Radiation patterns of a portable radio handset with simple head models

This paper compares the computed and measured principal-plane radiation patterns of a vertical handset operating near simple box and sphere models of the head, for both the principal component and the cross-polarized component of the electric field. The finite-difference time-domain method is used to model the handset and head and to predict the far fields. The radiation patterns are measured in a 6.1-m cubical anechoic chamber using a battery-operated oscillator within the handset. Very good agreement is shown for both polarization of the electric field, for the handset alone and for the handset and the simple head models. The differences between the measured and computed patterns are about the same for the handset and sphere head as for the handset and box head. This suggests that modelling the curved surface of the sphere with a staircase of cubical cells does not significantly increase the modelling error.