Novel electric and magnetic mixed-coupled resonators and a general design method for high selective wideband bandpass filters are presented in this paper. Transmission zeros are introduced in the filters for high selectivity, and the location of the transmission zeros can be adjusted without passband characters changing. To verify the design method, an eighth-order mixed-coupled filter is designed, fabricated and measured; the measured results show higher rejection compared with the conventional interdigital filters. Good agreements are obtained between simulated and measured results.

中文翻译：

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具有混合耦合谐振器的高选择性宽带带通滤波器

本文介绍了新型电磁混合耦合谐振器和高选择性宽带带通滤波器的一般设计方法。滤波器中引入了传输零点以实现高选择性，并且传输零点的位置可以在不改变通带字符的情况下进行调整。为验证设计方法，设计、制作并测量了八阶混合耦合滤波器；与传统的叉指滤波器相比，测量结果显示出更高的抑制。在模拟结果和测量结果之间获得了良好的一致性。