Scattering by right angle dielectric wedge
Abstract
An asymptotic solution of electromagnetic waves scattered by a rightangled dielectric wedge for plane wave incidence is obtained. Scattered far fields are constructed by waves reflected and refracted from dielectric interfaces (geometricoptical fields) and a cylindrical wave diffracted from the edge. The asymptotic edgediffracted field is obtained by adding a correction to the edge diffraction of physical optics approximation, where the correction field in the farfield zone is calculated by solving a dual series equation amenable to simple numerical calculation. The validity of this result is assured by two limits of relative dielectric constant epsilon of the wedge. The total asymptotic field calculated agrees with Rawlins' (1977) Neumannseries solution for small epsilon and the edge diffraction pattern is shown to approach that of a perfectly conducting wedge for large epsilon. Calculated farfield patterns are presented, and the accuracy of a physical optics approximation is discussed.
 Publication:

IEEE Transactions on Antennas and Propagation
 Pub Date:
 January 1984
 DOI:
 10.1109/TAP.1984.1143182
 Bibcode:
 1984ITAP...32...61J
 Keywords:

 Antenna Radiation Patterns;
 Dielectrics;
 Electromagnetic Scattering;
 Physical Optics;
 Plane Waves;
 Wedges;
 Asymptotic Methods;
 Far Fields;
 Geometrical Optics;
 Incident Radiation;
 Wave Diffraction;
 Communications and Radar