Electromagnetic transmission through an aperture of arbitrary shape in a conducting screen
Abstract
In this work the problem of electromagnetic transmission through an arbitrarilyshaped aperture (undercovered) or window (covered with a thin glossy dielectric sheet) in a perfectly conducting plane is treated. The method of moments is used to solve numerically the integral equation for the equivalent magnetic current. Triangular patching is used to conform to the arbitrary shape. Local position vectors are chosen as both the expansion functions and the testing functions. The centroidpair matching is utilized to complete the approximation. A set of computer codes is presented and briefly described. To illustrate the solutions, computations are given for various apertures (different shapes), windows (different dielectric materials), and half spaces (different media). Numerical results are also compared with other data, if available. For windows with proper thickness or half spaces with proper media, the phenomenon of aperture resonance is demonstrated.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 April 1982
 Bibcode:
 1982STIN...8232588I
 Keywords:

 Apertures;
 Electromagnetic Wave Transmission;
 Integral Equations;
 Magnetic Properties;
 Shapes;
 Computer Programs;
 Current Distribution;
 Dielectric Properties;
 Expansion;
 Half Spaces;
 Method Of Moments;
 Communications and Radar