5G毫米波三频单阶ISGW腔体滤波器设计  

Design of 5G Millimeter-wave Tri-band Single-order ISGW Cavity Filter

作　　者：林秋华 马志德 罗志勇 王立辉 金世超 LIN Qiuhua;MA Zhide;LUO Zhiyong;WANG Lihui;JIN Shichao(School of Electronics and Communication Engineering,Sun Yat-Sen University,Shenzhen 510275,China;School of Mechanics and Automation,Zhixing College of Hubei University,Wuhan 430011,China;Beijing Institute of Satellite Information Engineering,Beijing 100094,China)

机构地区：[1]中山大学电子与通信工程学院,深圳510275 [2]湖北大学知行学院机械与自动化学院,武汉430011 [3]北京卫星信息工程研究所,北京100094

出　　处：《微波学报》2024年第3期57-63,共7页Journal of Microwaves

基　　金：国家重点专项计划项目(2021YFB2900401),广东省科技厅高级智能感知技术重点实验室科技规划项目(2023B12120600024),湖北省教育厅科学研究计划指导性项目(B2022460)。

摘　　要：本文提出了一种紧凑的三频单阶集成基片间隙波导(ISGW)腔体滤波器。为了限定腔内模式数量,通过分析ISGW腔模的谐振频率关系,设计了一个腔内只有三个谐振模式的ISGW腔体。为了改善频段之间的带外抑制同时提高频率选择性,提出了新颖的三频单阶滤波响应耦合拓扑,然后在研究该腔体内的腔模位于四个端口处的耦合关系的基础上,设计了不同于传统输入输出端口的位置关系,其输入输出端口各有一个“U”型槽,呈90°布局作馈电结构。最后得到了三个通带内只有一个谐振模式的三频单阶腔体滤波器。对该滤波器进行了建模、仿真和构造,然后利用网络分析仪测量了其端口反射传输系数。测试结果表明,该滤波器的三个频段的中心频率分别为f_(01)=24.25 GHz、f_(02)=27.57 GHz和f_(03)=31.14 GHz;插入损耗(IL)分别为IL_(1)=1.58 dB、IL_(2)=1.07 dB和IL_(3)=2.51 dB;有限传输零点(FTZ)分别为FTZ_(1)=20.55 GHz、FTZ_(2)=26.20 GHz、FTZ_(3)=29.37 GHz和FTZ_(4)=33.17 GHz;频段之间的带外抑制优于13 dB。测量结果与仿真结果之间存在一定的频移,但相对带宽优于仿真结果。相比较传统滤波器器件,该款滤波器具有设计频段高、在毫米波频段带外抑制水平高、频率选择性强、整体体积小和质量轻等优势。A compact tri-band single-order integrated substrate gap waveguide(ISGW)cavity filter is proposed in this paper.To restrict the mode numbers in the cavity,the ISGW cavity is designed by analyzing the resonating frequency relationship between these modes,which gets three resonant modes in it.To improve the out-of-band suppression and frequency selectivity,a novel tri-band single-order filtering response coupling topology is proposed.Furthermore,on the basis of studying the coupling relatonship between the four ports of the cavity membrane,the position relationship of the input and output ports is designed,which is different from the traditional input and output ports.Each of the input and output ports has a"U"groove feeding structure with a position relationship of 90°.Finally,the proposed tri-band single-order filter that only has a resonating mode in-band is designed.The filter is modeled,simulated and configurated,and then its reflection and transmission coefficients is measured by using the network analyzer.The measured results show that the three center frequencies of three bands are f_(01)=24.25 GHz,f_(02)=27.57 GHz and f_(03)=31.14 GHz respectively,and the insertion loss(IL)of three passbands are IL_(1)=1.58 dB,IL_(2)=1.07 dB and IL_(3)=2.51 dB respectively.The finite transmission zeros(FTZ)are FTZ_(1)=20.55 GHz,FTZ_(2)=26.20 GHz,FTZ_(3)=29.37 GHz and FTZ_(4)=33.17 GHz respectively.The out-of-band suppression between bands is better than 13 dB.There is a certain frequency shift between the measured results and the simulation results,but the fractional bandwidth is better than the simulation results.Therefore,compared with traditional filters,this filter has the advantages of a high design frequency band,high out-of-band suppression level in the millimeter-wave frequency band,strong frequency selectivity,small overall size,and light weight.

关 键 词：单阶滤波器 集成基片间隙波导 谐振腔模 5G “U”型槽 毫米波 

分 类 号：TN713[电子电信—电路与系统]