0.1-2 GHz垂直偏波遠方界ばく露の人体モデルに対する身長方向の層誘導電流2乗平均値を用いた全身平均SARの推定

概要

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In this study, for the aim of validating whole-body average SARs in human volunteers for 0.1-2 GHz vertically polarized far-field exposure, we calculated with the FDTD method power absorption (product of whole-boy average SAR and weight) and square values averaged over height of layer induced currents in anatomical based human models for Japanese adults and children standing on a ground. As a result, we found that there exist strong correlations between them, and their regression coefficients have over 0.8 coefficient of determination at frequencies from 0.1 to 2 GHz, and are almost kept constant at frequencies from 300 MHz to 600 MHz with over 0.95 coefficient of determination. We also calculated the circumference integral of magnetic near-fields around a human-body model to reveal that the squares of layer induced currents can be estimated from the magnetic near-fields with relative errors of 25% from 300 MHz to 600 MHz and 1.5% at 100 MHz. This finding implies that the whole-body average SAR in a real human for vertically polarized far-field exposure could be estimated from the square values averaged over the height of layer induced currents. Experimental validation of this finding is a future subject.
The Institute of Electrical Engineers of Japanの論文