A device for generating vortex electromagnetic waves

Abstract

The invention provides a vortex electromagnetic wave generating device for solving the problem that the effective working frequency range of the existing vortex wave generating device is narrow. The vortex electromagnetic wave generating device comprises a microwave lens, a metal reflection plate and a feed source; the microwave lens is a cylindrical structure composed of a plurality of fan-shapedcolumn structures, each fan-shaped column structure is stacked by a plurality of fan-shaped structures, and the fan-shaped structure is composed of a partial basic unit located and the center and a plurality of fan-shaped arcs; the basic unit is composed of three mutually perpendicular cylinders, the cylindrical radiuses of various layers of base units of the microwave lens progressively decreasefrom top to bottom, the cylindrical radiuses of the same layer of basic units decrease from the inside to the outside, the cylindrical radiuses of the basic units in the same fan-shaped arc are the same, and the cylindrical radiuses of the basic units in the fan-shaped arc progressively decrease along clockwise / counterclockwise starting from the fan-shaped structure having the maximum cylindricalradius on the various layers; and a plane wave generated by the feed source is compensated by the microwave lens for the first time, and is subjected to secondary phase compensation of the microwavelens after being reflected by the metal reflection plate to obtain a vortex electromagnetic wave.

Description

technical field [0001] The invention belongs to the fields of transformation optics and wireless communication, and relates to a vortex electromagnetic wave generating device, which can be used in the field of wireless communication. [0002] technical background [0003] With the rapid development of wireless communication technology, the spectrum allocated by wireless communication systems has become extremely crowded, and the problem of poor spectrum resources has become increasingly serious, which has become a bottleneck for the sustainable development of wireless mobile communication and service applications. In order to alleviate the contradiction between spectrum resources and the growing demand for wireless services, Professor Bo Thide of the Swedish Institute of Space Physics and others found another way to distort a beam of electromagnetic waves into a beam of vortex electromagnetic waves through experiments, and proposed the use of vortex electromagnetic waves for ...

AI Technical Summary

Problems solved by technology

[0005] Traditional devices for generating vortex waves include rotating phase plates, spiral paraboloids, and array antennas. Among these devices, rotating phase plates are characterized by simple theory and structure, and high conversion efficiency; but in the radio frequency and microwave bands, the beams generated by them diverge Larger angles are not conducive to long-distance transmission, and can only respond to specific frequencies

The spiral parabola is to bend and spiral the existing parabolic antenna into a spiral surface, which is essentially a reflective rotating phase plate. Due to the converging effect of the parabola, the divergent vortex beams can be converged. However, this device can only be used for A certain frequency and it is difficult to generate multiple modes of vortex beam multiplexing; array antenna technology has been extensively studied in recent years, but in order to generate a rotating phase beam, a complex feed phase-shifting network is required

When the vortex wave mode value to be generated is large, more antenna elements are required, which will greatly increase the complexity and design difficulty of the system, which is not conducive to practical applications

In recent years, with the emergence of the electromagnetic metasurface structure, the problems of complex structure, high cost and low efficiency of the traditional vortex wave generation device have been solved. However, the electromagnetic metamaterial reflection unit must adopt a metal resonant unit structure, resulting in The structure can only work effectively near the resonant frequency of the metal resonant unit, and the effective working frequency range is narrow

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