A THz ultra-wideband microwave absorber based on unequally spaced stack structure

Abstract

The invention discloses a THz ultra-wideband microwave absorber based on an unequal-spacing laminated structure, comprising a reflecting plate and a dielectric body above the reflecting plate, whereinthe dielectric body is tapered, and at least one layer of metal resonant units periodically arranged by structural units is arranged inside the dielectric body; The metal resonant unit is centrosymmetrical and consists of three metal patches, comprising a hexagonal ring structure of the outer layer, a ring structure of the middle layer and an X-shaped broken line structure of the inner layer. Theinvention is designed based on the principle that the absorption frequency band can be broadened by the multilayer structure, which breaks through the traditional design idea that the layer spacing is equal, and adopts a laminated structure with unequal spacing to widen the absorption frequency domain to realize the ultra-wideband absorption of the THz band.

Description

technical field [0001] The invention relates to an ultra-broadband wave absorber, in particular to a THz ultra-broadband wave absorber based on a stacked structure with unequal spacing, and belongs to the technical fields of radio communication and THz devices. Background technique [0002] Metamaterial is an artificial composite structure or composite material with extraordinary physical properties, such as negative permittivity, negative magnetic permeability, etc., and the size of the metamaterial is much smaller than its working wavelength. Initially, when electromagnetic waves propagate in metamaterials, unlike traditional materials, they satisfy the left-handed spiral rule instead of the right-handed spiral rule, so they are called left-handed materials. With the continuous advancement of research, people found that due to the special physical properties of left-handed materials, they have wider application prospects, which has aroused extensive attention and research ...

AI Technical Summary

Problems solved by technology

Absorbers designed with conventional materials have disadvantages such as large volume, high mass, and poor stability, and the use of metamaterials to design absorbers can well avoid these shortcomings

It was first proposed in 2002 that a lossy FSS (frequency selective surface) could be used to design an ultra-thin absorber, but the design method of this absorber is too cumbersome to be widely used

With the continuous development of modern science and technology, various electronic products emerge in an endless stream, and the impact of electromagnetic radiation on life is increasing. Aircraft may be affected by electromagnetic radiation to take off normally, and various electronic diagnostic instruments in hospitals may be affected by electromagnetic radiation. Normal use

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