An algorithm for computations of the power deposition in human tissue

The finite-difference time-domain (FDTD) is the most often used method for evaluation of electromagnetic fields in human tissue. This is of particular importance for compliance testing of portable telephones. The specific absorption rate (SAR) averaged over 1 or 10 g tissue mass is required by regulations not to exceed a prescribed value. A computer algorithm is developed for post-processing the FDTD data. This algorithm can be used for uniform as well as graded meshes, while the required cubical shape is maintained. Extensive investigations are shown of the resultant SAR due to the number of electric field components used in field averaging, and the volume of air within the cube. The latter is easily controlled in the algorithm, but the regulations on the permissible SAR do not specify it at the present time.