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本文采用模式展开方法,导出了波导E面金属片滤波器的散射参量,进而编写了滤波器优化设计程序,设计、制造和测试了一个长三厘米滤波器,实验结果和理论结果符合得很好。本文方法考虑了高次模式通过谐振腔发生的耦合,设计的滤波器特性比较理想,在频率的低端和高端阻带衰减都较大,所以比采用变分原理导出等效网络参数然后进行综合设计的方法优越。
In this paper, the method of pattern expansion is used to derive the scattering parameters of the waveguide E-face sheet metal filter, and then the filter optimization design program is written to design, manufacture and test a three-centimeter filter. The experimental results are in good agreement with the theoretical results . The proposed method takes into account the coupling of the high-order mode through the resonant cavity. The designed filter has better characteristics and attenuates both the low-end and high-end stopbands. Therefore, the equivalent network parameters are derived using the variational principle and then integrated The design method is superior.