Dielectric-based broadband tunable metamaterial wave-absorbing body

Abstract

The invention discloses a dielectric-based broadband tunable metamaterial wave-absorbing body and relates to the field of wave-absorbing materials and metamaterials. An electromagnetic wave-absorbingunit is formed by combining a soil material with a dielectric substrate on which a conductive thin film is pasted; and impedance matching is achieved through the electromagnetic wave-absorbing unit and a free space to achieve a relatively good wave-absorbing effect. The metamaterial wave-absorbing body is formed by periodically arranged wave-absorbing units and comprises the dielectric substrate,the soil material and the conductive thin film clung to the dielectric substrate. Square holes which are circular in inside are firstly engraved into the dielectric substrate, and then the soil material is embedded into the holes of the dielectric substrate and is in contact with the conductive thin film. By using the characteristic that the soil material has a high dielectric loss along with thechange of the water content in a microwave frequency band, the wave-absorbing bandwidth can be significantly increased under the condition of a relatively small thickness; main raw materials are easyto obtain and the metamaterial wave-absorbing body is eco-friendly, simple in structure, mature in preparation process, low in cost and suitable for large-scale production; and the wave-absorbing effect of the metamaterial wave-absorbing body can be adjusted through changing the water content of the soil material, so that operation is more convenient and concise.

Description

technical field [0001] The invention belongs to the field of wave-absorbing materials and metamaterials, and more specifically relates to a medium-based broadband adjustable metamaterial wave absorber. Background technique [0002] Metamaterials refer to artificial composite structures or composite materials with extraordinary physical properties that natural materials do not possess. It should have three important characteristics: (1) It is usually a composite material with a novel artificial structure; (2) It has extraordinary physical properties; (3) It is often not mainly determined by the essential properties of the constituent materials, but by the artificial structure in it . In recent years, the definition proposed by Professor Zhou Ji of Tsinghua University from the structure of its materials, that is, materials that realize their characteristics through artificially designed functional units, no longer reflects the requirement of "extraordinary properties that nat...

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a dielectric-based broadband tunable metamaterial absorber, thereby solving the complex structure and anisotropy of the traditional metal-based metamaterial absorber, thereby technical issues that limit the practical application of such metamaterials

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