Metasurface orbital angular momentum array antenna with good reflectivity

Abstract

The invention discloses a metasurface orbital angular momentum array antenna with good reflectivity. The array antenna is an array phase plate formed by arranging more than two phase-shifting units, each phase-shifting unit comprises a dielectric layer, the surface of the dielectric layer is provided with square annular metal patches; the bottom portion of the dielectric layer is provided with metal grounding layers, the array phase plate is divided into a first quadrant, a second quadrant, a third quadrant, a fourth quadrant, a fifth quadrant, a sixth quadrant, a seventh quadrant and an eighth quadrant in the clockwise direction, the superficial area of the metal patch in each quadrant is the same, and the superficial areas of the metal patches on the phase-shifting units in the first quadrant, the second quadrant, the third quadrant, the fourth quadrant, the fifth quadrant, the sixth quadrant, the seventh quadrant and the eighth quadrant are decreased in order. The metasurface orbital angular momentum array antenna has a very excellent incident wave reflection vortex effect, the reflection efficiency can reach more than 70 percent, and the metasurface orbital angular momentum array antenna has good energy transmission efficiency; in addition, the metasurface orbital angular momentum array antenna has the advantages of the simple structure, high utilization rate of unit areasof the phase-shifting units, the simple manufacturing process and the low cost.

Description

technical field [0001] The invention relates to a metasurface orbital angular momentum array antenna with good reflectivity, which belongs to the communication field. Background technique [0002] The angular momentum of electromagnetic waves includes spin angular momentum and orbital angular momentum. As an important physical quantity in physics, orbital angular momentum (OAM) has rapidly promoted the new development of nonlinear optics, quantum optics, atomic optics and astronomy since it was confirmed by Allen et al. in 1992. Different from the spin angular momentum, the orbital angular momentum is associated with the helical phase wave front, which can theoretically take infinite values ​​and be orthogonal to each other. Electromagnetic waves carrying orbital angular momentum are different from ordinary plane waves. The center intensity of the beam is zero, and the phase wave front presents a spiral characteristic, also known as vortex electromagnetic waves. The vortex...

AI Technical Summary

Problems solved by technology

This technical solution can realize the phase difference between each unit through the unit structure of the spiral structure to form a vortex electromagnetic wave, but this technical solution needs to accurately arrange the unit structure in a helical shape, which makes its production more troublesome; and the electromagnetic wave beam will It has a large diffusion effect, which leads to the reduction of antenna beam gain and the vortex effect of electromagnetic waves, which is extremely unfavorable to wireless communication

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