CN112751196B - Compact 5G MIMO antenna module and mobile terminal - Google Patents
Compact 5G MIMO antenna module and mobile terminal Download PDFInfo
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- CN112751196B CN112751196B CN202011578043.XA CN202011578043A CN112751196B CN 112751196 B CN112751196 B CN 112751196B CN 202011578043 A CN202011578043 A CN 202011578043A CN 112751196 B CN112751196 B CN 112751196B
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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
-
- 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 public radiation branch which is respectively coupled with the first antenna unit and the second antenna unit, 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 feed branch comprises a first connecting part, the second feed branch comprises a second connecting part, and the first capacitor is connected with the first connecting part and the second connecting part. The compact 5G MIMO antenna module can ensure good isolation and broadband while 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 beginning to be commercially used, and a plurality of handset brands manufacturers have successively introduced handsets 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 in this is Multiple Input Multiple Output (MIMO) technology, i.e., using multiple antennas to boost the channel capacity of the system. In the 4G era, MIMO technology has been widely used, and a 2×2 antenna system is generally used for a mobile phone, that is, two antennas are used for transmitting and receiving in the same frequency band. In the 5G age, at least 4×4 antenna systems were used. The currently proposed 5G handsets, such as the samsung Galaxy s20, hua Mate30 pro, all employ 4×4MIMO systems in the 5G band.
With the higher demands on wireless communication rates, the number of antennas in MIMO systems will further increase, which presents more challenges to the design of handset antennas. In a mobile phone, signals between antennas are easy to interfere with each other due to limited space, so that isolation of the antennas is poor, and channel capacity of a system is affected.
Throughout the world, 3.3GHz-3.6GHz and 4.8GHz-5 GHz frequency bands are working frequency bands of a 5G system; at present, 3.4GHz-3.8GHz is used as a main frequency band for 5G deployment by the European Union; japanese takes 3.6GHz-4.2GHz and 4.4GHz-4.9GHz as the current frequency bands for 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 characteristics of broadband or multifrequency.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: provide a compact 5G MIMO antenna module and mobile terminal that can realize wide band that isolation is good
In order to solve the technical problems, the invention adopts the following technical scheme: 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 public radiation branch which is respectively coupled with the first antenna unit and the second antenna unit, 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 side of the first feeding branch, which is close to the second feeding branch, is provided with a first connecting part extending towards the position close to the second feeding branch, the side of the second feeding branch, which is close to the first feeding branch, is provided with a second connecting part extending towards the position close to the first feeding branch, and the first capacitor is 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 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 the compact 5G MIMO antenna module, the first capacitor can adjust the odd mode of the antenna pair and has little influence on the even mode, so that the isolation between the first feed port and the second feed port is increased, and the second capacitor can introduce resonance at high frequency, so that the odd mode bandwidth of the antenna pair is increased, that is, the compact 5G MIMO antenna module can ensure good isolation and realize broadband while realizing compact structure through the arrangement of the two capacitors. In addition, the arrangement of the common radiating branches may serve to introduce resonance and increase the odd mode bandwidth.
Drawings
Fig. 1 is a schematic structural diagram of a part 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 a compact 5G MIMO antenna module according to a first embodiment of the present invention;
fig. 4 is a top view (partially constructed) of a mobile terminal according to a first embodiment of the present invention;
fig. 5 is an S-parameter performance diagram of an antenna pair in a compact 5G MIMO antenna module according to an 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 an envelope correlation coefficient diagram 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 a compact 5G MIMO antenna module according to a first embodiment of the present invention at 3.5 GHz.
Description of the 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;
6. a second feed branch; 61. a second connecting portion;
7. a second radiating branch; 71. a second extension;
8. a common radiation branch;
9. a first capacitor;
10. a second capacitor;
11. a formation;
12. a first feed port;
13. a second feed port.
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.
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 unit, a second antenna unit, and a common radiating branch 8 coupled to the first antenna unit and the second antenna unit, respectively, the first antenna unit includes a first feeding branch 4 and a first radiating branch 5 that are connected, the second antenna unit includes a second feeding branch 6 and a second radiating branch 7 that are connected, 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 is connected to the second feeding branch 6 through a first capacitor 9, and the first radiating branch 5 is connected to the second radiating branch 7 through a second capacitor 10; the side of the first feed branch 4 close to the second feed branch 6 has a first connection 41 extending towards the second feed branch 6, the side of the second feed branch 6 close to the first feed branch 4 has a second connection 61 extending towards the first feed branch 4, and the first capacitor 9 is connected to the first connection 41 and the second connection 61, respectively.
The structure/working principle of the invention is briefly described as follows: basic principle: the closer the odd and even modes of the antenna pair 3 are adjusted on the smith chart, the better the isolation of 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 broadband. In addition, the odd mode bandwidth is further increased by introducing resonance by providing a common radiating branch 8.
From the above description, the beneficial effects of the invention are as follows: in the compact 5G MIMO antenna module, the first capacitor 9 can adjust the odd mode of the antenna pair 3 and has little influence on the even mode, so that the isolation between the first feed port 12 and the second feed port 13 is increased, the second capacitor 10 can introduce resonance at high frequency, and the odd mode bandwidth of the antenna pair 3 is increased, that is, the compact 5G MIMO antenna module can ensure good isolation and broadband while realizing compact structure through the arrangement of the two capacitors. In addition, the arrangement of the common radiating branch 8 may serve to introduce resonance and increase the odd mode bandwidth.
Further, the first radiating branch 5 and the second radiating branch 7 are both in a straight shape, and the first radiating branch 5 and the second radiating branch 7 are flush and symmetrically arranged.
Further, the first feeding branch 4 is arranged opposite to the second feeding branch 6.
Further, the common radiating branch 8 is in a straight shape, and the common radiating branch 8 is located at a side of the first radiating branch 5 away from the first feeding branch 4 and is parallel to the first radiating 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.
Further, the first radiating branch 5, the second radiating branch 7 and the common radiating branch 8 form a two-character structure.
Further, the end of the first radiating branch 5 near the second radiating branch 7 has a first extension 51 extending toward the end near the second radiating branch 7, the end of the second radiating branch 7 near the first radiating branch 5 has a second extension 71 extending toward the end near the first radiating branch 5, and the second capacitor 10 is connected to the first extension 51 and the second extension 71, respectively.
The mobile terminal comprises a PCB (printed circuit board) 1 and a frame 2, and further comprises the compact 5G MIMO antenna module, wherein a first feed branch 4, a second feed branch 6 and a first capacitor 9 are respectively arranged on the PCB 1, and a first radiation branch 5, a second radiation branch 7, a public radiation branch 8 and a second capacitor 10 are respectively arranged on the frame 2.
From the above description, 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 two by two.
From the above description, the designer can set the number of the antenna pairs 3 and the specific placement positions of the antenna pairs 3 as required.
Further, the top surface of the PCB board 1 is provided with the first feeding port 12 and the second feeding port 13, one end of the first feeding branch 4, which is far away from the first radiating branch 5, is connected to the first feeding port 12, and one end of the second feeding branch 6, which is far away from the second radiating branch 7, is connected to the second feeding port 13; the bottom surface of the PCB 1 is provided with a stratum 11.
Example 1
Referring to fig. 1 to 8, a first embodiment of the present invention is as follows: referring to fig. 1 to 4, mobile terminals, including but not limited to, mobile phones, tablet computers, smart watches, etc. 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 public radiation branch 8 which is respectively coupled with the first antenna unit and the second antenna unit, the first antenna unit comprises a first feeding branch 4 and a first radiation branch 5 which are connected, the second antenna unit comprises a second feeding branch 6 and a second radiation branch 7 which are connected, the first feeding branch 4 is connected with a first feeding port 12, the second feeding branch 6 is connected with a second feeding port 13, the first feeding branch 4 is connected with the second feeding 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 value of the first capacitor 9 and the capacitance value of the second capacitor 10 are respectively 0.2pF. Of course, in other embodiments, the capacitance of the first capacitor 9 and the capacitance of the second capacitor 10 may be other values, and the capacitance of the two 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, where the four antenna pairs 3 are disposed two by two. In other embodiments, the antenna pairs 3 may be 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, one end of the first feeding branch 4, which is far away from the first radiating branch 5, is connected to the first feeding port 12, and one end of the second feeding branch 6, which is far 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. It will be appreciated that in this embodiment, the frame 2 is disposed perpendicular to the PCB board 1.
Referring to fig. 2 and 4, in this embodiment, the first feeding branch 4 is disposed opposite to the second feeding branch 6. The first radiating branch 5, the second radiating branch 7 and the common radiating branch 8 are all in a straight shape, the first radiating branch 5 and the second radiating branch 7 are flush and symmetrically arranged, and in detail, the first radiating branch 5 and the second radiating branch 7 are symmetrical relative to the central line of the gap between the first radiating branch 5 and the second radiating branch 7. The common radiating branch 8 is located on the side of the first radiating branch 5 remote from the first feeding branch 4 and is arranged parallel to the first radiating branch 5.
As shown in fig. 3, the length of the first radiating branch 5 is less than or equal to one half the length of the common radiating branch 8. Specifically, the first radiating branch 5, the second radiating branch 7 and the common radiating branch 8 form a two-character structure. In detail, in the present embodiment, the lengths of the first radiating branch 5 and the second radiating branch 7 are 13mm, respectively, and the length of the common radiating branch 8 is 30mm.
Referring to fig. 2 and 3, an end of the first radiating branch 5 near the second radiating branch 7 has a first extension 51 extending toward the second radiating branch 7, an end of the second radiating branch 7 near the first radiating branch 5 has a second extension 71 extending toward the first radiating branch 5, and the second capacitor 10 is connected to the first extension 51 and the second extension 71, respectively.
As shown in fig. 2, the side of the first feeding branch 4 close to the second feeding branch 6 has a first connection portion 41 extending towards the side close to the second feeding branch 6, the side of the second feeding branch 6 close to the first feeding branch 4 has a second connection portion 61 extending towards the side close to the first feeding branch 4, and the first capacitor 9 is connected to the first connection portion 41 and the second connection portion 61, respectively. In other words, the first feeding branch 4 and the second feeding branch 6 are respectively T-shaped and rotated by 90 °. Alternatively, as shown in fig. 4, when the mobile terminal is projected along the thickness direction of the PCB board 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 an S-parameter performance diagram of an antenna pair in the present compact 5G MIMO antenna module. It can be seen from fig. 5 that the reflection coefficient |s11|/|s22| is smaller than-8 dB and the isolation is higher than 11dB in the frequency band of 3.3GHz-5 GHz.
Fig. 6 is an S parameter diagram of the present compact 5G MIMO antenna module, and as can be seen from fig. 6, the present compact 5G MIMO antenna module operates in a 3.3GHz-5GHz operating frequency band, and the isolation between the first antenna unit and the second antenna unit is better than 10dB (since 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 an Envelope Correlation Coefficient (ECC) diagram of the present compact 5G MIMO antenna module. As can be seen from FIG. 7, the ECC values of the 5G MIMO antenna module are all smaller than 0.07 on the 3.3GHz-5GHz working frequency band.
To better illustrate the reason for the good isolation between the two antenna ports of the antenna pair, fig. 8 shows the current distribution of the antenna pair at 3.5GHz in the present compact 5G MIMO antenna module. As can be seen from fig. 8, when excited from the first feed port 12, the current near the second feed port 13 is weak even though there is current on the second radiating branch and the second feed branch. Therefore, the first antenna unit and the second antenna unit still have good isolation between the first feed port 12 and the second feed port 13 when the first antenna unit and the second antenna unit are close to each other. That is, 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 structure is compact, good isolation can be ensured, 3.3-5GHz can be covered simultaneously, and the antenna module has the advantage of wide frequency band.
In summary, the compact 5G MIMO antenna module and the mobile terminal provided by the present invention can ensure good isolation and broadband while realizing compact structure.
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 (5)
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 public radiation branch which is respectively coupled with the first antenna unit and the second antenna unit, wherein 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 capacitor is connected with the first connecting part and the second connecting part respectively; the first radiation branch and the second radiation branch are in a straight shape, and the first radiation branch and the second radiation branch are parallel and level and are symmetrically arranged; the first feed branch is arranged opposite to the second feed branch; the common radiation branch is in a straight shape, is positioned at one side of the first radiation branch far away from the first feed branch and is arranged in parallel with the first radiation branch; the length of the first radiating branch is less than or equal to one half of the length of the common radiating branch; the first radiation branch, the second radiation branch and the public radiation branch form a two-character structure.
2. The compact 5G MIMO antenna module of claim 1, wherein: the first radiating branch is close to one end of the second radiating branch, the first radiating branch is close to the second radiating branch, the second radiating branch is close to one end of the first radiating branch, the second radiating branch is close to the second radiating branch, the second radiating branch is close to the first radiating branch, the second radiating branch is close to the second radiating branch is the second radiating branch, and the second radiating branch is connected to the second radiating branch.
3. Mobile terminal, including PCB board and frame, its characterized in that: the compact 5G MIMO antenna module of claim 1, wherein the first feeding branch, the second feeding branch, and the first capacitor are respectively disposed on the PCB, and the first radiating branch, the second radiating branch, the common radiating branch, and the second capacitor are respectively disposed on the frame.
4. A mobile terminal according to claim 3, characterized in that: the number of the antenna pairs is four, and the four antenna pairs are arranged in a pairwise manner.
5. A mobile terminal according to claim 3, characterized in that: 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; and a stratum is arranged on the bottom surface of the PCB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011578043.XA CN112751196B (en) | 2020-12-28 | 2020-12-28 | Compact 5G MIMO antenna module and mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011578043.XA CN112751196B (en) | 2020-12-28 | 2020-12-28 | Compact 5G MIMO antenna module and mobile terminal |
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| Publication Number | Publication Date |
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| CN112751196A CN112751196A (en) | 2021-05-04 |
| CN112751196B true CN112751196B (en) | 2023-10-13 |
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| US20130027273A1 (en) * | 2011-07-27 | 2013-01-31 | Tdk Corporation | Directional coupler and wireless communication device |
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