Shielding Effectiveness Imparted by a Magnetic and Composite Absorber Placed on the Inner-Side of Aperture of Metallic Enclosure

This study introduces a method of using a composite absorber, including a magnetic absorber, to maintain or improve shielding effectiveness, even if the metallic enclosure has unintentional and intentional apertures. The proposed structure places absorbers on the inner side of an enclosure's aperture. The electric fields entering the enclosure through the aperture primarily decrease as they pass through the absorber, degrading the resonance characteristics of the enclosure by an inner absorber, thereby reducing the electric field strength within an enclosure and consequently improving the shielding property. A 3D numerical analysis confirmed the improved shielding property of the enclosure.