Cell Phone Electromagnetic Radiation Of Finite Difference Time Domain Analysis And Applications

With the development of the mobile communication technology, mobile phone and other mobile communication terminals become more and more popular in public. Because in the process of the calling, there must have certain electromagnetic radiation produced or received by the terminal. These radiation may bring the health hazards to human beings more or less. So the electromagnetic radiation from mobile to human catches much more public's concerns today.At present, the commonly recognized value for electromagnetic radiation to human is SAR (Specific Absorption Rate) . This value comes from the value of the electric-field intensity to evaluate the electromagnetic radiation degree. The study of SAR began from the 1970s abroad, now a lot of countries have already presented some rules or guidances on SAR.Many researches have been done about SAR both in and out of the China. So this paper discusses the mobile electromagnetic radiation from several unique aspects. And also this paper includes the research jobs done at my post-graduate stage. The numerical simulations for SAR use the FDTD (Finite Difference Time Domain) which is commonly used in electromagnetic field calculation. Because of the many orientations of SAR research, this paper focuses on the following aspects:First, the FDTD which is widely used numerical method for electromagnetic field calculation is introduced into the simulation of SAR. Also the method itself, boundary condition and grid spacing are improved for better performance in electromagnetic calculation.Second, because the shape of the different parts of human beings vary a lot while the electromagnetic consts of different organs are also different. The influence of the mobile electromagnetic radiation to different parts of human have large differences. So the comparison of electromagnetic radiation to different parts of human is conducted.Third, on the base of the study of the electromagnetic radiation, people need to diminish the radiation and reduce the hazard to human beings. So a novel idea is invented to coating a layer of metal outside the convential plastic mobile shell. By calculation, the results of analysis are on hand. This can help the design of new mobiles.After the above simulation, BHTE and MPI are introduced into research, that can take good effect to improve the research on mobile electromagnetic radiation.At the end of the paper, using the available equipments, under the limited condition, some validating experiments have been done to testify the possibility of the theoretical method. And from the experiments, it can promote the numerical method.