基于COM参数提取技术设计SAW梯形滤波器  

Design SAW Ladder Type Filters Based on COM Parameters Extracting

作　　者：聂广琳[1] 程红亚[2] 汤劲松[1] 

机构地区：[1]四川压电与声光技术研究所,重庆400060 [2]中国电子技术标准化研究所,北京100007

出　　处：《压电与声光》2008年第1期3-5,共3页Piezoelectrics & Acoustooptics

摘　　要：与耦合谐振滤波器(CRF)相比,声表面波(SAW)梯形滤波器具有插入损耗小,功率容量大和芯片尺寸小的优点。该文从COM参数提取出发,结合COM模型和P矩阵级联的方法,设计出一个中心频率约为350MHz,插入损耗仅有1.5 dB的三极SAW梯形滤波器。从样品的测试结果发现,这种基于COM模型的阻抗元滤波器(IEF)的设计思路是正确可行的。SAW ladder type filters developed recently have some important advantages such as low insertion loss, large power handling and small chip size compared with coupled resonator filters. By using COM module and P matrix cascading technology, we fabricate a 3-pole ladder filter based on 36°LiTaO3 substrates. Consequently, the insertion loss of the fabricated filter is less than 1.5 dB at the center frequency of 350 MHz, Furthermore, the purpose of this paper is to clarify the impedance element filter design method based on COM parameter extracting technique.

关 键 词：COM模型 P矩阵 声表面波(SAW)梯形滤波器 阻抗元滤波器 

分 类 号：TN65[电子电信—电路与系统]