Transmission type artificial electromagnetic metasurface unit for generating wave beam carrying orbital angular momentum

Abstract

The invention discloses a transmission-type artificial electromagnetic metasurface unit for generating a wave beam carrying orbital angular momentum. Upper and lower surfaces of a dielectric substrateare respectively provided with a metal layer, and the two metal layers are the same in structure and are arranged in an up-and-down corresponding manner. Each metal layer is composed of four metal patches. The metal patch is an arc-shaped metal patch with the radian of pi / 4, one ends of the four metal patches are jointly connected with the center of an electromagnetic surface unit, every two adjacent metal patches are spaced by 90 degrees with the center of the electromagnetic surface unit as the circle center, the bending directions of the four metal patches are consistent, and metal columnsconnected with the upper metal layer and the lower metal layer are arranged at the positions, away from the center of the electromagnetic surface unit by a certain distance, of the four metal patches. The transmission-type artificial electromagnetic metasurface unit is advantaged in that the artificial electromagnetic surface unit carrying the orbital angular momentum wave beam is obviously improved in the aspects of aperture, wave beam divergence angle and thickness, and the wave beam generated by the whole artificial electromagnetic surface achieves higher gain and good wave beam divergenceangle and aperture efficiency under the condition of smaller thickness.

Description

technical field [0001] The invention relates to the field of artificial electromagnetic metasurface structures, in particular to a transmission type artificial electromagnetic metasurface unit that generates beams carrying orbital angular momentum. Background technique [0002] With the commercialization of 5G technology and the rapid development of the Internet of Things, people have higher and higher requirements for the rate and capacity of wireless communication. While putting forward requirements on antenna performance, the transmission data is also coded and modulated. The main modulation method There are amplitude modulation, frequency shift modulation, phase shift modulation, and quadrature phase shift modulation. These modulation methods can increase the channel capacity, but will greatly increase the complexity of the entire system, and the increase in complexity will lead to increased costs and errors. Electromagnetic waves carrying orbital angular momentum have ...

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide a transmissive artificial electromagnetic metasurface unit that can generate orbital angular momentum beams, so as to solve the problems of high cost, bulky products, and large electromagnetic wave loss in the current technical solutions for orbital angular momentum electromagnetic waves.

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