Title :
Electromagnetic diffraction of an obliquely incident plane wave by a right-angled anisotropic impedance wedge with a perfectly conducting face
Author :
Manara, Giuliano ; Nepa, Paolo
Author_Institution :
Dipt. di Inf. Eng., Pisa Univ., Italy
fDate :
4/1/2000 12:00:00 AM
Abstract :
The diffraction of an arbitrarily polarized electromagnetic plane wave obliquely incident on the edge of a right-angled anisotropic impedance wedge with a perfectly conducting face is analyzed. The impedance tensor on the loaded face has its principal anisotropy axes along directions parallel and perpendicular to the edge, exhibiting arbitrary surface impedance values in these directions. The proposed solution procedure applies both to the exterior and the interior right-angled wedges. The rigorous spectral solution for the field components parallel to the edge is determined through the application of the Sommerfeld-Maliuzhinets technique. A uniform asymptotic solution is provided in the framework of the uniform geometrical theory of diffraction (UTD). The diffracted field is expressed in a simple closed form involving ratios of trigonometric functions and the UTD transition function. Samples of numerical results are presented to demonstrate the effectiveness of the asymptotic expressions proposed and to show that they contain as limit cases all previous three-dimensional (3-D) solutions for the right-angled impedance wedge with a perfectly conducting face
Keywords :
anisotropic media; electric impedance; geometrical theory of diffraction; Sommerfeld-Maliuzhinets technique; UTD transition function; arbitrarily polarized electromagnetic plane wave; asymptotic expressions; closed form; electromagnetic diffraction; exterior right-angled wedges; field components; impedance tensor; interior right-angled wedge; loaded face; obliquely incident plane wave; perfectly conducting face; right-angled anisotropic impedance wedge; spectral solution; surface impedance; three-dimensional solutions; trigonometric functions; uniform asymptotic solution; uniform geometrical theory of diffraction; Anisotropic magnetoresistance; Boundary conditions; Conductors; Electromagnetic analysis; Electromagnetic diffraction; Electromagnetic scattering; Electromagnetic wave polarization; Physical theory of diffraction; Surface impedance; Tensile stress;
Journal_Title :
Antennas and Propagation, IEEE Transactions on