1-bit microwave anisotropic electromagnetic coding meta-material

Abstract

The invention provides a 1-bit microwave anisotropic electromagnetic coding meta-material. A unit structure of the meta-material consists of an isotropic structure and an anisotropic structure. The design and optimization of geometric parameters of the unit structure can enable each unit to represent independent reflection phase 0 degree and 180 degrees during the irradiation of x-polarization and y-polarization vertically-incident electromagnetic waves, wherein the independent reflection phase 0 degree and 180 degrees are respectively corresponding to a digital state '0' and a digital state '1'. The digital units are arranged on a two-dimensional plane according to digital coding designed in advance, thereby forming the anisotropic electromagnetic coding meta-material. Because each unit is independent in response during x-polarization and y-polarization, the coded meta-material can make independent response during the irradiation of x-polarization and y-polarization vertically-incident electromagnetic waves, including abnormal beam separation and random surface scattering. The meta-material is simple in structure, is easy to machine, is wide in frequency band, can be used for the design of beam separation to generate a plurality of beams, or can be used for the design of an invisible surface, and effectively reduces the radar scattering section of a target.

Description

technical field [0001] The invention relates to a novel artificial electromagnetic material, in particular to an anisotropic electromagnetic coded metamaterial with a polarization-controlled function. Background technique [0002] Arbitrary manipulation of electromagnetic waves has always been a research hotspot in the field of electromagnetics. Traditional solutions usually use a whole piece of dielectric material (traditional lens) or rely on the shape of a metal surface (traditional antenna) to regulate the distribution of electromagnetic fields, but such solutions rely on specific The geometric shape or the equivalent refractive index of the lens is achieved by the spatial phase accumulation, so it has a thick thickness and is not easy to integrate with other devices. [0003] In 2011, Capasso et al. proposed the generalized Snell's law. By introducing discontinuous phases on the two-dimensional surface, the phase that originally needs to be accumulated in space is chang...

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Problems solved by technology

[0002] Arbitrary manipulation of electromagnetic waves has always been a research hotspot in the field of electromagnetics. Traditional solutions usually use a whole piece of dielectric material (traditional lens) or rely on the shape of a metal surface (traditional antenna) to regulate the distribution of electromagnetic fields, but such solutions rely on specific The geometric shape or the equivalent refractive index of the lens is achieved by the spatial phase accumulation, so it has a thick thickness and is not easy to integrate with other devices

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