In this study, using the finite element method via comsol multiphysics software
package, specific absorption rate (SAR) distributions andtemperature increase are simulated
in 3D human head model exposed to the field radiated from cellular phonewhich consists of
square patch antenna. Both Maxwell and bioheat equations with suitable boundary conditions
are solved to find SAR and temperature distributions. The maximum log scale of SAR
calculated was of the 0.6 while the maximum temperature increase was 0.3 oC for 900 MHz
from the antenna.