PROTECTIVE COATING (ALTERNATIVES) Russian patent published in 2007 - IPC H01Q17/00 H05K9/00 

FIELD: radio electronics.

SUBSTANCE: proposed protective coating that can be used in developing and operating devices designed to confine electromagnetic radiation of instruments and to protect electronic equipment, information media, and biologic entities against high-level electromagnetic radiation has flexible film with surface impedance layer disposed on incident electromagnetic wave side. Film of first design alternate is made in the form of ribbon interwoven into reticular warp to form hold stitch in each cell; reticular warp cell width amounts to (0.1 - 1)λ, where λ is mean length of operating-range electromagnetic wave; reticular warp cell width, hold stitch radius, and film width are interrelated as follows: (0.8-1.5) : (1-2) : (0.6-2.7), respectively. Coating of second design alternate has embossed surface formed by uniformly alternating projections or cavities. Processes of multiple reflection of incident waves from embossed outer surface of coating are noted along with those of electromagnetic wave absorption caused by magnetic and electromagnetic loss in impedance layer of film. Transfer to new frequency band is attained by changing geometry of embossed outer surface basing on same type of film.

EFFECT: facilitated manufacture, enhanced efficiency of protection against electromagnetic radiation, reduced mass and size.

2 cl