一种新颖的缺陷地微带线低通滤波器  

Novel DGS microstrip low-pass filter

作　　者：魏峰[1] 翟阳文[1] 史小卫[1] 陈蕾[2] 黄丘林[1] 

机构地区：[1]西安电子科技大学天线与微波技术重点实验室,陕西西安710071 [2]西安工业大学电子信息工程学院,陕西西安710032

出　　处：《西安电子科技大学学报》2009年第4期645-648,共4页Journal of Xidian University

基　　金：陕西省重大科技创新专项资金资助(2007ZKC(一)01-03)

摘　　要：传统的微带线低通滤波器尺寸偏大，阻带较窄，针对此问题提出了一种新型微带线低通滤波器，该滤波器由半圆型缺陷地结构（S-DGS）单元和半圆型阶梯阻抗并联枝节（S-SISS）级联而成．分析了S-DGS和S-SISS的参数变化对其带阻特性的影响，建立了微带线滤波器的等效电路模型．该滤波器结构紧凑，3dB截止频率为2．7GHz，阻带为4～16GHz，比传统缺陷地结构滤波器阻带拓宽了20％．测试结果与仿真结果吻合较好，验证了所设计滤波器的可靠性．A conventional microstrip low-pass filter has a large area and a narrow stop-band. To solve this problem, a new microstrip low-pass filter is presented in this paper, which is composed of semicircle defected ground structures and semicircle stepped-impedance shunt stubs. The effect of parameter variation of S-DGS and S-SISS on band-stop characteristic is studied. An equivalent circuit model of the proposed LPF is also described. The proposed filter is compact and the 3 dB cutoff frequency is 2. 7 GHz. The stop-band is 4-16 GHz, which is wider by 20% than that of the conventional DGS filter. Simulation results are in good agreement with the measured results, which verifies the reliability of the designed filter.

关 键 词：缺陷地结构 阶梯阻抗并联枝节 微带线 低通滤波器 

分 类 号：TN45[电子电信—微电子学与固体电子学]