A Stack of Metal Rings for Reducing Common-Mode Current on a Wire Passing through an Aperture

Sungtek KAHNG  

IEICE TRANSACTIONS on Communications   Vol.E88-B    No.9    pp.3819-3822
Publication Date: 2005/09/01
Online ISSN: 
DOI: 10.1093/ietcom/e88-b.9.3819
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Electromagnetic Compatibility(EMC)
common-mode current emission,  electromagnetic radiation,  EMI filter,  aperture coupling,  wire antenna,  

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Unwanted electromagnetic emission occurs due to the common-mode current on the cables entering a PC's metal enclosure and can be treated as wire antennas passing through the apertures of the enclosure. To reduce the emission, a stack of metal rings is suggested to be placed around the cable and external to the aperture, adopting the concept of a Coaxial Band-Stop Filter, for the first time. The influence of this novel structure on the common-mode current is examined in the FDTD-method frame work.