Research Of Mobile Communication Base Station (GSM、WCDMA)Electromagnetic Radiation Distribution

With the progress of society and development of communication technology, mankind has entered the era of information society, the mobile communication has become more and more popular, rapid increase in the number of users, to meet the development needs of the network and improve the coverage, network capacity network, large numbers of base construction, especially the city area of the base distribution becomes more and more intensive in total, resulting in the environmental electromagnetic radiation increases, more and more people are worried about electromagnetic radiation effects on health, some base station in the construction process, encounter resistance from residents of failure, therefore, it is necessary in the environment were studied on the base station electromagnetic radiation.According to the "Regulations for electromagnetic radiation protection"(GB8702-88) standard as the basis, in Anhui Province, Hefei City GSM900, WCDMA base station as the research object, through the analysis of field test and data base statistics, according to the "guidelines for the management of environmental radiation protection electromagnetic radiation monitoring instruments and methods"(HJ/TIO.2-1996) prediction formulas of electromagnetic radiation in the axial power density, to predict the electromagnetic radiation intensity of various types of base station antenna axial, ground level, vertical direction from the theory, and calculate the safety distance of mobile communication base station in accordance with the standard, the main conclusions are as follows:1.Electromagnetic radiation intensity of base station antenna axial direction gradually reduced with the increasing distance, in the main lobe direction antenna22.8meters distance. In the direction of electromagnetic radiation intensity generally increases with increasing distance from the first increases and then decreases, the position of the maximum electromagnetic wave mainlobe ground projection point.2.Antenna radiation lobe in vertical direction with a certain width, vertical half power and antenna angle have a certain relationship, the prediction of distribution of mobile base station in vertical direction, the main lobe antenna of high-rise buildings are affected, the maximum value of electromagnetic radiation in the antenna height and the closest floor, reduce the deviation from the main lobe direction deviates more strength, decrease;3. according to the analysis of safety distance, GSM900, general influence range of WCDMA base station main lobe direction in16.1-22.8m, sidelobe maximum impact in the range5.1-7.2m.4. through the Hefei City2011-2012136Unicom station analysis, most of the electromagnetic intensity values were lower, and the bottom of a small high-rise buildings, electromagnetic radiation monitoring value is large,5.4V/m (corresponding to maximum power density of7.735μ W/cm2), all measurement results are in conformity with the "electromagnetic radiation protection regulations"(GB8702-88) in public exposure limit value of40μ W/cm2.5. based on the analysis of the typical base station electromagnetic radiation, vertical comparison, two basic consistent but still has certain deviation, mainly because the prediction is carried out according to the ideal condition, the actual monitoring by the nominal power, the surrounding environment, building reflection, diffraction, diffraction effect.The research results of this thesis, the base station location, construction to provide instructive suggestions for base station location, avoid undeserved and cause unnecessary disputes in its completion or not in compliance with the relevant national environmental standards and forced relocation or removal, resulting in the loss of.