Parisa Khodamzadeh
As the number of mobile users grows, the concern for the potential effects of electromagnetic radiation on human health increases. This paper considers human exposure to electromagnetic fields radiated from a GSM radio base station antenna in the 900 MHz frequency band in both near field and far field ranges. The FDTD method has been used to compute whole-body and maximum 10g-averaged SAR inside a homogenous body. To ensure safe exposure, these values should not exceed reference levels as stipulated by the IEEE and basic restrictions as stipulated by ICNIRP. To examine near field effects, calculations used in this paper are taken from Planet EV propagations for magnitudes of the electric field, E. Three propagation models are used and the results of each are analyzed. This paper shows that with near field measurements, compliance with IEEE reference levels is not the same as compliance with ICNIRP basic restrictions. Furthermore, in the case of far field measurements, frequency levels are well below the current safety standards, but the question of the effects of long-term exposure to radio frequencies is still left open. Therefore, particular attention should be paid on measuring signal strength inside and around an exposed building over a given area.