Transparent Substrate Comprising A Stack of Thin Layers for Electromagnetic Armour
An article comprising a transparent substrate has been issued a patent. It has a thin-film multilayer comprising three silver layers (Ag1, Ag2, Ag3) and alternately on the substrate, a titanium dioxide layer, a metal oxide layer, one of the silver layers (Ag1, Ag2, Ag3) and a covering layer. An antireflection layer comprises at least one metal oxide and is deposited on the covering layer for the silver layer (Ag3) furthest away from the substrate. The metal oxide is zinc oxide; the covering layer is a sacrificial metal; and the thicknesses (eAg1, eAg2, eAg3) of the silver layers (Ag1, Ag2, Ag3) vary in a ratio of between 0.8 and 1.2 and are such that eAg1≤eAg3≤eAg2 and eAg1 corresponds to the thickness of the silver layer closest to the substrate and eAg3 corresponds to the thickness of the silver layer furthest from the substrate.