THE SHIELDING EFFECTIVENESS OF COATED LAM INATED AND NESTED SHIELDS IN A QUASI-STATIC MAGNETIC-FIELD

The present article analyzes the shielding effectiveness of coated, la minated and nested shields. For wavelengths which are long compared wi th the shield dimensions, a two dimensional analytical solution for ar bitrary cross sections is derived considering skin effects. The applic ation of the method to three dimensional shields results in good appro ximations, apart from appreciable errors in the edges. Further, a tran smission line model is presented. Different examples of combinations o f non magnetic and magnetic materials are discussed in detail. Finally , the potential of material savings by multiple shields is investigate d.