EMC evaluation with consideration of transmitting and receiving antenna patterns in multipath propagation environment

On electromagnetic compatibility (EMC) evaluation in a multipath propagation environment, an angular dispersion of received signals has a significant impact. The size of this dispersion depends on the a transmitting and receiving antenna pattern. In this case, the half power beamwidths (HPBWs) and directions for maximum radiation/reception of antenna patterns may cause increase or decrease of the channel angular dispersion at the receiving point. The EMC assessment with consideration of the transmitter and receiver antenna patterns is based on simulation studies. For modeling propagation phenomena in a multipath environment, a multi-elliptical propagation model is used. This model is based on the transmission characteristics of the channel such as the power delay profile or spectrum (PDP or PDS). Based on PDP/PDS, the ellipses' parameters are determined. These ellipses represent the occurrence locations of radio wave scatterers in the azimuth plane. In this case, the probability density function of angle of departure (PDF of AOD) function is used to modelling the normalized pattern of the transmitting antenna. The PDF of AOD transformation is then the basis for obtaining the power azimuth spectrum (PAS) at the receiving point. At this stage, the receiving antenna pattern are also considered. The measure of the angular dispersion of the received signal is the rms angle spread (AS). AS is based on PAS. The obtained results of the simulations allow to determine the influence of HPBW and the maximum radiation direction of the receiver antenna pattern on AS. This is the basis for the analyzed EMC evaluation.