A digitally programmable space-time encoding metamaterial

Abstract

The invention discloses a digital programmable space-time coding meta-material comprising a time varying artificial electromagnetic surface and a digital control module; the artificial electromagneticsurface is formed by periodically arranging time varying encoding units in space, wherein each unit structure is integrated with a switching diode; the digital control module provides different biasvoltages so as to present different electromagnetic responses; the basic units can be controllable in space layout, and can periodically cycle in the time dimension according to a corresponding time encoding sequence, thus forming corresponding harmonic wave energy distribution in the frequency domain, finally regulating electromagnetic waves in space domain and frequency domain. The time-space encoding matrix is designed; the space-time coding meta-material can realize many fancy functions, such as harmonic wave beam scanning and scattering energy inhibition. In addition, the time dimension of the encoding meta-material can be explored, thus accurately controlling the meta-material frequency spectrum energy, and providing very important application prospects in the wireless communicationfields.

Description

technical field [0001] The invention belongs to the field of novel artificial electromagnetic materials, and in particular relates to a digital space-time coding metamaterial based on a programmable time-varying unit. 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 bulk metamaterials, metasurfaces with single-layer planar structures are also widely used to regulate electromagnetic waves. [0003] Professor Cui Tiejun's research group proposed the c...

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Problems solved by technology

[0004] The coding metamaterials mentioned above only have coding in the spatial dimension, and do not consider the coding that changes periodically in the time dimension, that is to say, the spatial coding at a certain moment is fixed, and the spatial coding is only switched when the transformation function is needed

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