基于T型分支线结构的小型化差分滤波器  

Compact Design of Differential Bandpass Filter Based on T-shaped Resonator

作　　者：张友俊[1] 章庆 

机构地区：[1]上海海事大学,信息工程学院,上海201306

出　　处：《固体电子学研究与进展》2017年第6期414-418,共5页Research & Progress of SSE

基　　金：国家自然科学基金资助项目(61131002)

摘　　要：基于T型分支线结构设计了两种新型的小型化差分滤波器,一种是单通带滤波器,另一种是双通带滤波器。其中,单通带滤波器在中心对称线处增加开路支节,构成T型分支结构,可以实现良好的共模抑制。为了验证上述的理论分析,本文设计两个滤波器(ε_r=2.65,h=1mm),单通带滤波器的差模通带中心频率f0为2.5GHz,阻带范围为3.1~9.7GHz,-3dB相对带宽为14.7%(2.2~2.8GHz);双通带滤波器的差模通带中心频率分别为2.2GHz和6.4GHz,-3dB相对带宽分别为18.2%(2~2.4GHz)和9.2%(6.2~6.8GHz)。实测结果与理论预期一致。In this paper,two novel and compact differential bandpass filters based on Tshaped resonator were proposed.One is the single bandpass filter and the other is the dual-band bandpass filter.For the single bandpass filter,the open stub and stop stub in residence center are used to improve common-mode suppression.To verify the theoretical design,two kinds of filters（εr=2.65,h=1 mm）were fabricated.The single bandpass filter exhibits center frequency of2.5 GHz,stop-band range of 3.1-9.7 GHz,and-3 dB fractional bandwidth of 14.7%（2.2-2.83 GHz）.The dual-band bandpass filter exhibits center frequencies of 2.2 GHz and 6.4 GHz,and-3 dB fractional bandwidths of 18.2%（2-2.4 GHz）and 9.2%（6.2-6.8 GHz）.Good agreements are obtained between the measured results and theoretical expectations.

关 键 词：差分滤波器 T型分支 差模 共模 

分 类 号：TN713[电子电信—电路与系统]