High-radiation-efficiency circularly polarized antenna unit suitable for millimeter wave frequency band

Abstract

The invention discloses a high-radiation-efficiency circularly polarized antenna unit suitable for a millimeter wave frequency band, and belongs to the technical field of antennas. The antenna is composed of four groups of monopole antennas which are distributed in a symmetrical structure, each group of monopole antennas comprises a feed structure, a main radiation sheet and a parasitic radiation sheet, and the four groups of monopole antennas feed excitation signals with equal amplitude and 90-degree phase difference in sequence according to the rotation direction to form a left-handed / right-handed circularly polarized antenna unit. The even / monopole type antenna unit is applied to the millimeter wave frequency band, can cover the frequency band width of 24.25-29.5 GHz, and has high radiation efficiency in the whole frequency band directional diagram.

Description

technical field [0001] The invention relates to the technical field of antennas, in particular to a circularly polarized antenna unit with high radiation efficiency suitable for millimeter wave frequency bands. Background technique [0002] Due to its abundant spectrum resources, millimeter-wave antennas have become the main evolution direction of the next generation of mobile communications (6G). At the same time, based on the millimeter-wave antenna system based on the AIP / AOB architecture, the antenna unit and the multi-channel radio frequency chip are interconnected in the vertical dimension, and the integration level has been significantly improved, which facilitates the construction of a larger-scale MIMO antenna. [0003] The dipole / monopole antenna unit has the characteristics of wide bandwidth, high radiation efficiency, and high cross-polarization ratio. It is widely used in the design of base station antennas in the L / C band, but the dipole in the machining mode i...

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Problems solved by technology

[0003] The dipole / monopole antenna unit has the characteristics of wide bandwidth, high radiation efficiency, and high cross-polarization ratio. It is widely used in the design of base station antennas in the L / C band, but the dipole in the machining mode is mainly used. The sub / monopole antenna unit has limited processing technology in the millimeter wave frequency band, especially the coaxial-like feed structure is difficult to achieve equivalently, and its application in the millimeter wave frequency band is restricted

[0004] At present, the antenna form widely used in the millimeter wave frequency band is the multi-layer laminated microstrip patch antenna. In view of the high Q value of the microstrip antenna, large radiation loss and dielectric loss are generated when working in the high frequency band. The antenna's Radiation efficiency is not high (radiation efficiency is around 80%)

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