Variation In Human Exposure Dosimetry To 20 MHZ-3 GHZ Electromagnetic Fields Due To Changes In Dielectric Properties

With the wide use of various of electric appliances, an increasing number of people are paying more attention to the potential health effect that electromagnetic exposure brings about. Therefore, it’s of a great significance to get knowledge of the accurate dose of electromagnetic exposure. Specific energy absorption rate (SAR) is often used to assess human exposure to electromagnetic radiation for the radio frequency range, which is strongly related to incident field parameters, characteristic of the body exposed, ground effects and other factors. Besides, SAR is proportional to the conductivity and the square of the internal electric field strength, so detailed knowledge of the dielectric properties, including the permittivity and conductivity, is essential to assess the distribution of SAR.Considering the fact that dielectric properties fluctuates in a certain range due to health and age status, in this work, changes in dielectric properties were taken into account in the simulation of SAR in a Chinese male model exposed to eight orthogonal plane-wave configurations at the frequency range of 20 MHz-3 GHz.The results show that changes in dielectric properties can cause variations in SAR. Moreover, the variation in SAR was influenced by frequency, electric polarization, but incident direction could hardly affect the variation in SAR. And the random changes in dielectric properties which are more realistic could lead to great discrete characteristic of SAR, and this kind of discrete characteristic is important for electromagnetic exposure assessment.The research findings provide more accurate and reasonable electromagnetic exposure dose of human for the guideline of electromagnetic exposure.