SAR in PIFA handset antenna designs: an overall system perspective

This paper discusses the specific absorption rate (SAR) issue in handset antenna designs from the system level. Four planar inverted F antenna (PIFA) models were designed for the personal communication system (PCS) frequency band (1850 /spl sim/ 1990 MHz, also referred to as the 1900 MHz band). The free-space and against-the-head antenna efficiencies are measured and analyzed. The measured SAR were normalized by adjusting the transmit (TX) power. Then the antenna efficiencies were combined together to obtain the total radiated power (TRP), which is one of the requirements to evaluate the current handset antenna performance.