CN210006902U

CN210006902U - Compact dual-band 5G MIMO antenna system and mobile terminal

Info

Publication number: CN210006902U
Application number: CN201920717346.1U
Authority: CN
Inventors: 任周游; 赵安平
Original assignee: Shenzhen Sunway Communication Co Ltd
Current assignee: Shenzhen Sunway Communication Co Ltd
Priority date: 2019-05-16
Filing date: 2019-05-16
Publication date: 2020-01-31
Anticipated expiration: 2029-05-16

Abstract

The utility model discloses an compact dual-frenquency 5G MIMO antenna system, including at least two antenna module, the antenna module includes antenna element and second antenna element, 0 antenna element includes 1 radiation component, feed branch and ground branch, radiation component includes radiation branch and second radiation branch, the second antenna element includes second radiation component, second feed branch and ground branch, the second radiation component includes third radiation branch and fourth radiation branch, ground branch is located between radiation component and the second radiation component, feed branch is close to radiation component keeps away from ground branch's end setting, second feed branch is close to the second radiation component keeps away from ground branch's end setting.

Description

Compact dual-band 5G MIMO antenna system and mobile terminal

Technical Field

The utility model relates to an antenna technology field especially relates to kinds of compact dual-frenquency 5G MIMO antenna system and mobile terminal.

Background

With the rapid development of wireless communication technology, a fifth generation (5G) wireless communication system will be commercially used in 2020. the 5G wireless communication system will use two different main frequency bands, i.e., a millimeter wave frequency band below 6GHz and above 6 ghz.a 5G antenna system below 6GHz will be preferentially used because of the advantages of strong operability and technical maturity below 6 ghz.in the fourth generation mobile communication (4G) system, a 2 × 2 Multiple Input Multiple Output (MIMO) antenna system has been extensively studied by and used in handheld mobile devices.

In addition, with the increase of the number of antenna units, how to obtain a MIMO antenna system with better isolation (for example, better than 15dB) is also another challenges in the design of the MIMO antenna system, and the problem of reducing the isolation between the antenna units has been widely researched and discussed by , for example, by adding a spacer between two adjacent antenna units, opening a gap on a PCB board of the antenna system, using a decoupling network, adding a neutralization line with an isolation effect between the antenna units, and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of providing compact dual-frenquency 5G MIMO antenna system and mobile terminal, its compact structure and isolation are good.

In order to solve the technical problem, the utility model discloses a technical scheme be:

A compact dual band 5G MIMO antenna system, comprising at least two antenna assemblies including a th antenna element and a second antenna element, the 0 th antenna element including a 1 th radiating element, a 2 th feed branch and a ground branch, the th radiating element including a th radiating branch and a second radiating branch, the th radiating branch being disposed in correspondence with the second radiating branch, the second antenna element including a second radiating element, a second feed branch and a ground branch, the second radiating element including a third radiating branch and a fourth radiating branch, the third radiating branch being disposed in correspondence with the fourth radiating branch, the ground branch being disposed between the th and second radiating elements, the th feed branch being disposed proximate to a end of the th radiating element remote from the ground branch, the second feed branch being disposed proximate to a end of the second radiating element remote from the ground branch.

, the th radiating element and the second radiating element are symmetrically arranged relative to the ground branch.

, the and second feed branches are symmetrically disposed with respect to the ground branch.

, the and third radiating branches are both in the shape of an inverted U, the second and fourth radiating branches are both in the shape of a U, and the and second feeding branches are both in the shape of a strip.

, the , second, third, fourth, and second radiating branches are each arcuate in shape.

, the antenna assembly further includes an antenna support, the th radiating element, the second radiating element, the ground branch, the th feed branch, and the second feed branch all being located on the same side of the antenna support.

, a th slot is disposed at a end of the th radiating element close to the th feeding branch, a th feeding point is disposed on the th feeding branch, the th slot is disposed close to the th feeding point, a second slot is disposed at an end of the second radiating element close to the second feeding branch, a second feeding point is disposed on the second feeding branch, and the second slot is disposed close to the second feeding point.

, a third slot is formed at a end of the radiating element close to the ground branch, a ground point is arranged on the ground branch, and the third slot is arranged close to the ground point.

The utility model discloses an in addition technical scheme do:

kinds of mobile terminals, comprising the compact dual-band 5G MIMO antenna system.

, the antenna further comprises a PCB, the PCB is rectangular, and the antenna assembly is disposed on the long edge of the PCB.

The beneficial effects of the utility model reside in that antenna unit and the sharing ground branch of second antenna unit not only can improve the isolation between antenna unit and the second antenna unit to make the overall structure of antenna module compacter radiation module and second radiation module all include two radiation branches that correspond the setting, can make the antenna module cover two frequency channels of 3.4 ~ 3.6GHz and 4.8 ~ 5.0GHz simultaneously, the utility model discloses an antenna system, its simple structure, antenna efficiency is high, convenient to use.

Drawings

Fig. 1 is a schematic structural diagram of a mobile terminal according to embodiment of the present invention;

fig. 2 is another schematic diagram of a mobile terminal according to an embodiment of the present invention;

FIG. 3 is an enlarged schematic view of the structure at A in FIG. 1;

fig. 4 is a side view of an antenna assembly of embodiment of the present invention;

fig. 5 is a graph of S parameters for the antenna system of fig. 1;

FIG. 6 is a graph of the overall efficiency of the antenna system of FIG. 1;

fig. 7 is an Envelope Correlation Coefficient (ECC) for the antenna system of fig. 1;

fig. 8 shows the results of channel capacity testing for a 4 x 4MIMO antenna system;

fig. 9 is a current distribution diagram of a th antenna unit according to embodiment of the present invention operating at 3.5 GHz;

fig. 10 is a current distribution diagram of the second antenna unit according to embodiment of the present invention operating at 3.5 GHz;

fig. 11 is a current distribution diagram of the th antenna unit of embodiment of the present invention operating at 4.9 GHz;

fig. 12 is a current distribution diagram of the second antenna unit according to embodiment of the present invention operating at 4.9 GHz.

Description of reference numerals:

1. PCB board, 2, antenna assembly, 20, th radiation branch, 21, second radiation branch;

22. 221, grounding point, 23, feeding branch, 231, feeding point;

24. a third radiation branch, 25, a fourth radiation branch, 26, a second feeding branch, 261, a second feeding point, 27, an antenna support, 28, a th gap, 29, a second gap, 30, a third gap, 3, a microstrip line, 4, a grounding plate.

Detailed Description

In order to explain the technical content, the objects and the effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.

The utility model discloses the most critical concept lies in that antenna unit and the sharing of second antenna unit ground branch, radiation component and second radiation component all include two radiation branches that correspond the setting, and antenna module compact structure just can cover two frequency channels of 3.4 ~ 3.6GHz and 4.8 ~ 5.0GHz simultaneously.

Referring to fig. 1 to 4, a compact dual-band 5G MIMO antenna system includes at least two antenna assemblies 2, where each of the antenna assemblies 2 includes a th antenna element and a second antenna element, each of the 0 th antenna elements includes a 1 th radiating element, a 2 th feeding branch 23 and a grounding branch 22, each of the th radiating elements includes a th radiating branch 20 and a second radiating branch 21, each of the th radiating branches 20 and the second radiating branch 21 are disposed correspondingly, each of the second antenna elements includes a second radiating element, a second feeding branch 26 and a grounding branch 22, each of the second radiating elements includes a third radiating branch 24 and a fourth radiating branch 25, each of the third radiating branch 24 and the fourth radiating branch 25 is disposed correspondingly, each of the grounding branches 22 is disposed between each of the th radiating element and the second radiating elements, each of the feeding branch 23 is disposed close to a end of the th radiating element, and each of the second feeding branch 26 is disposed close to a end of the second radiating element.

From the above description, the beneficial effects of the utility model reside in that the th antenna unit and the second antenna unit share ground branch, not only can improve the isolation between the th antenna unit and the second antenna unit, and make the overall structure of antenna module more compact, th radiation module and second radiation module all include two radiation branches that correspond the setting, can make the antenna module cover two frequency channels of 3.4 ~ 3.6GHz and 4.8 ~ 5.0GHz simultaneously.

, the th and second radiating elements are symmetrically disposed with respect to the ground branch 22.

, the and

second feed branches

23, 26 are symmetrically disposed with respect to the ground branch 22.

It can be seen from the above description that the th radiation element and the second radiation element are symmetrically arranged, and the th feeding branch and the second feeding branch are symmetrically arranged, so that two adjacent antenna units (the th antenna unit and the second antenna unit) can operate in the same frequency band, and of course, according to the arrangement position of the antenna assembly, the lengths of the th feeding branch and the second feeding branch can be respectively adjusted, so that the th antenna unit and the second antenna unit operate in the same frequency band and have better isolation, and at this time, the lengths of the th feeding branch and the second feeding branch are not the same.

, the radiation branch 20 and the third radiation branch 24 are both in the shape of an inverted U, the second radiation branch 21 and the fourth radiation branch 25 are both in the shape of a U, and the feed branch 23 and the second feed branch 26 are both in the shape of a long strip.

, the radiating branch 20, the second radiating branch 21, the third radiating branch 24, the fourth radiating branch 25, the feeding branch 23 and the second feeding branch 26 are all arc-shaped.

As can be seen from the above description, the shapes of the th, second, third and fourth radiation branches can be set and adjusted as desired.

, the antenna assembly 2 further includes an antenna support 27, and the th radiating element, the second radiating element, the ground branch 22, the th feed branch 23, and the second feed branch 26 are all located on the same side of the antenna support 27.

As can be seen from the above description, the material of the antenna bracket may be an FR-4 medium, or a plastic bracket of an LDS antenna. When the medium is FR-4 medium, the antenna unit is a PCB antenna; when the antenna is a plastic support, the antenna is an FPC antenna or an LDS antenna (the LDS antenna needs the plastic support suitable for the laser etching plating process).

, a th slot 28 is disposed at a end of the radiation element close to the th feeding branch 23, a th feeding point 231 is disposed on the th feeding branch 23, the th slot 28 is disposed close to the th feeding point 231, a second slot 29 is disposed at an end of the second radiation element close to the second feeding branch 26, a second feeding point 261 is disposed on the second feeding branch 26, and the second slot 29 is disposed close to the second feeding point 261.

, a third slot 30 is disposed at the end of the radiating element, which is close to the end of the grounding branch 22, a grounding point 221 is disposed on the grounding branch 22, and the third slot 30 is disposed close to the grounding point 221.

The utility model discloses an in addition technical scheme do:

As can be seen from the above description, the compact dual-band 5G MIMO antenna system facilitates more flexible configuration of a multi-antenna system for a mobile terminal.

, the antenna further comprises a PCB board 1, wherein the PCB board 1 is rectangular, and the antenna component 2 is disposed on the long edge of the PCB board 1.

As is apparent from the above description, the antenna assembly may be disposed at both ends of the long side or in the middle.

Example

Referring to fig. 1 to 12, an embodiment of the present invention is:

mobile terminals, including a compact dual-band 5G MIMO antenna system and a PCB board 1, where the PCB board 1 is rectangular and has dimensions of 150mm × 75mm × 0.8mm, the compact dual-band 5G MIMO antenna system includes at least two antenna assemblies 2, and the antenna assemblies 2 are disposed on the long side of the PCB board 1. in this embodiment, the mobile terminal may be a mobile phone, a tablet or other handheld device, as shown in fig. 1, the number of the antenna assemblies 2 is two, and the two antenna assemblies 2 are symmetrically disposed with respect to the short side of the PCB board 1. as shown in fig. 2, the number of the antenna assemblies 2 is four, and certainly, more antenna assemblies 2 may be disposed as needed.

As shown in fig. 3 and 4, the antenna assembly 2 includes a second antenna element and a second antenna element, the second antenna element includes a 0 th radiation element, a 1 st feed branch 23 and a ground branch 22, the 2 nd radiation element includes a 3 rd radiation branch 20 and a second radiation branch 21, the 4 th radiation branch 20 and the second radiation branch 21 are disposed correspondingly, the 5 th radiation branch 20 is shaped like an inverted U, the second radiation branch 21 is shaped like a U, the 6 th radiation branch 20 and the second radiation branch 21 are each composed of three elongated radiation portions connected in sequence, including two vertical portions and 7 horizontal portions, the second antenna element includes a second radiation element, a second feed branch 26 and a ground branch 22, the second radiation element includes a third radiation branch 24 and a fourth radiation branch 25, the third radiation branch 24 and the fourth radiation branch 25 are disposed correspondingly, the third radiation branch 24 is shaped like an inverted U, the fourth radiation branch 25 is shaped like a U, the fourth radiation branch 25 is disposed close to the feed element 23, the second feed element 23 is disposed close to the feed element 23, the feed element 23 is disposed horizontally, the feed element 23 is disposed to the feed element 23, the feed element 23 is disposed horizontally disposed correspondingly, the feed element 23 is disposed to the radiating element 23, the radiating element 23 is disposed correspondingly, the radiating element 23 is disposed to the radiating element, the radiating element 23 is disposed correspondingly, the radiating element is disposed correspondingly, the radiating element 23 is disposed correspondingly, the radiating element 23 is disposed correspondingly, the radiating element is disposed correspondingly, the radiating element is disposed correspondingly, the radiating element 23 is disposed correspondingly, the radiating element is disposed correspondingly, the radiating element is disposed correspondingly, the radiating element is disposed correspondingly, the radiating element is disposed correspondingly, the radiating element is disposed correspondingly disposed.

Fig. 5 is a diagram of S parameters of the antenna system shown in fig. 1, and it can be seen from the diagram that the isolation between the antenna units is better than 17.5dB when the antenna system operates at 3.4 to 3.6GHz, and the isolation between the antenna units is better than 20dB when the antenna system operates at 4.8 to 5GHz (only necessary S parameters are given because the MIMO antenna has a symmetrical structure).

Fig. 6 is a diagram of the total efficiency of the antenna system in fig. 1, in which the antenna 1 is the th antenna unit and the antenna 2 is the second antenna unit, it can be seen from the diagram that the total efficiency is 55% -69% when the antenna system operates at 3.4-3.6 GHz, and the total efficiency is 55% -78% when the antenna system operates at 4.8-5.0 GHz.

Fig. 7 is an Envelope Correlation Coefficient (ECC) of the antenna system of fig. 1, and it can be seen that the ECC between antenna elements is less than 0.15 at both operating bands.

It is assumed here that the receiving end antenna is uncorrelated and lossless, the proposed 4-element MIMO antenna serves as a transmitting antenna, i.e. MIMO transmission systems with 4 transmitting and 4 receiving (4 × 4) can be formed, assuming that the transmission power allocation strategy is equal power allocation, the channel is an independent and identically distributed rayleigh fading channel, the channel state information is unknown, and the received signal-to-noise ratio (SNR) is 20db fig. 8 shows the channel capacity of the proposed dual-band 4 × 4MIMO antenna system (two antenna components), which results in the expectation of 10000 random channel capacity samples.

To better illustrate the reason for the good isolation between the two antenna elements of the antenna assembly, the th antenna element and the second antenna element operate at 3.5GHz current profiles as shown in fig. 9 and 10, respectively.

The current distribution diagrams of the th antenna element and the second antenna element operating at 4.9GHz are shown in FIGS. 11 and 12. it can be seen from the figures that when the th antenna element is excited, the current is mainly concentrated on the lower portion of the th feeding branch, the lower portion of the second radiating branch and the lower portion of the ground branch of the th antenna element, and little current can reach the feeding branch of the second antenna element.

The embodiment only analyzes and describes 5G MIMO operating in 3.4-3.6 GHz and 4.8-5.0 GHz bands under 6GHz, but the antenna design principle of the embodiment can be extended to other 5G operating bands and other MIMO antenna systems with m × n (m and n are integers larger than 2). Meanwhile, any modification related to the antenna described in the present embodiment will be within the protection scope of the present application.

Example two

The second embodiment of the present invention is kinds of mobile terminals, which is different from the second embodiment of in that:

the th radiation branch, the second radiation branch, the third radiation branch, the fourth radiation branch, the th feed branch and the second feed branch are all arc-shaped, and the antenna system can work in a corresponding working frequency range by adjusting parameters such as radian, length and the like of each branch.

To sum up, the utility model provides an kinds of compact dual-frenquency 5G MIMO antenna system and mobile terminal, antenna element's simple structure, isolation between the adjacent antenna element is good, and antenna efficiency is high, can cover two frequency channels of 3.4 ~ 3.6GHz and 4.8 ~ 5.0GHz simultaneously, convenient to use.

The above mentioned is only the embodiment of the present invention, and not the limitation of the patent scope of the present invention, all the equivalent transformations made by the contents of the specification and the drawings, or the direct or indirect application in the related technical field, are included in the patent protection scope of the present invention.

Claims

The compact dual-band 5G MIMO antenna system of claim 1, , comprising at least two antenna assemblies, wherein the antenna assembly includes a th antenna element and a second antenna element, the 0 th antenna element includes a 1 th radiating element, a 2 th feeding branch and a grounding branch, the th radiating element includes a th radiating branch and a second radiating branch, the th radiating branch is disposed corresponding to the second radiating branch, the second antenna element includes a second radiating element, a second feeding branch and a grounding branch, the second radiating element includes a third radiating branch and a fourth radiating branch, the third radiating branch is disposed corresponding to the fourth radiating branch, the grounding branch is disposed between the th radiating element and the second radiating element, the th feeding branch is disposed near a end of the th radiating element far from the grounding branch, and the second feeding branch is disposed near a end of the second radiating element far from the grounding branch.
2. The compact dual-band 5G MIMO antenna system of claim 1, wherein the -th and second radiating elements are symmetrically disposed with respect to the ground branch.
3. The compact dual-band 5G MIMO antenna system of claim 1, wherein the feed branch and the second feed branch are symmetrically disposed with respect to the ground branch.
4. The compact dual-band 5G MIMO antenna system of claim 1, wherein the th and third radiating branches are each in the shape of an inverted U, the second and fourth radiating branches are each in the shape of a U, and the th and second feeding branches are each in the shape of a strip.
5. The compact dual-band 5G MIMO antenna system of claim 1, wherein the th, second, third, fourth, th and second radiating branches are each arc-shaped.
6. The compact dual-band 5G MIMO antenna system of claim 1, wherein the antenna assembly further comprises an antenna mount, and the th radiating element, second radiating element, ground branch, th feed branch, and second feed branch are all located on the same side of the antenna mount.
7. The compact dual-band 5G MIMO antenna system as claimed in claim 1 wherein the th radiating element has a th slot near the end of the th feed branch, the th feed branch has a th feed point, and the th slot is near the th feed point, and the second radiating element has a second slot near the end of the second feed branch, and the second feed branch has a second feed point, and the second slot is near the second feed point.
8. The compact dual-band 5G MIMO antenna system of claim 1, wherein the th radiating element has a third slot near the end of the ground branch, the ground branch having a ground point thereon, the third slot being located near the ground point.
A mobile terminal of , comprising the compact dual-band 5G MIMO antenna system of any of claims 1-8, .
10. The mobile terminal of claim 9, further comprising a PCB board having a rectangular shape, wherein the antenna assembly is disposed on a long side of the PCB board.