Electromagnetic Scattering from Obstacles in the Near Field Region of Electrically Large Arrays

In this paper, an efficient method for the analysis of electromagnetic scattering/radiation from the obstacles nearby electrically large array antennas, with nonuniform excitation, is proposed. The approach is based on the combination of a ray field representation of electrically large arrays and a DFT (Discrete Fourier Transform) based representation of array current distribution. Proposed method is applied to a 2D problem: Radiation of a linear array of 2N+1 infinitely long current elements with tapered current distribution in the presence of an infinitely long PEC (Perfect Electric Conductor) cylinder. Accuracy and efficiency of the method is discussed by numerical examples.