果显示,在使用谐振腔加载的方法降低品质因数的同时,还可以利用模式重叠进一步展宽频带。由等效电路模型分析了主腔和负载腔的品质因数、主腔和负载腔之间的频率差以及耦合口的大小对加载后谐振腔的品质因数和间隙阻抗的影响。

The frequency, quality factor and gap impedance of out-loaded resonant cavity have been calculated analytically by the equivalent circuit model, and the results agree well with those of electromagnetic simulation software. The analytical and simulated results show that the main cavity＇s quality factor can be depressed through the out-load technology and the bandwidth can be extended with the mode overlapping. In addition, with the equivalent circuit model, the influences of the main and absorbing cavities＇ quality factors, the frequency deviation between the main and absorbing cavities, and the coupling parameters on the quality factors as well as gap impedance of the out-loaded resonant cavity have been considered.