一种基于模式匹配法的窄带Iris波导滤波器设计

摘要

A design method of narrow-band Iris waveguide filter based on Mode-matching is proposed. This design cycle of the filter is shortened a third by the help of Matlab optimization. The relative bandwidth of narrow-band filter is less than 3%. This filter overcomes the problem that high frequency out of band suppression is poor in the millimeter-wave band. The test results show that the insertion loss of the filter is less than 0.8 dB,voltage standing-wave ratio(VSWR)is better than 1.2,center frequency is 34.86 GHz,the out-of-band rejection is 52 dB at 36.5 GHz and it has been successfully used in a millimeter wave radar communication system.%提出了一种基于模式匹配法的窄带Iris波导滤波器设计方法，通过引入Matlab优化使滤波器设计周期缩短了约1/3。设计的窄带滤波器相对带宽小于3%，且较好的克服了毫米波频段滤波器高频端带外抑制较差的难题。测试结果表明，该带通滤波器插入损耗小于0.8 dB，驻波比小于1.2，中心频率34.86 GHz，带外抑制52 dB@36.5 GHz，已被成功应用于某毫米波雷达通信系统中。