Light, multi-layer, screening textiles with a high capacity for absorbing electromagnetic fields in the high frequency range

Abstract

Abstract This paper concerns multilayer, shielding textile-polymeric materials with a high shielding effectiveness. This effectiveness is characterised by a high capability to absorb electromagnetic fields as a result of intensification of multiple internal reflections at the boundaries between the layers of component materials. These new shielding materials present low thicknesses and surface weights, amounting to 1.0–2.0 mm and 190–420 g m− 2, respectively, depending on their structures. Such materials composed of various structures, containing various functional particles, meet high requirements of shielding effectiveness within the frequency range tested from 8.0 to 18.0 GHz. Their absorption coefficient is at a level of ≥ 30%, and in some structures it even exceeds 90%, while the reflection coefficient is ≤ 20% and that of transmission amounts to as low as ≤ 20%, approaching even below 2%.