| With the quick development of the mobile communication technology and the life level ofmankind, more and more mobile phone and other mobile communication terminals are usedwidely in public in modern society. At the same time, environmental conservation has beenstrongly concerned now, and it is widely debated whether the electromagnetic wave emitted bythe electronic equipment will hurt the human's health. Although the mobile phone is a smalltransmitter, it can make human head super-irradiated due to its microwave when it is operatednormally with its antenna near to human head located in the near radiation field, this subject isworth researching in theory and experiments. This paper will research the electric-field strengthand SAR distribution in the human head with the FDTD method.In this thesis, it briefly introduces the basic theory of FDTD method at the beginning, thenassigns the model of single pole antenna and layering human head with the correspondingelectromagnetic parameter; on the basis of the model of mobile phone electromagnetic radiation,we set the reasonable calculation area and absorbing boundary conditions, make FDTD programbased on MATLAB. The distribution of SAR of human head is given in near field intensity of theantenna which is exposed on 900MHz under the peak value of transmitting power according tochanging the distance between the mobile phone and human head. The results Compared with theinternational and Chinese safe standards have been analyzed.The calculation results show when the distance between the mobile phone antenna and thehuman head is 1cm, the maximum of local SAR is larger than the standard of the IEEEC95.1-1992. The medicine research has indicated, the microwave of a mobile phone may induce thermaland non-thermal effects, sequentially it cause a possible damage to human body. Thus it must paythe attention human being.
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