Shielding Density: An Electromagnetic Shielding Design Concept for Weight Sensitive Applications

Laboratory data obtained in a shielding study led to the conclusion that the size or shape of a shielding enclosure does not significantly affect its shielding effectiveness at frequencies below cavity resonance. A figure-of-merit expression for weight-sensitive applications was devised and termed shielding density. It relates shielding effectiveness per unit weight per unit area. This concept is useful in providing the shield designer with answers to three specific questions concerning maximum shielding effectiveness, lightest shielding enclosure, and optimum shielding density.