Three-dimensional kirigami metamaterial tunable absorber and its design method

Abstract

The invention belongs to the technical field of metamaterial electromagnetic regulation, in particular to a three-dimensional kirigami metamaterial adjustable wave absorber and a design method thereof. The kirigami metamaterial adjustable wave absorber of the present invention is composed of M*N The metamaterial unit is composed of a periodic extension of the metamaterial unit; the metamaterial unit is a tetrahedron formed by folding and splicing two strips. β Control; each surface is composed of a three-layer structure, wherein the middle layer is PET, the upper and lower sides of the PET are ITO, and the ITO layer is a completely symmetrical double-opening resonant ring. The paper-cut metamaterial adjustable wave absorbing body of the present invention can change the folding angle by changing the folding angle. β , which can realize the mechanical regulation of the electromagnetic wave reflection amplitude (absorption amplitude) under TE polarization and the mechanical regulation of the reflected electromagnetic wave resonance frequency (absorption frequency band) under TM polarization. β When =45°, the excellent function of fully polarized large-angle wide-band wave absorption can be realized; the invention has the advantages of high flexibility and high efficiency.

Description

technical field [0001] The invention belongs to the technical field of metamaterial electromagnetic control, and in particular relates to an adjustable metamaterial absorber and a design method thereof. Background technique [0002] Metamaterials refer to the idea that people simulate the nature of atoms and molecules to form matter, and use sub-wavelength units in a certain arrangement to form periodic or quasi-periodic structures based on electromagnetic theory. Because metamaterials have some physical properties that natural materials do not have, they have been one of the research hotspots of scientists at home and abroad in recent years. The emergence of metamaterials has turned people's dream of radar stealth into reality, and the development of perfect metamaterial absorbers is also very rapid, with bright application prospects. However, in the existing reports, the two major problems of full-polarization, large-angle broadband absorption and adjustability cannot be ...

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Problems solved by technology

However, in the existing reports, the two major problems of fully polarized large-angle broadband absorbing and adjustable are not well resolved, which greatly hinders practical applications.

The full-polarization and large-angle broadband absorption is very challenging. The main reason is that when the oblique incident angle of electromagnetic waves is particularly large, the structure of the metamaterial is equivalent to asymmetry, which cannot guarantee full-polarization absorption. Guaranteed good absorption in one polarization

The second problem of regulation is also very difficult. The tunable metamaterials reported so far are basically based on electronic components. This method is troublesome to manufacture and is very difficult for the process; 3D printing technology, by printing out different molds, the cost is relatively high, and it is not adjustable in essence

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