An electromagnetic screen having a high surface impedance, the screen comprising: a flat metal reflector substrate; and two capacitor-type lattices located above the reflector substrate, wherein the capacitor-type lattices comprise: a first dielectric layer on the reflector substrate; a first thin metal layer on the first dielectric layer, the first thin metal layer comprising a plurality of pieces that are spaced apart from each other by a period; a second dielectric layer on the first thin metal layer; a second thin metal layer being arranged in parallel with the first thin metal layer and on the second dielectric layer, the second thin metal layer comprising a plurality of pieces that are spaced apart from each other by the period, the pieces of the second thin metal layer being shifted from the pieces of the first thin metal layer on a share of the period in a direction parallel to the flat metal reflector substrate; and wherein the electromagnetic screen is an artificial magnetic conductor; characterized in that at least one of lateral edges of the lattices has an electric connection with an edge of the reflector substrate; and the electric connection comprises a first connector that connects a first edge of the first thin metal layer to a first edge of the reflector substrate, the first connector being disposed on a first outermost surface of the first dielectric layer. a flat metal reflector substrate; and two capacitor-type lattices located above the reflector substrate, wherein the capacitor-type lattices comprise: a first dielectric layer on the reflector substrate; a first thin metal layer on the first dielectric layer, the first thin metal layer comprising a plurality of pieces that are spaced apart from each other by a period; a second dielectric layer on the first thin metal layer; a second thin metal layer being arranged in parallel with the first thin metal layer and on the second dielectric layer, the second thin metal layer comprising a plurality of pieces that are spaced apart from each other by the period, the pieces of the second thin metal layer being shifted from the pieces of the first thin metal layer on a share of the period in a direction parallel to the flat metal reflector substrate; and a first dielectric layer on the reflector substrate; a first thin metal layer on the first dielectric layer, the first thin metal layer comprising a plurality of pieces that are spaced apart from each other by a period; a second dielectric layer on the first thin metal layer; a second thin metal layer being arranged in parallel with the first thin metal layer and on the second dielectric layer, the second thin metal layer comprising a plurality of pieces that are spaced apart from each other by the period, the pieces of the second thin metal layer being shifted from the pieces of the first thin metal layer on a share of the period in a direction parallel to the flat metal reflector substrate; and wherein the electromagnetic screen is an artificial magnetic conductor; characterized in that at least one of lateral edges of the lattices has an electric connection with an edge of the reflector substrate; and the electric connection comprises a first connector that connects a first edge of the first thin metal layer to a first edge of the reflector substrate, the first connector being disposed on a first outermost surface of the first dielectric layer.