A sheet impedance approximation for electrically thick material shields

Author

Newman, Edward H.

Author_Institution

ElectroScience Lab., Ohio State Univ., Columbus, OH, USA

Volume

50

Issue

4

fYear

2002

fDate

4/1/2002 12:00:00 AM

Firstpage

435

Lastpage

443

Abstract

This paper describes a simple extension of the sheet impedance concept to treat electromagnetic (EM) shields that may be thick in terms of material shield wavelengths. For magnetic shields, a simple relation between the equivalent electric and magnetic currents representing the shield is obtained, and the electric current is found as the solution of a single surface integral equation that is shown to be a simple perturbation of that for a perfect electric conducting (PEC) surface. Finally, it is shown that the computation of the small interior fields of good shields requires the use of the proper PEC interior equivalent problem

Keywords

electric current; electric impedance; integral equations; magnetic shielding; method of moments; EM shields; PEC surface; electrically thick material shields; electromagnetic shields; equivalent electric currents; integral equation; interior fields; magnetic currents; magnetic shields; material shield wavelengths; method of moments; perfect electric conducting surface; sheet impedance approximation; simple perturbation; Conducting materials; Current; Electromagnetic scattering; Electromagnetic shielding; Integral equations; Magnetic materials; Magnetic shielding; Sheet materials; Surface impedance; Surface treatment;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.2002.1003378

Filename

1003378