A metamaterial with switchable transmission/reflection and adjustable amplitude

Abstract

The invention discloses a superstructure material with switchable transmission / reflection and adjustable amplitude. The superstructure material is a layered structure, which includes an active frequency selective surface, a microwave dielectric layer and a graphene capacitor layer from bottom to top. . Among them, the active frequency selective surface is composed of a dielectric substrate and periodic metal microstructure patterns printed on both sides of the dielectric substrate, and PIN diodes are loaded in the metal microstructure. The microwave dielectric layer is a commonly used wave-transmitting material in the microwave segment. The graphene capacitor layer is composed of a high square resistance film layer, an insulating dielectric layer soaked in ionic liquid, and a single-layer graphene layer on a PET substrate. The advantage of the present invention is that by controlling the on-off of the PIN diode, the dynamic switching of transmission and reflection modes can be realized, and the square resistance of graphene can be changed by adjusting the Fermi energy level of graphene through an external bias voltage, and the transmission amplitude and reflection amplitude can also be realized dynamic tuning. The metamaterial in the present invention has full polarization response characteristics, integrates multiple electromagnetic control functions, and has a simple structure and is easy to realize.

Description

technical field [0001] The invention relates to the field of metamaterial radome, in particular to a metamaterial with switchable transmission / reflection and adjustable amplitude. Background technique [0002] Frequency selective surfaces are widely used in radome, electromagnetic absorption, electromagnetic protection and other fields due to their excellent electromagnetic properties. Traditional frequency selective surfaces mostly use passive structures. Once designed, their electromagnetic properties are solidified and cannot be dynamically adjusted. It is difficult to meet the dual requirements of current and future equipment window materials for electromagnetic communication / detection and low scattering characteristics. Therefore, it is necessary to develop new intelligent electromagnetic control materials, which can simultaneously achieve high-efficiency wave transmission and low electromagnetic scattering properties. [0003] The emergence of metamaterials has opened...

AI Technical Summary

Problems solved by technology

Various types of dynamically tunable metamaterials currently reported in public often focus on the dynamic regulation of a single electromagnetic characteristic (frequency, amplitude, direction, etc.), and their functions are relatively single; even if some multifunctional dynamic metamaterials have appeared, most of them It can only work in a single polarization state and cannot meet the application requirements of complex electromagnetic environments

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