高隔离度声表面波双工器技术研究  

Research on High Isolation Surface Acoustic Wave Duplexer Technology

作　　者：程一民 齐梦珂 李孟辉 潘虹芝 牟笑静 陈建军 张华[2] 曹亮 CHENG Yimin;QI Mengke;LI Menghui;PAN Hongzhi;MU Xiaojing;CHEN Jianjun;ZHANG Hua;CAO Liang(National Defense Key Discipline Laboratory of New Micro-Nano Device and System Technology,Chongqing University,Chongqing 400044,China;The 26th Institute of China Electronics Technology Group Corporation,Chongqing 400060,China)

机构地区：[1]重庆大学新型微纳器件与系统技术国防重点学科实验室,重庆400044 [2]中国电子科技集团公司第二十六研究所,重庆400060

出　　处：《压电与声光》2022年第5期704-708,共5页Piezoelectrics & Acoustooptics

基　　金：国家重点研发计划基金资助项目(No.2019YFB2004800,No.2019YFB2004803);国家自然科学基金资助项目(No.52075061);中央高校基础研究基金资助项目(No.2019CDCGGD320);重庆大学光电工程学院项目研究生科研和创新基金会资助项目(GDYKC202004)。

摘　　要：随着5G通信技术的发展,通信频段的演进对于声学滤波器的性能指标、封装尺寸、集成度等要求越来越高。但在小尺寸的声表面波双工器中,隔离度指标是设计中的一个难点。该文针对如何提高双工器隔离度指标展开研究。基于耦合模模型与电磁仿真模型建立了双工器的仿真模型。通过采用拓扑结构的改进、共地电感与封装外壳的改进等方法,最终实现了在发射端(Tx)隔离度为-60.5 dB,接收端(Rx)隔离度为-50 dB,且具有小插入损耗特征的Band 5双工器设计,较之未改进前的双工器,其隔离度有明显改善。With the development of 5G communication technology,the evolution of communication frequency bands has higher and higher requirements on the performance specifications,package size,and integration of acoustic filters.However,the isolation index is a difficulty point in the design of small-sized surface acoustic wave(SAW)duplexers.This paper studies how to improve the isolation of the duplexer.Based on the Coupling-of-Mode(COM)and the electromagnetic simulation model,a simulation model of the duplexer is established.By improving the topology structure,the common ground inductance and package,etc.,finally,the design of a Band 5 duplexer with-60.5 dB of isolation at the Tx end and-50 dB of isolation at the Rx end,small insertion loss has been realized.Comparing with the unimproved duplexer,the isolation of the proposed one has been significantly improved.

关 键 词：声表面波 双工器 高隔离度 耦合模模型 电磁仿真 

分 类 号：TN384[电子电信—物理电子学] TN65