On the Specific Absorption Rate Behavior of Square-wave Modulated Signals Exposures

In this paper we investigate the Specific Absorption Rate behavior of exposures from square-wave modulated signals in the ultra-high frequency (UHF) band. In particular, we demonstrated, through multiphysics numerical simulations, the SAR deposition equivalency between continuous-wave and square-wave modulated signals carrying the same average power. We show that the thermal diffusivity of the biological sample plays an important role in the derivation of the SAR equivalency: in this paper a biological sample with a low thermal diffusivity, as representative of human tissues, has been considered. These results can pave the way for novel and more simple methodologies to assess the safety of electromagnetic instrumentation employing modulated signals.