This paper presents a compact multilayer substrate integrated waveguide (SIW) bandpass filter with wide stopband. The square SIW cavity resonators in multilayer substrates are horizontally and vertically coupled with magnetic coupling. By properly designing the coupling structure, the couplings between the higher-order resonant modes can be suppressed. Compared with the conventional single-layer SIW filters, the proposed multilayer SIW filter also exhibits a compact size. To verify the design concept, a double-layered SIW filter is fabricated and measured. The measured results agree well with the simulations. The measured results show that the upper stopband of the filter is extended to 2.73 times of the center frequency 8.02 GHz.

中文翻译：

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一种抑制高阶模耦合的宽阻带多层基板集成波导带通滤波器

本文提出了一种具有宽阻带的紧凑型多层基板集成波导 (SIW) 带通滤波器。多层基板中的方形 SIW 腔谐振器采用磁耦合进行水平和垂直耦合。通过适当设计耦合结构，可以抑制高阶谐振模式之间的耦合。与传统的单层 SIW 滤波器相比，所提出的多层 SIW 滤波器还具有紧凑的尺寸。为了验证设计理念，制作并测量了双层 SIW 滤波器。测量结果与模拟结果吻合得很好。实测结果表明，滤波器的上阻带扩展至中心频率8.02 GHz的2.73倍。