Polarization reconfigurable method of holographic metasurface antenna

Abstract

The invention discloses a polarization reconfigurable method of a holographic metasurface antenna of which three states of line polarization, left-hand circular polarization and right-hand circular polarization, of a holographic metasurface antenna can be switched, and belongs to the technical field of antennas. The antenna comprises three parts comprising a polarization non-sensitive holographicmetasurface, a polarization reconfigurable feeding structure and a metal floor, wherein the polarization non-sensitive holographic metasurface is used for radiating a leakage wave, a polarization non-sensitive holographic metasurface structure is obtained by applying and periodic sine modulation onto sub-wavelength unit equivalent refractive index of the polarization non-sensitive holographic metasurface, the polarization reconfigurable feeding structure comprises a cross dipoles loaded with four PIN tubes, a 50-ohm coaxial line is used for directly feeding the polarization reconfigurable feeding structure, conversion among three polarization states of linear polarization, left-hand circular polarization and right-hand circular polarization can be achieved by controlling on / off states of the four PIN tubes, and the metal floor is used for achieving directional radiation of the antenna. The invention initially proposes the polarization reconfigurable design method, which is implementedby the polarization non-sensitive holographic metasurface employing refractive index sine modulation and combined with the polarization reconfigurable feeding structure, of the holographic metasurfaceantenna, the polarization reconfigurable function of the three states of the holographic metasurface antenna is achieved by controlling on / off of a few amount of PIN switches of the polarization reconfigurable feeding structure under the condition that the holographic metasurface radiation aperture is maintained unchanged, and the holographic metasurface antenna has the advantages of a pen conical radiation pattern, high gain, high aperture efficiency, plane, low profile, low cost and the like and is easy to process.

Description

technical field [0001] The invention belongs to the technical field of antennas, and relates to a polarization reconfigurable realization method of three states of linear polarization, left-handed circular polarization and right-handed circular polarization of a holographic metasurface antenna. Background technique [0002] The polarization reconfigurable antenna can switch the polarization state between linear polarization and circular polarization, and improve system capacity by multiplexing the same channel and frequency spectrum, reducing polarization mismatch and channel interference. Based on holographic optical technology, the holographic metasurface antenna realizes the aperture antenna with characteristic radiation by periodically modulating the metasurface structure. Compared with the reflector antenna, it has no feed shielding problem in the radiation direction of the antenna; compared with the microstrip antenna array, the holographic metasurface antenna does not...

AI Technical Summary

Problems solved by technology

At present, the reports on holographic metasurface antennas mainly focus on the single polarization of linear polarization or circular polarization, and there are few reports on holographic metasurface antennas with polarization reconfigurable ability.

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