Liquid crystal tunable metasurface with narrow transition bandwidth

Abstract

The invention discloses a liquid crystal tunable metasurface with a narrow transition bandwidth, belongs to the technical field of microwave device engineering, and aims to solve the technical problems of low tuning rate, large structural unit size and large transition bandwidth of the conventional liquid crystal tunable metasurface. The metasurface is formed by regularly arranging structural units, and each structural unit is composed of a top dielectric plate, an upper metal structural layer, a liquid crystal layer, a lower metal structural layer and a bottom dielectric plate which are sequentially stacked from top to bottom. The lower metal structure layer is composed of a first rectangular metal patch, a second rectangular metal patch, a right-angle U-shaped strip-shaped metal patch and a linear strip-shaped metal patch, a protrusion is arranged in the middle of the side, away from the right-angle U-shaped metal patch, of the linear strip-shaped metal patch, the upper metal structure layer is formed by vertically overturning the lower metal structure layer and then staggering the lower metal structure layer along the horizontal direction; and staggering along the horizontal direction refers to staggering the lower metal structure layer along the horizontal direction by a distance which is half of the length of the linear strip-shaped metal patch.

Description

technical field [0001] The invention belongs to the technical field of microwave device engineering, and in particular relates to a liquid crystal tunable metasurface with a narrow transition bandwidth. Background technique [0002] Metasurface is a new type of two-dimensional artificial electromagnetic material with strong electromagnetic controllability. By changing the shape and size of its structural units, the characteristics of electromagnetic wave phase, polarization mode, and propagation mode can be adjusted. It is widely used It is used in fields such as antenna, radar and wireless communication. By adding electronically controlled components or electrically controlled media, the operating frequency band, bandwidth, polarization, reflection, transmission, and absorption characteristics of the metasurface can be tuned. Loading varactors, ferroelectrics, graphene, or liquid crystals are several main approaches to achieve tunable functions on metasurfaces. The advant...

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Problems solved by technology

However, the existing liquid crystal tunable metasurfaces have problems such as low tuning rate, large structural unit size (leading to poor angular stability), large transition bandwidth, etc., and the application scenarios are greatly limited.

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