Metamaterial based screening box working from DC up to the GHz range

Metamaterials that present electromagnetic band-gaps have found many applications in solving signal integrity issues. In particular, inserting a metamaterial in a metal screening box prevents launching of cavity modes within the frequency range of the electromagnetic band-gap(s) and avoids in this way the necessity of insertion of resistive layers. We propose a solution for building a metal screening box working from dc up to several GHz and that may be used for packaging microwave circuits that occupy a certain space around the long axis of the box, such as directional couplers.