USAECOM Contributions to Shielding Theory

Abstract
To its three shielding study contracts over the past four years, ECOM contributed the analytical advances required to replace concepts found to be unsatisfactory at the start of the studies, yet still prevalent today. The treatment of oblique incidence was contributed by ECOM; the previous restriction to normal incidence is now rejected. The treatment of shields as circuit elements was originated by ECOM after rejecting, through consideration of Poynting vectors, the concept of high- and low-impedance fields. Thin films have required new techniques to which ECOM has contributed. This paper is written to bring these advances to all specialists in the field so that their talents can be brought to bear on the application or furtherance of these concepts.

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