Frequency Characteristics of Energy Deposition in Human Model Exposed to Near Field of an Electric or a Magnetic Dipole

Soichi WATANABE  Masao TAKI  Yoshitsugu KAMIMURA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E77-B   No.6   pp.725-731
Publication Date: 1994/06/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Biological Effects of Electromagnetic Fields)
Category: 
Keyword: 
near-field exposure,  biological effect,  specific absorption rate,  finite-difference time-domain method,  

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Summary: 
The frequency characteristics of whole-body averaged specific absorption rates (SARs) in a human model exposed to a near field of an electric dipole or a magnetic dipole are calculated, using a finite-difference time-domain method. The dependences of the characteristics on the orientation of the dipole and on the distance from the source to the model are investigated. It is shown that the resonant peak of the SAR that appears in the E-polarized far-field exposure is observed only when the source is E-polarized and is located at 80cm, while the peak vanishes or is not noted when the source is located at 40cm and 20cm nor when it is H-polarized. The relationships between the whole-body averaged SARs and the incident electromagnetic field strengths are also investigated. It is suggested that the spatially-averaged value of the dominating component between the electric field and the magnetic field over the space where a human body would occupy provides a relevant measure to estimate the whole-body averaged SAR of a body in the vicinity of a small radiation source.