Near fields of a portable radio in front of and on the far side of a model of the head

A portable radio such as a cellular telephone that is held against the side of the head induces fields in and around the head. This paper investigates the electric field strength in front of and on the far side of the head due to a vertically-oriented portable radio. The head is represented either by a box or by a sphere. The finite-difference time-domain method using a perfectly-matched layer absorbing boundary is used to compute the fields. The fields are measured using a three-axis probe moved over a plane by a robot positioning system. Good agreement is demonstrated between the measurements and the computations for field components strong enough for an adequate signal to noise ratio in the measured data.