Electric Field Propagation in the Proximal Region

A model for electric field propagation above planeearth in the region from 1 meter to 10 km from the source, specifically tailored to permit rapid quantitative solutions of EMI (electromagnetic interference) propagation problems, is obtained from classical ground-wave propagation theory extended to include induction fields. The solution is presented in the form of attenuation and height-gain curves for both vertical and horizontal polarizations and covers the spectrum from dc to 1 GHz. The quantitative effects of soil conditions are investigated by comparing propagation over good earth with propagation over the extremes of dry sand and sea water.