Abstract
Handsets with metal frame, which are very popular recently, cause higher SAR value due to current leakage into the metal frame. We propose a new design to reduce the SAR (Specific Absorption Rate) without degrading antenna performance which is represented by TRP (Total Radiated Power). We place the contact points between PCB GND and the metal frame at the length of λ/2. This distributes the current over wider area and hence reduces SAR. Besides, we extend the PCB GND around the antenna feed to reduce the high current density in the area. Our experiment shows 32% reduction in SAR without degrading TRP.
