Radiation Patterns of Two Coupled Vertical Electric Dipoles Placed over Rectangular Screen

Abstract

The 3D vector problem of diffraction of the fields of two coupled vertical electric half-wave dipoles placed over an infinitely thin rectangular ideally conducting screen is solved with use the method of the uniform geometric diffraction theory. On base of the asymptotic solution to this problem the fast algorithms and software are developed for computation of patterns as function of the geometric parameters and electric dimensions of the radiating system. It is shown that, when the distance between dipoles and screen is fixed, the appropriately chosen distance between the dipoles and the appropriately chosen dimensions of the screen provide for the symmetric patterns in the main planes with high directive gain. When the dipoles currents are in quadrature the patterns may be unidirectional. For verification of the calculations, the patterns of the same radiating systems were calculated using commercial software Feko too. The patterns in the main observation planes and the angles of peak-radiation of 3-D patterns are in a good agreement.