2-bit programmable digital metasurface insensitive to incident angle

Abstract

The invention discloses a 2-bit programmable digital metasurface insensitive to an incident angle. The metasurface is formed by periodically arranging 2-bit units in a two-dimensional space, each 2-bit unit is integrated with two switching diodes, and four reflection phase responses, namely 0 degree, 90 degrees, 180 degrees and 270 degrees, can be obtained by changing the state combination of thediodes and respectively correspond to '00', '01, '10' and '11' of digital coding. The phase response of the 2-bit units under different codes does not change drastically along with the change of the incident angle, and the phase difference among the four codes can still be kept at about 90 degrees during oblique incidence at the angle of 60 degrees. According to the invention, working stability under large-angle oblique incidence can be achieved; excellent oblique incidence wave beam deflection capacity is provided and the metasurface has important application prospects in the fields of wireless communication, radars, imaging, signal processing and the like.

Description

technical field [0001] The invention belongs to the field of novel artificial electromagnetic materials, and in particular relates to a 2-bit coded digital metasurface insensitive to incident angles. Background technique [0002] New artificial electromagnetic materials, also known as electromagnetic metamaterials (Metamaterials), are an artificial material composed of macroscopic basic units with specific geometric shapes arranged periodically / aperiodically, or implanted into the body (or surface) of the matrix material. . The difference between electromagnetic metamaterials and traditional materials is that the original microscopic units (atoms or molecules) are replaced by macroscopic units. In recent years, in order to reduce the thickness and structural complexity of three-dimensional metamaterials, single-layer planar metasurfaces (Metasurfaces) are also widely used to regulate electromagnetic waves, achieving low loss, simple processing, and easy integration. [000...

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Problems solved by technology

[0005] Purpose of the invention: The purpose of the present invention is to solve the reflection characteristics of the existing programmable metasurface in the case of oblique incidence, especially the reflection phase will be unstable with the increase of the incident angle, which will cause the phase difference between the codes to deviate from the original design, and finally Problems causing performance degradation of programmable metasurfaces under oblique incident wave irradiation

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