CN112751196A - Compact 5G MIMO antenna module and mobile terminal - Google Patents
Compact 5G MIMO antenna module and mobile terminal Download PDFInfo
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- CN112751196A CN112751196A CN202011578043.XA CN202011578043A CN112751196A CN 112751196 A CN112751196 A CN 112751196A CN 202011578043 A CN202011578043 A CN 202011578043A CN 112751196 A CN112751196 A CN 112751196A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/10—Resonant antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
- H01Q5/321—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors within a radiating element or between connected radiating elements
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Abstract
The invention discloses a compact 5G MIMO antenna module and a mobile terminal, wherein the compact 5G MIMO antenna module comprises an antenna pair, the antenna pair comprises a first antenna unit, a second antenna unit and a common radiation branch coupled with the first antenna unit and the second antenna unit respectively, the first antenna unit comprises a first feed branch and a first radiation branch which are connected, the second antenna unit comprises a second feed branch and a second radiation branch which are connected, the first feed branch is connected with a first feed port, the second feed branch is connected with a second feed port, the first feed branch is connected with the second feed branch through a first capacitor, and the first radiation branch is connected with the second radiation branch through a second capacitor; the first feeding branch comprises a first connecting part, the second feeding branch comprises a second connecting part, and the first capacitor is connected with the first connecting part and the second connecting part. This compact 5G MIMO antenna module can guarantee good isolation and realize the wide band when realizing compact structure.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a compact 5G MIMO antenna module and a mobile terminal.
Background
The fifth generation mobile communication (5G) system is in commercial use, and a plurality of mobile phone brand manufacturers have successively introduced mobile phones supporting the 5G sub6-GHz band. The peak rate of the 5G system will increase by several tens of times compared to the fourth generation mobile communication (4G) system. One key technology among these is multiple-input multiple-output (MIMO) technology, i.e., using multiple antennas to increase the channel capacity of the system. In the 4G era, MIMO technology has been widely used, and mobile phones usually employ a 2 × 2 antenna system, i.e., two antennas are used for transmitting and receiving in the same frequency band. In the 5G era, at least 4 × 4 antenna systems were adopted. Currently, 5G mobile phones, such as samsung Galaxy s20 and hua mei 30 pro, all employ 4 × 4MIMO systems in 5G bands.
With the demand for higher wireless communication rate, the number of antennas in the MIMO system will further increase, which brings more challenges to the design of the handset antenna. In a mobile phone, due to limited space, signals between antennas are easy to interfere with each other, which causes the isolation of the antennas to be poor, and further affects the channel capacity of the system.
Throughout the world, China plans that the 3.3GHz-3.6GHz and 4.8GHz-5 GHz frequency bands are the working frequency bands of a 5G system; currently, 3.4GHz-3.8GHz is used as a main frequency band for 5G deployment in the European Union; japan uses 3.6GHz-4.2GHz and 4.4GHz-4.9GHz as the frequency bands of current 5G deployment. Therefore, the mobile communication device needs to realize the full network communication at 5G sub6-GHz, and the antenna is required to have the characteristic of broadband or multi-frequency.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provides a compact 5G MIMO antenna module with good isolation and capable of realizing wide frequency and a mobile terminal
In order to solve the technical problems, the invention adopts the technical scheme that: the compact 5G MIMO antenna module comprises an antenna pair, wherein the antenna pair comprises a first antenna unit, a second antenna unit and a common radiation branch coupled with the first antenna unit and the second antenna unit respectively, the first antenna unit comprises a first feeding branch and a first radiation branch which are connected, the second antenna unit comprises a second feeding branch and a second radiation branch which are connected, the first feeding branch is connected with a first feeding port, the second feeding branch is connected with a second feeding port, the first feeding branch is connected with the second feeding branch through a first capacitor, and the first radiation branch is connected with the second radiation branch through a second capacitor; the first feeding branch is provided with a first connecting part extending towards the second feeding branch at one side close to the second feeding branch, the second feeding branch is provided with a second connecting part extending towards the first feeding branch at one side close to the first feeding branch, and the first capacitors are respectively connected with the first connecting part and the second connecting part.
In order to solve the technical problems, the invention also adopts the following technical scheme: the mobile terminal comprises a PCB (printed circuit board) and a frame, and further comprises the compact 5G MIMO antenna module, wherein the first feed branch, the second feed branch and the first capacitor are respectively arranged on the PCB, and the first radiation branch, the second radiation branch, the common radiation branch and the second capacitor are respectively arranged on the frame.
The invention has the beneficial effects that: in this compact 5G MIMO antenna module, first electric capacity can adjust the odd mode and the influence of dual mode of antenna pair is very little to increase isolation between first, two feed ports, and the second electric capacity can introduce a resonance at the high frequency, thereby increase the odd mode bandwidth of antenna pair, that is to say, this compact 5G MIMO antenna module can guarantee good isolation and realize the wide band when realizing compact structure through the setting of two electric capacities. In addition, the arrangement of the common radiating branch can play a role of introducing resonance and increasing the bandwidth of an odd mode.
Drawings
Fig. 1 is a schematic structural diagram of a partial structure of a mobile terminal according to a first embodiment of the present invention;
FIG. 2 is an enlarged view of detail A in FIG. 1;
fig. 3 is a front view of an antenna pair in the compact 5G MIMO antenna module according to the first embodiment of the present invention;
fig. 4 is a top view (partial structure) of a mobile terminal according to a first embodiment of the present invention;
fig. 5 is a performance diagram of S parameters of an antenna pair in the compact 5G MIMO antenna module according to the first embodiment of the present invention;
fig. 6 is an S parameter diagram of a compact 5G MIMO antenna module according to a first embodiment of the present invention;
fig. 7 is a graph of envelope correlation coefficients of a compact 5G MIMO antenna module according to a first embodiment of the present invention;
fig. 8 is a current distribution diagram of an antenna pair in the compact 5G MIMO antenna module according to the first embodiment of the present invention at 3.5 GHz.
Description of reference numerals:
1. a PCB board;
2. a frame;
3. an antenna pair;
4. a first feed branch; 41. a first connection portion;
5. a first radiating branch; 51. a first extension portion;
6. a second feeding branch; 61. a second connecting portion;
7. a second radiating branch; 71. a second extension portion;
8. a common radiating branch;
9. a first capacitor;
10. a second capacitor;
11. an earth formation;
12. a first feed port;
13. a second feeding port.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1 to 8, a compact 5G MIMO antenna module includes an antenna pair 3, where the antenna pair 3 includes a first antenna element, a second antenna element, and a common radiation branch 8 coupled to the first antenna element and the second antenna element, respectively, the first antenna element includes a first feeding branch 4 and a first radiation branch 5 connected to each other, the second antenna element includes a second feeding branch 6 and a second radiation branch 7 connected to each other, the first feeding branch 4 is connected to a first feeding port 12, the second feeding branch 6 is connected to a second feeding port 13, the first feeding branch 4 and the second feeding branch 6 are connected to each other through a first capacitor 9, and the first radiation branch 5 and the second radiation branch 7 are connected to each other through a second capacitor 10; the first feeding branch 4 has a first connection portion 41 extending toward the second feeding branch 6 on a side close to the second feeding branch 6, the second feeding branch 6 has a second connection portion 61 extending toward the first feeding branch 4 on a side close to the first feeding branch 4, and the first capacitors 9 are respectively connected to the first connection portion 41 and the second connection portion 61.
The structure/working principle of the invention is briefly described as follows: the basic principle is as follows: the closer the odd and even modes of antenna pair 3 are adjusted on the smith chart, the better the isolation between the two. In the technical scheme, the odd-mode bandwidth of the antenna pair 3 is increased through the second capacitor 10, and the position of the odd mode relative to the even mode is adjusted through the first capacitor 9, so that high isolation is realized under a wide frequency. In addition, resonance is introduced by providing a common radiating branch 8, further increasing the odd mode bandwidth.
From the above description, the beneficial effects of the present invention are: in this compact 5G MIMO antenna module, first electric capacity 9 can adjust the odd mode and the influence of dual mode of antenna pair 3 is very little to increase the isolation between first feed port 12 and the second feed port 13, and second electric capacity 10 can introduce a resonance at the high frequency, thereby increase the odd mode bandwidth of antenna pair 3, that is to say, this compact 5G MIMO antenna module passes through the setting of two electric capacities, can guarantee good isolation and realize the wide band when realizing compact structure. In addition, the arrangement of the common radiating branch 8 may serve to introduce resonance, increasing the odd-mode bandwidth.
Furthermore, first radiation branch 5 and second radiation branch 7 all are the style of calligraphy, first radiation branch 5 and second radiation branch 7 parallel and level and the symmetry setting.
Further, the first feeding branch 4 is disposed opposite to the second feeding branch 6.
Further, the common radiation branch 8 is in a straight line shape, and the common radiation branch 8 is located at a side of the first radiation branch 5 away from the first feed branch 4 and is arranged in parallel with the first radiation branch 5.
Further, the length of the first radiating branch 5 is less than or equal to half the length of the common radiating branch 8.
Furthermore, the first radiation branch 5, the second radiation branch 7 and the common radiation branch 8 form a two-letter structure.
Further, an end of the first radiation branch 5 close to the second radiation branch 7 has a first extension portion 51 extending toward the end close to the second radiation branch 7, an end of the second radiation branch 7 close to the first radiation branch 5 has a second extension portion 71 extending toward the end close to the first radiation branch 5, and the second capacitor 10 is respectively connected to the first extension portion 51 and the second extension portion 71.
The mobile terminal comprises a PCB (printed Circuit Board) 1 and a frame 2 and further comprises the compact 5G MIMO antenna module, wherein the first feed branch 4, the second feed branch 6 and the first capacitor 9 are respectively arranged on the PCB 1, and the first radiation branch 5, the second radiation branch 7, the common radiation branch 8 and the second capacitor 10 are respectively arranged on the frame 2.
The above description shows that the mobile terminal has compact structure, good isolation, wide frequency band and excellent antenna performance.
Further, the number of the antenna pairs 3 is four, and the four antenna pairs 3 are arranged oppositely in pairs.
As can be seen from the above description, the designer can set the number of antenna pairs 3 and the specific placement positions of the antenna pairs 3 as desired.
Furthermore, the top surface of the PCB board 1 is provided with the first feeding port 12 and the second feeding port 13, an end of the first feeding branch 4 away from the first radiating branch 5 is connected to the first feeding port 12, and an end of the second feeding branch 6 away from the second radiating branch 7 is connected to the second feeding port 13; the bottom surface of the PCB board 1 is provided with a ground layer 11.
Example one
Referring to fig. 1 to 8, a first embodiment of the present invention is: referring to fig. 1 to 4, the mobile terminal includes, but is not limited to, a mobile phone, a tablet computer, a smart watch, and the like. The mobile terminal comprises a PCB (printed circuit board) 1, a frame 2 and a compact 5G MIMO antenna module, wherein the compact 5G MIMO antenna module comprises at least one antenna pair 3, the antenna pair 3 comprises a first antenna unit, a second antenna unit and a common radiation branch 8 which is respectively coupled with the first antenna unit and the second antenna unit, the first antenna unit comprises a first feed branch 4 and a first radiation branch 5 which are connected, the second antenna unit comprises a second feed branch 6 and a second radiation branch 7 which are connected, the first feed branch 4 is connected with a first feed port 12, the second feed branch 6 is connected with a second feed port 13, the first feed branch 4 is connected with the second feed branch 6 through a first capacitor 9, and the first radiation branch 5 is connected with the second radiation branch 7 through a second capacitor 10.
In this embodiment, the capacitance values of the first capacitor 9 and the second capacitor 10 are 0.2pF, respectively. Of course, in other embodiments, the capacitance values of the first capacitor 9 and the second capacitor 10 may have other values, and the capacitance values may be different. In addition, the compact 5G MIMO antenna module of the present embodiment is an 8 × 8MIMO antenna system, that is, includes four antenna pairs 3, and the four antenna pairs 3 are disposed opposite to each other. In other embodiments, the antenna pairs 3 may also be of other numbers.
As shown in fig. 2, specifically, the first feeding branch 4, the second feeding branch 6 and the first capacitor 9 are respectively disposed on the PCB board 1, and the first radiating branch 5, the second radiating branch 7, the common radiating branch 8 and the second capacitor 10 are respectively disposed on the frame 2. More specifically, the top surface of the PCB board 1 is provided with the first feeding port 12 and the second feeding port 13, an end of the first feeding branch 4 away from the first radiating branch 5 is connected to the first feeding port 12, and an end of the second feeding branch 6 away from the second radiating branch 7 is connected to the second feeding port 13; the bottom surface of the PCB board 1 is provided with a stratum 11, and the stratum 11 is the ground of the compact 5G MIMO antenna module. In this embodiment, the frame 2 is perpendicular to the PCB 1.
Referring to fig. 2 and fig. 4, in this embodiment, the first feeding branch 4 is disposed opposite to the second feeding branch 6. The first radiation branch 5, the second radiation branch 7 and the common radiation branch 8 are all in a straight line shape, the first radiation branch 5 and the second radiation branch 7 are flush and symmetrically arranged, and in detail, the first radiation branch 5 and the second radiation branch 7 are symmetrical relative to a central line of a gap between the first radiation branch 5 and the second radiation branch 7. The common radiating branch 8 is located at a side of the first radiating branch 5 remote from the first feeding branch 4 and is arranged in parallel with the first radiating branch 5.
As shown in fig. 3, the length of the first radiating branch 5 is less than or equal to half the length of the common radiating branch 8. Specifically, the first radiation branch 5, the second radiation branch 7 and the common radiation branch 8 form a two-letter structure. In detail, in the present embodiment, the length of the first radiation branch 5 and the length of the second radiation branch 7 are respectively 13mm, and the length of the common radiation branch 8 is 30 mm.
Referring to fig. 2 and fig. 3, an end of the first radiation branch 5 close to the second radiation branch 7 has a first extension portion 51 extending toward the second radiation branch 7, an end of the second radiation branch 7 close to the first radiation branch 5 has a second extension portion 71 extending toward the first radiation branch 5, and the second capacitor 10 is respectively connected to the first extension portion 51 and the second extension portion 71.
As shown in fig. 2, a side of the first feeding branch 4 close to the second feeding branch 6 is provided with a first connection portion 41 extending toward the second feeding branch 6, a side of the second feeding branch 6 close to the first feeding branch 4 is provided with a second connection portion 61 extending toward the first feeding branch 4, and the first capacitor 9 is respectively connected with the first connection portion 41 and the second connection portion 61. In other words, the first feeding branch 4 and the second feeding branch 6 are respectively in T-shape rotated by 90 ° as a whole. Optionally, as shown in fig. 4, when the mobile terminal is projected along the thickness direction of the PCB 1, the first connection portion 41, the second connection portion 61, and the first capacitor 9 are respectively located in the projection area of the ground layer 11.
Fig. 5 is a diagram of S-parameter performance of antenna pairs in the compact 5G MIMO antenna module. From fig. 5, it can be seen that the reflection coefficient | s11|/| s22| of the antenna pair is less than-8 dB and the isolation is higher than 11dB in the frequency band of 3.3GHz-5 GHz.
Fig. 6 is a S parameter diagram of the compact 5G MIMO antenna module, and it can be seen from fig. 6 that the isolation between the first antenna element and the second antenna element is better than 10dB when the compact 5G MIMO antenna module operates in the 3.3GHz-5GHz working frequency band (as the antenna module has a symmetrical structure, only necessary S parameters are given, the solid line is S11/S22, and the dotted line is the isolation between ports).
Fig. 7 is a graph of Envelope Correlation Coefficient (ECC) of the compact 5G MIMO antenna module. As can be seen from FIG. 7, the ECC values of the 5G MIMO antenna module are less than 0.07 in the working frequency band of 3.3GHz-5 GHz.
To better illustrate the reason for the good isolation between the two antenna ports of the antenna pair, fig. 8 shows the current distribution diagram of the antenna pair at 3.5GHz in the compact 5G MIMO antenna module. As can be seen from fig. 8, when excited from the first feeding port 12, the current is weak close to the second feeding port 13 even though there is a current on the second radiating branch and the second feeding branch. Therefore, when the first antenna element and the second antenna element are in close proximity, the first feeding port 12 and the second feeding port 13 still have good isolation. That is to say, the antenna pair in the compact 5G MIMO antenna module has compact structure and good isolation.
The compact 5G MIMO antenna module adopts the self-decoupling antenna pair, so that the antenna has a compact structure, can ensure good isolation, can cover 3.3-5GHz simultaneously, and has the advantage of wide frequency.
In summary, the compact 5G MIMO antenna module and the mobile terminal provided by the invention can ensure good isolation and realize broadband while realizing compact structure.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (10)
1. Compact 5G MIMO antenna module, including the antenna pair, its characterized in that: the antenna pair comprises a first antenna unit, a second antenna unit and a common radiation branch coupled with the first antenna unit and the second antenna unit respectively, the first antenna unit comprises a first feed branch and a first radiation branch which are connected, the second antenna unit comprises a second feed branch and a second radiation branch which are connected, the first feed branch is connected with a first feed port, the second feed branch is connected with a second feed port, the first feed branch is connected with the second feed branch through a first capacitor, and the first radiation branch is connected with the second radiation branch through a second capacitor; the first feeding branch is provided with a first connecting part extending towards the second feeding branch at one side close to the second feeding branch, the second feeding branch is provided with a second connecting part extending towards the first feeding branch at one side close to the first feeding branch, and the first capacitors are respectively connected with the first connecting part and the second connecting part.
2. The compact 5G MIMO antenna module of claim 1 wherein: the first radiation branch and the second radiation branch are in a straight shape and are parallel and level to each other and symmetrically arranged.
3. The compact 5G MIMO antenna module of claim 2 wherein: the first feeding branch is disposed opposite to the second feeding branch.
4. The compact 5G MIMO antenna module of claim 2 wherein: the common radiation branch is in a straight line shape, and the common radiation branch is positioned on one side of the first radiation branch far away from the first feed branch and is arranged in parallel with the first radiation branch.
5. The compact 5G MIMO antenna module of claim 4 wherein: the length of the first radiating branch is less than or equal to one-half of the length of the common radiating branch.
6. The compact 5G MIMO antenna module of claim 5 wherein: the first radiation branch, the second radiation branch and the common radiation branch form a two-character structure.
7. The compact 5G MIMO antenna module of claim 2 wherein: the first radiating branch has a first extending part extending towards the second radiating branch near one end of the second radiating branch, the second radiating branch has a second extending part extending towards the first radiating branch near one end of the first radiating branch, and the second capacitor is respectively connected with the first extending part and the second extending part.
8. Mobile terminal, including PCB board and frame, its characterized in that: the compact 5G MIMO antenna module as claimed in any of claims 1-6, wherein the first feeding branch, the second feeding branch and the first capacitor are disposed on the PCB respectively, and the first radiating branch, the second radiating branch, the common radiating branch and the second capacitor are disposed on the frame respectively.
9. The mobile terminal of claim 8, wherein: the number of the antenna pairs is four, and the four antenna pairs are arranged oppositely in pairs.
10. The mobile terminal of claim 8, wherein: the top surface of the PCB is provided with the first feed port and the second feed port, one end of the first feed branch, which is far away from the first radiation branch, is connected with the first feed port, and one end of the second feed branch, which is far away from the second radiation branch, is connected with the second feed port; the bottom surface of the PCB is provided with a ground layer.
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| CN202011578043.XA CN112751196B (en) | 2020-12-28 | 2020-12-28 | Compact 5G MIMO antenna module and mobile terminal |
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| CN202011578043.XA CN112751196B (en) | 2020-12-28 | 2020-12-28 | Compact 5G MIMO antenna module and mobile terminal |
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| CN112751196B CN112751196B (en) | 2023-10-13 |
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Cited By (1)
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| CN114122720A (en) * | 2021-10-21 | 2022-03-01 | 南京熊猫电子股份有限公司 | Mobile communication terminal with built-in 5G compact MIMO antenna |
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| CN112751196B (en) | 2023-10-13 |
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