Compact low-coupling tri-polarized MIMO antenna based on planar structure

Abstract

The invention discloses a compact low-coupling tri-polarized MIMO antenna based on a planar structure, and belongs to the antenna field of communication technology. The antenna is formed by stacking two layers of dielectric plates. The top surface of the upper dielectric plate is coated with a main radiator metal patch. The bottom surface of the lower dielectric plate is a grounding metal plate; aparasitic metal patch is arranged between the two layers of dielectric plates; a plurality of first metal via holes connected with the parasitic metal patch and the main radiator metal patch are formed in the upper dielectric plate; and a plurality of second metal via holes connected with the main radiator metal patch and the grounding metal plate are formed in the two layers of dielectric plates. Feed is carried out at different positions of the main radiator metal patch of the antenna, and three orthogonal polarizations can be realized at the same frequency. Compared with an existing tri-polarized MIMO antenna, the tri-polarized MIMO antenna has smaller size and lower coupling, is more suitable for small terminal equipment, is more suitable for forming an antenna array, and can also beused as a unit of a compact large-scale MIMO antenna.

Description

technical field [0001] The invention designs a compact low-coupling three-polarization MIMO antenna based on a planar structure, and belongs to the antenna field of communication technology. Background technique [0002] The fifth-generation communication technology that has been commercialized indicates that mobile communication is developing in the direction of faster speed, lower bit error rate, shorter delay, and higher channel capacity. In a wireless communication system, by using multiple antennas at the transmitting end and the receiving end at the same time, that is, using Multiple-Input Multiple-Output (MIMO) technology, the communication system can have stable transmission and increased channel capacity. advantage. [0003] A MIMO antenna has been disclosed in the prior art. By adding a certain number of metal vias connecting the metal patch and the grounded metal plate, three orthogonally polarized antennas can be generated by the same radiator. Although this an...

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Problems solved by technology

Although this antenna achieves triple polarization through a single-layer compact structure, there are still two disadvantages: the antenna size is larger than half a wavelength, and the coupling is larger than -13dB

For example, application 201310121176.8 proposes a microstrip antenna loaded with a parasitic ring, which reduces the zenith signal radiation of the traditional microstrip patch antenna through the parasitic ring, increases the low elevation gain near the horizontal plane, and widens the lobes of the vertical plane Width, the antenna consists of two layers of dielectric boards, using a fixed column to separate the two layers of dielectric boards, resulting in a higher overall profile

Application No. 201620584674.5 Add two parasitic patches with a kitchen knife-shaped slot between two antenna radiating elements. By changing the charge distribution on the dielectric plate, the electric field distribution on the antenna radiating element is changed to reduce the antenna radiating element. The purpose of the coupling degree between, however, the two radiating elements of the structure are separated by a certain distance in the horizontal plane, and the horizontal dimension is larger

[0006] These designs of loading parasitic patches on the antenna increase the section height or plane size of the antenna, which is not conducive to the miniaturization of the antenna or the formation of an array antenna

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