A Simplified Analytical Model for Human Exposure to Electromagnetic Radiation of HF Wireless Power Transmitter

In this paper, human body exposure to high frequency (HF) electromagnetic field is analysed. Small loop antenna as a transmitter and human body at defined distance are analytically and numerically modelled. The analysis is carried out for simplified cylinder and realistic human body model settled in free space and exposed to HF radiation in terms of induced current density and induced electric field inside the body at frequency of 6.78 MHz. Analytical approach involves the use of the approximate sinusoidal current distribution and analytical evaluation of field integrals. The results obtained analytically are validated by numerical simulations in commercial software FEKO, based on Method of Moments (MoM). It is shown that there is no significant difference in results while using different approaches (analytical and numerical) which is excellent for theoretical calculations limited on simplified models so both approaches can be used for human body exposure estimation in defined scenarios.