RF filter device for aircraft nacelle access door gap

An assembly for electromagnetic interference shielding of an interior of an aircraft, comprising:

• a first external surface and a second external surface having an inner surface, the first external surface being contiguous with the second external surface and defining a gap therebetween;
• a deflector plate located in the interior and having a gap-facing surface parallel to and opposite from the inner surface of the second external surface;
• and
• a first shielding located on the inner surface of the second external surface, the first shielding including a first electromagnetic band gap structure.

Electromagnetic interference shielding, comprising:

• an electromagnetic band gap structure including:
• an array of unit cells across a length and a width, each unit cell comprising:
• a flat conductive patch parallel to the length and width;
• each patch having an inner surface;
• and
• a conductive via connected to the inner surface of the patch;
• a conductive ground layer having an inner surface and an outer surface;
• the conductive via extending from the patch to the inner surface of ground layer;
• a substrate layer of dielectric material located between the patches and the ground layer;
• and
• a conductive adhesive layer connected to the outer surface of the ground layer.