Radiation from a horizontal electric dipole in the presence of a lossy ground

Abstract

The radiation field of a horizontal electric dipole located above a lossy ground is formulated as a boundary-value problem employing dyadic Green's functions. The resulting field vectors are then split into the primary and secondary components. The primary components represent those that would exist in the absence of the ground, leaving the secondary components to represent the contribution of the ground. For different frequencies and various ground conductivities, the secondary components are determined and compared with the primary ones. The results indicate that in the vicinity of the air–ground interface the effect of the ground on the electric-field components is significant when the field point is inside the ground region while it becomes less significant as the field point moves in the air region away from the interface and toward the source location. On the other hand, the contribution of the ground to the magnetic-field components becomes appreciable only at high frequencies or when the ground conductivity becomes excessively large.