A Broadband Dynamically Tunable RCS Reduction Structure Based on the Combination of Graphene and Gratings

Abstract

The invention provides a broadband dynamically adjustable RCS reduction structure based on the combination of graphene and gratings. The broadband dynamic adjustable RCS reduction structure consists of a bottom metal layer, a dielectric layer, a graphene electric control layer, and a high refraction layer arranged in sequence from bottom to top. Ratio grating layer composition. Among them, the graphene electrical control layer is composed of a high square resistance film layer, an insulating medium layer soaked in ionic liquid and a PET substrate graphene layer. A multi-layer structure is composed of a high-refractive index grating layer and a graphene electrical control layer, and the two methods of radiation loss and absorption loss are combined to expand the RCS reduction bandwidth, and the Fermi level of graphene is adjusted by an external bias to change its direction. resistance, so as to realize the dynamic regulation of the RCS reduction strength in the broadband range. The advantage of the present invention is that on the basis of expanding the RCS reduction bandwidth through the combination of the high refractive index grating layer and the graphene electric control layer, the RCS reduction intensity can be controlled within a broadband range through an external bias voltage, and in a certain state its corresponding All RCS reduction strengths are greater than 10dB.

Description

technical field [0001] The invention relates to the field of dynamically adjustable RCS reduction, in particular to a broadband dynamically adjustable RCS reduction structure based on the combination of graphene and gratings. Background technique [0002] In the past few decades, because of the extremely important role of radar cross-section (RCS) reduction in civilian and military fields, people have conducted extensive and in-depth research on it. So far, there are two main technical means to control the target radar scattering signal intensity: one is to directly absorb and convert incident electromagnetic waves into heat energy or other forms of energy, thereby reducing backscattered energy. Based on this principle, various absorbing structures have been designed, such as: salisbury screen absorber, jaumann absorber and frequency selective surface absorber, etc., which can directly absorb incident electromagnetic waves to achieve RCS reduction. Another RCS reduction tec...

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Problems solved by technology

[0004] In order to solve the problem of narrow bandwidth of dynamically adjustable absorbing wave, the present invention proposes a broadband dynamically adjustable RCS reduction structure based on the combination of graphene and grating, including bottom metal layer, dielectric layer, graphene electrical control layer and high refractive index grating layer; the graphene electric control layer is composed of a high square resistance thin film layer, an insulating medium layer soaked in ionic liquid, and a PET substrate graphene layer. By combining the high refractive index grating layer and the graphene electric control Layers constitute a multi-layer RCS reduction structure, combining radiation loss and absorption loss to broaden the RCS reduction bandwidth, and only by changing the applied bias voltage of the graphene electrical control layer can realize the dynamic regulation of the RCS reduction intensity in the broadband range

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