Accession Number:

AD0632809

Title:

ON THE THEORY OF SCATTERING BY AN ARBITRARY ARRAY OF FINITE LENGTH PARALLEL WIRES,

Descriptive Note:

Corporate Author:

OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS ANTENNA LAB

Personal Author(s):

Report Date:

1966-02-01

Pagination or Media Count:

33.0

Abstract:

It has been shown previously AD-443 833, AD-463 370, AD-467 888 that a continuous cylindrical metallic surface could be approximated by an array of infinitely long thin wires in order to obtain the far-zone scattered field. Such a technique found useful application in predicting the far-field pattern in the horizontal plane of a thin vertical antenna near a vertical cylindrical scatterer in many, but not all, situations. For instance, valid results could be obtained only if the scatterer was on the order of twice as tall as the antenna, and even then only in the azimuthal plane. As a result it was decided to use wires of finite instead of infinite length to approximate metallic cylinders of finite height. Since the current on each finite wire is non-uniform, it is necessary to represent the current by a Fourier series, the coefficients of which are determined by forcing the total tangential electric field to vanish at several points along each wire. This generates a system of linear equations which can readily be solved on a digital computer for the Fourier coefficients. Some representative calculated and experimental results are presented which show the general validity of the approach. In addition, methods for substantially reducing the running time of the program on the computer are explained. Author

Subject Categories:

  • Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE