Extension to a hybrid UTD-MoM approach for the efficient analysis of radiation/scattering from tapered array distributions

Summary form only given. A hybrid method, which combines the UTD ray technique with the numerical MoM approach has been developed to provide a relatively efficient analysis of EM radiation/scattering from an electrically large, planar, periodic, finite array. In this paper, an extension of the hybrid UTD-MoM approach of Aydin Civi, Pathak and Chou (see URSI EMT meeting, Thessaloniki, Greece, May 1998) is presented to deal with tapered array distributions, as well as periodic arrays that may support more than one propagating Floquet mode (although most array designs allow only one propagating Floquet mode to exist within the operating frequency band). In this hybrid UTD-MoM method, an integral equation formulation for the unknown currents on the array elements is solved within the MoM framework in a relatively efficient manner by essentially introducing only a few appropriate UTD-type global basis functions to describe the functional form of the unknown array element weights.