基于耦合缺陷地的超宽带共模滤波器设计  

Design of Ultra-wideband Common- mode Filter Based on Coupled-defected Ground Structure

作　　者：郭观星 李霖[2] 高雄[1] 吕俊男 李进[2] 

机构地区：[1]浙江理工大学启新学院,浙江杭州310018 [2]浙江理工大学信息学院,浙江杭州310018

出　　处：《无线电工程》2014年第8期51-53,共3页Radio Engineering

基　　金：国家自然科学基金资助项目(61101052)

摘　　要：提出了一种采用耦合缺陷接地结构（Coupled-Defected Ground Structure， C-DGS）用于 GHz 差分信号下的新型超宽带共模抑制滤波器。这种新的 C-DGS 由2个彼此相邻的哑铃型 DGS 单元组成。等效电路研究分析表明，与传统的级联DGS 相比， C-DGS 表现出更宽的共模阻带。通过改变 C-DGS 的耦合强度，共模抑制滤波器的阻带带宽可以灵活调整。为了验证这种新的结构，设计、制造并测试了优化后的 C-DGS 测试样品。可以观察到，共模噪声从3.4～12.4 GHz 减少了20 dB以上，而差分信号仍保持良好的质量。A novel ultra-wideband common-mode suppression filter for GHz differential signals using coupled-defected ground structure （C-DGS） is presented. This new C-DGS is composed of two closely located dumbbell-shaped DGS cells. The investigation based on equivalent circuit analysis shows that C-DGS exhibits a much wider common-mode stopband as compared with the conventional cascaded defected ground structure （DGS）.Moreover,the stopband bandwidth for the common-mode suppression filter can be flexibly adjusted by changing the coupled strength of the C-DGS. To verify this new structure,a test sample with the optimized C-DGS is designed,fabricated and tested.The measured results show excellent agreement with theoretical results.It is observed that the common-mode noise can be reduced by over 20 dB from 3.4 to 12.4 GHz,while the differential signals still keep a good quality.

关 键 词：共模滤波器 缺陷接地结构 等效电路 耦合缺陷接地结构 差分信号 

分 类 号：TN713.5[电子电信—电路与系统]