CN109860979B - Mobile terminal applied to 5G communication - Google Patents
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Abstract
The invention discloses a MIMO antenna system and a mobile terminal applied to 5G communication, wherein the antenna system comprises an antenna unit and a feed unit, the antenna unit comprises a first horizontal branch, a second horizontal branch, a tail end branch and a first vertical branch, one end of the first horizontal branch is fixedly connected with one end of the first vertical branch, one end of the second horizontal branch is fixedly connected with the middle part of the first vertical branch, the length value of the first horizontal branch is larger than that of the second horizontal branch, and one end of the tail end branch is fixedly connected with one end of the first horizontal branch far away from the first vertical branch; the feeding unit includes a third horizontal branch and a second vertical branch, the third horizontal branch being disposed adjacent to the second horizontal branch. The antenna system can well cover two frequency bands of 3.3-3.6 GHz and 4.8-5 GHz, and has the advantages of good isolation between antenna units, compact structure and small occupied space.
Description
Technical Field
The present invention relates to the field of antenna technologies, and in particular, to a dual-frequency MIMO antenna system and a mobile terminal for 5G communication.
Background
With the rapid development of wireless communication technology, the fifth generation (5G) wireless communication system will be commercially used in 2020. The 5G wireless communication system will use the following two different primary frequency bands: millimeter wave bands below 6GHz and above 6 GHz. Since the below 6GHz has the advantages of strong operability and mature technology, the below 6GHz 5G antenna system will be preferentially used. In a fourth generation mobile communication (4G) system, a 2×2 Multiple Input Multiple Output (MIMO) antenna has been widely studied and used in a handheld mobile device. Research results in various countries at present show that the peak rate of the 5G communication technology is increased by tens of times compared with that of the current 4G communication technology, so that in order to meet the requirement of the 5G transmission rate, a MIMO antenna system with a larger number of antennas, such as an 8×8 MIMO antenna system, is applied to a handheld device to realize larger channel capacity and better communication quality. In addition, the MIMO antenna system with multiple antenna elements can well solve the multipath fading problem and improve the data throughput.
On the 11 th and 9 th 2017, the national ministry of industry publishes 5G frequency bands, and plans 3.3-3.6 GHz and 4.8-5 GHz frequency bands as working frequency bands of the 5G antenna system, wherein the 3.3-3.4 GHz frequency bands are basically used indoors.
Since the space of a handheld device such as a mobile phone is limited, more antennas will deteriorate the isolation between antennas, and in a MIMO antenna system, the isolation between antennas and the Envelope Correlation Coefficient (ECC) will have a critical effect on the communication system (such as the system channel capacity).
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the MIMO antenna system and the mobile terminal applied to 5G communication are good in isolation.
In order to solve the technical problems, the invention adopts the following technical scheme:
The utility model provides a MIMO antenna system for 5G communication, includes four at least antenna elements, the antenna element includes radiating element and L shape feed unit, the radiating element includes first horizontal branch, second horizontal branch, terminal branch and first vertical branch, first horizontal branch one end with the one end fixed connection of first vertical branch, the one end of second horizontal branch with the middle part fixed connection of first vertical branch, the length value of first horizontal branch is greater than the length value of second horizontal branch, the one end of terminal branch with the one end fixed connection of first horizontal branch keeping away from first vertical branch, the one end of first vertical branch keeping away from first horizontal branch is equipped with the ground point; the feeding unit comprises a third horizontal branch and a second vertical branch, the third horizontal branch is close to the second horizontal branch, and a feeding point is arranged at one end, far away from the third horizontal branch, of the second vertical branch.
Further, the antenna unit further comprises an antenna bracket, and the radiation unit and the feed unit are respectively arranged on the antenna bracket.
Further, the radiating unit and the feeding unit are respectively located on two opposite sides of the antenna support, and the second horizontal branch and the third horizontal branch are provided with overlapping areas in the thickness direction of the antenna support.
Further, the terminal branch is disposed vertically with respect to the first horizontal branch.
Further, the first vertical branch comprises a bending part and a vertical part, the bending part is fixedly connected with the vertical part, the bending part is arranged at an included angle with the vertical part, the first horizontal branch is fixedly connected with the bending part, and the second horizontal branch is fixedly connected with the vertical part.
Further, the included angle is 90 °.
Further, the working frequency ranges of the antenna units are 3.3-3.6 GHz and 4.8-5 GHz respectively.
The invention adopts another technical scheme that:
a mobile terminal comprises the dual-frequency MIMO antenna system applied to 5G communication.
Further, the antenna unit also comprises a PCB board, wherein the shape of the PCB board is rectangular, and the antenna unit is arranged on the long side of the PCB board.
Further, the number of the antenna units is eight.
The invention has the beneficial effects that: the lengths of the first horizontal branch, the second horizontal branch and the tail end branch are adjusted, the distance between the first horizontal branch and the second horizontal branch, the branch length of the feed unit and the like can well cover two frequency bands of 3.3-3.6 GHz and 4.8-5 GHz, the isolation between the antenna units can be good through adjusting the positions and the directions of the antenna units, and the antenna units are compact in structure and small in occupied space. The antenna system is suitable for mobile terminals such as mobile phones, is convenient to manufacture and has low cost.
Drawings
Fig. 1 is a schematic structural diagram of a mobile terminal according to a first embodiment of the present invention;
Fig. 2 is a side view of a dual-frequency MIMO antenna system according to a first embodiment of the present invention;
FIG. 3 is an enlarged schematic view of the structure shown at A in FIG. 1;
FIG. 4 is an enlarged schematic view of the structure shown at B in FIG. 2;
Fig. 5 is a schematic diagram of another overall structure of an antenna unit according to the first embodiment of the present invention;
fig. 6 is an S-parameter diagram of the dual-frequency MIMO antenna system of fig. 1;
fig. 7 is a diagram showing the overall efficiency of a dual-frequency MIMO antenna system according to the first embodiment of the present invention;
Fig. 8 is an envelope correlation coefficient result of a dual-frequency MIMO antenna system according to the first embodiment of the present invention;
Fig. 9 is a channel capacity result of a dual-frequency MIMO antenna system according to the first embodiment of the present invention;
fig. 10 is a current distribution diagram of an antenna unit according to the first embodiment of the present invention when the antenna unit is operated at 3.5 GHz;
fig. 11 is a current distribution diagram of an antenna unit according to the first embodiment of the present invention when the antenna unit is operated at 4.9 GHz;
Fig. 12 is another side view of a dual-frequency MIMO antenna system according to the first embodiment of the present invention;
fig. 13 is another side view of a dual-frequency MIMO antenna system according to the first embodiment of the present invention;
fig. 14 is a diagram showing the isolation test result of a different dual-frequency MIMO antenna system according to the first embodiment of the present invention.
Description of the reference numerals:
1. A PCB board; 2. an antenna unit; 21. a first horizontal branch; 22. a second horizontal branch; 23. a terminal branch; 24. a first vertical branch; 25. a third horizontal branch; 26. a second vertical branch; 27. an antenna support; 241. a bending part; 242. a vertical portion.
Detailed Description
In order to describe the technical contents, the achieved objects and effects of the present invention in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.
The most critical concept of the invention is as follows: the antenna unit comprises an F-shaped radiation unit and an L-shaped feed unit, can well cover two frequency bands of 3.3-3.6 GHz and 4.8-5 GHz, and has good isolation degree.
Referring to fig. 1 to 5, a MIMO antenna system for 5G communication includes at least four antenna units 2, where the antenna units 2 include a radiating unit and an L-shaped feeding unit, the radiating unit includes a first horizontal branch 21, a second horizontal branch 22, a terminal branch 23, and a first vertical branch 24, one end of the first horizontal branch 21 is fixedly connected with one end of the first vertical branch 24, one end of the second horizontal branch 22 is fixedly connected with a middle portion of the first vertical branch 24, a length value of the first horizontal branch 21 is greater than a length value of the second horizontal branch 22, one end of the terminal branch 23 is fixedly connected with one end of the first horizontal branch 21 far from the first vertical branch 24, and one end of the first vertical branch 24 far from the first horizontal branch 21 is provided with a grounding point; the feeding unit comprises a third horizontal branch 25 and a second vertical branch 26, the third horizontal branch 25 being arranged close to the second horizontal branch 22, the end of the second vertical branch 26 remote from the third horizontal branch 25 being provided with a feeding point.
From the above description, the beneficial effects of the invention are as follows: the lengths of the first horizontal branch, the second horizontal branch and the tail end branch are adjusted, the distance between the first horizontal branch and the second horizontal branch, the branch length of the feed unit and the like can well cover two frequency bands of 3.3-3.6 GHz and 4.8-5 GHz, the isolation between the antenna units can be good through adjusting the positions and the directions of the antenna units, and the antenna units are compact in structure and small in occupied space.
Further, the antenna unit 2 further includes an antenna support 27, and the radiating unit and the feeding unit are respectively disposed on the antenna support 27.
As can be seen from the above description, the material of the antenna support can be selected according to the requirement, and can be FR-4 material, or can be plastic support or LCP material which can be laser-plated.
Further, the radiating unit and the feeding unit are respectively located on two opposite sides of the antenna support 27, and the second horizontal branch 22 and the third horizontal branch 25 are provided with overlapping areas in the thickness direction of the antenna support 27.
As can be seen from the above description, the size of the overlapping region can be adjusted as required, and the overlapping region is set to facilitate coupling feeding.
Further, the end branch 23 is arranged vertically with respect to the first horizontal branch 21.
Further, the first vertical branch 24 includes a bending portion 241 and a vertical portion 242, the bending portion 241 is fixedly connected with the vertical portion 242, the bending portion 241 and the vertical portion 242 are disposed at an included angle, the first horizontal branch 21 is fixedly connected with the bending portion 241, and the second horizontal branch 22 is fixedly connected with the vertical portion 242.
As can be seen from the above description, the radiating element may be a bent structure, with the bent portion being on the first vertical branch 24.
Further, the included angle is 90 °.
Further, the working frequency ranges of the antenna unit 2 are 3.3-3.6 GHz and 4.8-5 GHz respectively.
Referring to fig. 1, another technical scheme related to the present invention is as follows:
a mobile terminal comprises the dual-frequency MIMO antenna system applied to 5G communication.
From the above description, the line system is suitable for mobile terminals such as mobile phones, and is convenient to manufacture and low in cost.
Further, the antenna further comprises a PCB 1, the shape of the PCB 1 is rectangular, and the antenna unit 2 is arranged on the long side of the PCB 1.
Further, the number of the antenna units 2 is eight.
From the above description, four antenna units may be disposed on each long side, and the specific placement manner of each antenna unit may be adjusted as required.
Referring to fig. 1 to 14, a first embodiment of the present invention is as follows:
A mobile terminal is shown in fig. 1, and comprises a PCB 1 and a dual-frequency MIMO antenna system applied to 5G communication, wherein the dual-frequency MIMO antenna system comprises at least four antenna units 2, in the embodiment, the number of the antenna units 2 is eight, the shape of the PCB 1 is rectangular, the size of the PCB 1 is 150mm multiplied by 75mm, the antenna units 2 are arranged on the long sides of the PCB 1, each long side is provided with four antenna units 2, and the antenna units 2 on the two long sides are symmetrically arranged relative to the short sides of the PCB 1. As shown in fig. 2, the four antenna elements 2 on each long side are symmetrically structured with respect to the midpoint of the long side. Specifically, the first antenna unit 2 and the second antenna unit 2 from left to right are oriented identically, the third antenna unit 2 and the fourth antenna unit 2 are oriented identically, and the second antenna unit 2 and the third antenna unit 2 are disposed in opposition (i.e., the opening directions are in opposition).
As shown in fig. 3 and 4, the antenna unit 2 includes a radiating unit and an L-shaped feeding unit, where the radiating unit includes a first horizontal branch 21, a second horizontal branch 22, a terminal branch 23, and a first vertical branch 24, one end of the first horizontal branch 21 is fixedly connected with one end of the first vertical branch 24, one end of the second horizontal branch 22 is fixedly connected with a middle portion of the first vertical branch 24, a length value of the first horizontal branch 21 is greater than a length value of the second horizontal branch 22, one end of the terminal branch 23 is fixedly connected with one end of the first horizontal branch 21 far from the first vertical branch 24, preferably, the terminal branch 23 is vertically disposed relative to the first horizontal branch 21, and one end of the first vertical branch 24 far from the first horizontal branch 21 is provided with a grounding point. The feeding unit comprises a third horizontal branch 25 and a second vertical branch 26, the third horizontal branch 25 is arranged close to the second horizontal branch 22, one end of the second vertical branch 26, which is far away from the third horizontal branch 25, is provided with a feeding point, and a microstrip line or a coaxial line can be connected at the feeding point to realize electric connection. In this embodiment, the antenna unit 2 further includes an antenna support 27, and the radiating unit and the feeding unit are respectively disposed on the antenna support 27. Preferably, the radiating unit and the feeding unit are respectively located on two opposite sides of the antenna support 27, and the second horizontal branch 22 and the third horizontal branch 25 are provided with an overlapping area in the thickness direction of the antenna support 27, and the size of the overlapping area can be adjusted as required. In this embodiment, the thickness direction of the antenna support 27 is the direction in which the short side of the PCB board 1 is located, and the first horizontal branch 21 and the second horizontal branch 22 are respectively disposed vertically with respect to the first vertical branch 24, and the first horizontal branch 21 and the second horizontal branch 22 are disposed parallel to each other. When the antenna unit 2 needs to be arranged at a specific position of the mobile terminal, the first horizontal branch 21 and the second horizontal branch 22 are not necessarily parallel to each other, and may be changed at a certain angle.
In another embodiment, as shown in fig. 5, the first vertical branch 24 includes a bending portion 241 and a vertical portion 242, the bending portion 241 is fixedly connected with the vertical portion 242, the bending portion 241 is disposed at an included angle with the vertical portion 242, the first horizontal branch 21 is fixedly connected with the bending portion 241, and the second horizontal branch 22 is fixedly connected with the vertical portion 242. Preferably, the included angle is 90 °. At this time, the second horizontal branch 22 and the third horizontal branch 25 are still provided with an overlapping region in the thickness direction of the antenna support 27.
Fig. 6 is an S-parameter diagram of the dual-frequency MIMO antenna system in fig. 1, and it can be seen from the diagram that the antenna system can well cover the frequency bands of 3.3-3.6 GHz and 4.8-5 GHz, and the isolation between the antenna units is better than 15dB at both low frequency (3.3-3.6 GHz) and high frequency (4.8-5 GHz), and has good isolation performance. (since the antenna element is a symmetrical structure about the PCB board, only the necessary S parameters are given).
Fig. 7 is a graph of the overall efficiency of a dual-frequency MIMO antenna system, from which it can be seen that the overall efficiency of the antenna elements is higher than 60% at low frequencies (3.3-3.6 GHz) and higher than 50% at high frequencies (4.8-5 GHz). The antenna 1 in the figure refers to a first antenna element from left to right in fig. 2, and the antenna 2 refers to a second antenna element from left to right in fig. 2.
Fig. 8 shows the Envelope Correlation Coefficient (ECC) of the dual-band MIMO antenna system, and it can be seen from the figure that the ECC between antenna units is less than 0.06 in the operating frequency band. The antenna 1 in the figure refers to a first antenna element from left to right in fig. 2, the antenna 2 refers to a second antenna element from left to right in fig. 2, and the antenna 3 refers to a third antenna element from left to right in fig. 2.
Channel capacity is a key parameter for measuring a MIMO antenna system, and when calculating the channel capacity of a MIMO antenna, the antenna efficiency should be calculated. Here, assuming that the receiving-end antenna is uncorrelated and lossless, the 8-unit MIMO antenna of the present embodiment serves as a transmitting antenna, and thus an 8-transmit 8-receive (8×8) MIMO transmission system can be formed. Assuming that the transmit power allocation strategy is equal power allocation, the channel is an independent co-distributed rayleigh fading channel, the channel state information is unknown, and the received signal-to-noise ratio (SNR) is 20dB. Fig. 9 shows the channel capacity of a dual-band 8×8MIMO antenna system, and this result is expected for 10000 random channel capacity samples. As can be seen from the figure, the channel capacity of the MIMO antenna system in the operating frequency band is greater than 34bps/Hz, and the channel capacity of the ideal 8×8MIMO antenna system is 44bps/Hz, so that the MIMO antenna system of the present embodiment is very suitable for use in the terminal of the fifth generation mobile communication.
To further explain the working principle of the MIMO antenna system of the present embodiment, fig. 10 and 11 show the current distribution diagrams of the antenna unit operating at the center frequency point of the low frequency and the high frequency, respectively. As can be seen from the figure, the current is mainly distributed over the first vertical branch and the first horizontal and end branches when the antenna element is operating at 3.45 GHz. And the current is mainly distributed on the second horizontal branch, the middle upper part of the first vertical branch, the first horizontal branch and the tail end branch when the antenna works at a high frequency (4.9 GHz).
To better illustrate the superiority of the MIMO antenna of this embodiment, two other antenna layout schemes are shown in fig. 12 and 13, where the antenna positions of the three schemes are the same relative to the PCB board, but the directions of the antenna units are different. In fig. 12, all antenna elements are in the opposite direction to the antenna elements in fig. 2. In fig. 13, the directions of the first antenna element and the fourth antenna element are opposite to those of the antenna element in fig. 2, and the directions of the second antenna element and the third antenna element are the same as those of the antenna element in fig. 2. Fig. 14 shows isolation test results between 3 different arrangements of antenna units, the antenna of the present embodiment shows the antenna system of fig. 2, the antenna system of fig. 12 is shown in scheme 1, and the antenna system of fig. 13 is shown in scheme 2. As can be seen from the graph, the isolation between the antenna units is better than 15dB, and the difference between S12 and S23 in scheme 1 is less than 12dB. In scheme 2, S12 is less than 10dB at low frequencies, although S23 is relatively good. Therefore, in this form of 8-element MIMO system, the arrangement in fig. 2 is the best choice to ensure a balanced isolation between the antenna elements.
The present embodiment only analyzes and describes the antenna operating in the required operating frequency band below 6GHz, but the antenna design principle of the present embodiment can also be extended to other 5G operating frequency bands and other mxn (m and n are integers greater than 2) MIMO antenna systems. Meanwhile, any modification related to the antenna described in the present application (such as bending the first horizontal branch and the second horizontal branch inward by a certain angle, such as 90 °, as shown in fig. 5) is within the scope of protection of the present application.
In summary, the dual-frequency MIMO antenna system and the mobile terminal applied to 5G communication can well cover two frequency bands of 3.3-3.6 GHz and 4.8-5 GHz, and the dual-frequency MIMO antenna system and the mobile terminal have the advantages of good isolation between antenna units, compact structure and small occupied space.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent changes made by the specification and drawings of the present invention, or direct or indirect application in the relevant art, are included in the scope of the present invention.
Claims (7)
1. The mobile terminal comprises a MIMO antenna system applied to 5G communication and a PCB (printed circuit board), and is characterized in that the MIMO antenna system applied to 5G communication comprises eight antenna units, each antenna unit comprises a radiating unit and an L-shaped feed unit, each radiating unit comprises a first horizontal branch, a second horizontal branch, a tail end branch and a first vertical branch, one end of each first horizontal branch is fixedly connected with one end of each first vertical branch, one end of each second horizontal branch is fixedly connected with the middle part of each first vertical branch, the length value of each first horizontal branch is larger than the length value of each second horizontal branch, one end of each tail end branch is fixedly connected with one end of each first horizontal branch far away from each first vertical branch, and one end of each first vertical branch far away from each first horizontal branch is provided with a grounding point; the feeding unit comprises a third horizontal branch and a second vertical branch, the third horizontal branch is arranged close to the second horizontal branch, and a feeding point is arranged at one end of the second vertical branch, which is far away from the third horizontal branch; the shape of the PCB is rectangular, the antenna units are arranged on the long sides of the PCB, four antenna units are arranged on each long side, the antenna units on the two long sides are symmetrically arranged relative to the short sides of the PCB, the four antenna units on each long side are of symmetrical structures relative to the midpoints of the long sides, the directions of the first antenna unit and the second antenna unit from left to right are the same, the directions of the third antenna unit and the fourth antenna unit are the same, and the second antenna unit and the third antenna unit are arranged in opposite directions.
2. The mobile terminal of claim 1, wherein the antenna unit further comprises an antenna bracket, and the radiating unit and the feeding unit are respectively disposed on the antenna bracket.
3. The mobile terminal according to claim 2, wherein the radiating element and the feeding element are respectively located on opposite sides of the antenna support, and the second horizontal branch and the third horizontal branch are provided with overlapping areas in a thickness direction of the antenna support.
4. The mobile terminal of claim 1, wherein the terminal branch is disposed vertically with respect to the first horizontal branch.
5. The mobile terminal of claim 1, wherein the first vertical branch comprises a bending portion and a vertical portion, the bending portion is fixedly connected with the vertical portion, the bending portion is disposed at an included angle with the vertical portion, the first horizontal branch is fixedly connected with the bending portion, and the second horizontal branch is fixedly connected with the vertical portion.
6. The mobile terminal of claim 5, wherein the included angle is 90 °.
7. The mobile terminal of claim 1, wherein the antenna elements have operating frequencies in the range of 3.3-3.6 GHz and 4.8-5 GHz, respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910155987.7A CN109860979B (en) | 2019-03-01 | 2019-03-01 | Mobile terminal applied to 5G communication |
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| CN201910155987.7A CN109860979B (en) | 2019-03-01 | 2019-03-01 | Mobile terminal applied to 5G communication |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110444906B (en) * | 2019-08-27 | 2021-01-26 | 南京邮电大学 | Eight-unit MIMO handheld terminal antenna with 5G frequency band |
| CN111162381B (en) * | 2019-10-10 | 2021-09-07 | 北京邮电大学 | Dual-frequency eight-unit MIMO terminal antenna |
| CN113036416B (en) * | 2021-03-11 | 2021-11-23 | 西安电子科技大学 | Eight-unit MIMO antenna array with low SAR characteristic |
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