Metamaterial wave absorber

Abstract

The invention discloses a metamaterial wave absorber which is composed of a plurality of periodic units, and each periodic unit comprises a metal layer located at the bottommost layer, a dielectric layer located over the metal layer and a mixed layer composed of a metal patch and a semiconductor material and located over the dielectric layer. The mixing layer is located over the dielectric layer,the other parts, except the metal patch, of the mixing layer are filled with a semiconductor material, and a gap is formed between the semiconductor material and the metal patch structure; when electromagnetic waves enter the surface of the metamaterial wave absorber, electromagnetic coupling interaction is generated between the metal patch and the semiconductor material. By reasonably designing the periodic size and geometric parameters of the unit structure, perfect absorption of electromagnetic waves with a certain specific frequency can be realized. The metamaterial wave absorber is simplein structure, small in size, wide in frequency band, high in absorption and the like, and has the advantages of being wide in incident angle, insensitive to polarization and the like for incident electromagnetic waves.

Description

technical field [0001] The invention relates to the technical field of electromagnetic wave absorption and shielding, in particular to a metamaterial wave absorber. Background technique [0002] In recent years, due to its novel physical effects and potential application value, metamaterials have received extensive attention and have been applied in many new fields such as negative refraction materials, invisibility cloaks, perfect lenses and so on. According to the equivalent medium theory, the electromagnetic properties of metamaterials are expressed by equivalent permittivity and equivalent permeability. By rationally designing the period size and geometric parameters of the metamaterial, it can generate electric resonance and magnetic resonance with the incident electromagnetic wave, so as to control its equivalent permittivity and equivalent permeability accordingly. Through the modulation of the equivalent permittivity and equivalent permeability of the metamaterial, ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a metamaterial absorber to solve the problems of narrow working bandwidth, sensitivity to incident electromagnetic wave polarization direction and low incident angle of traditional metamaterial absorbers

Images