一种基于SIR结构的三通带带通滤波器  

A Three-pass Bandpass Filter Based on SIR Structure

作　　者：张志悦 姬五胜[1,2] 童荥贇 戴薇 崔俊海 ZHANG Zhiyue;JI Wusheng;TONG Yingyun;DAI Wei;CUI Junhai(Institute of Antenna and Microwave Techniques,Tianjin University of Technology and Education,Tianjin 300222,China;School of Electronic Engineering,Tianjin University of Technology and Education,Tianjin 300222,China;Shanghai Saintenna Wireless Technology Co.,Ltd.,Shanghai 200444,China)

机构地区：[1]天津职业技术师范大学天线与微波技术研究所,天津300222 [2]天津职业技术师范大学电子工程学院,天津300222 [3]上海圣丹纳无线科技有限公司,上海200444

出　　处：《电讯技术》2019年第9期1101-1106,共6页Telecommunication Engineering

基　　金：2018天津市自然科学基金(18JCYBJC16400);上海圣丹纳无线科技有限公司委托项目

摘　　要：应用双指耦合结构和枝节加载谐振器(Stub-loaded Resonator,SLR)实现了一款基于阶梯阻抗谐振器(Stepped Impedance Resonator,SIR)的滤波器。该滤波器具有3个通带,带外抑制较好,工作频段提高。通过调整阻抗比可调节第二、三通带的谐振频率;SLR结构能够增加通带数量;SLR结构和双指耦合结构均能改善滤波器的S参数。HFSS软件仿真表明,3个通带的中心频率分别为3.5 GHz、6.6 GHz、9.2 GHz,对应的分数带宽分别为5. 7%、3%、2%,S11分别为-18 dB、-22 dB、-24 dB,通带内的S21分别为-1.8 dB、-1 dB、-1 dB。电路的测量结果与仿真结果较为吻合。该滤波器在5G通信的低频段具有应用前景。By using a two-finger coupling structure and a stub-loaded resonator( SLR),a filter based on a stepped impedance resonator( SIR) with three passbands,better out-of-band rejection,and improved operating frequency band is implemented.The resonant frequency of the second and the third bandpass be adjusted by adjusting the impedance ratio.SLR structure can increase the number of passband.Both the SLR structure and the two-finger coupling structure can improve the S parameters of the filter. The simulation with HFSS software shows that the central frequencies of the three passbands are 3.5 GHz,6.6 GHz and 9.2 GHz respectively,the corresponding fractional bandwidth is 5.7%,3% and 2%,respectively;the S11 is better than-18 dB,-22 dB and-24 dB,respectively;the S21 in the passband is better than -1.8 dB,-1 dB and-1 dB,respectively.The measurement results of the circuit are in good agreement with the simulation results.The filter can be used in 5G communication.

关 键 词：5G 带通滤波器 三通带 SIR/SLR 双指耦合结构 

分 类 号：TN713[电子电信—电路与系统]