Double-absorption-peak adjustable metamaterial wave-absorbing body based on liquid crystals

Abstract

The invention discloses a double-absorption-peak adjustable metamaterial wave-absorbing body based on liquid crystals. Each wave-absorbing unit comprises both upper and lower layer medium substrates;liquid crystal layers are injected into gaps between the upper and lower layer medium substrates; a metal resonant unit is arranged on the lower surface of each upper layer medium substrate; each metal resonant unit comprises a plurality of short dipole metal patches which are sequentially connected in series and a plurality of long dipole metal patches which are sequentially connected in series;the plurality of short dipole metal patches which are sequentially connected in series are conected with a first metal electrode by metal wires; and the plurality of long dipole metal patches which are sequentially connected in series are connected with a second metal electrode by metal wires. The double-absorption-peak adjustable metamaterial wave-absorbing body has double absorption frequencies;by powering up different electrodes, the variation of either of absorption peak frequencies can be limited within a small range, and large-range regulation is implemented for the other absorption peak frequency; and according to the double-absorption-peak adjustable metamaterial wave-absorbing body disclosed by the invention, under a perpendicular incident wave, when any one resonant point is regulated, absorptivity of over 93% can still be kept.

Description

technical field [0001] The invention relates to the technical field of metamaterials, in particular to a metamaterial absorber which has double absorption peaks and can adjust the frequency of any one of the absorption peaks while maintaining a high absorption rate for incident waves. Background technique [0002] Metamaterial is a new type of artificially constructed structural material, which has extraordinary electromagnetic properties that natural materials do not have, and provides a new way to manipulate electromagnetic waves. As an important application field of metamaterials, metamaterial absorbers have attracted extensive attention from researchers all over the world. The absorption frequency of traditional metamaterial absorbers is generally a fixed value, which is difficult to change after processing. In recent years, researchers have conducted a lot of research in the direction of frequency-tunable metamaterial absorbers, using graphene, vanadium dioxide and oth...

AI Technical Summary

Problems solved by technology

However, the main problem of current frequency-tunable metamaterial absorbers is that they can only adjust the absorption frequency at a single absorption peak to a limited extent, which greatly limits the practical application of this type of device.

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