Suppression Effect by Conducting Plate under Ground Plane for Emission from Printed Circuit Board

Kohshi ABE

IEICE TRANSACTIONS on Electronics   Vol.E89-C    No.1    pp.38-43
Publication Date: 2006/01/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e89-c.1.38
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Near-Field and Far-Field Electromagnetic Absorption and Shielding and Related Technologies)
printed circuit board,  common-mode current,  conducting plate,  suppression effect,  FDTD method,  

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For emission from a printed circuit board (PCB) by the common-mode current, the suppression method based on the image theory by placing a conducting plate under the PCB is presented. In order to evaluate the suppression effect by this method the radiation power from the PCB is calculated by using FDTD method. The numerical results show that placing the conducting plate suppresses the emission by the common-mode current. Especially, using the conducting plate bent the sides, it is possible to suppress the emission by the small conducting plate. Further, the experimental results of a radiation power and a maximum electric field intensity show the validity of the numerical results.