Broadband Explicit Time Domain Model for Human Skin Permittivity

Abstract

Multiterm Debye models, working well in the frequency and time domains, are established to describe the frequency-dependent behavior of complex dielectric properties of dry and wet human skin. The forearm data measured from 10 Hz to 100 GHz, accompanied by the genetic algorithm, are used to find the best multiterm Debye parameters for the models. These broadband models are very helpful and straightforward to investigate the interaction of transient signals such as Gaussian pulses with human skin as a dispersive medium in the time domain. The direct finite difference time domain formulation is used to propagate a Gaussian pulse through each of these media. According to this time domain analysis, the optimized perfectly matched layer and skin depth versus frequency are calculated for every skin model. Good agreement is observed between the calculated and measurement data of skin depths.