手机电磁射定量分析研究 毕业论文.docVIP

手机电磁辐射定量分析研究 摘 要 关键词： QUANTITATIVE ANANLYSIS OF CELL PHONE ELECTROMAGNETIC RADIATION ABSTRACT 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 guidance on SAR． Many researchers have been done about SAR both in and out of the China. So this paper discusses the mobile electromagnetic radiation from several unique aspects. The numerical simulations for SAR use the FDTD (Finite Difference me 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, introduce mobile phone electromagnetic radiation, the basic concept of specific absorption rate; second, respectively, discussed the frequency and time domain, the basic principles of finite difference method. Derived by the basic principles of mobile phone electromagnetic radiation on the basic equation. Finally, the approximate calculation of the model experiment, and compare the SAR values in different parts of the change. The head obtained is difficult to uneven distribution of the local SAR. In the first model of the largest electric field intensity in the antenna feed point away from the nearest place. Relatively distant from the antenna where the field strength smaller. Region alo