Broadband dual-polarized omnidirectional MIMO antenna

Abstract

A small-size omnidirectional broadband dual-polarized MIMO antenna is composed of a horizontal polarization unit and a vertical polarization unit, wherein the horizontal polarization unit and the vertical polarization unit perform independent electric feeding, wherein the horizontal polarization unit is composed of four printed arc-shaped dipoles, a broadband balance-unbalance feed network, four arc-shaped parasitic wires and four double-L-shaped parasitic wires. The vertical polarization unit is composed of a discone, a circular sleeve and a grounded top loading planar ring. The working frequency band of the horizontal polarization unit is 1.7-2.8GHz; 48.9% relative bandwidth and a stable gain of 2.0-2.35dBi can be realized. The working frequency band of the vertical polarization unit is 1.68-2.72GHz; 48.9% relative bandwidth and a stable gain of 2.0-3.5dBi can be realized. Furthermore isolation degree between two radiation units is 25dB. The cross polarizations of the two radiation units are smaller than 20dB. According to the antenna, a horizontal radiation unit has a planar structure and a 50-ohm coaxial cable is utilized for performing electric feeding, and the dimension of the horizontal radiation unit is smaller than 100*100mm<2>; a vertical radiation unit has a discone structure and a 50-ohm coaxial cable is utilized for performing electric feeding, and the size of the vertical radiation unit is smaller than 84*84*22 mm<3>. The broadband dual-polarized omnidirectional MIMO antenna is suitable for a 4G LTE wireless communication system, a network and a base station.

Description

technical field [0001] The present invention relates to antennas Background technique [0002] In recent years, the demand for the speed and stability of signal transmission in wireless communication systems has accelerated. In complex and diverse environments, the dual-polarized omnidirectional radiation MIMO antenna system can significantly improve the communication performance of indoor wireless networks or base stations. A typical dual-polarized MIMO antenna system consists of a horizontally polarized antenna and a vertically polarized antenna. However, this original horizontal antenna cannot meet the bandwidth requirements of 4GLTE. For the vertically polarized unit of the 4GLTEMIMO antenna, the original technology uses a wideband monoconical antenna, which can provide 99% of the relative bandwidth. But it needs a reference ground (diameter 253mm) to generate impedance matching that satisfies the low-frequency end of the operating broadband. This limitation makes thi...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an ideal orthogonally polarized MIMO antenna solution for 4GLTE wireless communication systems, networks and base stations, and to solve the problem that 4GLTE omnidirectional MIMO antennas in the market cannot meet the requirements of 4GLTE bandwidth and miniaturization at the same time. The present invention proposes the design of a broadband omnidirectional two-port MIMO antenna

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