A Study on the Effect of Grounded Conductive Sheet Placed over PCB for Electromagnetic Noise Shielding

Motoshi TANAKA  Hisashi TAKITA  Hiroshi INOUE  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E89-C   No.1   pp.77-79
Publication Date: 2006/01/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e89-c.1.77
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Section on Near-Field and Far-Field Electromagnetic Absorption and Shielding and Related Technologies)
Category: 
Keyword: 
electromagnetic noise,  shielding,  PCB,  grounded conductive sheet,  FDTD method,  

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Summary: 
The effect of a grounded conductive sheet placed over a PCB with a microstrip line on the electromagnetic noise shielding is discussed experimentally and with FDTD modeling. The grounding position of the sheet, which is connected with the ground plane of PCB, is changed. In results, the resonance frequency is shifted by the grounding position, and reducing the resonance of the input impedance should make a more effective shielding for EM noise radiation below 1 GHz.