A 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 composed of more than two phase shifting units; the phase shifting unit includes a dielectric layer, and the surface of the dielectric layer is There is a metal patch in the shape of a square ring; the bottom of the dielectric layer is provided with a metal ground layer; the array phase plate is divided clockwise into the first quadrant, the second quadrant, the third quadrant, and the fourth quadrant , the fifth quadrant, the sixth quadrant, the seventh quadrant and the eighth quadrant, the surface area of ​​the metal patch in each quadrant is the same, and the surface area of ​​the metal patch on the phase shifting unit in the first quadrant to the eighth quadrant decreases in turn . The invention has a very superior incident wave reflection vortex effect, the reflection efficiency can reach more than 70%, and has a good energy transmission efficiency; in addition, the invention has a simple structure, a high utilization rate per unit area of ​​the phase shifting unit, and has a manufacturing process The advantages of simplicity and 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

Images