Near-Field Shielding Effect of Oval Human Model for Dipole Antenna Using High-Loss Dielectric and Magnetic Materials

Shinichiro NISHIZAWA  Osamu HASHIMOTO  

Publication
IEICE TRANSACTIONS on Communications   Vol.E83-B   No.11   pp.2513-2518
Publication Date: 2000/11/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electromagnetic Compatibility(EMC)
Keyword: 
high loss dielectric-magnetic material,  oval human model,  dipole antenna,  near-field shield,  FDTD method,  

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Summary: 
In this study, the shielding effect of high-loss dielectric and magnetic materials themselves and also an oval human model placed behind these material, were investigated by the FDTD method, for near- and far-field exposure, using the half-wave length dipole antenna. According to the results, a high-loss magnetic material showed a large shielding effect (average 20 dB) compared to the high-loss dielectric material, for near- and far-field shields. Also, the reduction of the shielding effect was small (2 dB) for the high-loss magnetic material, while it was large for the high loss dielectric material, on decreasing the distance between the antenna and shield. Moreover, the variation of the shielding effect on a human model placed behind the shield was small (0.2-1.5 dB) for the high-loss magnetic material, but large for the high-loss dielectric material. This is similar to the results of the shield materials themselves, for the close antenna-shield and human-shield distances, respectively.