This article presented a compact bandpass filter with wide-stopband performance. Two substrate integrated waveguide (SIW) cavities and a short-circuited coplanar line introduced between the two cavities are used to realize a compact third-order bandpass filter. The passband is generated by combining the resonant frequency of TE101 mode of the SIW cavities and the fundamental resonant frequency of the short-circuited coplanar line. The size of the proposed filter reduces significantly in comparison with conventional third-order SIW filters. Moreover, the center frequency (CF) and the bandwidth of the filter can be controlled by adjusting the structural parameters of the filter. In addition, the first higher-order mode TE102 of the SIW cavity is suppressed by minimizing the coupling of TE102 mode in order to obtain wide-stopband performance. The proposed filter is designed, fabricated, and measured, and the simulation and measurement results show a good agreement. The filter exhibits compact size, low loss, and a rejection higher than 20 dB up to 1.94f0.

中文翻译：

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使用基板集成波导腔和短路共面线的宽阻带紧凑型带通滤波器

本文介绍了一种具有宽阻带性能的紧凑型带通滤波器。两个衬底集成波导 (SIW) 腔和在两个腔之间引入的短路共面线用于实现紧凑的三阶带通滤波器。通带是通过结合 TE 的谐振频率产生的101SIW 腔的模式和短路共面线的基本谐振频率。与传统的三阶 SIW 滤波器相比，所提出的滤波器的尺寸显着减小。此外，可以通过调整滤波器的结构参数来控制滤波器的中心频率（CF）和带宽。此外，第一高阶模 TE102通过最小化 TE 的耦合来抑制 SIW 腔的102模式以获得宽阻带性能。对所提出的滤波器进行了设计、制造和测量，仿真和测量结果显示出良好的一致性。该滤波器具有紧凑的尺寸、低损耗和高达 1.94 的高于 20 dB 的抑制F0.