Field Pattern of the Vertical Dipole Antenna above a Lossy Half-Space

Abstract

The field pattern of the vertical dipole antenna (VDA) placed above a homogenous and isotropic medium is determined in this paper. The unknown current distribution (UCD) on the antenna is evaluated by solving the system of integral equations of Hallen’s type (SIE-H) using a point-matching method (MoM) and a polynomial current approximation. The influence of the lossy half-space, expressed by the Sommerfeld’s integral kernel (SIK), was modelled with a new, very simple and accurate approximate expression. In the surroundings of the antenna, this expression is valid for all positions of the antenna conductors, as well as all possible combinations of the electrical parameters of the ground. A certain number of numerical results were compared to the corresponding ones from the references.