一种基于耦合矩阵的微带线带通滤波器的设计方法  

Design Method for Microstrip Bandpass Filters Based on Coupling Matrix

作　　者：李胜先[1] 傅君眉[1] 吴须大[2] 

机构地区：[1]西安交通大学电子与信息工程学院,西安710049 [2]西安空间无线电技术研究所,西安710100

出　　处：《西安交通大学学报》2007年第6期679-682,745,共5页Journal of Xi'an Jiaotong University

摘　　要：提出了一种微带线带通滤波器的分步式设计方法,首先根据电性能指标得出耦合矩阵,然后采用谐振器、电耦合以及磁耦合等不同结构实现耦合矩阵的各个单元.该方法可直接综合出对称特性、非对称特性类椭圆函数滤波器的耦合矩阵,不仅适用于微带类椭圆函数滤波器的设计,也可应用到同轴腔、圆柱腔等形式滤波器的设计中.设计并研制了一台S波段180 MHz带宽的6阶微带类椭圆函数滤波器,带内损耗起伏小于2.5 dB,1957 MHz及2 327 MHz处的抑制大于55 dB,测试结果与设计值吻合较好,证实方法简单有效.A multi-step design method for microstrip bandpass filters is presented. Firstly, a coupling matrix is obtained through the electric performance requirements of the bandpass filter. Secondly, different structures such as resonators, electric coupling and magnetic coupling are used to realize each unit of the coupling matrix. The method can directly synthesize the coupling matrix for symmetric and asymmetric quasi-elliptic function filter, not only suitable for designing microstrip bandpass filter, but also for designing coaxial or cylindrical cavity filter. An S-band 6- pole quasi-elliptic function microstrip filter is designed and realized with 180 MHz bandwidth, and its performances are as follows： the loss variation within band is less than 2.5 dB, the rejection at 1 957 MHz and 2 327 MHz is more than 55 dB, and the measured data agree well with the predicted values. The design method is proved simple and valid.

关 键 词：微带线 带通滤波器 耦合矩阵 综合 设计方法 

分 类 号：TN830.3[电子电信—信息与通信工程]