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Method for generating omni-directional circularly polarized vortex electromagnetic waves

A vortex electromagnetic wave and generation method technology, which is applied in the direction of electrical components, electrical digital data processing, special data processing applications, etc., can solve the problems of polarization mismatch, low gain of omnidirectional vortex electromagnetic wave beam, etc., and achieve simple feeding , Low engineering price, high gain effect

Active Publication Date: 2019-12-20
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The disadvantage of this generation method is: the vortex wave beam radiated by the hybrid coupler, although the beam can be distributed in the orbital plane, due to the limitations of the resonant cavity, the beam gain of the obtained omnidirectional vortex electromagnetic wave In addition, the omnidirectional vortex wave generated by this method is linearly polarized, but the linearly polarized polarization method has the disadvantage of polarization mismatch in the communication field

Method used

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  • Method for generating omni-directional circularly polarized vortex electromagnetic waves
  • Method for generating omni-directional circularly polarized vortex electromagnetic waves
  • Method for generating omni-directional circularly polarized vortex electromagnetic waves

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Embodiment 1

[0034] The vortex electromagnetic wave is an electromagnetic wave that carries both spin angular momentum and orbital angular momentum, and has a spiral phase wave front. In the field of communication, the orbital angular momentum carried by vortex electromagnetic waves can be used for information control to greatly increase the channel capacity, which is expected to break through the Shannon limit of channel capacity.

[0035] Compared with ordinary vortex electromagnetic waves, the omnidirectional circularly polarized vortex electromagnetic wave not only has the advantage of large radiation coverage area, but also effectively avoids the application limitation of the divergence characteristics of ordinary vortex waves in the communication field; another On the one hand, its circularly polarized polarization characteristics can effectively avoid the polarization mismatch of linearly polarized antennas, reduce the multipath fading and multipath reflection effects of electromagne...

Embodiment 2

[0053] The generation method of the omnidirectional circularly polarized vortex electromagnetic wave is the same as embodiment 1, the phase distribution of the expected vortex electromagnetic wave of the calculation lens assembly described in step (3), wherein the expected vortex electromagnetic wave phase of the outer surface of the ring cylindrical metasurface lens assembly Distribution, expressed in a mathematical way, assuming that the center coordinate position of the (m, n)th lens unit structure is (x mn ,y mn ,z mn ), then its corresponding expected vortex electromagnetic wave phase The expression of is as follows:

[0054]

[0055] In the formula, L is the orbital angular momentum mode; m is the row number of the transmission unit structure in the toroidal cylindrical metasurface lens assembly, m=1, 2,..., M; n is the transmission unit in the toroidal cylindrical metasurface lens assembly The number of columns where the structure is located, n=1,2,...,N.

[005...

Embodiment 3

[0058] The generation method of omnidirectional circularly polarized vortex electromagnetic wave is the same as embodiment 1-2, the metal layer geometric rotation angle distribution of the calculation lens assembly initial model described in step (4), wherein the outer surface of the annulus cylindrical metasurface lens assembly initial model The geometric rotation angle distribution of the metal layer of is expressed mathematically as, the geometric rotation angle α of the metal layer in the (m,n)th transmission unit structure mn The calculation formula is as follows:

[0059]

[0060] In the formula, is the expected vortex electromagnetic wave phase on the outer surface of the (m, n)th transmission unit structure in the toroidal cylindrical metasurface lens assembly.

[0061] see image 3 (b), in the relationship curve of the circularly polarized transmission phase of the transmission unit structure with respect to the rotation angle of the metal layer obtained by simu...

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Abstract

The invention provides a method for generating omni-directional circularly polarized vortex electromagnetic waves, and solves the technical problems that in the prior art, omni-directional vortex electromagnetic waves are low in gain, and circular polarization is difficult to achieve. The implementation process comprises the following steps of: designing the lens shape of a cylindrical metasurfacelens component; setting parameters of the lens component; calculating expected vortex electromagnetic wave phase distribution and metal layer geometric rotation angle distribution of the initial model; establishing a lens component initial model and performing full-wave simulation; calculating convergence phase distribution and metal layer geometric rotation angle distribution of a final model; and obtaining a final model of the lens component, and carrying out full-wave simulation verification on the final model. A planar metasurface lens formed by periodically arranging transmission unit structures is conformal to a cylindrical surface to form a cylindrical metasurface lens component. The method for generating omni-directional circularly polarized vortex electromagnetic waves has the advantages of the relatively high gain, the relatively high circular polarization purity and the simple feeding, and can be applied to the field of communication.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to a method for generating vortex electromagnetic waves, in particular to a method for generating omnidirectional circularly polarized vortex electromagnetic waves, which can be used in the technical field of wireless communication. Background technique [0002] The vortex electromagnetic wave is a special electromagnetic wave carrying orbital angular momentum. The infinite orthogonal orbital angular momentum modes of this electromagnetic wave can significantly increase the channel capacity in the field of wireless communication. Due to the unique electromagnetic properties of the vortex wave, its central dark core increases with the increase of the topological charge, that is, the degree of divergence increases with the increase of the topological charge. In view of this characteristic, in the prior art, various converging methods are used to narrow the radiation elevation angl...

Claims

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Application Information

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IPC IPC(8): H01Q1/50H01Q15/00H01Q15/02H01Q15/24G06F17/50
CPCH01Q1/50H01Q15/0086H01Q15/02H01Q15/24
Inventor 衣建甲李蝶朱丽娜刘晨晨郭明涛杨龙
Owner XIDIAN UNIV
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