Accession Number:

AD0420911

Title:

DIFFRACTION BY COMPOSITE CYLINDERS,

Descriptive Note:

Corporate Author:

BROWN UNIV PROVIDENCE R I

Personal Author(s):

Report Date:

1963-06-01

Pagination or Media Count:

96.0

Abstract:

The diffraction of electromagnetic waves by a cylindrical obstacle is described. Attention is confined to two dimensional monochromatic waves with longitudinal magnetic fields. The obstacle is specified as having a perfectly conductive core surrounded by a dielectric coating. Both the core and coating are of an arbitrary shape. Lossy, inhomogeneous and anisotropic dielectrics are included in the analysis. Under these conditions an integral equation is formulated to determine the field, especially the current distribution on the conducting core. From this equation it is deduced that, if the solution for the corresponding simple conducting cylinder is known, then the perturbed current distribution due to the dielectric coating can be expressed as definite integrals in two limiting cases of Thin dielectric and Low refractive index. The general perturbation formulas thus developed are applied to the special case of a plane wave incident upon a circular cylinder with a radially symmetric coating. The result, which is also the radiation pattern of the corresponding slot antenna, is expressed as a linear combination of certain functions which depend only on the normalized radius of the core. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE