Calculation of the electromagnetic field irradiated by linear antennas considering the soil resistivity influence

One of the main tools of the study of electromagnetic compatibility is the antenna. It is used due to its capacity for irradiating electromagnetic waves in several ways and frequencies, thus simulating a possible electromagnetic interference. In this paper the linear antennas were used as analysis tools. The calculation of the components of electric and magnetic field of those irradiated waves is of great importance to know the wave interaction effects with the electromagnetic atmosphere and the devices around it. This study shows the sensitivity of the electromagnetic field in relation to: i) ground resistivity; ii) surface waves, whose contribution increases with the increase of resistivity. These results are of great interest for regions with raised values of resistivity, as the state of Minas Gerais (Brazil) whose average value is 2400 Omega.m (maximum value verified: 10000 Omega.m). The electromagnetic field radiated by an antenna suffers diverse alterations along its propagation way due to obstacles, as, for example, the soil. The knowledge of these effects is important for the study of this wave iteration with electronic devices, being possible, thus, to analyze its susceptibility to such levels of field