Analysis Of The Impact Of Mobile Phone Radiation On The Human Head

With the rapid development of communication business and the continuousimprovement of people’s living standard, the number of people using mobile phonesis increasing day by day. Therefore, mobile phones have become a tool for fast-exchange information. However, with the popularization of mobile phones, people arepaying much more attention to the electromagnetic (EM) radiation of mobile phonesthat whether is harmful to the human body. As we known, mobile phone is a slow-power transceiver. When cell phones are working, the head is in the near-field zoneand the EM radiation field because of the cell phone antenna close to the human head.And the strong enough EM radiation on the organization of the head may result inthermal effect and non-thermal effect. Thereby it can induce the certain effect to thehead. Therefore, the thesis mainly studies the influence of mobile phone radiation onthe human head. The content of this paper is as follows:First, the dipole antenna is simulated by use of the high frequency simulatorstructure (HFSS). And then the relationships between relative permittivity andconductivity of each tissue of human head and the working frequency are presentedas well.Next, we propose a three-layer-medium model for the head according to thephysiological knowledge of human body, and then derive the expressions of theelectric field intensity based on the relevant EM theory. Furthermore, we calculate thefunctions of the electric field intensity of each tissue of human head as the distancebetween the cell phone and the head. The results show that electric field intensity ofeach tissue decrease non-linearly with the increase of the distance from the cell phoneto the head.Furthermore, we demonstrate the interaction between EM radiation and humanbody caused by two kinds of biological effects, which are thermal effect and non-thermal effect. We calculate the local specific absorption rate (SAR) of human headwith deduced formulae according to the Snell’s law. To verify the accuracy of the results, we also employ the HFSS to simulate human head model and calculate thelocal SAR.Finally, with the comparison of the local SAR values of the brain tissue calculatedby employing the finite-difference time domain method, the Snell’ law-based EMtheory and the HFSS, we find that all the local SAR values have a sharp drop with theincreasing distance from the antenna to the mobile telephone, although there are onlya little difference in these results with different ways. At the end of this chapter, wepropose some effective measures against the EM radiation as well.