一种适用于窄带滤波器的新型谐振器结构  

A Novel Resonator Structure Suitable for Narrowband Filter

作　　者：陈思艺 徐宇彤 李念 陈峰 CHEN Siyi;XU Yutong;LI Nian;CHEN Feng(College of Mechanical and Electrical Engineering,Soochow University,Suzhou 215021,China;Suzhou HunterSun Electronics Co.,Ltd.Suzhou 215124,China)

机构地区：[1]苏州大学机电工程学院,江苏苏州215021 [2]苏州汉天下电子有限公司,江苏苏州215124

出　　处：《压电与声光》2024年第5期675-679,共5页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金资助项目(12102183)。

摘　　要：滤波器作为信号传输过程中的关键器件,具有筛选、过滤传输信号的作用。提出了一种适用于窄带滤波器的新型谐振器结构,通过堆叠c轴取向相反的异质压电薄膜,削弱机电耦合效应,从而降低谐振器的有效带宽。首先阐述了新型窄带谐振器结构的工作原理,再对传统Mason电路模型进行修正,采用分段式四端口传输线及双变压器模型进行建模,使其适用于所提出的谐振器结构,同时将电路仿真与有限元仿真的结果进行对比,以验证电路模型的准确性。采用常见的阶梯型拓扑构造了窄带滤波器的原理电路,通过仿真得到滤波器的传输特性曲线,论证了窄带滤波的可行性。Filters are essential components in the signal transmission process,serving to screen and filter transmitted signals.In this paper,we propose a novel resonator structure designed for narrow-band filters.The electromechanical coupling coefficient is reduced by stacking heterogeneous piezoelectric films with oppositely oriented c-axes.First,the fundamental principle of the new narrow-band resonator structure is explained through finite element simulations.Furthermore,the traditional Mason circuit model is modified to account for the structure of the proposed resonator.Two transformers associated with four-port transmission lines are employed for the electrical modeling.A comparison of circuit simulation and finite element simulation results is presented to verify the accuracy of the equivalent circuit model.Finally,a basic narrow-band filter is constructed using the widely recognized ladder-type topology.The transmission characteristics of the filter are obtained through simulation,confirming the reliability of the narrow-band filter design.

关 键 词：谐振器 滤波器 窄带 等效电路 有限元仿真 

分 类 号：TN384[电子电信—物理电子学] TN713