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采用半解析的模式匹配方法分析并计算矩形同轴谐振腔之间窗口耦合的耦合系数,结合等效电路计算了存在第三个谐振腔时两同轴谐振腔之间窗口耦合的耦合系数。比较了计算两腔的耦合系数时,采用模式匹配法和有限元法的计算效率。结果表明,达到相同精度时,模式匹配法具有更高的计算速度。根据计算所得耦合系数设计了两个分别具有对称响应和非对称响应的C波段同轴腔滤波器,经调试后,滤波器测试结果与设计的理论响应吻合较好,验证了模式匹配方法计算矩形同轴谐振腔通过窗口耦合的耦合系数的有效性。
The half-analytical mode matching method was used to analyze and calculate the coupling coefficient of the window coupling between the rectangular coaxial resonators. The equivalent coupling coefficient of the window coupling between the two coaxial resonators in the presence of the third resonator was calculated. Comparing the calculation of the coupling coefficient between two cavities, the computational efficiency of the pattern matching method and the finite element method are compared. The results show that the pattern matching method has a higher computational speed when the same precision is achieved. According to the calculated coupling coefficients, two C-band coaxial cavity filters with symmetrical and asymmetrical responses are designed respectively. After the test, the results of the filter test are in good agreement with the designed theoretical ones. The results show that the pattern matching method can calculate the rectangular The effectiveness of the coupling coefficient of the coaxial resonator through the window coupling.