SAr and efficiency performance of mobile phone antenna with different user hand positions

The effects of hand positions on the mobile phone antenna performance in terms of OTA parameters and peak spatial SAR were studied with a commercial mobile phone model. Different hand positions cause significant change in both OTA performance and SAR values. It was also found that the hand phantom may have positive effect on the mobile phone antenna performance at GSM band. However, higher SAR value is obtained compared to that without hand in DCS band. The OTA performance of mobile phones can be strongly impaired by the hand and therefore tests without the hand will not provide meaningful assessments of the performance under real-life conditions. However, the hand geometry as well as the exact position of the phone inside the hand must be very precisely defined in order to obtain highly reproducible results in future OTA measurements.