Non-contacting RF shielding device

In combination:

• a first conductive surface for providing electrical shielding;
• a second conductive surface for providing electrical shielding, said second surface having at least a portion thereof continguous with at least a portion of said first conductive surface but not in direct electrical contact therewith, thereby creating an interface area, said interface area allowing the flow of energy therethrough in a given frequency band whereby said shielding is rendered less effective;
• a plurality of elongated conductive stub-like members positioned in said interface area, a first end of each of said stub-like members being directly connected to a common conductive member and each of said stub-like members being spaced at a given distance from at least a portion of said first conductive surface such that said stub-like members and said first conductive surface form a plurality of microstrip lines open-circuited at the second end of each stub-like member remote from said first end;
• each of said stub-like members being dimensioned such that said open circuits at said second ends are transformed into low impedance paths in said given frequency band, said paths effectively occurring between said portion of said first conductive surface and respective points in the vicinity of said first ends of said stub-like members without direct conductive contact between said first conductive surface and said respective points in the vicinity of said first ends of said stub-like members;
• and
• means adapted for coupling said common conductive member to said second conductive surface.