基于平行耦合微带线和DGS结构的超宽带滤波器  

Ultra-Wideband Bandpass Filter Based on Parallel-coupled Microstrip Lines and Defected Ground Structure

作　　者：王章静[1] 

机构地区：[1]电子科技大学电工学院,四川成都611731

出　　处：《压电与声光》2013年第2期276-278,共3页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金资助项目(61001086;61201271)

摘　　要：提出一种应用于超宽带通信且结构紧凑的平面微带带通滤波器,通带范围为3.1～10.6GHz,带内插损小于1dB,群延时为0.2～0.6ns,高于10dB的带外抑制。超宽带的带宽通过在耦合微带线正下方底面加载缺陷地结构(DGS)实现;分别在耦合线上加载折叠的阶跃阻抗枝节和DGS上附加2条槽线,在通带的低频和高频边沿产生2个传输零点,以获得较好的频带选择性与良好的带外抑制。在实验误差允许下,仿真和测量结果较一致。A compact planar micro-strip band-pass filter with 3. 1- 10.6 GHz bandwidth is proposed. Filter with in-band insertion loss of less than 1 dB, group delay of 0.2-0.6 ns and out-band rejection above 10 dB is pres- ented for ultra-wideband （UWB） applications. The desired UWB band is realized by fabricating a defected ground structure （DGS） in the bottom of the coupled micro-strip lines. A folded stepped-impedance stub fabricated on the frontal surface of the micro-strip lines and two slots slotted in the metal patches of the DGS offer two transmission zeros at both lower and upper edges of the pass-band to improve the pass-band selectivity and band rejection signifi- cantly. The simulated values and measured parameter values are in good agreement within experimental error.

关 键 词：耦合微带线 缺陷地结构(DGS) 折叠阶跃阻抗枝节 2条槽线 带通滤波器 

分 类 号：TN384[电子电信—物理电子学]