一种基于微带开口环的双通带滤波器设计

摘要

文中提出了一种基于微带开口环的双通带滤波器设计。对比了非对称开口环结构与传统对称结构的传输特性，讨论了非对称结构中两端馈线位置，双环耦合间距以及环线宽度对于滤波器性能的影响，然后在此基础上，利用两级级联耦合开口环设计了一个用于接收机中抑制镜像的双通带滤波器，带外抑制度较高。%This paper proposes a design of double bandpass microstrip filter based on open-loop resonator, and contrasts the transmission characteristic between the asymmetric and traditional symmetric structure. Discusses the influence on the performance of the filter of the ends in position .the coupling spacing and the width of the loop line in the asymmetric structure. Based on above foundation, uses two surface league coupled open-loop resonator to design a double bandpass filter used for inhibiting the receiver＇ s mirror frequency, bringing high inhibition of the mirror frequency.