Design of a wideband common-mode filter using approximate closed- loop pattern of compact C-shaped defected ground structure

doi:10.1016/S1005-8885(17)60213-9

中国邮电高校学报(英文版) ›› 2017, Vol. 24 ›› Issue (3): 70-74.doi: 10.1016/S1005-8885(17)60213-9

Design of a wideband common-mode filter using approximate closed- loop pattern of compact C-shaped defected ground structure

姚引娣¹,曾志斌²

1. 西安邮电大学
2. 西安电子科技大学

收稿日期:2017-01-13 修回日期:2017-04-06 出版日期:2017-06-30 发布日期:2017-06-30
通讯作者: 姚引娣 E-mail:yaoyindi@xupt.edu.cn

Design of a wideband common-mode filter using approximate closed- loop pattern of compact C-shaped defected ground structure

Yin-di YAOZhibin ZENG²

Received:2017-01-13 Revised:2017-04-06 Online:2017-06-30 Published:2017-06-30
Contact: Yin-di YAO E-mail:yaoyindi@xupt.edu.cn

摘要/Abstract

摘要： A compact common-mode filter is proposed to suppress common-mode noise for application of high-speed differential signal traces. The filter adopts one big C-shaped defected ground structure (DGS) cell in the left of ground plane and two small C-shaped DGS cells with opposite direction in the right of ground plane. Because these DGS cells have different dimensions, the filter has three adjacent equivalent resonant points, which can suppress wideband common-mode noise effectively. The left C-shaped DGS and its adjacent C-shaped DGS cell form an approximate closed structure, which can efficiently reduce the influence of the mutual capacitance. The filter provides a common-mode suppression from 3.6 GHz to 14.4 GHz over 15 dB while it has a small size of 10 mm 10 mm. The fractional bandwidth of the filter is 120%, and the differential signals still keep good signal integrity. The experimental results are in good agreement with the simulated results.

关键词: common-mode filter, approximate closed-loop structure, defected ground structure, insertion loss

Abstract: A compact common-mode filter is proposed to suppress common-mode noise for application of high-speed differential signal traces. The filter adopts one big C-shaped defected ground structure (DGS) cell in the left of ground plane and two small C-shaped DGS cells with opposite direction in the right of ground plane. Because these DGS cells have different dimensions, the filter has three adjacent equivalent resonant points, which can suppress wideband common-mode noise effectively. The left C-shaped DGS and its adjacent C-shaped DGS cell form an approximate closed structure, which can efficiently reduce the influence of the mutual capacitance. The filter provides a common-mode suppression from 3.6 GHz to 14.4 GHz over 15 dB while it has a small size of 10 mm 10 mm. The fractional bandwidth of the filter is 120%, and the differential signals still keep good signal integrity. The experimental results are in good agreement with the simulated results.

Key words: common-mode filter, approximate closed-loop structure, defected ground structure, insertion loss

Yin-di YAO Zhibin ZENG. Design of a wideband common-mode filter using approximate closed- loop pattern of compact C-shaped defected ground structure[J]. JOURNAL OF CHINA UNIVERSITIES OF POSTS AND TELECOM, 2017, 24(3): 70-74.

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Design of a wideband common-mode filter using approximate closed- loop pattern of compact C-shaped defected ground structure

Design of a wideband common-mode filter using approximate closed- loop pattern of compact C-shaped defected ground structure

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