基于缺陷地抑制高阶谐波的带通滤波器设计  

Design of a Harmonic-Suppressed Bandpass Filter Using a Defected Ground Structure

作　　者：冯梦璐[1] 杨曙辉[2,3] 陈迎潮[3] 

机构地区：[1]北京信息科技大学信息与通信工程学院,北京100101 [2]中国传媒大学通信工程研究所,北京100024 [3]南卡罗莱纳大学电气工程系,美国哥伦比亚29208

出　　处：《电子器件》2016年第1期67-71,共5页Chinese Journal of Electron Devices

基　　金：国家自然科学基金项目(61171039)

摘　　要：采用微带线设计的平行耦合滤波器(MCL-BPF)在通带以外往往产生谐波,出现寄生频段。利用缺陷地结构DGS(Defected Ground Structure)的单极点带阻特性和慢波效应可以改善寄生通带,抑制谐波输出。对2.4 GHz的传统微带平行耦合滤波器和改进型带通滤波器进行了仿真设计与加工测试。实测结果与仿真数据良好吻合,所提出基于斜哑铃型DGS的带通滤波器(S-DGS-BPF)可抑制至四阶谐波,抑制度达到-22 d B以下,阻带为3-10GHz,中心频率处回波损耗为-26.93d B。并且改进型滤波器的尺寸缩小了约10%。Microstrip coupled-line bandpass filter（MCL-BPF）generates parasitic passbands or higher order harmon-ics,which are caused by the employment of microstrip lines. By utilizing the single-pole band-reject characteristics and the slow-wave effect of a defected ground structure（DGS）,the passbands are improved while the high order harmonics are restrained. Both the conventional MCL-BPF and the proposed S-DGS-BPF at the center frequency of 2.4 GHz are analyzed,designed,and fabricated. The measured results agree well with the simulation data,which show a decent harmonic suppression below-22 dB and a return loss of-26.93 dB at the operating frequency,the stop band range is between 3 GHz and 10 GHz. Moreover,a fairly good area reduction of 10%is achieved.

关 键 词：微波带通滤波器 缺陷地结构 宽阻带 谐波抑制 

分 类 号：TN713.5[电子电信—电路与系统]