基于一种改进型DMS结构的极窄带SAW滤波器  

Extreme Narrow Band SAW Filter with an Improved DMS Structure

作　　者：赵雪梅[1] 郑泽渔[1] 董加和[1] 伍平[1] 陈彦光[1] 陈正林 ZHAO Xuemei;ZHENG Zeyu;DONG Jiahe;WU Ping;CHEN Yanguang;CHEN Zhengling(The 26th Institute of China Electronic Technology Group Corporation,Chongqing 400060,China;Science and Technology on Analog Integrated Circuit Laboratory,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 [2]模拟集成电路重点实验室,重庆400060

出　　处：《压电与声光》2022年第2期253-255,共3页Piezoelectrics & Acoustooptics

摘　　要：该文采用一种改进型双模声表面波(DMS)结构来设计1.5 GHz的极窄带声表面波(SAW)滤波器。DMS结构两端的反射器采用分布式多周期加权结构能够消除在声通道上传播的多种声反射模式。为灵活设计滤波器阻带抑制及带宽指标,在DMS结构的两个叉指换能器(IDT)之间加入反射器。结果表明,研制的极窄带SAW滤波器中心频率为1.5 GHz,实测带宽为878.75 kHz,插入损耗为5.8 dB,阻带抑制达到45 dB。An improved double-mode surface acoustic wave(DMS)structure is used to design an extreme narrow band SAW filter at 1.5 GHz.The reflectors at both ends of the DMS structure adopt a distributed multi-period weighting structure,which can eliminate a variety of acoustic reflection modes propagating on the acoustic channel.A reflector is added between two interdigital transducers(IDT)in DMS structure to flexibly design the stopband suppression and bandwidth index of the filter.The results show that the developed extreme narrow band SAW filter has a center frequency of 1.5 GHz,a measured bandwidth of 878.75 kHz,insertion loss of 5.8 dB,and stop-band suppression of 45 dB.

关 键 词：声表面波(SAW)滤波器 极窄带 相对带宽 双模声表面波 

分 类 号：TN65[电子电信—电路与系统]