E-field errors associated with RF dosimeters for RF human exposure assessment in urban environments

In this paper, the potential errors which could be associated with body-worn RF dosimeters have been analyzed in a multipath environment. A statistical analysis of the azimuth power distribution on average in an urban environment has been done by using the two-dimensional ray-tracing technique. The surface electric field on a human body when it impinges with different angles of arrival has been characterized based on the finite-difference time-domain method. Despite the differences among all the multipath scenarios presented, in the place where the dosimeter would be located, the variations in the electric field level at 900 MHz are similar but at least 5 dB lower than the E-field level when the human is not present.