Huygens metasurface unit, transmission array antenna and unit phase control method

Abstract

The invention discloses a Huygens metasurface unit, a transmission array antenna and a unit phase control method. Each unit comprises a dielectric substrate, an upper metal layer located on the uppersurface of the dielectric substrate and a lower metal layer located on the lower surface of the dielectric substrate. Each of the upper metal layer and the lower metal layer comprises an opening metalresonance ring, and a metal patch is embedded in each metal resonance ring; the opening positions of the opening metal resonance ring of the upper metal layer and the opening metal resonance rings ofthe lower metal layer are antisymmetric. A metasurface is composed of a plurality of unit structure arrays; by adjusting the size of an opening of the outer ring and the length of the embedded metalpatch respectively, the unit structures can achieve the 360-degree transmission phase control under the condition of keeping the transmission amplitude higher that -2.5 dB. The Huygens metasurface unit is provided with a ultra-thin single-layer dielectric structure, does not need the punching design, is easy to machine, can be effectively used for the design of microwaves and even terahertz wave bands, such as beam deflection and transmission arrays, and can also be used in the aspects of invisibility and imaging.

Description

technical field [0001] The invention belongs to the field of novel artificial electromagnetic materials, and in particular relates to a Huygens metasurface unit, a transmission array antenna and a unit phase control method. Background technique [0002] Metamaterials are composed of artificial subwavelength unit structures with periodic or non-periodic arrangements, and have the ability to flexibly manipulate electromagnetic waves. The exotic electromagnetic properties of metamaterials make many interesting applications such as negative refraction, electromagnetic cloaking, and transformation optical lenses spring up like mushrooms. The metasurface that configures subwavelength scattering units on a two-dimensional surface is a new type of planar metamaterial, which also has a powerful electromagnetic wave control ability comparable to that of traditional three-dimensional metamaterials. Metasurfaces are generally divided into two types: reflective and transmissive. For re...

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Problems solved by technology

However, some scholars have proved that the multilayer frequency selective surface has a limitation: under the premise of maintaining high transmittance, the multilayer frequency selective surface needs at least three layers of metal structure to achieve 360° transmission phase control, which limits the size of the structure. Difficulty in processing and processing

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