Numerical assessment of absorbed mobile phone radiation in uniformly-scaled standard head models

The study investigated the dependance of absorbed mobile phone radiation in terms of specific absorption rate (SAR) values on head size. A dipole and a generic phone model were used to simulate mobile phone at 900/835 MHz, and standard SAM phantom as an adult head model. Three child head models were derived after uniformly scaling down standard head in all directions by 90%, 80% and 70%. A numerical technique finite difference time domain (FDTD) method computes electromagnetic fields inside the head models. Effect of different relative positions of mobile phones was studied. The experiment results showed that smaller head models produce statistically higher spatial-peak SAR values than larger ones. The maximum increase in peak SAR of up to 16% was observed in the smallest head compared to that in the original head.