A millimeter wave omnidirectional circularly polarized antenna for 5g communication

Abstract

The invention provides a millimeter wave omnidirectional circularly polarized antenna used for 5G communication. The millimeter wave omnidirectional circularly polarized antenna comprises a first dielectric plate and a second dielectric plate which are stacked up and down; at least four square parasitic patch units with annular gaps in one diagonal line are printed on the upper surface of the first dielectric plate to form a rotary symmetric structure, and the angles between the adjacent parasitic patch units are equal; a feed network and at least four square radiation patch units with disturbance branches on a pair of opposite corners are printed on the upper surface of the second dielectric plate, and a metal grounding plate is printed on the lower surface of the feed network; each output arm of the feed network comprises a section of tapered gradual change line; the radiation patch units are located under the parasitic patch units; and the diagonal line where the disturbance branches are located and the diagonal line wherein the annular gaps of the parasitic patch units are located are consistent in direction. According to the antenna, high omni-directional circular polarizationcharacteristics can be kept in a 5G communication at 28GHz working frequency band, and the power capacity of the antenna is improved while the D2D communication requirement is met.

Description

technical field [0001] The invention belongs to the technical field of antennas, and in particular relates to a millimeter-wave omnidirectional circularly polarized antenna that can be used for 5G communication, and can be used for D2D communication in the 5G system. Background technique [0002] Circularly polarized waves are widely used in modern wireless systems. Circularly polarized antennas can avoid polarization mismatch problems in complex wireless channels; omnidirectional antennas have a wide radiation coverage and can realize multiple communication links between multiple users. . Therefore, omnidirectional circularly polarized antennas are widely used in many fields such as remote sensing and telemetry, space vehicles, maritime communications, and wireless communications. [0003] However, the current research on omnidirectional circularly polarized antennas is mainly concentrated in the microwave frequency band, and it is particularly difficult to achieve omnidir...

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Problems solved by technology

[0005] 1. In 2014, Electron.Lett. published an article titled "Ka-band circularly polarize omnidirectional antenna for wide elevation coverage" by P.K.Verma, R.Kumar et al., disclosing a slanted slot on a circular waveguide and An antenna composed of a coaxial feed probe, which converts the linearly polarized wave of the monopole into a circularly polarized wave through the surrounding polarizer, and realizes omnidirectional circular polarization in the millimeter wave frequency band. The size of this structure is relatively large for Cannot meet miniaturization requirements

[0006] 2. Chinese patent authorization number CN 103094666B discloses a millimeter-wave omnidirectional circularly polarized antenna based on a circularly polarized horn. The antenna is composed of a millimeter-wave circularly polarized horn and a metal cone reflecting surface, and realizes omnidirectionality in the millimeter-wave frequency band. Circular polarization, but this kind of antenna has a large size and a high profile, which cannot meet the miniaturization requirements

At the same time, the corner-cutting treatment of the microstrip unit or the double-feed structure are adopted to achieve circular polarization characteristics, but the microstrip antenna in the form of a corner-cutting corner of the microstrip unit usually has an axial ratio bandwidth of only 1% to 3%, and the combination After the array, because of the stray radiation of the high-order mode of the microstrip antenna, the cross-polarization of the antenna is enhanced, which leads to the deterioration of the circular polarization characteristics and the reduction of the axial ratio bandwidth. Therefore, the standing wave bandwidth and the axial ratio bandwidth of the antenna using this implementation are narrow

[0008] 4. In 2017, IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION published an article titled "28GHz Compact Omnidirectional Circularly Polarized Antenna for Device-to-Device Communications in the Future 5G Systems" by Wei Lin et al. The pole elements are printed on a single dielectric substrate and systematically integrated into a compact disc structure. The antenna realizes omnidirectional circular polarization by forming parallel electromagnetic dipoles. It is compact in size and realizes 5G communication at 28GHz for the first time. Omnidirectional circular polarization in the frequency band, but the metal wire connecting the spiral arm in the antenna structure is too thin, resulting in low power capacity, and it is easy to be damaged during long-term use

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