Diffraction of plane waves by a two-impedance wedge in cold plasma

ABSTRACT MSc THESIS DIFFRACTION OF PLANE WAVES BY A TWO-IMPEDANCE WEDGE IN COLD PLASMA Filiz KARAOMERLİOGLU DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING INSTITUTE OF NATURAL AND APPLIED SCIENCES UNIVERSITY OF ÇUKUROVA Supervisor : Asst. Prof. Dr. Turgut İKİZ Year: 2001 Pages: 53 Jury : Asst. Prof. Dr. Turgut İKİZ Prof. Dr. A. Hamit SERBEST Asst. Prof. Dr. Caner ÖZDEMİR A wedge is an important canonical structure in diffraction theory. Practically a two-impedance wedge in a cold plasma may be used in modelling the electromagnetic scattering from a variety of large and complex objects. In this study, the scattered field is represented in the form of a Sommerfeld integral with an unknown spectral function. By using the impedance boundary conditions a nonhomogeneous functional equation is obtained. The solution of the functional equation can be represented in terms of ?-functions and S integrals. After determining the unknown spectral function in the Sommerfeld integral, the Sommerfeld contour is deformed into the steepest descent paths. Diffraction coefficients are also discussed. During the deformation process the geometrical optics wave contributions is found. Keywords : Electromagnetic wave diffraction, Two-impedance wedge, Cold plasma, Sommerfeld integral, Steepest descent paths