Broadband dual-polarization filtering base station antenna unit, base station antenna array and communication device

Abstract

The invention discloses a broadband dual-polarization filtering base station antenna unit, a base station antenna array and a communication device. The antenna unit comprises four vibrator arms, fourparasitic branches and a feeding structure, wherein two of the vibrator arms are oppositely arranged, the other two of the vibrator arms are also oppositely arranged, the four vibrator arms are in one-to-one correspondence with the four parasitic branches, each vibrator arm is coupled with the corresponding parasitic branch, and the feeding structure is connected with the four vibrator arms; the antenna array comprises at least two antenna units mentioned above, the communication device comprises the antenna unit, or comprises the antenna array mentioned above. The radiation performance can achieve the high rolling-off filtering characteristics and the high polarization isolation, can ensure that no additional insertion loss and the occupied area by the excess structure as far as possible,can expand the bandwidth, and can reduce the height so as to achieve the stable pattern in a wide frequency band.

Description

technical field [0001] The invention relates to a broadband dual-polarization filter base station antenna unit, a base station antenna array and communication equipment, belonging to the field of radio frequency communication. Background technique [0002] In recent years, in addition to optimizing antenna configurations, filtered dipole antennas have been used to reduce out-of-band coupling in multiband base station antenna systems. In order to realize the filter antenna, the traditional method is to cascade the filter circuit and the antenna, and the last resonator is replaced by the antenna radiator. However, insertion loss due to additional filtering circuitry can reduce antenna gain or efficiency. To avoid this problem, filtering structures are integrated with single-polarized antenna radiators, including shorting vias and U-shaped slots, C-shaped slots, and metasurface structures. [0003] In the existing dual-polarization filtering dipole antenna design, it is neces...

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Problems solved by technology

[0004] Specific literature such as "Zhang X.Y., Xue D., Ye L.H., et al. Compact Dual-Band Dual-Polarized Interleaved Two-Beam Array With Stable Radiation Pattern Based on Filtering Elements [J]. IEEE Transactions on Antennas and Propagation, 2017, 65( 9): 4566-4575 "in the design of a new dual-polarization filter patch antenna without additional filter circuit, although it achieves a low profile, its bandwidth is limited

In other designs, "C.-F.Ding, X.-Y.Zhang, Y.Zhang, Y.-M.Pan and Q.Xue,"Compact broadbanddual-polarized filtering dipole antenna with high selectivity for base station applications, "IEEE Transactions on Antennas and Propagation, 2018, 66(11): 5747-5756" proposes a broadband filtering dual-polarized antenna with two parasitic loops, but this design requires multiple filtering structures, complex feeding balun and additional substrate

[0005] The invention patent application "a compact multi-frequency base station antenna array" with the Chinese patent application publication number CN106099352A realizes the filtering function, but the patent application does not realize dual polarization and has the problem that the working bandwidth is not wide enough

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