Influence of dielectric materials on in-vehicle electromagnetic fields

Numerical simulations and analytical models have been used to investigate the possible impact of various dielectric components of vehicles on internal electromagnetic field distributions. It is found that, apart from the window glazing, the dielectrics investigated have little impact on the internal field populations and average field levels, although there are localized field differences that become more pronounced at higher frequencies. Above 1 GHz typical vehicle glazing panels may increase average field levels for internal sources. However, the windscreen may also reduce the field coupled into the interior under horizontal plane wave illumination from the front of the vehicle at lower frequencies.