CN209913028U

CN209913028U - Miniaturized MIMO antenna system

Info

Publication number: CN209913028U
Application number: CN201920408333.6U
Authority: CN
Inventors: 罗海涛
Original assignee: Shenzhen Kerrytech Industry Co Ltd
Current assignee: Shenzhen Kerrytech Industry Co Ltd
Priority date: 2019-03-28
Filing date: 2019-03-28
Publication date: 2020-01-07
Anticipated expiration: 2029-03-28

Abstract

A miniaturized MIMO antenna system comprising: the dielectric substrate is rectangular; the antenna units are respectively arranged at four corners of the dielectric substrate; and the decoupling unit is arranged in the middle of the dielectric substrate and is respectively connected with the antenna units positioned at the corners of the dielectric substrate. The beneficial effects of the utility model are that owing to adopt plane monopole antenna structure, four unit antenna in this MIMO antenna system can all realize the broadband radiation. The polarization mode of the single monopole sub-antenna is linear polarization, and the two antennas are orthogonally arranged, so that the coupling between the antenna units is very small, and high isolation of ports between the antenna units is realized. Because the orthogonal polarization technology is adopted, the distance between the two antennas is less than one wavelength, so that the size of the MIMO system comprising the two antenna units is obviously reduced, and the miniaturization effect is realized.

Description

Miniaturized MIMO antenna system

Technical Field

The utility model relates to a miniaturized MIMO antenna system is particularly useful for small-size 5G terminal multi-antenna equipment.

Background

Mobile communication has been one of the most rapidly growing areas in today's society and is also one of the most important areas in people's lives, which have not been able to leave mobile communication. Mobile communication has undergone several generations of revolution, providing unprecedented high efficiency and convenience for people from mobile phones and the internet, and especially in the field of mobile communication, the appearance of electromagnetic waves realizes the leap development from wired communication to wireless communication, and current multimedia communication realizes the transmission of single voice data to integrated image, data, audio and other comprehensive business data. In recent years, with more and more terminal users and wireless data communication services, communication systems provide wider frequency band bandwidth and higher rate data communication services to the wireless, high speed and diversified demands, so that the wireless communication systems play more and more important roles in human life.

In the 4G and 5G communication era, intelligent terminals become main tools for people to connect with the Internet, and particularly in the Internet of things and the Internet of vehicles, the intelligent terminals are required to realize high-reliability and high-speed data transmission. Multiple Input Multiple Output (MIMO) technology is a key technology to solve this problem, and is widely used in base stations and mobile terminals for 4G communication. The MIMO system is characterized in that a transmitter or a receiver has a plurality of antennas, and transmission quality and system capacity can be improved by using multipath properties of a wireless channel without increasing transmission power and system spectrum. For a MIMO system to have a good performance, the antenna elements 2 must be uncorrelated (low coupling), however, the space that can be reserved for antennas in a mobile device is very limited, so that the spatial distance between antennas cannot be larger than or equal to one wavelength. Integrating multiple broadband antennas with low coupling in a portable device is then a relatively difficult problem, especially to reduce the coupling between multiple antennas in a limited space.

Compared with the 4G technology, the number of the 5G terminal antennas is obviously increased, the distance between the two antennas is obviously reduced, and a plurality of MIMO antennas in the same frequency band inevitably generate interference and influence the radiation effect of the antennas.

SUMMERY OF THE UTILITY MODEL

In order to effectively solve the above problems, the utility model provides a miniaturized MIMO antenna system.

The technical scheme of the utility model as follows:

a miniaturized MIMO antenna system comprising:

the dielectric substrate is rectangular;

the antenna units are respectively arranged at four corners of the dielectric substrate;

and the decoupling unit is arranged in the middle of the dielectric substrate and is respectively connected with the antenna units positioned at the corners of the dielectric substrate.

Further, the antenna unit is a microstrip patch antenna, and the antenna unit includes: the feed structure is perpendicular to the side edge of the dielectric substrate, one end of the feed structure is connected with the side edge of the dielectric substrate, the other end of the feed structure is of a snake-shaped bent structure, the radiation metal patch is connected to the middle of the feed structure, the radiation metal patch is bent in an L shape, and the middle of the feed structure is connected with the decoupling unit through a microstrip line.

Further, the antenna unit is arranged by rotating 90 degrees.

Further, the decoupling unit includes: first T font minor matters and second T font minor matters, four first T font minor matters are located the coplanar, four first T font minor matters are angle annular array such as, and are adjacent contained angle 90 degrees between the first T font minor matters, first T font minor matters bottom is connected in a bit, four second T font minor matters are located the coplanar, four second T font minor matters are angle annular array such as, and are adjacent contained angle 90 degrees between the second T font minor matters, second T font minor matters bottom is on the tie point of first T font minor matters, second T font minor matters is 45 with adjacent first T font minor matters contained angle.

Furthermore, the second T-shaped branch is connected with the adjacent antenna unit through a microstrip line.

The beneficial effects of the utility model are that owing to adopt plane monopole antenna structure, four unit antenna in this MIMO antenna system can all realize the broadband radiation. The polarization mode of the single monopole sub-antenna is linear polarization, and the two antennas are orthogonally arranged, so that the coupling between the antenna units 2 becomes very small, and high port isolation between the antenna units 2 is realized. The other characteristics of the four antennas are substantially the same except that the polarization directions are orthogonal. Because the polarization diversity technology is adopted, the distance between the two antennas is less than one wavelength, so that the size of the MIMO system comprising the two antenna units 2 is obviously reduced, and the miniaturization effect is realized. The impedance frequency bandwidth of the antenna is 2GHz (0.7 GHz-2.7 GHz), and the working frequency band comprises a frequency band commonly used in intelligent terminal communication. The maximum radiation directions of the antenna are two directions of plane finding, and uniform omnidirectional radiation can be realized in the two directions. In addition, the metal structures on the two sides of the antenna dielectric substrate 1 are printed, and the process is simple and mature. Medium base plate 1 adopts the FR4 material that the dielectric constant is 4.4 + -3%, and this kind of material is as the most common panel of PCB board, and the low price is easily bought, so, the utility model discloses the cost of manufacture is low, and easily processing can batch production, has great practical application and worth.

Drawings

FIG. 1 is a schematic structural view of the present invention,

fig. 2 is a graph showing the variation of S parameter with frequency of the antenna system of the present invention;

fig. 3 is the isolation curve between the ports of the antenna unit of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the embodiments described herein are only for explaining the present invention and are not intended to limit the present invention, and the drawings are used for the front and the back of the embodiments, and are only used for clarifying the positional relationship and are not intended to limit the present invention.

On the contrary, the invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention as defined by the appended claims. Furthermore, in order to provide a better understanding of the present invention to the public, certain specific details are set forth in the following detailed description of the invention.

As shown in fig. 1, a miniaturized MIMO antenna system includes:

the dielectric substrate 1 is rectangular and used for providing a mounting base;

the antenna units 2 are respectively arranged at four corners of the dielectric substrate 1;

and the decoupling unit 3 is arranged in the middle of the dielectric substrate 1, and the decoupling unit 3 is respectively connected with the antenna units 2 positioned at the corners of the dielectric substrate 1.

Antenna element 2 is microstrip patch antenna, antenna element 2 includes: the feed structure 21 is perpendicular to the side edge of the dielectric substrate 1, one end of the feed structure 21 is connected with the side edge of the dielectric substrate 1, the other end of the feed structure 21 is of a snake-shaped bent structure, the radiation metal patch 22 is connected to the middle of the feed structure 21, the radiation metal patch 22 is bent in an L shape, and the middle of the feed structure 21 is connected with the decoupling unit 3 through a microstrip line.

The adjacent antenna units 2 are arranged by rotating 90 degrees, and are vertically arranged two by two, and the feed ports of the adjacent antenna units 2 are orthogonally arranged, so that the coupling between the ports is reduced. The polarization modes of the two adjacent antenna units 2 are left-hand circular polarization and right-hand circular polarization respectively, and high isolation is achieved by utilizing polarization diversity.

The decoupling unit 3 includes: first T font minor matters 31 and second T font minor matters 32, four first T font minor matters 31 are located the coplanar, four first T font minor matters 31 are equal angle annular array, and are adjacent contained angle 90 degrees between first T font minor matters 31, first T font minor matters 31 bottom is connected in a bit. Four second T font minor matters 32 is located the coplanar, four second T font minor matters 32 is angle annular array such as, and is adjacent contained angle 90 degrees between second T font minor matters 32, second T font minor matters 32 bottom is on the tie point of first T font minor matters 31, second T font minor matters 32 is 45 with adjacent first T font minor matters 31 contained angle. The second T-shaped branch 32 is connected to the adjacent antenna unit 2 via a microstrip line.

The length of the first T-shaped branch 31 is greater than the length of the second T-shaped branch 32.

As shown in fig. 2 and 3, from the results of practical tests, the isolation between two of the four antenna units 2 is below-15 dB, especially the low frequency band 700 and 960 MHz. Has very high use value in practical engineering.

The utility model discloses an antenna system utilizes the electromagnetic wave that two antenna couplings go out to have walked different phase places, has formed the phase difference of a 90 degrees to make the electromagnetic wave that the coupling goes out offset, the structure of decoupling simultaneously can not cause too much influence to the radiation performance of antenna self.

Claims

1. A miniaturized MIMO antenna system, comprising:

the dielectric substrate (1), the dielectric substrate (1) is rectangular;

the antenna units (2) are respectively arranged at four corners of the dielectric substrate (1);

the decoupling unit (3) is arranged in the middle of the dielectric substrate (1), and the decoupling unit (3) is connected with the antenna unit (2) positioned at the corner of the dielectric substrate (1) respectively.

2. The antenna system according to claim 1, characterized in that the antenna unit (2) is a microstrip patch antenna, the antenna unit (2) comprising: feed structure (21) and radiation metal paster (22), feed structure (21) perpendicular to the side of dielectric substrate (1), feed structure (21) one end with the side of dielectric substrate (1) is connected, feed structure (21) other end is snakelike bending structure, radiation metal paster (22) are connected feed structure (21) middle part, radiation metal paster (22) are L shape and buckle, feed structure (21) middle part is passed through microstrip line and is connected with decoupling unit (3).

3. The antenna system according to claim 2, characterized in that the antenna unit (2) is arranged rotated 90 degrees.

4. Antenna system according to claim 2, characterized in that the decoupling unit (3) comprises: first T font minor matters (31) and second T font minor matters (32), four first T font minor matters (31) are located the coplanar, four first T font minor matters (31) are angle annular array such as, adjacent contained angle 90 degrees between first T font minor matters (31), first T font minor matters (31) bottom is connected in a little, four second T font minor matters (32) are located the coplanar, four second T font minor matters (32) are angle annular array such as, adjacent contained angle 90 degrees between second T font minor matters (32), second T font minor matters (32) bottom is on the tie point of first T font minor matters (31), second T font minor matters (32) and adjacent first T font minor matters (31) contained angle are 45.

5. The antenna system according to claim 4, characterized in that the second T-shaped stub (32) is connected to an adjacent antenna element (2) by a microstrip line.