Material studies on cellular phones for reducing SAR in a human head model

The maximum local SAR induced inside a model of an inhomogeneous human head composed of 450872 cubical cells of dimension 2.5 mm is studied by using the near-field FDTD method under the irradiation of a cellular telephone with different materials. It is found that the smaller values of maximum local SAR are obtained for materials with smaller dielectric constants and conductivities modeled in the box case of the cellular telephone. For materials with larger dielectric constants and conductivities used in the box case of the cellular telephone, larger values of maximum local SAR are obtained and may be over those obtained for a cellular telephone modeled by a dipole antenna. The material studies on cellular telephones will provide a valuable reference for cellular telephone design.