REDUCTION OF ELECTROMAGNETIC ABSORPTION IN THE HUMAN HEAD FOR PORTABLE TELEPHONES BY A FERRITE SHEET ATTACHMENT

From the standpoint of reducing the electromagnetic (EM) absorption in the human head for portable telephones, a ferrite sheet is proposed t o use as a protection attachment between the antenna and the head. By using an anatomically based head model and a realistic portable teleph one model. the effects of the ferrite sheet on both the reduction of E M absorption and antenna radiation pattern are numerically analyzed by the finite-difference time-domain (FDTD) method. The results show tha t a ferrite sheet can result in a reduction over 13% for the spatial p eak SAR averaged over one gram of tissue relative to a degradation bel ow 0.6 dB for the antenna radiation pattern.