A Polarization-Controlled Space-Wave-to-Surface-Wave Functional Device

Abstract

The present invention proposes a polarization-controlled space-wave-to-surface-wave functional device, which is composed of a 2-bit anisotropic electromagnetic coded metasurface. The heterogeneous codes are arranged on a two-dimensional plane to form a polarization-controlled space-wave-to-surface-wave functional device. Since each unit has an independent phase response in x-polarization and y-polarization, the device has different functions under the irradiation of incident waves with two polarizations perpendicular to each other, and can be used to make x-polarization and y-polarization perpendicular to each other. The incident wave is converted into a surface wave and guided in different directions; or the x-polarized incident wave is converted into a surface wave, and the y-polarized incident wave is reflected to any direction in space. The invention has the advantages of ultra-thinness, low profile and high efficiency, and has stronger application range and greater design freedom in practical application.

Description

technical field [0001] The invention relates to a novel artificial electromagnetic material, in particular to a polarization-controlled space wave-to-surface wave functional device working in the microwave section. Background technique [0002] New artificial electromagnetic materials, also known as electromagnetic metasurfaces (Metamaterials), are an artificial material composed of macroscopic basic units with specific geometric shapes arranged periodically or aperiodically, or implanted into the body (or surface) of the matrix material. . The difference between electromagnetic metasurfaces and traditional materials is that the original microscopic units (atoms or molecules) are replaced by macroscopic units. Although the unit sizes of the two are quite different, their responses to external electromagnetic waves are reflected by the interaction between the basic unit resonant system and the external electromagnetic field. Electromagnetic metasurfaces define the behavior ...

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Problems solved by technology

[0004] The metasurface units mentioned above are all isotropic structures, that is, the designed metasurfaces have the same function for incident electromagnetic waves of any polarization, and cannot change with the polarization of incident electromagnetic waves. Fudan The space-wave-to-surface wave device based on the H-shaped metal structure proposed by Professor Zhou Lei of the University can only target one polarization direction, but is invalid for the incident wave of the other polarization.

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