Elements of a Topological Barrier for Electromagnetic Interference Control

Although an ideal, topologically closed barrier cannot be achieved, compromises in a barrier can be identified and minimized. This paper discusses the construction of a practial barrier. Untreated pene­ trations are the most serious compromise, followed by apertures and a usually negligible amount of diffu­ sion. In the application of topology to interference control, the establishment of a barrier that is effec­ tively impervious to electromagnetic energy is pos­ sible.