Tunable metamaterial wave absorber based on multiple dielectric materials

Abstract

The invention discloses a tunable metamaterial wave absorber based on multiple dielectric materials. The tunable metamaterial wave absorber structurally comprises a bottom-layer metal reflecting boardand a multilayer structure above the metal board, the multilayer structure comprises three layers of dielectric substrates and resonance units above each layer of dielectric substrate, the resonanceunits coated with high-resistance surfaces are arranged above the first layer of dielectric substrate and the third layer of dielectric substrate, and a solid-state plasma resonance unit is arranged above the second layer of dielectric substrate. The solid-state plasma resonance unit has two working states, namely an excitation state and a non-excitation state. The wave absorber has a very good absorption effect on TE polarized waves and TM polarized waves, by coating the high-resistance surfaces on the resonance units above the first layer of dielectric substrate and the third layer of dielectric substrate, the ultra-wideband absorption of the wave absorber can be realized, and the excitation of different resonance units can be realized by controlling the excitation areas of the resonanceunits formed by the solid-state plasmas in a programming manner, so that the tunable absorption of the wave absorber is realized.

Description

technical field [0001] The invention relates to a wave absorber, in particular to a tunable metamaterial wave absorber based on various dielectric materials, belonging to the fields of radio communication and microwave devices. Background technique [0002] In recent years, the development of novel electromagnetic metamaterials has aroused great interest in the scientific field. New electromagnetic metamaterials are composed of artificial unit structures whose periodic size is much smaller than the operating wavelength (subwavelength). Using the equivalent medium theory, many of its peculiar physical properties can be well analyzed, such as negative refractive index phenomenon, zero refraction Rate phenomenon, inverse Doppler phenomenon, etc., many of which cannot be realized by materials in nature. These unique electromagnetic properties of new electromagnetic metamaterials have great application potential and development space in improving antenna performance, and are wid...

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Problems solved by technology

Compared with traditional wave absorbers, electromagnetic metamaterial wave absorbers are light in weight, thin in thickness, and strong in absorption capacity, and their absorption bands can be adjusted, and the electromagnetic parameters of materials can be designed. Broad application prospects, however, it is difficult to obtain tunable broadband absorption spectrum for metamaterial absorbers in the traditional sense

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