一种新型结构的SIR双波段带阻滤波器

A novel dual-band bandstop filter using stepped impedance resonators

文章提出了一种新型的双波段带阻滤波器结构,其中2个平行连接的λ/4开路线采用阶梯阻抗谐振器结构,来实现双波段带阻特性,耦合横截面采用城墙式的形状,使得整体结构变得紧凑、尺寸变小;仿真设计了阻带中心频率分别为0.9 GHz和2.4 GHz的双波段带阻滤波器,仿真结果表明所设计的双波段带阻滤波器具有通带内插入损耗小、阻带特性良好且带外损耗小等优点。

A novel dual-band bandstop filter（DBBSF） is presented in this paper.The stepped impedance resonators（SIRs） are utilized to two parallel-connected open stubs with a quarter wavelength long at the respective mid-stopband frequencies to obtain dual-stopband performance.Meanwhile,the rampart configuration is applied to the coupling stubs to make the filter compact and smaller.Finally,a DBBSF using SIRs is simulated,of which the mid-stopband frequencies are 0.9 GHz and 2.4 GHz respectively.The simulation results show that the designed filter has the advantages of small passband insertion losses,well-behaved bandstop characteristics and favorable out-of-band response.