This paper presents a review of the recent advances in the field of substrate integrated waveguide (SIW) filters, with particular emphasis on the techniques adopted to increase the out-of-band rejection of the filters and on the miniaturization strategies. After an overview of classical approaches to introduce transmission zeros in SIW filters, a number of recently introduced techniques are presented. In particular, the use of specially implemented extracted-poles topologies and of pre-filters is described, discussed, and compared. For each of these techniques, numerical and experimental results are reported for validation.

中文翻译：

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具有传输零点的紧凑型 SIW 滤波器：回顾和当前趋势

本文回顾了衬底集成波导 (SIW) 滤波器领域的最新进展，特别强调了用于增加滤波器带外抑制的技术和小型化策略。在概述了在 SIW 滤波器中引入传输零点的经典方法之后，介绍了一些最近引入的技术。特别地，描述、讨论和比较了专门实施的提取极点拓扑和预滤波器的使用。对于这些技术中的每一种，都会报告数值和实验结果以供验证。