Use of a Hybrid Method (DFT-GFBM) in the Analysis of Large, Finite Arrays

Ozlem Aydin Civi and Vakur B. Erturk

A novel hybrid method is developed for the fast and accurate analysis of large but finite periodic printed arrays. The developed method hybridizes Generalized Forward Backward Method (GFBM) with a discrete Fourier transform (DFT) based acceleration algorithm to reduce the storage requirements, and to accelerate the CPU time of Galerkin type hybrid Method of Moments (MoM)/Green's function technique (that uses the grounded dielectric slab's Green's function) significantly so that these requirements become linearly proportional with the total number of unknowns. The developed method is first applied to rectangular arrays, and then extended to the analysis of arbitrarily contoured and/or thinned arrays. Numerical results in the form of array current distribution are given for probe fed microstrip patch arrays.