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Digital programmable space-time coding meta-material

A space-time encoding and metamaterial technology, applied in the field of new artificial electromagnetic materials, can solve problems such as encoding without considering periodic changes, and achieve the effect of convenient processing and easy realization

Active Publication Date: 2018-09-07
SOUTHEAST UNIV
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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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  • Digital programmable space-time coding meta-material

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Embodiment Construction

[0042] In the present invention, the digital programmable space-time coding metasurface is composed of a time-varying artificial electromagnetic surface and a digital control module. Among them, the artificial electromagnetic surface is composed of time-varying encoding units arranged periodically in space. Each unit structure integrates a switching diode. At two different bias voltages, the unit structure presents two types of electromagnetic wave reflection with a phase difference of 180 degrees. Different electromagnetic responses, respectively marked as "0" and "1" binary code. Each time-varying encoding unit has an independent set of time encoding sequences, which are quickly switched by the bias voltage provided by the digital control module, and cycle according to the time encoding sequences within a certain period of time. Based on the Fourier transform theory, the corresponding harmonic energy distribution can be generated in the frequency domain, and finally electrom...

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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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Application Information

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IPC IPC(8): H01Q15/00
CPCH01Q15/002H01Q15/0086
Inventor 崔铁军张磊
Owner SOUTHEAST UNIV
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