Electromagnetic characterization of conductive magnetic/non-magnetic shielding materials

Abstract

The theory of shielding was developed mostly on the basis of transmission lines model, using the Schelkunoff-Schulz isomorphism. The paper uses the transmission line theory but abandons the isomorphism that led to theory vs. experiments mismatch. The new model assumes transversal capacitive coupling between the sample under test and the coaxial TEM measuring cell. Thus, occurrence of higher modes inside the tested material at high frequencies is avoided, and experimental curves IL=F(/spl omega/) validate theoretical predictions.