一种基于T型缺陷微带结构低通滤波器

摘要

提出了一种T型微带缺陷结构(DMS),并分析了其传输特性,设计并制作了一款基于T型DMS低通滤波器,仿真和实测结果表明,所设计的新型低通滤波器3 dB截止频率为2.9GHz,通带插入损耗小于0.15 dB,回波损耗最大旁瓣优于15 dB.该滤波器设计方法简单,电磁泄漏小,体积小,并且易于与其他电路集成.%AT -shaped defected microstrip structure (DMS) is proposed and its transmission characteristic is studied, then a low pass filter based on T - shaped DMS is designed. Simulation and measurement results indicate that the 3 dB rut - off frequency of the designed filler is 2. 9 GHz, its insertion loss is smaller than 0. 15 dB and its biggest side lamella of return Ion is better than 15 dB. What's more, the proposed filter has a series of advantages such as the design simplicity, little electromagnetic leak, good integration and so on.