A Simple Method for Predicting Common-Mode Radiation from a Cable Attached to a Conducting Enclosure

Jianqing WANG  Kohji SASABE  Osamu FUJIWARA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E85-B   No.7   pp.1360-1367
Publication Date: 2002/07/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electromagnetic Compatibility(EMC)
Keyword: 
common-mode radiation,  cable,  conducting enclosure,  asymmetrical dipole,  

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Summary: 
Common-mode (CM) radiation from a cable attached to a conducting enclosure has a typical dipole-type antenna structure, in which an equivalent noise voltage source located at the connector excites the attached cable against the enclosure to produce radiated emissions. Based on this mechanism, a simple method for predicting the CM radiation from the cable/enclosure structure was proposed. The method combines an equivalent dipole approximation with sinusoidal current distribution and CM current measurement at a specified location on the cable. Its validity was examined in comparison with the far-field measurement and finite-difference time-domain (FDTD) modeling. The predicted resonance frequencies and CM radiation levels were validated with engineering accuracy, i.e., within 30 MHz and 6 dB, respectively, from the measured and FDTD-modeled results in the frequencies above 150 MHz.