CN105356055B - Aperture-coupled high-isolation polarity diversity mimo antenna - Google Patents
Aperture-coupled high-isolation polarity diversity mimo antenna Download PDFInfo
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- CN105356055B CN105356055B CN201510794582.XA CN201510794582A CN105356055B CN 105356055 B CN105356055 B CN 105356055B CN 201510794582 A CN201510794582 A CN 201510794582A CN 105356055 B CN105356055 B CN 105356055B
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- antenna element
- square
- antenna
- ohm
- radiation patch
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Classifications
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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
-
- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
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- Variable-Direction Aerials And Aerial Arrays (AREA)
- Waveguide Aerials (AREA)
Abstract
The present invention provides a kind of aperture-coupled high-isolation polarity diversity mimo antennas, including antenna element, medium substrate 3 and with the earth plate of defect ground structure, the antenna designed has polarization orthogonal diversity performance, is suitable for the high-isolation mimo antenna of mobile phone terminal, and electric size is small, isolation is high, have the function of that polarity diversity, low manufacture cost can be mass, convenient for integrated processing, there is larger actual application value.
Description
Technical field
The present invention relates to the technical fields of a kind of feed antennas, especially mimo antenna.
Background technology
With the rapid development of wireless communication technique, people's technology more and more stronger to the dependence of wireless terminal, traditional
It can no longer meet the requirement of message transmission rate and quality.In multi-path environment, multiple-input and multiple-output MIMO (Multiple-
Input Multiple-Output) technology can improve wireless channel under the premise of not increasing bandwidth of operation and transmission power
Communication quality and capacity, and be listed in one of the core technology of LTE (Long Term Evolution).
Domestic and foreign scholars are made that many researchs to mimo antenna, such as：Y.Gao et al. devises a centre frequency work
Make in 5.2GHz, to be applied to WLAN, the two unit mimo antenna systems with minimum floor, by correcting, by two antennas it
Between the degree of coupling drop to -28dB or less；Shuai Zhang et al. propose a kind of uncoupling technology for PIFA antennas, utilize one
Kind T-type impedance of slot converter, can effectively be dropped the degree of coupling between single-frequency and the mimo antenna of two-frequency operation
It is low.But above antenna all has the shortcomings that antenna volume is larger, is unfavorable for the demand of current device miniaturization, in addition, day
The isolation of line unit is relatively low, and interference is larger, while not having polarity diversity characteristic.How to design with diversity performance
Miniaturization high-isolation mimo antenna just at we study direction.
Invention content
For overcome the deficiencies in the prior art, the present invention is designed is suitable for mobile phone end with polarization orthogonal diversity performance
The high-isolation mimo antenna at end has following characteristic：Electric size is small, and isolation is high, has the function of polarity diversity and convenient for collection
At processing.
The mimo antenna of the present invention is made of four parts：Antenna element one, antenna element two, medium substrate 3 and with defect
The earth plate 4 of ground structure.
The antenna element one includes that first " T " font, 50 ohm of ports feed coupling line, the antenna element two
Including second " T " font, 50 ohm of ports feed coupling line, antenna element one and antenna element two share square radiation patch
(1c), and antenna element one is identical with two " T " fonts, 50 ohm of port feed coupling linear dimensions of antenna element two,
Any two adjacent edge for choosing square radiation patch (1c), by 50 Europe of " T " font of antenna element one and antenna element two
Nurse port feed coupling line is placed in parallel respectively with two selected sides, and two " T " fonts, 50 ohm of port feed couplings
The distance between line and square radiation patch (1c) are g, i.e. two " T " fonts 50 of antenna element one and antenna element two
Ohm port feed coupling line is respectively parallel to two sides selected by square radiation patch (1c) and is mutually perpendicular to, square
The length of side is L there are one on the angle of two sides composition without 50 ohm of port feed coupling lines of " T " font in radiation patch (1c)ang
Square corner cut 1e, LangValue range be 0.35mm~0.45mm, in the square center radiation patch (1c) position of distance
Set LslAt ot/2, centered on the center of square radiation patch (1c), it is L to dig a length of sideslot, width is the gap of W
Square loop 1d, LslotValue range be 4.50mm~4.90mm, the value range of W is 0.15mm~0.25mm；
Antenna element one and antenna element two are printed on the medium substrate 3, and medium substrate 3 is square, and are used
Relative dielectric constant is 4.4, loss angle tangent 0.02, and thickness is the polytetrafluoroethylene material of h, and the value range of h is 1.5mm
~1.7mm.
The earth plate 4 with defect ground structure is located at the lower section of square medium substrate 3, with defect ground structure
It is L that the center of earth plate 4, which cuts out a length of side,gndpxSquare groove 4a, LgndpxValue range be 2.2mm~2.4mm.
The beneficial effects of the present invention are designed mimo antennas, there is following features：
(1) two antenna element has T-type feed coupling line port orthogonal, and the shared feature of radiation patch makes day
Line electric size greatly reduces, and in the application of the mobile terminals such as mobile phone, small size can greatly reduce occupied space；
(2) couple feed line of the invention and and radiating element be all made of microstrip line, keep antenna section relatively low, and be easy to
Processing.
(3) present invention cuts square corner skill using in the square gap of radiation patch center digging and in radiation patch edge angle
Art, can be significantly greatly increased isolation between antennas, and maximum can reach -35.92dB.
(4) antenna that the present invention designs has stable polarity diversity characteristic, and radiation patch is shared in two antenna elements
In the case of, two antenna elements have the characteristic of linear polarization orthogonal set.
(5) medium substrate of the invention use dielectric constant for 4.4 polytetrafluoroethylene material, it is cheap, be easy to purchase
It buys.
It in conclusion low manufacture cost of the present invention, easy to process, can be mass, there is larger actual application value.
Description of the drawings
Fig. 1 is the structural schematic diagram of antenna designed by the present invention.Fig. 1 (a) is the vertical view of mimo antenna, and Fig. 1 (b) is
The dorsal view of mimo antenna.
Fig. 2 is the emulation S parameter of inventive antenna.
Fig. 3 is the antenna pattern characteristic of inventive antenna, and wherein Fig. 3 (a) is the directions xoz antenna pattern, Fig. 3 (b)
For the directions yoz antenna pattern.
The T-type of 1a- antenna elements one feeds coupling line feed section in figure, and the T-type of 1b- antenna elements one feeds coupling line
Coupling unit, two antenna element square radiation patch of 1c-, the square gap ring that 1d- square radiation patch is opened, 1e- is just
The angle of two sides composition of portless feed coupling line on square-shaped radiation patch, the T-type feed coupling line feedback of 2a- antenna elements two
Electric part, the T-type feed coupling line coupling unit of 2b- antenna elements two, 3- PTFE medium substrates, the floors 4-, 4a-
Plate central opening square groove, LfeedThe T-type of antenna element one and antenna element two feeds coupling line coupling unit length,
WfeedThe T-type of antenna element one and antenna element two feeds coupling line coupling unit width, LportAntenna element one and antenna list
The T-type feed coupling line port feed section length of member two, WportThe feed coupling of the T-type of antenna element one and antenna element two
Line end mouth feed section width, LpatchThe length of side of antenna element one and the shared square radiation patch 1c of antenna element two,
LslotThe length of side for the square gap ring that square radiation patch is opened, the square gap ring width that W- square radiation patch is opened
Degree, LangThe T-type feed coupling of the length of side of square radiation patch square corner cut 1e, g- antenna elements one and antenna element two
The distance between line and radiation patch, LgndpxFloor central opening square groove length, LsubThe length of square medium substrate
Degree, x, y, z- reference axis.
Specific implementation mode
Present invention will be further explained below with reference to the attached drawings and examples.
Mimo antenna designed by the present invention is made of four parts：Antenna element one, antenna element two, 3 He of medium substrate
Earth plate 4 with defect ground structure, as shown in Figure 1, such as following table of structural parameters shown in Fig. 1, unit mm, specific size
Parameter is as shown in table 1：
| Variable | Numerical value | Variable | Numerical value |
| Lgndpx | 2.30±0.10 | Lfeed | 9.80±0.10 |
| Lsub | 14.00±1.00 | Wport | 0.80±0.05 |
| Lpatch | 10.30±0.50 | Lport | 1.21±0.05 |
| Wfeed | 0.80±0.05 | Lslot | 4.70±0.20 |
| Lang | 0.40±0.05 | g | 0.09±0.01 |
| W | 0.20±0.05 |
Table 1
Letter in table 1 represents the geometric dimension parameter in Fig. 1, there is corresponding mark in Fig. 1.
LsubRepresent the length of this mimo antenna medium substrate, LfeedThe T-type of representative antennas unit one and antenna element two is presented
Thermocouple zygonema coupling unit length, WfeedIt is wide that the T-type of representative antennas unit one and antenna element two feeds coupling line coupling unit
Degree, LportThe T-type of representative antennas unit one and antenna element two feeds coupling line port feed section length, WportRepresentative antennas
The T-type of unit one and antenna element two feeds coupling line port feed section width, LpatchRepresent the length of square radiation patch
Degree, LslotThe length of side for the square gap ring that square radiation patch is opened is represented, W represents the square that square radiation patch is opened
Gap ring width, LangRepresent the radiation patch square corner cut length of side, the T-type feed of g representative antennas unit one and antenna element two
The distance between coupling line and radiation patch, LgndpxRepresent floor central opening square groove length.
The antenna element one include first " T " font, 50 ohm of ports feed coupling lines (be 1a shown in Fig. 1 (a),
1b), the antenna element two includes that second " T " font, 50 ohm of ports feed coupling line, antenna element one and antenna element
Two share square radiation patch (1c), and antenna element one and two " T " fonts, 50 ohm of ports of antenna element two are presented
It is electrically coupled that linear dimension is identical, any two adjacent edge of square radiation patch (1c) is chosen, by antenna element one and day
50 ohm of port feed coupling lines of " T " font of line unit two are placed in parallel respectively with two selected sides, and two " T " words
The distance between 50 ohm of port feed coupling lines of type and square radiation patch (1c) are g, i.e. antenna element one and antenna
Two " T " fonts, 50 ohm of port feed coupling lines of unit two are respectively parallel to two selected by square radiation patch (1c)
It a side and is mutually perpendicular to, two sides composition without 50 ohm of ports feed coupling lines of " T " font on square radiation patch (1c)
Angle on there are one the length of side be LangSquare corner cut 1e, LangValue range be 0.35mm~0.45mm, it is square in distance
Shape radiation patch (1c) center position LslotAt/2, centered on the center of square radiation patch (1c), a side is dug
A length of Lslot, width is the gap square loop 1d, L of WslotValue range be 4.50mm~4.90mm, the value range of W is
0.15mm~0.25mm；
Antenna element one feeds coupling line by the one 50 ohm of port and radiation patch (being 1c shown in Fig. 1 (a)) forms.
1a is 50 ohm of T-types feed coupling line feed section of antenna element one, and 1b is the first T-type feed coupling line of antenna element one
Coupling unit, 1a, 1b are disposed vertically the feed line for constituting T-type.1c is that the length of side of antenna element one is LpatchSquare spoke
Penetrate patch, LpatchValue range be 9.8mm~10.8mm, an arbitrary side for choosing square radiation patch, by antenna list
The one 50 ohm of port feed coupling line of member one is placed in parallel with selected side, the one 50 ohm of port feed coupling line and
The distance of square radiation patch 1c is g, and the value range of g is 0.08mm~0.10mm.In the square radiation patch 1c of distance
Center position LslotAt/2, centered on the center of square radiation patch (1c), it is L to dig a lengthslot, width W
Gap square loop 1d, LslotValue range be 4.50mm~4.90mm, the value range of W is 0.15mm~0.25mm,
Energy is coupled to the parts radiation patch 1c by 1b and is radiated, and 1a, 1b, these three parts 1c constitute antenna element one.
Antenna element two is also to feed coupling line (being 2a, 2b shown in Fig. 1 (a)) and radiation patch by 50 ohm of ports
(being 1c shown in Fig. 1 (a)) composition, 2a are 50 ohm of T-types feed coupling line feed sections of antenna element two, and 2b is antenna list
The T-type of member two feeds coupling line coupling unit, and 2a, 2b are disposed vertically the feed line for constituting T-type.Two antenna elements share same
One radiation patch 1c, can greatly reduce antenna size, realize the purpose of miniaturization, in addition, choosing square radiation patch
50 ohm of ports of antenna element two are fed coupling by a line adjacent with 50 ohm of ports of antenna element one feed coupling line
Zygonema is placed in parallel with selected side, between 50 ohm of port feed coupling lines of " T " font and square radiation patch (1c)
Distance also be g.The value range of g is 0.08mm~0.10mm.The port feed coupling line of such two antenna element is also mutual
Vertically, to make antenna that there is orthogonal set characteristic.Two side groups of coupling line are fed in square radiation patch 1c portless
At angle on, cut off a length of LangSquare corner 1e, LangValue range be 0.35mm~0.45mm.It is pasted above in radiation
The square gap ring 1d and corner cut 1e cut out on piece 1c has the function of improving two antenna element isolations.
Antenna element one and antenna element two, it is L to be printed on sizesub*Lsub, relative dielectric constant 4.4, thickness h,
On the PTFE medium substrate 3 that loss angle tangent is 0.02, the value range of h is 1.5mm~1.7mm, LsubValue model
It encloses for 13.00mm~15.00mm, material property is preferable, easy to process, and production cost is relatively low.
3 lower surface of medium substrate is connected with earth plate 4.
Shown in the structure of antenna ground plate 4 such as Fig. 1 (b).It is L to cut out the length of side in 4 center of earth plate of antennagndpxJust
Square groove 4a, LgndpxValue range be 2.20mm~2.40mm, square groove 4a can effectively reduce two antennas and exist
The surface current to intercouple on floor, to effectively reduce the port degree of coupling, to reduce the Space Coupling of two antennas
Degree finally improves the interport isolation of two antennas.
Simulation optimization is carried out to antenna model with electromagnetic simulation software HFSS, dimensional parameters is determined, obtains the echo of antenna
Damage curve, Fig. 2 are the simulated return loss figure of antenna, and Fig. 3 (a) is mimo antenna xoz antenna patterns, and Fig. 3 (b) is MIMO
Antenna yoz antenna patterns.As can be seen that the mimo antenna that the present invention designs has the characteristic of polarity diversity, and this antenna
Characteristic with high-isolation.To verify the exploitativeness of the present invention.
Claims (1)
1. a kind of aperture-coupled high-isolation polarity diversity mimo antenna, including antenna element one, antenna element two, medium
Substrate (3) and earth plate (4) with defect ground structure, it is characterised in that：
The antenna element one includes that first " T " font, 50 ohm of ports feed coupling line, and the antenna element two includes
Second 50 ohm of " T " font port feeds coupling line, and antenna element one and antenna element two share square radiation patch (1c),
And antenna element one is identical with two " T " fonts, 50 ohm of port feed coupling linear dimensions of antenna element two, chooses
Any two adjacent edge of square radiation patch (1c), by 50 ohm of ends of " T " font of antenna element one and antenna element two
Mouthful feed coupling line is placed in parallel respectively with two selected sides, and two " T " fonts, 50 ohm of ports feed coupling lines and
The distance between square radiation patch (1c) is g, i.e. two 50 ohm of " T " fonts of antenna element one and antenna element two
Port feed coupling line is respectively parallel to two sides selected by square radiation patch (1c) and is mutually perpendicular to, square radiation
The length of side is L there are one on the angle of two sides composition without 50 ohm of port feed coupling lines of " T " font on patch (1c)angJust
Rectangular corner cut 1e, LangValue range be 0.35mm~0.45mm, in square radiation patch (1c) center position of distance
LslotAt/2, centered on the center of square radiation patch (1c), it is L to dig a length of sideslot, width is that the gap of W is square
Shape ring 1d, LslotValue range be 4.50mm~4.90mm, the value range of W is 0.15mm~0.25mm；
Antenna element one and antenna element two are printed on the medium substrate (3), and medium substrate (3) is square, and are used
Relative dielectric constant is 4.4, loss angle tangent 0.02, and thickness is the polytetrafluoroethylene material of h, and the value range of h is 1.5mm
~1.7mm；
The earth plate (4) with defect ground structure is located at the lower section of medium substrate (3), in the earth plate with defect ground structure
(4) it is L that center, which cuts out a length of side,gndpxSquare groove 4a, LgndpxValue range be 2.2mm~2.4mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510794582.XA CN105356055B (en) | 2015-11-18 | 2015-11-18 | Aperture-coupled high-isolation polarity diversity mimo antenna |
Applications Claiming Priority (1)
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| CN201510794582.XA CN105356055B (en) | 2015-11-18 | 2015-11-18 | Aperture-coupled high-isolation polarity diversity mimo antenna |
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| Publication Number | Publication Date |
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| CN105356055A CN105356055A (en) | 2016-02-24 |
| CN105356055B true CN105356055B (en) | 2018-09-07 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106374212B (en) * | 2016-11-09 | 2023-05-05 | 广东工业大学 | Compact high-isolation MIMO antenna |
| CN108321489A (en) * | 2017-01-17 | 2018-07-24 | 中兴通讯股份有限公司 | A kind of mimo antenna and terminal |
| CN109980338B (en) * | 2017-12-27 | 2020-11-17 | 惠州硕贝德无线科技股份有限公司 | Be applied to miniaturized MIMO antenna of intelligent terminal equipment radiation plane sharing |
| CN108695597B (en) * | 2018-06-20 | 2024-02-06 | 中天宽带技术有限公司 | Dual-polarized patch antenna unit with hollow structure |
| CN109411881A (en) * | 2018-11-09 | 2019-03-01 | 榆林学院 | A kind of wideband monopole sub-antenna with arc couple feed structure |
| CN110957576B (en) * | 2019-12-25 | 2021-01-26 | 电子科技大学 | Ultra-low profile microstrip laminated dual-polarized base station antenna and array |
| CN112201951B (en) * | 2020-09-28 | 2023-03-10 | 上海摩勤智能技术有限公司 | Multi-antenna layout structure of antenna bracket and mobile terminal |
| CN113922075B (en) * | 2021-10-13 | 2023-09-19 | 西华大学 | Slow wave substrate integrated waveguide duplex antenna based on high-order mode |
| CN115101925A (en) * | 2022-06-27 | 2022-09-23 | 湖北大学 | Multi-frequency broadband PIFA antenna based on defected ground |
| WO2024092412A1 (en) * | 2022-10-31 | 2024-05-10 | 京东方科技集团股份有限公司 | Dual-frequency antenna, antenna array, and electronic device |
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| WO2012170481A1 (en) * | 2011-06-06 | 2012-12-13 | University Of Dayton | Miniaturized and reconfigurable cpw square-ring slot antenna including ferroelectric bst varactors |
| CN104993233A (en) * | 2015-07-17 | 2015-10-21 | 中国科学院上海高等研究院 | A high-isolation micro-strip patch MIMO antenna having the characteristic of radiation mode diversity |
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|---|---|---|---|---|
| WO2012170481A1 (en) * | 2011-06-06 | 2012-12-13 | University Of Dayton | Miniaturized and reconfigurable cpw square-ring slot antenna including ferroelectric bst varactors |
| CN104993233A (en) * | 2015-07-17 | 2015-10-21 | 中国科学院上海高等研究院 | A high-isolation micro-strip patch MIMO antenna having the characteristic of radiation mode diversity |
Non-Patent Citations (1)
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| "A Dual-Band Polarized Diversity microstrip MIMO Antenna with High Isolation for WLAN Application";Li, Haixiong等;《2016 11th International Symposium on Antennas, Propagation and EM Theory (ISAPE)》;20161021;第88-91页 * |
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