一种基于CSRR_CRLH TL的带通滤波器设计

Design of bandpass filter based on the structure of CSRR_CRLH TL

摘要:

提出一种基于探针加载的互补开口谐振环(CSRR)的复合左右手传输线(CRLH TL)结构。利用CSRR+CRLH结构的谐振特性，并通过延长CRLH耦合缝隙的长度以及增加CSRR中短路探针的数量，在引入传输零点的同时缩小了滤波器的尺寸。经过仿真优化，实现了滤波器宽频带、高选择性和小型化设计。加工了基于该结构的带通滤波器样机，样机整体尺寸为30 mm×15 mm×1.35 mm。测试结果表明，滤波器的中心频率及插入损耗分别为6.6 GHz和0.65 dB，3 dB带宽为9.3 GHz，在无线通信、导航等微波系统中具有良好的应用前景。

Abstract:

A Composite Right/Left-Handed Transmission Line(CRLH TL) structure based on probe-loaded Complementary Split-Ring Resonator(CSRR) is proposed in this paper. Based on the resonant characteristic of CSRR and CRLH structure, the transmission zeros are introduced and the size of the filter is reduced by extending the length of CRLH coupling slot and by increasing the number of short-circuit probes in CSRR. The filter is designed with wide bandwidth, high selectivity and miniaturization. The prototype of the band-pass filter is fabricated. The overall size of the prototype is 30 mm×15 mm×1.35 mm. The test results show that the center frequency and insertion loss of the filter are 6.6 GHz and 0.65 dB respectively, and the 3 dB bandwidth of the filter is 9.3 GHz. The filter shows a good application value in microwave systems such as wireless communication and navigation.