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A hybrid uniform geometrical theory of diffraction–moment method for efficient analysis of electromagnetic radiation/scattering from large finite planar arrays
Author(s) -
Çivi Ö. Aydin,
Pathak Prabhakar H.,
Chou HsiTseng,
Nepa Paolo
Publication year - 2000
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/1999rs001922
Subject(s) - method of moments (probability theory) , diffraction , moment (physics) , scattering , uniform theory of diffraction , planar , antenna (radio) , dipole , radiation pattern , mathematics , basis function , optics , mathematical analysis , physics , computer science , classical mechanics , telecommunications , statistics , computer graphics (images) , quantum mechanics , estimator
A hybrid uniform geometrical theory of diffraction (UTD)‐moment method (MOM) approach is introduced to provide an efficient analysis of the electromagnetic radiation/scattering from electrically large, finite, planar periodic arrays. This study is motivated by the fact that conventional numerical methods become rapidly inefficient and even intractable for the analysis of electrically large arrays containing many antenna or frequency‐selective surface (FSS) elements. In the present hybrid UTD‐MOM approach, the number of unknowns to be solved is drastically reduced as compared to that which is required in the conventional MOM approach. This substantial reduction in the MOM unknowns is essentially made possible by introducing relatively few, special ray‐type (or UTD) basis functions to efficiently describe the unknown array currents. The utility of the present hybrid approach is demonstrated here for the simple case of a large rectangular phased array of short and thin metallic dipoles in air, which are excited with a uniform amplitude and linear phase distribution. Some numerical results are presented to illustrate the efficiency and accuracy of this hybrid method.