Reduction of specific absorption rate (SAR) for human head using circular patch antenna

The aim of this paper is to analyze the effect of circular microstrip patch antenna over the human head and perform comparative study with the rectangular microstrip antenna by estimating specific absorption rate (SAR) and temperature distribution. Human head is the most sensitive area for radiations coming from the mobile phone. So the exposure of the biological life to the electromagnetic radiation (EM) should be within permissible limits as per the defined standards. Results show that the SAR value of circular patch applicator has been reduced to 0.15 W/kg and temperature distribution is lowered down to 0.9°C at a frequency of 835 MHz as compared to the values for rectangular microstrip patch antenna which are otherwise within specified limits. The numerical simulation has been performed using finite element based COMSOL Multiphysics software.