应用于多模WLANs的紧凑SIR双频带通滤波器  

A Compact Dual-band Pass Filter Using SIR Resonators for Multimode WLANs

作　　者：夏祖学[1] 陈鹏 薛强[1] 张信歌 

机构地区：[1]西南科技大学信息工程学院,四川绵阳621010 [2]广东通宇通讯股份有限公司,广东中山528437

出　　处：《固体电子学研究与进展》2016年第2期124-127,共4页Research & Progress of SSE

基　　金：西南科技大学实验室开放基金国资处项目(13xnkf47)

摘　　要：提出了一种基于阶梯阻抗谐振器的紧凑、高选择性的微带双频带通滤波器,使用了两个发卡型阶梯阻抗谐振器交叉组成了伪交指结构谐振器,实现了小型化双频滤波器。采用0°馈电结构引入了三个传输零点,从而提高了频率选择特性。加工了微带双频带通滤波器实物,实测结果显示,两个通带中心频率分别为2.41GHz和5.26GHz,中心频率比大于2,带内插损分别为1.06dB和1.59dB,3dB相对带宽分别为22.8%、15.6%,仿真与实测吻合较好。与传统的分支加载、阶梯阻抗等双频滤波器相比,该滤波器具有设计简单、结构紧凑、低插入损耗及高频率选择特性等优点。A novel compact dual-band bandpass filter(DBPF)with high selectivity was proposed in the paper,in which two hairpin type stepped impedance resonators(SIR)were employed to crossly form the pseudo interdigital structure,so the miniaturized DBPF was realized.Through designing 0°feed structure to introduce three transmission zeros,the selectivity of the DBPF was improved.Finally,the DBPF was fabricated and tested.The measured results show that:The central frequency of the dual passbands is at 2.41 and 5.26 GHz,with the central frequencies ratio above 2;the insertion losses are 1.06 dB and 1.59dB;the 3dB fractional frequency bandwidths are about 22.8% and 15.6%,respectively.The simulated and measured results were in good agreement.Compared with the conventional DBPF using branch loading and SIR structure,the proposed filter is simple in design and compact in structure,and has also low insertion loss and good frequency response,it could well satisfy the design requirements.

关 键 词：双带通滤波器 小型化 阶梯阻抗谐振器 伪交指结构 0°馈电 

分 类 号：TN713.5[电子电信—电路与系统]