Mixed wave-absorbing diffuse reflection metasurface based on metal-graphene composite structure

Abstract

The invention provides a mixed wave-absorbing diffuse reflection metasurface based on a metal-graphene composite structure, and the metasurface is obtained by arranging two coding metasurface units according to an optimal coding sequence, and each coding metasurface unit comprises a substrate dielectric plate, an air layer and a bottom metal grounding plate which are arranged from top to bottom. A metal-graphene mixed distribution structure is printed on the upper surface of the substrate dielectric plate, the metal-graphene mixed distribution structure comprises a metal strip and a graphene thin-film resistor which are connected with each other, and the lengths of the metal strips of the two coding metasurface units are different. According to the mixed wave-absorbing diffuse reflection metasurface, reflected waves are equal in amplitude and reverse in phase, the reflected waves are subjected to cancellation interference to be diffused to a plurality of different directions, meanwhile, the reflected waves are absorbed, the RCS can be effectively reduced, the remarkable stealth effect is achieved, and the mixed wave-absorbing diffuse reflection metasurface has potential application in the fields of stealth cloaks, imaging, wavefront treatment and the like.

Description

technical field [0001] The invention belongs to the technical field of radar stealth and detection, in particular to a hybrid absorbing diffuse reflection metasurface based on a metal-graphene composite structure. Background technique [0002] With the development of radar stealth and detection technology, radar cross section (RCS) has received extensive attention as a measure of the strength of echo electromagnetic signals. At the same time, driven by the need to reduce the risk of being detected, RCS reduction technology has also become a hot spot of attention. RCS is usually reduced by absorption or diffuse reflection. As for the absorption method, traditional radar absorbing materials limit their flexible application in miniaturized and integrated systems due to their large thickness, large volume and fixed frequency band. Absorbing metamaterials composed of subwavelength resonant structures have the advantages of thin thickness, light weight, wide frequency band, larg...

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Problems solved by technology

[0004] At present, although there are studies that can realize high-performance absorbing diffuse reflection metasurface units, considering the stability of the structure, size, assembly difficulty, and processing tolerances, as well as the limitations of three-dimensional or multilayer structures in practical applications, the use of The improvement of RCS reduction achieved by planar single-layer structures remains a challenging task and there is a huge need

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