| 摘要 |
A protective screen adapted for restricting and/or reducing the amount of radiation passing therethrough, said radiation including both RF and EMF components, characterised in that the screen is of laminar construction and comprising at least two laminae of differing materials, a first of said materials being chosen so as to attenuate RF radiation passing therethrough, and the second material being capable of having an electric and/or a magnetic field induced therein as a result of the existence of an EMF source, said induced electric and/or magnetic fields giving rise to destructive interference with the original inducing EMF thus reducing the resulting amplitude of EMF on the side of the screen being more remote from the EMF source. Ideally the first material is Copper and the second material is a strongly dia - or paramagnetic compound or element. |
