基于DGS结构的抑制谐波低通滤波器设计  

Design and Realization of Harmonic-Suppressed Low-Pass Filter Using Defected Ground Structure

作　　者：戚玉洁[1] 刘学观[1] 

机构地区：[1]苏州大学电子信息学院,江苏苏州215021

出　　处：《应用科学学报》2008年第1期51-54,共4页Journal of Applied Sciences

基　　金：苏州大学青年学术骨干基金项目(No.R2317152)

摘　　要：运用DGS等效电路模型与HFSS三维全波仿真相拟合的方法提取出DGS的结构参数,并将该结构应用于交指椭圆函数低通滤波器中,提出了一种新型的DGS滤波器.将交指滤波器两侧馈线设计成阻抗补偿馈线结构,将确定了结构参数的DGS蚀刻于补偿线下方的接地层上,再通过HFSS三维仿真进行匹配优化,得到了通带平坦、阻带宽、结构紧凑的DGS滤波器.实际制作的滤波器测试与仿真结果基本吻合,对谐波具有良好的抑制作用.This paper presents a method to use the equivalent-circuit model and 3-D model simulation for the DGS to extract the dimension parameters. Combining an inter-digital elliptic-function low-pass filter with the DGS structure, a novel filter is proposed. A compensated feed-line structure on the side of the inter-digital elliptic- function low-pass filter is designed, and a couple of suitable DGSs are etched under compensated lines. Furthermore, full-wave simulation and optimization of the proposed filter are obtained with HFSS to get better impedance match. The design gives performances of a fiat passband, a wide stopband and a compact structure. Agreement between experimental results and measurements shows validity of the DGS filter, which has good harmonic-suppressed characterizes.

关 键 词：椭圆函数滤波器 分布元件 缺陷地结构(DGS) 抑制谐波 低通滤波器 

分 类 号：TN911.5[电子电信—通信与信息系统]