一种高抑制小型化带通滤波器  

A Miniaturized Bandpass Filter with High Rejection

作　　者：张友俊[1] 宋婉萍 朱祥李 ZHANG Youjun;SONG Wanping;ZHU Xiangli(School of Information Engineering,Shanghai Maritime University,Shanghai 201306,China)

机构地区：[1]上海海事大学信息工程学院,上海201306

出　　处：《压电与声光》2022年第5期731-735,共5页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金资助项目(No.61775196)。

摘　　要：该文提出了一种具有3个传输零点的高带外抑制小型化带通滤波器。通过耦合控制可在梳状线滤波器响应中引入3个传输零点。通过源/负载耦合和传输线上刻蚀的马刺线可降低带外抑制,使滤波器获得更好的性能。设计并制作了一款小型化带通滤波器实物,仿真结果表明,该文设计的滤波器工作中心频率和相对带宽分别为2.12 GHz和20%,该滤波器的回波损耗优于40 dB,插入损耗小于0.2 dB,带外抑制小于40 dB。此外,该滤波器还具有结构简单紧凑、易加工等特点,实物测试结果与仿真结果基本一致。A miniaturized,high out-of-band rejection bandpass filter with three transmissions zeros was proposed in this paper.Three transmission zeros can be introduced into the response of the comb-line filter by using the coupling control.By using the source/load coupling and the spurlines etched on the transmission line,the out-of-band rejection can be reduced,so that the filter can obtain better performance.A miniaturized bandpass filter is designed and fabricated.The simulation results show that the working center frequency and relative bandwidth of the filter designed in this paper are 2.12 GHz and 20%,respectively,and the return loss of the filter is better than 40 dB,insertion loss is less than 0.2 dB,and out-of-band rejection is less than 40 dB.In addition,the filter has the advantages of simple and compact structure and easy processing.The actual test results are basically consistent with the simulation ones.

关 键 词：马刺线 带通滤波器 低损耗 小型化 传输零点 

分 类 号：TN713[电子电信—电路与系统]