**Article details**

**Title: **The Geometrical Simplified Model for Study of the Electromagnetic Field Absorption in a Human Head when Using a Cell Phone

**Author(s): ***Grigore Jeler*

**Abstract: **This article presents the problem of the interaction between a plane electromagnetic wave and a spherical biological model that approximates the human brain. It specifies that the head is an idealized model. Although the human head is nowhere near spherical shape and is much better approximated by an elliptical shape, studying spherical model is still useful on the following considerations: simple geometric form represented by a sphere allows a simple mathematical approach and means more accessible computing. With this model, there can be quickly obtained some preliminary results on estimating quantitative absorption of electromagnetic field strength. The information obtained can be used for other more complex approaches on other geometric figures, and situations where electromagnetic waves are flat.

**Keywords: **human head, electromagnetic field, SAR, SEMCAD, FDTD.

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