Scattering of directed radiation by a cylinder

✍ Scribed by Zitron, N. R. ;Davis, J.

• Publisher: Springer
• Year: 1968
• Tongue: English
• Weight: 300 KB
• Volume: 18
• Category: Article
• ISSN: 0003-6994
• DOI: 10.1007/bf00382353

✦ Synopsis

A new asymptotic method of Karp and Zitron is employed to study the effect of tile directivity of a source on the scattering pattern when the radiation emanating from the source is incident upon a circular cylinder. Numerical results are obtained and presented graphically when the source is a slotted cylinder for the case of H-polarization. § 1. Introduction When radiation from a cylindrical source is incident upon a cylindrical scatterer, the wave incident upon the scatterer and, consequently, the scattered wave will depend on the distance between the source and the scatterer. If e.g. the spacing is infinite the incident wave will be a plane wave. If the spacing is large, but not infinite, the incident wave is equivalent to an isotropic cylindrical wave emanating from a line source or an equivalent isotropic source. As the source is brought closer to the scatterer the directivity of the source, which gives rise to a curvature of the wavefront, must be considered.

The uncertainties in results based on a plane wave assumption are discussed by Kodis Eli, Wiles and McLay [2], Subbaro and McLay E3], and King and Wu [4]. The first step beyond the plane wave approximation, namely the line source, has been treated elsewhere by the authors [5] and by others E6, 7]. In this paper the authors deal with the more general case of a source with a di-*