Random bit programmable meta-material design method based on space-time coding

Abstract

The invention discloses a random bit programmable meta-material design method based on space-time coding; the method comprises the specific steps: 1, designing a coding unit with a low bit, arrangingin a spatial period to form a two dimension programmable meta-material, wherein each unit structure is integrated with one or more active device, and the unit can present different electromagnetic responses under a digital control module; 2, giving a set of independent time coding sequence to each unit, and periodically cycling to form an equivalent excitation amplitude and phase, thus realizing random high bit responses; 3, designing a corresponding space-time three dimensional coding matrix, and calculating the space scattering energy of the meta-material at different harmonic frequencies, thus satisfying specific application demands. The method can solve the problems that a conventional programmable meta-material is hard to realize high bit designs, thus simplifying a control circuit and a feed network, and saving active devices.

Description

technical field [0001] The invention belongs to the field of novel artificial electromagnetic materials, and in particular relates to a design method for arbitrary bit programmable metamaterials based on space-time coding. Background technique [0002] New artificial electromagnetic materials, also known as electromagnetic metamaterials (English name Metamaterials), are formed by the periodic or non-periodic arrangement of many sub-wavelength unit structures in three-dimensional space, and their equivalent permittivity and permeability can be It can be controlled arbitrarily by designing different metal unit structures or adopting different periodic arrangements, so metamaterials can realize electromagnetic properties that natural materials do not have. However, metamaterials usually have large losses and non-negligible weight and volume, which limits the application prospects of metamaterials to a certain extent. In recent years, in order to reduce the thickness and struct...

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Problems solved by technology

[0005] Purpose of the invention: The purpose of the present invention is to solve the problem of realizing high-bit coding states in existing programmable metamaterials, introduce modulation in the time dimension, and endow each low-bit programmable unit with a set of time coding sequences, which can generate equivalent excitation amplitudes and Phase; any bit programmable space-time encoding metamaterial design can precisely control the electromagnetic wave energy distribution in the space domain and frequency domain, providing a greater degree of freedom

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