Broadband mimo antenna based on four elements

Abstract

The invention discloses a broadband MIMO antenna based on four units, and mainly aims to solve the problem that the existing MIMO antenna features narrow band, large size and low channel capacity. Thebroadband MIMO antenna includes a dielectric substrate (2), a metal floor (3), and a feed port (4). A radiation layer (1) is arranged on the surface of the dielectric substrate. The radiation layer includes four identical radiation units (11) distributed symmetrically. Each radiation unit includes a feeder (111) and a monopole (112). Each monopole is composed of a fan-shaped metal patch (1121) and an 'L'-shaped metal patch (1122). Each fan-shaped metal patch is disposed outside the position right above the corresponding 'L'-shaped metal patch, and the center is on the extension line of the edge of the corresponding feeder. The upper end of each 'L'-shaped metal patch is connected with the lower end of the corresponding fan-shaped metal patch, and the lower end of each 'L'-shaped metal patch is connected with the upper end of the corresponding feeder. The broadband MIMO antenna is smaller, can work within the band between 2.68GHz and 4.55GHz, and can be used in mobile communication.

Description

[0001] The invention belongs to the technical field of antennas, and in particular relates to a broadband MIMO antenna, which can be used for mobile communication. Background technique [0002] Multiple-input multiple-output system MIMO refers to using multiple transmitting antennas and receiving antennas at the transmitting end and receiving end respectively, so that signals can be transmitted through multiple antennas at the transmitting end and received at the same time by multiple antennas at the receiving end. MIMO technology can take advantage of multipath effects to provide multiplexing gain and space diversity gain for the system, improve the performance of the communication system, and then improve signal stability and channel capacity. Another feature of the MIMO technology is that it can fully utilize the spatial degrees of freedom in the multipath channel without additional bandwidth or power, thereby improving spectrum utilization. Therefore, for today's fifth-gen...

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Problems solved by technology

[0004] In 2016, Shen Dongya of Yunnan University and others invented a 4×4 ultra-wideband MIMO antenna, the patent application publication number is CN106532235A, in which the antenna is composed of a radiation unit, a feeder line and a ground plate, and the dielectric substrate adopts a dielectric constant of 4.4 , FR4 with a loss tangent of 0.02, with a size of 60mm×60mm×1.6mm. By introducing two symmetrical rectangular mesh cross-type isolation structures, the antenna has obtained good isolation performance, but the overall size of the antenna is relatively large , not conducive to installation in terminal equipment

[0005] In 2017, Wu Yanjie and others from Guangdong University of Technology invented a compact high-isolation MIMO antenna. The patent application publication number is CN106374212A. The antenna unit is composed of a radiation unit, a feeder line and a ground plate, and the dielectric substrate is FR4. Polarization diversity and pattern diversity are achieved through the placement of the first unit and the second unit of the antenna to achieve high isolation, but the number of antenna units is 2, resulting in a low channel capacity of the system, which cannot meet the speed requirements of today's communications

[0006] In 2014, Wu Yuting and others from the Seventh Research Institute of China Electronics Technology Group Corporation invented a four-element broadband slot MIMO antenna without decoupling structure. The patent application publication number is CN1O4638365A. The adjacent antenna elements are perpendicular to each other, and no decoupling structure is introduced. It can also obtain high isolation characteristics, but its operating bandwidth is relatively narrow, which cannot meet the needs of the next generation of mobile communications.

[0007] In summary, the currently reported MIMO antennas usually have very narrow bandwidth, relatively low isolation, and relatively large size, while the channel capacity of the two-element MIMO antenna system is usually very low, which cannot meet the needs of the next generation communication system.

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