Transmission type metasurface for circular polarization beam forming and design method

Abstract

The invention discloses a transmission type metasurface for circular polarization beam forming. Each unit of the metasurface comprises two metal layers and a dielectric substrate. Each of the upper metal layer and the lower metal layer comprises a round hole and a metal patch structure positioned in the round hole; the metal patch structure comprises a first metal strip and a second metal strip which are vertically intersected, and the first metal strip is provided with first to fourth branches; the first metal strip and the first to fourth branches form a back-to-back symmetrical E-shaped metal patch structure with an outward opening; through adjusting the rotation angle of the upper layer symmetrical E-shaped metal patch structure and the rotation angle difference of the upper layer symmetrical E-shaped metal patch structure and the lower layer symmetrical E-shaped metal patch structure, independent regulation and control of the transmission amplitude and the transmission phase of the circularly polarized wave are realized. Based on the transmission metasurface combined with an array antenna theory, amplitude and phase distribution required by a preset performance index can be obtained through optimization, arbitrary beam forming of circularly polarized waves is further achieved, and the transmission type metasurface has the advantages of being ultrathin, small in size, high in efficiency and the like.

Description

technical field [0001] The invention belongs to the field of new artificial electromagnetic materials, and in particular relates to a transmission-type metasurface for circularly polarized beam forming and a design method, which can be applied to wireless communication systems such as mobile communication, radar and satellite communication. Background technique [0002] Metasurface is a development and extension of new artificial electromagnetic materials. In the process of studying new artificial electromagnetic materials, the researchers found that if the sub-wavelength electromagnetic units are arranged on a two-dimensional plane, by designing the unit's own structure and arrangement, this plane can control the propagation of electromagnetic waves. Direction and polarization direction can be adjusted. It can realize the flexible and effective control of electromagnetic wave beam direction, polarization mode, propagation mode and other characteristics. Compared with trad...

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Problems solved by technology

However, in the prior art, metasurfaces that can independently adjust amplitude modulation and phase modulation are mostly aimed at linearly polarized electromagnetic waves, while there are few reports on the design of independent amplitude modulation and phase modulation for circularly polarized electromagnetic waves, especially transmissive metasurfaces.

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