Electromagnetic shielding is one of the most widely used techniques to fight against. The shielding effectiveness is the principal performance measure of electromagnetic compatibility in design problems. In this paper we present an analysis of the shielding effectiveness for different materials in function with frequency. We develop a numerical approach to calculate this parameter. This analysis is executed separately for electric, magnetic and electromagnetic fields. We show that all materials are not equivalent to reduce electromagnetic fields. We have also developed an interactive and user interface containing the different configurations used in the calculation of the effectiveness of a shield.
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