Design method and application of a transmission-reflection gradient metasurface unit

Abstract

The invention discloses a design method and an application of a transmission-reflection gradient meta-surface unit. The method comprises the following steps: the unit is designed in a four-layer orthogonal cascade patch structure; the cycle of the unit p=p=11mm, w1=4mm, and w2=3mm; an F4B dielectric plate of which the thickness (h) is 1.5mm and the dielectric constant is 2.65 is adopted; the thickness of a metal layer is 0.018mm; and the transmitted wave is controlled by a vertical patch. The characteristics of a designed transmission-reflection deflector are represented by near-field characteristics. Under x polarization excitation, beams undergo reflection singular deflection, an incidence field is cut, and there is only a response field. Under y polarization excitation, beams undergo transmission singular deflection, and the efficiency is high. For a TRGMS, both transmitted beams and reflected beams can be controlled, which cannot be realized by a GMS previously reported; and meanwhile, the research category of the GMS is expanded.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to a design method and application of a transmission-reflection gradient metasurface unit. Background technique [0002] The theoretical discovery of the generalized refraction / reflection law and the experimental verification of the gradient metasurface have opened up a new way and field for people to regulate electromagnetic waves, and are promoting deep technological innovation in this field. The so-called gradient metasurfaces (GradientMetasurfaces, GMS) are designed based on the idea of ​​phase mutation and polarization control, and are composed of artificial microstructure units, a two-dimensional new artificial structure surface that obeys the generalized Snell's law, and can flexibly excite and transmit electromagnetic waves. control. GMS has potential applications in stealth surfaces, conformal antennas, digital coding, lithography, etc., and has developed into a hot sp...

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Problems solved by technology

[0004] Although researchers have conducted in-depth and extensive research on GMS, the research objects are only for transmission systems or reflection systems, and transmission-reflection integrated systems have never been reported. Traditional GMS has made great progress in improving beam steering capabilities and expanding the application of metamaterials. However, in the face of the current increasing beam control in the entire space, multi-functional requirements, and integration trends, traditional GMS still has many shortcomings: First, the high-efficiency principle of anisotropic metasurfaces under multiple polarization excitations has become an urgent need to solve Second, there are various beam manipulation methods, but the function of the gradient plate is relatively single. For example, GMS realizes the singular deflection effect, focusing, vortex light, etc., but there are few reports on the gradient plate integrating two or more functions at the same time; The third is that the beam control range is concentrated in 0-180°, and the beam control in the whole airspace has not been reported yet.

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