Annular slit antenna for generating OAM (orbital angular momentum) waves

Abstract

The invention discloses an annular slit antenna for generating OAM (orbital angular momentum) waves. The annular slit antenna comprises a dielectric substrate, a rectangular metal patch array and an annular slit metal plate; the annular slit metal plate is arranged at the front surface of the dielectric substrate; rectangular metal patches are evenly arrayed on positions on the back surface of the dielectric substrate which are corresponding to the annular slits of the annular slit metal plate; and the length of the metal patches is larger than the width of the annular slits. According to one preferred embodiment of the invention, the annular slit antenna further comprises a feed circuit and a metal reflection plate; the feed circuit comprises a phase shifter and a power divider; the power divider is used for dividing one path of input signals into N paths of equal-amplitude and equal-phase-difference output signals; electricity is fed to the annular slit antenna through the rectangular metal patch array; and the metal reflection plate is located below the feed circuit so as to enhance the forward-direction radiation of the antenna. The annular slit antenna provided by the invention can generate OAM waves in a specific mode. With the annular slit antenna adopted, a low-cost and miniaturized solution is provided for the generation of OAM waves.

Description

technical field [0001] The invention belongs to the technical field of antennas, and more specifically relates to an annular slot antenna for generating OAM waves. Background technique [0002] With the rapid development of electronics and communication technologies, the demand for bandwidth is constantly increasing, while frequency resources are limited. Allen et al. proposed to use Orbital Angular Momentum (OAM) to expand the communication channel capacity. OAM waves were first applied in the field of optical communication, but because the wavelength of optical communication is much shorter than that of radio communication, high-quality lenses, holographic dry plates, spiral phase plates and splitters can be used in the field of optical communication OAM waves are generated, but it is difficult to realize in the field of radio communication because the wavelength is too long. [0003] In the prior art, in the range of millimeter waves, a helical phase plate antenna can b...

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Problems solved by technology

[0004] The invention provides an annular slot antenna for generating OAM waves, and its purpose is to solve the technical problems of existing antennas for generating OAM waves, complex structures and difficult integration

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