Polarization and human body effects on the microwave absorption in a humanhead exposed to radiation from handheld devices

A multigrid finite-difference time-domain code was used to calculate specif ic absorption rate (SAR) distribution in a human head exposed to microwave radiation from handheld antennas. The effect of the human body was taken in to account and different antennas and polarization conditions were consider ed. The distance between the antenna and human head were varied to examine the effect of the human body on the SAR distribution. From the numerical re sults, it is shown that the human body plays a significant role on the SAR value and its distribution in the head [as high as 53% monopole, 41% planar inverted F antenna (PIFA)], It is also shown that the effect of the body i s more dominant at lower frequencies (monopole 900 MHz versus 1.9 GHz), For the monopole case, effect of body is particularly important at larger sepa ration distances from the head, e.g., at d = 4 cm versus d = 0.5 cm, Effect of body is particularly important for the vertical orientation cases for b oth the monopole and PIFA.