Multifunctional coding metasurface for regulating and controlling electromagnetic wave transmission

Abstract

The invention discloses a multifunctional coding metasurface for regulating and controlling electromagnetic wave transmission, relates to the technical field of coding metasurfaces, and aims to solvethe problems of limited working mold and limited function of a traditional coding metasurface. The multifunctional coding metasurface comprises a reflecting layer, a filtering layer and two transmission layers which are sequentially stacked from top to bottom, and every two adjacent layers are connected through a square dielectric layer. The reflecting layer is of a cross-shaped structure, a strip-shaped body is vertically arranged at each of the two ends of a trunk of the cross-shaped structure, and the filtering layer comprises a square ring with diagonal openings and a square patch locatedin the geometric center of the square ring. The transmission layer comprises two G-shaped structures, the two G-shaped structures are arranged in a central symmetry manner, and the geometric center ofthe reflecting layer, the geometric center of the filtering layer, the geometric center of the transmission layer and the geometric centers of all the dielectric layers are coaxially arranged. The multifunctional coding metasurface has important application in the fields of antennas, beam splitting, holograms and the like.

Description

technical field [0001] The invention belongs to the technical field of coded metasurfaces, in particular to electromagnetic structures. Background technique [0002] A metamaterial is a three-dimensional artificial medium with a periodic or non-periodic structure. Its properties have nothing to do with the material components that make it up, but only with the structural form and combination of the units that make it up. Traditional metamaterial research usually uses the equivalent medium method for analysis. By designing various special unit structures, metamaterials can realize electromagnetic properties that natural materials cannot have, and then regulate electromagnetic wave transmission to achieve many novel functions. [0003] However, the control ability of metamaterials depends on the phase accumulation generated during wave propagation, which requires that metamaterials must have a certain thickness. This undoubtedly increases the processing difficulty and loss of...

AI Technical Summary

Problems solved by technology

But the fly in the ointment is that although the coding metasurface can realize these functions efficiently, most of the coding metasurfaces can only control electromagnetic waves in half space, that is, they can only work in the transmission mode or reflection mode.

Although there are coded metasurfaces in the prior art that can work in the transmission / reflection mode at the same time, such coded metasurfaces can only achieve bidirectional deflection or bidirectional focusing, and their functions are limited, which is not conducive to the high integration of modern electronic systems.

Images