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Electromagnetic Scattering by Anisotropic Impedance Half and Full Planes Illuminated at Oblique Incidence
No full textThe three-dimensional electromagnetic (EM) scattering from
half and full plane configurations, both characterized by a perfectly conducting
and an anisotropic impedance face, is analyzed. The anisotropic
impedance boundary condition considered for the loaded face is suitable
for modeling corrugated surfaces or strip-loaded grounded dielectric
slabs used to realize artificially hard or soft surfaces, with a tensor surface
impedance exhibiting a vanishing impedance along the corrugations or
strips and a diverging impedance in the orthogonal direction. Previous
rigorous solutions, valid when the vanishing impedance direction is either
parallel or perpendicular to the edge, are generalized here to the case in
which the direction of vanishing impedance is arbitrarily oriente
UTD diffraction coefficients for an edge in a periodic strip grating illuminated at oblique incidence
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EM Scattering from the Edge of a Semi-Infinite Planar Strip Grating Using Approximate Boundary Conditions
No full textElectromagnetic scattering by the edge of a semi-infinite, dense planar grating of free-standing metallic strips is analyzed. The grating is illuminated by an arbitrarily polarized plane wave impinging on its edge at oblique incidence. The strips can be arbitrarily oriented with respect to the edge. An equivalent canonical problem is defined by adopting for the strip grating well-known approximate boundary conditions derived in the framework of homogenization techniques. The exact spectral solution for the above canonical problem is deduced by the application of the Sommerfeld-Maliuzhinets method, and explicitly depends on the grating parameters. The spectral solution is defined along the Sommerfeld integration contour and can be evaluated asymptotically to derive high-frequency expressions for the diffracted field. Some numerical results are presented to show that the above solution predicts a non vanishing diffracted field for any incident field polarization, and smoothly converges to the known solutions for both the perfectly conducting half-plane and the unidirectionally conducting half-plane, which are contained in the adopted strip-grating model as limit cases
EM scattering by metallic half plane loaded by anisotropic face with arbitrarily oriented anisotropy axes
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Validation of a Class of Heuristic Diffraction Coefficients for Edges in Penetrable Anisotropic Screens
No full textUTD coefficients for edges in artificially hard and soft surfaces illuminated at oblique incidence
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