声表面波窄带梯形滤波器的仿真与设计  

Simulation and Design of Narrow-band SAW Ladder-type Filter

作　　者：黄华[1] 石玉[1] 钟慧[1] 杜波[1] 

机构地区：[1]电子科技大学微电子与固体电子学院,四川成都610054

出　　处：《压电与声光》2011年第3期350-352,共3页Piezoelectrics & Acoustooptics

摘　　要：使用机电耦合系数小的基片可减小声表面波梯形滤波器的带宽,但会降低基片的声电转换效率,增加滤波器的插入损耗。该文设计了基于m推演结构的梯形滤波器,使滤波器过渡带宽上产生2个额外的传输零点;降低通带宽度,并在此基础上分析了各参数对其性能的影响,通过调整参数以满足不同需求。实验结果表明,中心频率为500 MHz的梯形滤波器,带宽由40 MHz减小到15 MHz,矩形系数由1.6减小到1.3,滤波器的插入损耗增加了0.5 dB。For ladder-type SAW filter,small k2 of piezoelectric substrate could reduce the width of pass-band,which resulted in decreasing the transform efficiency and increasing the insert loss.This paper investigated the structure of m-derived ladder-type filter,which generated two extra transmission zeros to reduce the pass-band.Then electrical parameters were regulated to suit different customer needs by adjusting parameters.As a result,the frequency of the ladder-type filter was 500 MHz,the pass-band decreased from 40 MHz to 15 MHz,the rectangular factor reduced from 1.6 to 1.3,the insertion loss increased with 0.5 dB.

关 键 词：梯形滤波器 m推演 传输零点 窄带 

分 类 号：TN713[电子电信—电路与系统]