Radial mode matching analysis of dielectric-loaded wedges, slots and strips

Abstract

An efficient rigorous solution for the electromagnetic (EM) wave scattering by a wedge with concaved edge, double wedge with concaved edges, multislotted circular cylinder and strips are formulated for a line source or plane wave excitation. The bulk of this dissertation deals with the solutions based on the radial mode matching technique for analyzing normal and oblique scattering by wedges, slots and strips. First, E - and H - polarized electromagnetic scattering problems by a perfectly conducting wedge with concaved edge are formulated for a line source or plane wave excitation using radial mode matching technique. The scattered and guided fields are represented in terms of an infinite series of radial waveguide modes with unknown coefficients. By applying the appropriate boundary conditions, the coefficients of scattered field are obtained. For a small radius of concaved edge, the diffraction coefficient of concaved edge is subsequently derived from the scattered field. Second, An exact series solutions for the normal or oblique scattering by a pair of parallel concaved edges of perfectly conducting wedges are formulated for E - and H - polarization using the radial mode matching technique. In order to check the accuracy of present method, a slit is chosen for calculations as a special case of double edges structure. Diffraction coefficient for double edges of perfectly conducting half planes is derived from the scattered field and presented in series form. We also investigate the effect on the transmission coefficient due to dented edges with dielectric cylinder. Finally, electromagnetic penetration through and scattering from an infinite, multislotted circular cylinder with thickness are formulated for E - and H - polarized wave using radial mode matching technique. Also, an exact series solution is given for the problem of electrcmagnetic transmission through dielectric-filled multislot in a thick conducting cylinder shell. The exciting source is an e...