MODELING AND ANALYSIS OF THE ELECTROMAGNETIC SHIELDING BEHAVIOR OF SUPERCONDUCTORS, CONDUCTORS AND MAGNETIC-MATERIALS

The electromagnetic shielding behavior of thin superconductor films is analyzed using two rigorously-formulated models - a dipole field appl ied to a plane shield, and a planewave falling on a hollow spherical s hield. Here, the electromagnetic response of the superconductor is exp ressed iii terms of complex conductivity. The same models are also app lied to normal conductors both ferromagnetic and non-ferromagnetic, fo r comparison. Computational results show unique characteristics of the superconducting shield, e.g., even a very thin superconductor film sh ows an important shielding, and the frequency characteristics are diff erent from those of ordinary materials. To enable the computation of a n arbitrary 3-D shape, a new impedance formulation for thin supercondu cting boundary is introduced. The superconducting sphere model is anal yzed and verified by comparison with the exact solution.