RADIO-ABSORBING DIFFRACTION GRATING-BASED COATING Russian patent published in 2017 - IPC H01Q17/00 

FIELD: radio engineering, communication.

SUBSTANCE: diffraction grating-based coating is made of electroconductive or dielectric material, containing radio-absorbing elements. Coating includes groups containing, at least, four slots, each slot in the group is parallel to each other, each group is perpendicular in relation to the other group. Slots have a distance between adjacent elements from one sixteenth to one quarter of the length of the incident electromagnetic wave. Inside the slot there are not less than four layers of aramid fabric that are not interconnected, with a magnetron sputtered film of hydrogenated carbon with nanoclusters of metal atoms. The coating is protected from below from external exposure by metal foil, and from above - by means of a radio-transparent layer with a thickness of, at least, 0.1 mm. The above layers of aramid fabric with a magnetron sputtered film of hydrogenated carbon with nanoclusters of metal atoms are radio-absorbing elements.

EFFECT: increasing the stealth and reducing the likelihood of detecting objects of sea, land, aviation and space equipment by radar, ensuring the electromagnetic compatibility of radioelectronic and radio engineering devices and units, increasing the efficiency of absorbing electromagnetic radiation over a wide range of wavelengths.

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