User´s hand effect on the Specific Absorption Rate in the head

This study is an investigation of the influence of the user´s hand on the radiated performance of a mobile phone, particularly the peak spatial averaged Specific Absorption Rate (psSAR) averaged over 1 g and 10 g in the head of the user. Recent studies found that the psSAR in the head can be increased by the presence of the hand in some cases. In this study, simulations are performed at 900 and 1800 MHz on different mobile phone models, and the psSAR in the head is recorded with and without a hand holding the mobile phone. Numerical simulations were conducted on four mobile phone models, and hand models were posed in different locations and grips to find the condition with the highest psSAR. Simulations show that the psSAR with the hand can be up to about 2.5 dB higher than without the hand. The psSAR is sensitive to the hand grip, with more than 3 dB variation possible, depending on the hand location and palm distance.