Base station MIMO antenna unit

Abstract

The invention discloses a base station MIMO antenna unit, and belongs to the technical field of antennas. The antenna unit comprises a radio frequency connector, and a loading layer, a radiation layer, a feed network layer and a metal ground layer which are sequentially arranged from top to bottom. The base station MIMO antenna unit has the characteristics of the compact and simple structure and the small electrical size, has a dual-polarized radiation function, and can meet the strict technical requirements of the digital multi-beam antenna on the radiation unit.

Description

technical field [0001] The invention relates to the technical field of antennas, in particular to a MIMO antenna unit for an office base station. Background technique [0002] Since the commercial use of the communication system is imminent, the design of the antenna has attracted the attention of many scholars. Most of them are four-port and eight-port antennas. The MIMO antenna terminal antenna with large electrical size cannot be used in the beamforming base station antenna system. The scene is a handheld terminal, an IoT terminal, and the technical characteristics of four-port and eight-port are high antenna port isolation and symmetrical pattern. Due to the complexity of the feeding network and the large space occupied, the antenna cannot achieve an electrically small size design. . [0003] At this stage, base station MIMO antennas mainly have the following forms: [0004] 1. Dual-polarized half-wave dipole antenna: This type of antenna has a simple structure, a stan...

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Problems solved by technology

[0004] 1. Dual-polarized half-wave dipole antenna: This type of antenna has a simple structure, a standing wave bandwidth greater than 60%, and high port isolation, but its profile is relatively high, usually around 0.25 wavelengths, and its electrical size is 0.8 wavelengths, which cannot meet 5G requirements. Base station antenna beamforming requirements for electrically small size (0.5 wavelength) of the antenna unit;

[0005] 2. In the form of dual-polarized microstrip antennas, in order to broaden the standing wave bandwidth of the antenna unit, the form based on the microstrip antenna often uses a slot-coupled electromagnetic structure to broaden the bandwidth of the antenna. The standing wave bandwidth is about 20%, and the port isolation Satisfy greater than 25%, because it is an air sandwich structure, the profile is high, and it is not easy to achieve active integration design;

[0006] 3. Magnetically coupled dual-polarized dipole antenna. This form of antenna uses two orthogonally placed L probes to excite two pairs of dipoles with pillars. This shape has a simple structure, wide bandwidth, high port isolation, and low profile, but its The active circuit integrated design cannot be realized, and the electrical size is large, which cannot meet the requirements of 5G base station antenna beamforming on the electrical small size (0.5 wavelength) of the antenna unit

[0007] The above several dual-polarized antenna units have their own advantages and disadvantages. Although individual indicators have better characteristics, their common defect is that they cannot meet the technical requirements of miniaturized wide-band work, especially as broadband, ultra-low profile, and active integration. None of the base station MIMO system antenna units can meet all technical index requirements

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