A formula for efficient computation of radiation from a current source in proximity to cylindrical scatterers

A numerical method used to model the isolated element radiation pattern (IEP) in the EISCAT parabolic cylindrical reflector antenna is presented. The IEP is generated by an isolated dipole above the ground plane and below the beam-forming rods. A two-dimensional field approach was taken after assuming the three-dimensional problem had cylindrical boundaries. The model consisted of an array of dipoles with equal current distributions separable into transverse and longitudinal variables. The impressed current element is defined as a spectrum of current distributions and the total current density is obtained. The radiation field of an element in the vicinity of a number of cylindrical scatterers is then calculated. When applied to the EISCAT antenna good agreement is found between measurements and prediction.