Iterative calculation of radial field for efficient source reconstruction from spherical acquisition

Near-field systems have become one of the main tools in antenna measurement. From the most extended acquisition techniques-planar, cylindrical and spherical-it is the spherical acquisition the most versatile one, making possible to obtain the antenna radiation pattern over the entire angular span. A numerical procedure to calculate the equivalent currents representing the radiating structure from a spherical acquisition is presented. It is based on the use of two decoupled integral equations-under consideration of zero value of the radial component of the electric field-solving each integral equation by model estimation.