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This paper presents a uniform geometrical theory of diffraction (UTD) for describing the electromagnetic (EM) scattering from finite, quasi periodic, planar arrays illuminated by incident spherical waves. It is applied here to analyze the scattering by a finite frequency selective surface (FSS), and by a finite reflectarray, respectively when they are excited by a nearby antenna. The UTD yields not...
The uniform geometrical theory of diffraction (UTD)-type analysis of electromagnetic (EM) scattering from an array of periodic structures is presented, whose solutions were developed by an extension from the analogous 2-D EM scattering problem. The array is semi-infinite along one of its two dimensions. The scattering fields are interpreted by the diffraction mechanisms of the UTD framework including...
This paper presents the UTD-type solution for the electromagnetic scattering from a periodic structure, analogous to the conventional UTD solution for the scattering from electrically large scatterers. The solution was built up based on Kirchhoff approximation of equivalent currents from a unit cell, within which the structure can be arbitrary. This solution provides a convenient way to interpret...
The scattering mechanisms of reflecting arrays illuminated by the radiation of line source are summarized for a general near-field focus problem. In particular, the phenomena are interpreted by the ray decompositions of Floquet waves and result in the solutions, analogous to the ordinary UTD-type formulations for the phased array antennas with a proper parameter mapping. The ray phenomena however...
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