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Reduction of Electromagnetic Absorption in the Human Head for Portable Telephones by a Ferrite Sheet Attachment
Jianqing WANG Osamu FUJIWARA
IEICE TRANSACTIONS on Communications
Publication Date: 1997/12/25
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electromagnetic Compatibility
reduction of SAR, portable telephone, anatomically based head model, FDTD calculation, ferrite sheet,
Full Text: PDF(521.1KB)>>
From the standpoint of reducing the electromagnetic (EM) absorption in the human head for portable telephones, a ferrite sheet is proposed to use as a protection attachment between the antenna and the head. By using an anatomically based head model and a realistic portable telephone model, the effects of the ferrite sheet on both the reduction of EM absorption and antenna radiation pattern are numerically analyzed by the finite-difference time-domain (FDTD) method. The results show that a ferrite sheet can result in a reduction over 13% for the spatial peak SAR averaged over one gram of tissue relative to a degradation below 0.6 dB for the antenna radiation pattern.