基于缺陷地结构的三分支线定向耦合器设计  

A three-branch-line directional coupler using defected ground structure(DGS)

作　　者：李霁晨 刘开雨 李天龙 LI Jichen;LIU Kaiyu;LI Tianlong(Aerospace Information Research Institute(AIR),Chinese Academy of Sciences(CAS),Beijing 100190,China;University of Chinese Academy of Sciences,School of Electronic,Electrical and Communication Engineering,Beijing 100049,China)

机构地区：[1]中国科学院空天信息创新研究院,北京100190 [2]中国科学院大学电子电气与通信工程学院,北京100049

出　　处：《电子元件与材料》2020年第2期79-82,共4页Electronic Components And Materials

基　　金：国家重点研发计划项目(2017YFB0502700);国家自然科学基金(61601437)

摘　　要：针对高特征阻抗微带传输线的线宽过窄难以加工实现以及器件耐功率性差的问题,提出了利用缺陷地结构(DGS)提高微带传输线特征阻抗的方法,在传统三分支线定向耦合器结构支节线下方接地平面设计蚀刻矩形DGS结构,实现高特征阻抗支节线,完成阻抗匹配,且实现了较大的工作带宽。采用电磁仿真软件进行建模仿真分析、参数优化并制作出实际电路进行测试验证,结果表明该定向耦合器在4.5~5.5 GHz频带内具有较低的插入损耗、较高的幅度和相位稳定度,性能良好,具有一定的实用价值。Considering the narrow linewidth of the microstrip transmission line with high characteristic impedance and the power rate of the device,the defected ground structure(DGS)was used to improve the characteristic impedance of the microstrip transmission line.The etched rectangular DGS structure was designed on the ground plane under the branch line of the traditional three branch directional coupler to realize the high characteristic impedance branch line and complete the impedance matching,resulting in a broadband working bandwidth.The EM simulation software was used to design the model and optimize the parameters.The fabricated coupler was measured.The results show that the proposed coupler has low insertion loss,high amplitude and phase stability in the band of 4.5-5.5 GHz,indicating good performance and application potential of the device.

关 键 词：缺陷地结构 定向耦合器 特征阻抗 微带传输线 

分 类 号：TN622[电子电信—电路与系统]