CN110350312A - A kind of 5G mobile terminal mimo antenna based on circuit decoupling - Google Patents
A kind of 5G mobile terminal mimo antenna based on circuit decoupling Download PDFInfo
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- CN110350312A CN110350312A CN201910599124.9A CN201910599124A CN110350312A CN 110350312 A CN110350312 A CN 110350312A CN 201910599124 A CN201910599124 A CN 201910599124A CN 110350312 A CN110350312 A CN 110350312A
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- anneta module
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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
- H01Q1/48—Earthing means; Earth screens; Counterpoises
-
- 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
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
- H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength
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Abstract
The present invention relates to a kind of 5G mobile terminal mimo antennas based on circuit decoupling, are suitable for mobile communication field, including four Anneta modules, a block system floor, one block of medium plate；The physical size of four Anneta modules is identical, about plane of symmetry mirror symmetry；Each Anneta module includes two sub-antennas, two feed ports and a connecting line；Two sub- antennas are placed face-to-face, spacing 2mm；Two feed ports are respectively that two sub-antennas provide the pumping signal with phase and reverse phase；The present invention using the method that distributed circuit decouples solves the problems, such as two antennas, and since spacing is too small, there are close couplings, high isolation is realized in 3400-3600MHz frequency range, and the distributed circuit decoupling method has decoupling circuit simple, it is not take up a day space of lines, the cheap advantage of cost of manufacture has wider application prospect in mobile terminal multi-antenna design.
Description
Technical field
The invention belongs to mobile communication technology fields, are related to Antenna Design, in particular to a kind of 5G based on circuit decoupling
Mobile terminal mimo antenna.
Background technique
In order to meet the needs of applications such as Internet of Things, automatic Pilot, virtual reality, current mobile communication system forward direction
Five generations (5G) standard evolution.The frequency spectrum of 5G mobile communication can be divided into the microwave frequency band and millimeter wave frequency band of sub-6GHz, wherein
3.5GHz frequency range (3400-3600MHz) is decided to be one of the newly-increased frequency range of the following 5G mobile communication.Therefore, development work exists
The mobile terminal antenna of 3.5GHz frequency range is of great significance.
MIMO technology has the potential for significantly improving radio channel capacity.Under conditions of not increasing spectral bandwidth, the skill
Art is simutaneously arranged mutiple antennas in base station end and mobile terminal, improves channel capacity by way of improving the availability of frequency spectrum.This
Need base station end and the mutiple antennas of mobile terminal independent mutually.However, the size of mobile terminal is smaller, and as screen accounts for
The space that can be used for Antenna Design than increasing, inside mobile terminal is fewer and fewer.It is internally integrated in mobile terminal multiple low
The antenna of coupling faces sizable challenge.Currently, academia a variety of decoupling technologies have been proposed reduce by two antennas it
Between coupling, including introduce and neutralize line, increase parasitic branch, the means such as cutting on floor.These technologies can be effectively reduced
Coupling between two antenna ports, but two antennas still need to maintain a certain distance.Circuit decoupling technology can be further
Further the distance between two antennas.The technology reduces the coupling between two antennas by building decoupling circuit.However, mesh
Preceding decoupling circuit is generally required using lamped element.When the working frequency of decoupling circuit is 3.5GHz, lumped capacity or lump
The ghost effect of inductance is obvious, cannot be equivalent with single element, and capacitance or inductance value can be with the variations of frequency
And change.These uncertain factors increase the complexity of decoupling circuit modeling and debugging.
Summary of the invention
In order to overcome the disadvantages of the above prior art, the purpose of the present invention is to provide a kind of 5G shiftings based on circuit decoupling
Dynamic terminal mimo antenna, the spacing of two antennas is smaller, by circuit decoupling, it can be achieved that the high isolation of two feed ports.
To achieve the goals above, the technical solution adopted by the present invention is that:
A kind of 5G mobile terminal mimo antenna based on circuit decoupling, including system floor 5 and medium plate 6, systematically
Plate 5 is printed on the lower surface of medium plate 6, which is characterized in that it is complete to be printed with structure snd size in 6 upper surface of medium plate
Identical Anneta module 1, Anneta module 22, Anneta module 33 and Anneta module 44, the Anneta module 1 include sub- day
One 1a of line, two 1b of sub-antenna, one 1c of feed port, two 1d of feed port and connecting line 1e, one 1a of sub-antenna and sub-antenna
Two 1b are that U-bend rolls over monopole, and the two opening is opposite, there are gap between an arm, are connected between another arm by connecting line 1e,
One 1a of sub-antenna is connected by microstrip line with one 1c of feed port, and two 1b of sub-antenna passes through microstrip line and two 1d phase of feed port
Even, one 1c of feed port and two 1d of feed port is respectively that one 1a of sub-antenna and two 1b of sub-antenna provides the excitation with phase and reverse phase
Signal.
The Anneta module 1 and Anneta module 22 and Anneta module 33 and Anneta module 44 are about dielectric-slab
One perpendicular bisector mirror symmetry of material 6, Anneta module 1 and Anneta module 44 and Anneta module 22 and Anneta module 33
About another perpendicular bisector mirror symmetry of medium plate 6.
One 1a of sub-antenna and two 1b of sub-antenna is that the U-bend of two-arm Length discrepancy rolls over monopole, and the galianconism of the two is opposite,
Between there are gap, it is long-armed opposite, be connected by connecting line 1e, two 1d of feed port is located at two 1b of one 1a of sub-antenna and sub-antenna
On the perpendicular bisector of linking arm.
The galianconism of one 1a of sub-antenna and two 1b of sub-antenna is located at except the main part of medium plate 6.
The Anneta module 1, Anneta module 22, Anneta module 33 and Anneta module 44 size be 25 ×
3.5mm2, each Anneta module is 17.5mm, one 1a of sub-antenna and two 1b of sub-antenna at a distance from 5 apex angle of system floor
Size is identical, is 11.5 × 3.5mm2, the distance in the gap is 2mm.
There are two types of the line widths of each Anneta module, and relatively narrow line width is 1.5mm, and wider line width is 2.5mm.
The shape on the system floor 5 is rectangle, and the main part shape of the medium plate 6 is rectangle, in each day
There is an extension at the edge of wire module present position, and a part of one 1a of sub-antenna and two 1b of sub-antenna are printed in extension
On.
One 1c of feed port and two 1d of feed port is inputted with micro-strip or is directly connected with radio circuit, to avoid
Aperture on system floor 5.
When two 1d of feed port excitation, the path length of electric feed signal to two 1b of one 1a of sub-antenna and sub-antenna are equal,
One 1a of sub-antenna is equal with the FD feed amplitude of two 1b of sub-antenna, phase is identical；When one 1c of feed port excitation, feed letter
Number to two 1b of one 1a of sub-antenna and sub-antenna path length differ half medium wavelength, there are 180 ° of phases for two paths
Difference, the FD feed reverse phase of two 1b of one 1a of sub-antenna and sub-antenna.
Two sub-antennas in each Anneta module can be folded upward at 90 ° along brachium direction, hang down with the edge on system floor 5
It is straight tangent, thus the headroom on each Anneta module and system floor 5 is 0mm.
Compared with prior art, the beneficial effects of the present invention are:
1) the spacing very little between two antennas, only 2mm can effectively reduce area of the antenna in mobile terminal.
2) interport isolation of two antennas is very high, and the isolation of 17dB is realized in 3400-3600MHz frequency range.
3) decoupling circuit size is smaller, and is discrete circuitry, without using lumped inductance or capacitor, reduce antenna at
The complexity of this and decoupling circuit.
Detailed description of the invention
Fig. 1 is the tomograph of the preferred embodiment of the present invention.
Fig. 2 is the top view of mimo antenna in specific embodiment.
Fig. 3 is the size of the Anneta module one of mimo antenna in specific embodiment, and unit is millimeter.
Fig. 4 is the bottom view of mimo antenna in specific embodiment.Fig. 5 be specific embodiment in mimo antenna on the same day
S parameter curve in wire module.
Fig. 6 is the isolation in specific embodiment between mimo antenna different antennae module.
Radiation efficiency when Fig. 7 is mimo antenna different port excitation in specific embodiment.
Fig. 8 is the extended model of mimo antenna in specific embodiment.
Specific embodiment
The present invention is described in further details with reference to the accompanying drawings and examples.
As a preferred embodiment of the present invention, the tomograph of mimo antenna of the present invention is as shown in Figure 1.This
Embodiment includes Anneta module 1, Anneta module 2, Anneta module 3, Anneta module 4, system floor 5 and medium plate 6.Antenna
Module 1, Anneta module 2, Anneta module 3 and Anneta module 4 are printed on the upper surface of medium plate 6, and system floor 5 is printed on Jie
The lower surface of lumber 6.Medium plate 6 is the FR4 plate of low cost, with a thickness of 0.8mm, relative dielectric constant 4.4, loss
Angle is just cut to 0.02.The physical size of four Anneta modules is identical, is 25 × 3.5mm2。
The antenna top view of the present embodiment is as shown in Figure 2 and shown in Fig. 3.Four Anneta modules are about plane of symmetry mirror image pair
Claim.Each Anneta module is 17.5mm at a distance from the apex angle of system floor.Each Anneta module includes two sub-antennas.Four days
Wire module shares 8 antennas and designs for mimo antenna.Anneta module 1 includes two aspectant sub-antenna 1a and 1b.This two
A sub- antenna physical size is identical, is 11.5 × 3.5mm2.The spacing of two sub-antennas is 2mm.Sub-antenna 1a passes through micro-strip
Line is connected with coaxial feed port 1c, and sub-antenna 1b is connected by microstrip line with coaxial feed port 1d.Two sub-antennas pass through
Connecting line 1e is connected.Coaxial feed port 1d is located on the perpendicular bisector of two sub-antennas.There are two types of the line widths of Anneta module 1, compared with
Narrow line width is 1.5mm, and wider line width is 2.5mm.
The antenna bottom view of the present embodiment is as shown in Figure 4.Four protrusions of medium plate 6 do not have metal covering.System
The size on system floor 5 is 140 × 70mm2, it is the handset size of current main-stream.8 round holes are carved on system floor, for giving
4 Anneta module feeds.In actual use, this 8 feed ports can be inputted with micro-strip or are directly connected with radio circuit, from
And avoid the aperture on system floor.
The center operating frequency of the present embodiment is chosen to be 3.5GHz, bandwidth of operation 3400-3600MHz, which is 5G
Mobile communication is in 6GHz newly-increased frequency range below.
The technical scheme of the present invention is realized as follows: being the operating mode of determining each sub-antenna first.Every height day
Line is the monopole radiator of bending, and total length of the monopole from floor edge to open circuit point is that a quarter is situated between in 3.5GHz
Matter wavelength, therefore the work of each sub-antenna is in 0.25 wavelength mode.Followed by realize in any Anneta module two sub-antennas it
Between decoupling.In view of the spacing between two sub-antennas is only 2mm, there are stronger coupling, the present invention to utilize circuit for the two
Decoupling constructs discrete circuitry Decoupling network: when feed port 1d excitation, path length of the electric feed signal to two sub-antennas
Equal, the FD feed amplitude of two sub-antennas is equal, phase is identical.When feed port 1c excitation, electric feed signal is to two
The path length of sub-antenna differs half medium wavelength, and there are 180 ° of phase differences, the feed-ins of two sub-antennas for two paths
Signal inversion.That is port 1d is divided to two-way to two sub- antenna feeds, since symmetrical two-way signal amplitude is naturally equal, port 1c letter
Number also it is divided to two-way to two sub- antennas feeds, due to asymmetry, the amplitude of the two paths of signals branched away from excitation port 1d or 1c
May be unequal, constant amplitude can be realized by adjusting the line width of microstrip line.Therefore, port 1d and port 1c realizes two sons respectively
The same phase and reverse phase of antenna motivate.Since same phase and the antenna pattern of reverse phase excitation are in orthogonal space, therefore two ports can be real
Existing high isolation.
Fig. 5 is the S parameter of two sub-antennas emulation in the same antenna module of the present embodiment mimo antenna.Two sub-antennas
Equal resonance is in 3.5GHz.- 6dB the bandwidth of port 1 is about 680MHz, and -6dB the bandwidth of port 2 is about 280MHz.Two port weights
The bandwidth of conjunction covers 3400-3600MHz frequency band.In the frequency band, the isolation of two ports is higher than 17dB.
The S parameter that Fig. 6 is emulated between the different antennae module of the present embodiment mimo antenna.Any two Anneta module it
Between isolation in 17dB or more.
Fig. 7 is the radiation efficiency of the present embodiment mimo antenna emulation.In the band limits of 3400-3600MHz, port 1
Radiation efficiency when excitation is better than 70%, and radiation efficiency when port 2 is motivated fluctuates between 50% to 65%.
Based on circuit decoupling method of the invention, Fig. 8 extends the present embodiment, this extension is in mobile terminal
It is integrated with eight antenna elements.Fig. 8 is the Anneta module model of four groups of the present embodiment, wherein two sons in each Anneta module
Antenna has bent 90 °, tangent with the edge-perpendicular on system floor, thus the headroom on each Anneta module and system floor is 0mm.
The foregoing is merely presently preferred embodiments of the present invention, not makees restriction in any form to the present invention, it is all
Made equivalent changes and modifications in scope of the invention as claimed, should belong to the covering scope of the claims in the present invention.
Claims (10)
1. a kind of 5G mobile terminal mimo antenna based on circuit decoupling, including system floor (5) and medium plate (6), system
Floor (5) is printed on the lower surface of medium plate (6), which is characterized in that is printed with structure and ruler in medium plate (6) upper surface
Very little identical Anneta module one (1), Anneta module two (2), Anneta module three (3) and Anneta module four (4), the day
Wire module (1) includes sub-antenna one (1a), sub-antenna two (1b), feed port one (1c), feed port two (1d) and connecting line
(1e), the sub-antenna one (1a) and sub-antenna two (1b) are that U-bend rolls over monopole, and the two opening is opposite, between an arm there are
Gap is connected between another arm by connecting line (1e), and sub-antenna one (1a) is connected by microstrip line with feed port one (1c),
Sub-antenna two (1b) is connected by microstrip line with feed port two (1d), and feed port one (1c) and feed port two (1d) are respectively
Pumping signal with phase and reverse phase is provided for sub-antenna one (1a) and sub-antenna two (1b).
2. the 5G mobile terminal mimo antenna according to claim 1 based on circuit decoupling, which is characterized in that the antenna mould
One about medium plate (6) of block one (1) and Anneta module two (2) and Anneta module three (3) and Anneta module four (4)
Perpendicular bisector mirror symmetry, Anneta module one (1) and Anneta module four (4) and Anneta module two (2) and Anneta module three (3) are equal
Another perpendicular bisector mirror symmetry about medium plate (6).
3. the 5G mobile terminal mimo antenna according to claim 1 based on circuit decoupling, which is characterized in that the sub-antenna
One (1a) and sub-antenna two (1b) are that the U-bend of two-arm Length discrepancy rolls over monopole, and the galianconism of the two is opposite, between there are gap,
It is long-armed opposite, it is connected by connecting line (1e), feed port two (1d) is located at sub-antenna one (1a) and sub-antenna two (1b) connection
On the perpendicular bisector of arm.
4. the 5G mobile terminal mimo antenna according to claim 3 based on circuit decoupling, which is characterized in that the sub-antenna
The galianconism of one (1a) and sub-antenna two (1b) are located at except the main part of medium plate (6).
5. the 5G mobile terminal mimo antenna according to claim 1 based on circuit decoupling, which is characterized in that the antenna mould
Block one (1), Anneta module two (2), Anneta module three (3) and Anneta module four (4) size be 25 × 3.5mm2, Mei Getian
Wire module is 17.5mm, the size phase of the sub-antenna one (1a) and sub-antenna two (1b) at a distance from system floor (5) apex angle
It together, is 11.5 × 3.5mm2, the distance in the gap is 2mm.
6. the 5G mobile terminal mimo antenna according to claim 5 based on circuit decoupling, which is characterized in that each day
There are two types of the line widths of wire module, and relatively narrow line width is 1.5mm, and wider line width is 2.5mm.
7. according to claim 1 based on circuit decoupling 5G mobile terminal mimo antenna, which is characterized in that it is described systematically
The shape of plate (5) is rectangle, and the main part shape of the medium plate (6) is rectangle, in each Anneta module present position
Edge have an extension, a part of the sub-antenna one (1a) and sub-antenna two (1b) is printed on extension.
8. the 5G mobile terminal mimo antennas decoupled according to claim 1 or described in 7 based on circuit, which is characterized in that the feedback
Electric port one (1c) and feed port two (1d) are inputted with micro-strip or are directly connected with radio circuit, to avoid on system floor
(5) aperture on.
9. the 5G mobile terminal mimo antenna according to claim 1 based on circuit decoupling, which is characterized in that work as feed port
When two (1d) are motivated, the path length of electric feed signal to sub-antenna one (1a) and sub-antenna two (1b) is equal, sub-antenna one (1a)
It is equal with the FD feed amplitude of sub-antenna two (1b), phase is identical；When feed port one (1c) excitation, electric feed signal to son
The path length of antenna one (1a) and sub-antenna two (1b) differs half medium wavelength, and there are 180 ° of phases for two paths
Difference, the FD feed reverse phase of sub-antenna one (1a) and sub-antenna two (1b).
10. the 5G mobile terminal mimo antenna according to claim 1 based on circuit decoupling, which is characterized in that each antenna
Two sub-antennas in module are folded upward at 90 ° along brachium direction, tangent with the edge-perpendicular of system floor (5), thus each day
The headroom of wire module and system floor (5) is 0mm.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111641040A (en) * | 2020-04-20 | 2020-09-08 | 西安电子科技大学 | Dual-port mobile terminal antenna with self-decoupling characteristic |
| CN112018519A (en) * | 2020-08-31 | 2020-12-01 | 维沃移动通信有限公司 | Antenna structure and electronic equipment |
| CN112751192A (en) * | 2019-10-29 | 2021-05-04 | Oppo广东移动通信有限公司 | MIMO antenna and terminal |
| CN112952368A (en) * | 2021-01-30 | 2021-06-11 | 西安电子科技大学 | Three-port mobile terminal antenna with self-decoupling characteristic |
| CN113193360A (en) * | 2021-05-10 | 2021-07-30 | 西安电子科技大学 | Self-decoupling MIMO antenna based on electromagnetic coupling cancellation |
| CN113224548A (en) * | 2021-04-16 | 2021-08-06 | 南京信息工程大学 | MIMO-intelligent hybrid array antenna system and excitation implementation method thereof |
| CN113381185A (en) * | 2021-05-17 | 2021-09-10 | 南京航空航天大学 | 5G mobile terminal MIMO antenna based on chip integrated module |
| CN113764888A (en) * | 2021-08-09 | 2021-12-07 | 荣耀终端有限公司 | Antenna combination system and terminal equipment |
| CN113972491A (en) * | 2021-12-01 | 2022-01-25 | 南京航空航天大学 | 5G of high isolation removes end MIMO antenna pair |
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