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A novel HU-shaped common-mode filter for GHz differential signals

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4 Author(s)
Shu-Jung Wu ; Department of Electrical Engineering, Graduate Institute of Communication Engineering, National Taiwan University, Taipei 10617, Taiwan ; Hao-Hsiang Chuang ; Ting-Kuang Wang ; Tzong-Lin Wu

A novel low-cost filter design for common-mode noise suppression in high-speed differential signals is proposed. It is realized by etching a HU-shaped defected-ground structure (DGS) to perturb the return current of the common-mode noise. A simple LC resonator model for the proposed structure is also developed with good agreement to the full-wave simulation and measurement result. It is found that over 15 dB of common-mode noise suppression can be achieved over a wide frequency ranges from 3.6 to 9.1 GHz, while the differential signals still keep good signal integrity in eye-pattern observation.

Published in:

2008 IEEE International Symposium on Electromagnetic Compatibility

Date of Conference:

18-22 Aug. 2008