Extension of Gaussian Beam Techniques for the Rapid Analysis of Electromagnetic Radiation/Scattering from Dielectric Reflector Antennas

Abstract

A highly efficient Gaussian beam (GB) method was recently developed to provide a relatively rapid analysis of large, perfectly conducting reflector antennas. This GB method is very efficient because it represents the feed radiation in terms of a set of very few rotationally symmetric GBs and provides an essentially closed form solution for the reflection and diffraction of each GB incidence on the reflector surface. This method completely avoids the time-consuming numerical integrations in the evaluation of radiated fields over the large reflector surfaces that are generally required in conventional approaches of the physical optics and aperture integration techniques. This paper extends previous works to treat reflector antennas with dielectric surfaces that derive from many practical applications, including, for example, the analysis of the scattering from sub-reflectors having frequency selective surfaces in a dual-reflector antenna system. Numerical examples are used to validate this extended GB approach.