Research On Electromagnetic Radiation Laws Of Mobile's Near Field Region And Protective Measures

With the rapid development of science and technology in modern society, there is a great phenomenon in our society that more and more people possess mobile telephones, which have became a popular tool for communication and the number has increased swiftly. Mean While, safety, healthy and environmental conservation are concerned noW, so it has been a focus that Whether the radiation derived from mobile hurts human body and electrical equipment. As a small power transmitter, a cellular phone can make human head super-irradiated due to its microwave when it is operated with its antenna near to human head, which is located in the near field region. The microwave of a cellular phone may induce thermal and non-thermal effects, consequently, form a possible damage to human body. And, the electrical equipments are interfered and damaged by high-frequency electromagnetic Wave of cellular phone. Therefore, the radiation laws of the telephone's near field region are researched, and the availably protective actions brought forWard are important themes of the security science, which also have significant guidance on the development of green, healthy phone.On the basis of referring the relevant literatures and the former research results over the world, the experimental procedures were designed from mobile application environment and electromagnetic radiation of cellular phone's near field region space Were test. Electromagnetic model of cell phone radiation and electromagnetic model of human biological Were established using matlab software by finite-difference time-domain (FDTD) method, and the internal electric field intensity of head and Specific Absorption Rate (SAR) of head's tissue were carried out on numerical simulation. Electromagnetism protection measures were brought out at last.The main research contents and the achievements in the dissertation are as follows.Firstly, based on the references and literatures in the database both domestic and abroad, the background, hazards, radiation and coupling mechanism of the human body, measurement standards and protection measures of mobile electromagnetic radiation were summarized systematic. Furthermore, with the research methodology of laboratory-based, supplemented by simulation, electromagnetism protections Were designed.Secondly, the theories related to the topic including electromagnetic theory, electromagnetic principle and electromagnetic-field division were introduced; the differences of various research methods (measure, analytics and numerical simulation) were compared and analyzed completely and deeply. Basic principles and methods of FDTD were introduced in details. The basic theories of bio-electromagnetism and electromagnetic radiation metrology parameters Were discussed.Thirdly, the experimental procedures which study electromagnetic radiation of cellular phone's near field region Were designed by using available equipments. The data of test were analyzed in time and space. The space contour maps of cellular phones near field region were established, and relevant conclusions were got.Fourthly, the cellular phone antenna, cellular phones shell and human head model were established, the interaction between human head and cellular phones were simulated by using FDTD algorithm. On the one hand, it derived from the near-field electric field strength of law with the experimental conclusions of mutual authentication; on the other hand, it simulated the effects of electromagnetic radiation on the head.Finally, based on the foregoing findings and retrieved relevant literatures, the achievements were put forWard, including improving cell phone antenna, distance protection, electromagnetic shielding technology, and other related measures and so on.