A Huygens metasurface element, transmission array antenna and element phase control method

Abstract

The invention discloses a Huygens supersurface unit, a transmission array antenna and a unit phase control method. The unit includes a dielectric substrate, an upper metal layer located on the upper surface of the dielectric substrate, and a lower metal layer located on the lower surface of the dielectric substrate. The upper metal layer Both the metal resonant ring and the lower metal layer include an split metal resonant ring, and a metal patch is embedded in the metal resonant ring, and the opening positions of the split metal resonant ring of the upper metal layer and the split metal resonant ring of the lower metal layer are antisymmetric. The metasurface is composed of several unit structure arrays. By adjusting the opening size of the outer ring and the length of the embedded metal patch respectively, the unit structure can realize 360° transmission phase control while keeping the transmission amplitude higher than -2.5dB. The invention has an ultra-thin single-layer dielectric structure, does not need perforation design, is easy to process, and can be effectively applied to the design of devices such as beam deflection and transmission arrays in the microwave and even terahertz bands, and can also be used in stealth 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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