Comparisons of measurements and FDTD calculations of mobile phone electromagnetic far-fields and near-fields

Substantial effort has been placed on investigations of the interaction between RF electromagnetic fields, emitted from hand-held mobile telephones, and the human user. Usually, dosimetric measurement systems incorporating liquid filled head phantoms are used to evaluate the near-field characteristics, and free-space ranges or anechoic chambers for measurements of the far-field antenna radiation properties. However, due to the progress in the computer area, it is now possible to use numerical techniques for studying the electromagnetic fields radiated by a mobile phone. Above all, the FDTD method has offered a powerful approach in analyzing both the near-field and far-field situations with realistic body models. The aim of this study has been to compare the results from measurements and corresponding FDTD calculations of both the far-fields and near-fields emitted by mobile phones when the phone is standing free of surrounding objects and when it is placed in the close proximity of a head phantom.