Patent ID: 8921710

Claim:
An electromagnetic shielding configuration comprising: a first electrically conductive wall having a first edge; and a second electrically conductive wall having a second edge that is substantially a conjugate of the first edge, the first edge being oppositely disposed from the second edge and the interfacing of the first edge and the second edge forming an enclosure wall, wherein: the first edge comprises a raised surface that is substantially flat, a stepped surface substantially perpendicular and adjacent to the raised surface, and a corrugated surface substantially perpendicular and adjacent to the stepped surface and laterally displaced from the raised surface, the corrugated surface comprising a series of apices extending from a base of the corrugated surface, the height of the corrugations between the base and the apices being less than the height of the stepped surface between the apices and the raised surface; the first edge is configured to interface with the second edge to form a two stage filter; the two stage filter includes a first stage configured to polarize electromagnetic radiation and a second stage configured to block the polarized electromagnetic radiation; and one of the first stage and the second stage includes a vertical barrier having the height of the stepped surface between the apices and the raised surface.