A detailed examination of the electromagnetic field distribution in a 3 layered spherical head exposed to a closely coupled dipole at 900 MHz

This paper presents a detailed description of the electromagnetic field distribution inside a three layered (skin/bone/brain) spherical head model exposed to a closely coupled dipole at 900 MHz, which is taken to be representative of mobile phone exposures. The analysis was conducted using method of multipoles software and validated using internal consistency checks. The results are presented as a comprehensive description of the field in the brain for the benefit of researchers attempting to formulate athermal electromagnetic bioeffect mechanisms. SAR, Eand H-fields in the brain were found to decay in a log linear fashion with radial distance from the centre of the dipole. Field impedance and vector angle between E and H were found to be relatively constant near the source and closely resembling the characteristics of a plane wave travelling through an infinite tissue slab. However there was a large variation in the E and H elliptical polarisation in almost all parts of the brain.