5G频段单腔多模滤波器的设计与仿真  

Design and Simulation of 5G Band Single Cavity Multi-Mode Filter

作　　者：罗兵[1] 刘建圻[2] LUO Bing;LIU Jianqi(School of Electronics and Communications,Guangdong Mechanical and Electrical College,Guangzhou Guangdong 510515,China;School of Automation,Guangdong University of Technology,Guangzhou Guangdong 510520,China)

机构地区：[1]广东机电职业技术学院电子与通信学院,广东广州510515 [2]广东工业大学自动化学院,广东广州510520

出　　处：《电子器件》2021年第2期456-461,共6页Chinese Journal of Electron Devices

基　　金：广东省自然科学基金项目(2018A0303130326,2019A1515011056);国家自然科学基金项目(61701122);广东省省级科技计划项目(2017A010101017)。

摘　　要：介绍了多模滤波器的理论基础,在理论计算与分析的基础上,使用微波仿真软件ADS/HFSS设计了一种5G频段单腔多模滤波器,分析了各模式的电场特性,利用微扰的方式实现了模式之间的相互耦合,加入调谐螺钉的方式改变模式的电场分布,2个耦合简并模的作用相当于2个耦合谐振器,从而在保持谐振回路不变的情况下,使谐振器的个数呈几何级数减少,大大减小了滤波器的体积。利用单腔三模实现了三阶滤波器的设计,结果显示,在通带内(3.3 GHz~3.6 GHz):插入损耗(IL)<1.1 dB,回波损耗(RL)>15.8 dB,驻波比(VSWR)<1.299,在通带右侧4 GHz处引入一个传输零点,使得右侧带外快速衰减。该滤波器具有插入损耗小、体积小、带外抑制性能好的优点,可以应用到5G频段无线通信系统中。The theoretical basis of multi-mode filter, and on the basis of theoretical calculation and analysis, a 5 G band single cavity multi-mode filter is designed by using ads/HFSS simulation software is introduced. The electric field characteristic of each mode is analyzed, and the mutual coupling between modes is realized by the way of perturbation. It can change the electric field distribution of the mode by adding tuning screws, and two coupled degenerate modes act as two coupled resonators, so that the numbers of resonator can be reduced while keeping the resonance loop unchanged. Thus, the size of the filter can be greatly reduced. The results show that in the pass-band(3.3 GHz~3.6 GHz):insertion loss<1.1 dB return loss>15.8 dB,standing wave ratio<1.299,a transmission zero point is introduced at 4 GHz on the right side of the pass-band, which makes the right side out of band attenuation rapidly. The filter has the advantages of small insertion loss, small size and good rejection of out of band, which can be applied to 5 G band wireless communication system.

关 键 词：5G频段 腔体滤波器 多模滤波器 HFSS仿真与优化 驻波比 插入损耗 

分 类 号：TN713[电子电信—电路与系统]