Compact 4-pole BRF-based directional filter with even-mode matching circuit for sharp cut-off

Jim S. Sun, A. Corona‐Chavez, Jun H. Choi, T. Itoh
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Abstract

The directional filter structure using λ/2 strip resonators with better filtering performance has been the focus of recent research activities. The band-reject filter based directional filter structure has been demonstrated as an effective way to achieve this goal. However, the prototype reported is cascading resonators in the lateral direction. When the order of the filer gets higher, the lateral cascading leads to rapid oscillation in the stop-band of S41 and a lengthy structure. This paper demonstrated a 4-pole band-reject filter based DF using direct-coupled band-reject filter. It achieves the highest order of DF response reported without the rapid oscillation in the stop-band. Yet it is about 30% smaller compared to previous 3-pole directional filter prototypes.
紧凑的4极基于brf的定向滤波器,具有均匀模式匹配电路,用于锐利截止
采用λ/2带状谐振腔的定向滤波器结构具有较好的滤波性能,是近年来研究的热点。基于带阻滤波器的定向滤波器结构是实现这一目标的有效途径。然而,报道的原型是横向级联谐振器。当滤波器阶数越高时,横向级联导致S41的阻带振荡越快,结构越长。本文采用直接耦合带阻滤波器设计了一种基于DF的四极带阻滤波器。它实现了最高阶的DF响应,而没有在阻带内的快速振荡。然而,与之前的3极定向过滤器原型相比,它缩小了约30%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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