Preparation and application of broadband light metamaterial wave-absorbing structure

Abstract

The invention relates to a broadband light metamaterial wave-absorbing structure and preparation and application thereof. A structure unit of the metamaterial is a mosquito-repellent incense-shaped hollow pattern with the size being 1 to 3 cm, and the structural unit is distributed in a two-dimensional array of 5*5, 8*8 and 14*14 on a substrate of 180*180 mm. A microwave absorbing material is formed by mixing an absorbent and paraffin according to a certain mass fraction and is filled into a hollow gap of an FR4 or polytetrafluoroethylene substrate with the metamaterial. The metamaterial wave-absorbing structure has a remarkable wide frequency-light microwave absorption effect, wherein the effective bandwidth smaller than -10 dB is 3.5 to 16.8 GHz within the frequency range of 1 to 40 GHz;the surface density is 0.081 to 0.932 kilogram per square meter and the thickness is 0.5 to 2 mm. The structure is novel in design idea and has a broadband-light wave-absorbing characteristic, a preparation process is simple, raw materials are cheap and easy to obtain, the cost is low, and the structure is easy to apply and popularize, and furthermore, the obtained metamaterial has wide application prospect in the fields such as a microwave stealth technology, antenna, security check, thermal radiation detection, thermal radiation imaging, nondestructive detection and the like.

Description

technical field [0001] The invention relates to the field of electromagnetic functional materials, in particular to a method for designing, preparing and using a broadband lightweight metamaterial wave-absorbing structure. Background technique [0002] Absorbing materials are a type of functional materials that can effectively absorb incident electromagnetic waves and reduce the intensity of target echoes. Most of the traditional absorbing structures are designed based on the principle of the Salisbury absorbing screen, and the typical problems are that the volume is too large, the absorption frequency band is narrow, and the density is high. For traditional absorbing structures, the method of broadening the absorption frequency band is usually to increase the content of the absorber or increase the thickness of the material, but correspondingly, it will also bring disadvantages such as increased mass and reduced mechanical properties, which is difficult to meet actual needs...

AI Technical Summary

Problems solved by technology

The metamaterial wave-absorbing structure absorbs electromagnetic waves through electromagnetic resonance, so the absorption frequency band is relatively narrow. Although single-frequency and multi-frequency absorption can also be achieved through the resonance principle, it is still necessary to achieve broadband absorption and light-weight absorbing materials. There is a certain degree of difficulty, so it is of great potential value to study metamaterial absorbing structures with wide absorption frequency band, good absorption effect and light weight.

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