基于槽线微扰的小型化带通滤波器  

Miniaturized bandpass filter based on slot perturbation

作　　者：徐若锋 唐伟 孔祥林 王俊 赵雷 XU Ruofeng;TANG Wei;KONG Xiangin;WANG Jun;ZHAO Lei(School of Information and Control Engineering,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学信息与控制工程学院,徐州221116

出　　处：《电波科学学报》2023年第3期485-490,501,共7页Chinese Journal of Radio Science

基　　金：国家自然科学基金(51507176,61771226)。

摘　　要：为满足无线通信系统中对紧凑型滤波器的需求,提出一种小型化带通滤波器.该滤波器通过半模基片集成波导与四分之一波长谐振单元的电磁耦合,在高频阻带产生传输零点;通过强磁区域上层金属面开槽线微扰降低了基模谐振频率,在低频阻带产生传输零点.所设计的滤波器在8.8~12 GHz频段实现了带通效应,相对带宽为30.7%,带内插损小于0.5 dB,回波损耗大于15 dB,同等带宽条件下相较无开槽线结构尺寸减少了10%;利用额外谐振单元在高频阻带增加了传输零点,使大于20dB的高频阻带带宽达到了4GHz,实测结果与仿真结果实现了良好的匹配.该滤波器具有加工简单、小体积、低损耗、易集成等特点,为滤波器件小型化提供了新颖的设计思路.In order to meet the demand of compact filter in wireless communication system,a miniaturized bandpass filter is proposed in this paper.The filter generates transmission zeros in the upper stopband through the electromagnetic coupling between half mode substrate integrated waveguide and quarter-wavelength resonant unit.The fundamental resonant frequency is reduced by the slot perturbation of the metal surface in the strong magnetic region,which forms the transmission zero in the lower stopband.The designed filter has the bandwidth ranges from 8.8 to 12 GHz with the fractional bandwidth 30.7%,and the in-band insertion loss is less than 0.5 dB and the return loss is better than 15 dB.The size is reduced by 10%compared with that of the non-slot structure under the circumstance of the same bandwidth.The extra resonant unit forms the transmission zero in the upper stopband,thus the bandwidth of the upper stopband with the suppression level of 20 dB reaches 4 GHz,and the measured results are well matched with the simulated ones.The filter has the characteristics of easy fabrication,small volume,low loss and easy integration,which provides a novel design idea for the miniaturization of filters.

关 键 词：带通滤波器 半模基片集成波导(HMSIW) 开槽线微扰 带外抑制 小型化 

分 类 号：TN713.5[电子电信—电路与系统]