基于CRLH结构的小型超宽带滤波器  

Compact UWB Band-Pass Filter Based on CRLH Structure

作　　者：褚庆昕[1] 黄健全[1] 刘传运[1] 

机构地区：[1]华南理工大学电子与信息学院,广州510640

出　　处：《天津大学学报》2011年第4期359-363,共5页Journal of Tianjin University(Science and Technology)

基　　金：国家自然科学基金资助项目(U0635004)国家自然科学青年科学基金资助项目(60801033)

摘　　要：提出一种基于新型复合左右手(CRLH)结构的小型超宽带带通滤波器.CRLH结构的串联电容和并联电感分别由平板电容和短路支节线产生.单元内部存在交叉耦合,调整交叉耦合电容,单元电路可产生3个可控的传输零点,形成具有良好选择性的超宽带带通滤波器.由于仅采用一个CRLH结构单元,滤波器具有较小的尺寸和通带插损(1.5 dB);带内群延时较为平坦,同时滤波器在11.95～16 GHz的阻带范围内传输抑制大于20 dB.A compact ultra wide band（UWB）band-pass filter was proposed using only one unit cell of composite left/right-handed（CRLH）structure.In the unit cell,the surface-to-surface coupling between metal plate and the signal line of coplanar waveguide was used to generate the series capacitance and the high impedance meander lines to pro-vide shunt inductance.A cross-coupled capacitance was introduced to create three controllable transmission-zeros.The proposed filter exhibited an insertion loss less than 1.5 dB in the UWB pass-band with a compact size.Besides,both a flat group delay in the pass-band and a steep roll-off near the pass-band were observed,and a rejection level higher than 20 dB was obtained at the stop-band from 11.95—16 GHz.

关 键 词：共面波导 交叉耦合 复合左右手 带通滤波器 超宽带 

分 类 号：TN04[电子电信—物理电子学] TN713.5