带反射栅结构的RSPUDT声表面波滤波器设计  

Design of RSPUDT SAW Filter with Reflective Gratings

作　　者：董加和[1] 张显洪[1] 朱勇[1] 陈彦光[1] 蒋世义[1] 蒋欣[1] 王岚[1] 

机构地区：[1]中国电子科技集团公司第26研究所,重庆400060

出　　处：《压电与声光》2012年第3期337-339,371,共4页Piezoelectrics & Acoustooptics

摘　　要：一般的谐振型单相单向换能器(RSPUDT)滤波器结构由两个换能器组成,声波在两个换能器之间形成谐振。在换能器间加入反射栅后,由于中间反射栅的作用,增加了声波的有效传输长度,不仅提高了设计的灵活性,最关键的是使芯片尺寸减小,最多可以减小一半。该文采用了这种带反射栅结构的谐振型单相单向换能器设计技术,设计出的谐振型单相单向换能器声表面波滤波器实测结果与仿真吻合较好。A simple RSPUDT filter is composed of two SPUDT interdigital transducers （IDT）, and SAW reso- nates between the two IDTs. To improve designing flexibility and more importantly to reduce chip size, reflective gratings were added between the two IDTs. It is the reflective gratings that increase the effective length of SAW transmission, so that using the new structure the chip size can potentially reduced by a factor two. This structure was adopted in this paper, by which RSPUDT SAW filter was deisgned. The measurement accorded well with simu- lation results.

关 键 词：声表面波滤波器 谐振型单相单向换能器(RSPUDT) 反射栅 

分 类 号：TN65[电子电信—电路与系统]