二端网络声表面波滤波器电磁仿真分析及设计  

Electromagnetic Simulation Analysis and Design of Two-port Network SAW Filter

作　　者：张显洪[1] 李敏慧 李桦林 ZHANG Xianhong;LI Minhui;LI Hualin(The 26th Institute of China Electronic Technology Group Corporation, Chongqing 400060,China)

机构地区：[1]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》2021年第4期490-493,共4页Piezoelectrics & Acoustooptics

基　　金：国家重大预研基金资助项目。

摘　　要：为了模拟高频低损耗声表面波(SAW)滤波器的设计,该文采用二端口阻抗元2T结构建立了包含外壳及点焊线电磁响应的数学模型,并利用回路电流分析法,推导出该模型下的Y、S参数。且在该模型基础上用Matlab编写了程序,为某电台设计了一款频率为1561 MHz,-1 dB带宽大于30 MHz,插入损耗小于2 dB,带外抑制大于40 dB的SAW滤波器,理论模拟与实测吻合较好,表明了此模型在设计高频低损耗SAW滤波器的可行性。In order to simulate the design of high frequency and low loss SAW filter,a two-port impedance element 2T structure is used to establish a mathematical model including the electromagnetic responses of shell and spot welding line,and the loop current method is used to derive the Y and S parameters of the model.On the basis of this model,the program is written in MATLAB is used to write the program for designing a SAW filter with center frequency of 1561 MHz,the-1 dB bandwidth of greater than 30 MHz,the insertion loss of less than 2 dB,and out-of-band suppression of greater than 40 dB for a radio station.The theoretical simulation is in good agreement with the actual measurement,which shows the feasibility of this model in the design of high frequency and low loss SAW filter.

关 键 词：声表面波滤波器 阻抗元结构 二端口网络 回路电流 电磁仿真 

分 类 号：TN65[电子电信—电路与系统] TM27[一般工业技术—材料科学与工程]