Investigation of Specific absorption rate (SAR) near model of fetus in uterus

This article deals with effects of electromagnetic fields (EMF) to different models that represent the model of a pregnant woman- AustinWoman, model in first trimester of pregnancy and model of fetus in uterus in 35 weeks of pregnancy. There are differences between specific absorption rate (SAR) near model of fetus in uterus and AustinWoman model in open area. In the presented approach, the investigation is focused on modelling of EMF proceeded on the finite integration method. The simulations were carried out for specific scenario where a person-pregnant woman was placed in the open space using a cellular phone. The results were evaluated in terms of the SAR values – the determination of electromagnetic (EM) energy absorption inside the human models. Two antennas- dipole antenna with a frequency of 2,4 GHz and planar monopole antenna were designed and work as radio frequency sources in our simulations. In the proposed matching method, two models of human body – Model of fetus in uterus and AustinWoman model - were chosen to simulate in different situations with different models of antennas. Both have the dielectric properties determined to the evaluated frequency of source. The numerical results have shown that the obtained maximal SAR values in AustiWoman model is higher than are maximum values determined according to maximum SAR in European standards limit.