Accession Number:

ADA128639

Title:

Radiation and Scattering from Electrically Small Conducting Bodies of Arbitrary Shape

Descriptive Note:

Technical rept.

Corporate Author:

SYRACUSE UNIV NY DEPT OF ELECTRICAL AND COMPUTER ENGINEERING

Report Date:

1983-01-01

Pagination or Media Count:

117.0

Abstract:

A simple moment solution is given for low frequency electromagnetic scattering and radiation problems. The problem is reduced to the corresponding electrostatic and magnetostatic problems. Each static problem is then solved using the Method of Moments. The surface of the perfectly conducting scatterer is modeled by a set of planar triangular patches. Pulse expansion functions and point machine testing are used to compute the charge density in the electrostatic problem. For the magnetostatic current a new set of charge free vector expansion functions is introduced. The problem is first formulated assuming the scatterer to be in an unbounded homogeneous region. Then the presence of an infinite ground plane is incorporated into the formulation. Scatterers of various shapes, such as the circular disc, the square plate, the sphere, and the cube are studied. Special attention is paid to a conducting box with a narrow slot. The computed results are the scattered fields, the induced charge and current distributions, and the induced electric and magnetic dipole moments. These are in close agreement with whatever published data are available. The electric polarizability of a small aperture in an infinite conducting screen is computed by solving the dual magnetostatic problem of a conducting disc. Five typical aperture shapes including the circle and the ellipse are considered. The results of computations agree well with available exact of measured data.

Subject Categories:

  • Numerical Mathematics
  • Optics
  • Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE