具有阻带抑制特性的微带带通滤波器设计

摘要

By the transmission line theory, the paper introduced a transmission zero using a parallel microstrip open-stub line. A proposed filter with 1.9 GHz center frequency, 2％ fractional bandwidth was designed based on dual mode microstrip resonator. The simulation and measurement results of the proposed filter are in good agreement and show the excellent characteristics of up-skirt suppression. The proposed filter can be used for the design of high performance microstrip bandpass filter and diplexers.%应用传输线理论分析了并联微带开路线产生传输零点的原理,设计了一个基于双模谐振器结构,中心频率为1.9 GHz、分数带宽为2%的改进型微带发夹式带通滤波器.仿真和实验结果较为一致,表明该类型的滤波器具有显著的上边阻带抑制特性,可以应用于高性能微波滤波器和双工器的设计中.