新型差分三通带滤波器设计

Design of novel triple-band differential filter

基于T型支节加载均匀阻抗谐振器,设计了一款新型小型化差分三通带滤波器,并对该滤波器进行了改进设计。所设计滤波器的三个通带中心频率分别为2,6.4,9.2 GHz。-3 dB相对带宽分别为20%(1.85~2.25 GHz)、7%(6.21~6.71 GHz)、5%(8.98~9.44 GHz),通带内插入损耗小于1.5 dB。为了实现良好的共模抑制,在该滤波器中心对称处增加了开路支节,高频处的共模抑制得到显著提高。该滤波器结构简单,能够实现良好的性能,仿真结果与理论分析一致。

A novel miniaturized differential triple-band filter was designed based on the T-shaped structure loaded uniform impedance resonator and improved.The triple-band center frequencies of the designed filter were 2,6.4,9.2 GHz,respectively.The fractional bandwidth of-3 dB is 20%(1.85-2.25 GHz),7%(6.21-6.71 GHz),5%(8.98-9.44 GHz).The insertion loss is less than 1.5 dB in the passband.In order to achieve good common mode rejection,open-circuit branches were added to the central symmetry of the filter.This method improves the common mode rejection of the filter at high frequencies.The designed filter could achieve good performance with simple structure,and the simulation results is consistent with the theoretical analysis.