CN115275599A - Shared self-isolation MIMO antenna - Google Patents
Shared self-isolation MIMO antenna Download PDFInfo
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- CN115275599A CN115275599A CN202210843781.5A CN202210843781A CN115275599A CN 115275599 A CN115275599 A CN 115275599A CN 202210843781 A CN202210843781 A CN 202210843781A CN 115275599 A CN115275599 A CN 115275599A
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- 238000002955 isolation Methods 0.000 title claims abstract description 23
- 239000002184 metal Substances 0.000 claims abstract description 42
- 239000000758 substrate Substances 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 15
- 238000005516 engineering process Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
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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
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/28—Adaptation for use in or on aircraft, missiles, satellites, or balloons
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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
- H01Q21/00—Antenna arrays or systems
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- Engineering & Computer Science (AREA)
- Astronomy & Astrophysics (AREA)
- Aviation & Aerospace Engineering (AREA)
- General Physics & Mathematics (AREA)
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- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The invention relates to the technical field of MIMO antenna self-isolation, and discloses a shared self-isolation MIMO antenna, which comprises a floor, a dielectric substrate, a metal frame and eight unit antennas, wherein the dielectric substrate is arranged above the floor, the floor is connected with the dielectric substrate into a cuboid shape through the metal frame, the eight unit antennas are pairwise connected into a group to form four groups of unit antenna pairs by sharing one radiator, two groups of unit antenna pairs are arranged on two sides of a long frame of the metal frame, no decoupling element is added between any two ports of the four groups of unit antenna pairs, and the two ports of the unit antenna pairs share the radiator. The antenna array structure not only meets the bandwidth requirement, but also reduces the duty ratio of the antenna by the co-radiation self-isolation structure, simplifies the space structure and is convenient for placing other structures or functional components. And the ECC of any two ports is far smaller than a standard value, so that the influence among all unit antennas in the MIMO antenna array is smaller, and the antennas can work well.
Description
Technical Field
The invention relates to the technical field of MIMO antenna self-isolation, in particular to a shared self-isolation MIMO antenna.
Background
With the development of modern war, the intelligent interaction of the aircraft is more important, and meanwhile, a higher information transmission rate is required to ensure the intelligent development. The massive data stream is constructed by a large-scale multiple-input multiple-output (MIMO) technology through a plurality of transmitting and receiving antennas, and the information transmission rate can be obviously improved by applying the MIMO technology to a communication terminal of an aircraft. However, in practical application of MIMO technology, the most important issue to be solved is the isolation between antennas, so as to ensure normal operation between antenna units. For an aircraft receiving terminal, the very limited space and the very high environmental complexity make it difficult to ensure the normal operation of the antenna, and it is difficult to place multiple antennas; the existing co-radiation self-isolation structure is complex, the simplification degree is low, the duty ratio of the antenna is large, other structures or functional parts are not convenient to place, and the influence among all unit antennas is large.
Disclosure of Invention
The present invention is directed to overcome the deficiencies of the prior art and to provide a shared self-isolated MIMO antenna for solving the deficiencies of the background art.
The purpose of the invention is realized by the following technical scheme: the utility model provides a sharing is from keeping apart MIMO antenna, includes floor, dielectric substrate, metal frame and eight unit antenna, the dielectric substrate sets up the top on floor, the floor pass through the metal frame with the dielectric substrate connects into the cuboid shape, eight two liang of unit antenna forms four groups of unit antenna pairs for a radiating body of a set of sharing, the long frame both sides of metal frame all are provided with two sets ofly the unit antenna pair, four groups no decoupling zero component is added between arbitrary both ends mouth of unit antenna pair, the unit antenna is to the radiating body of both ends mouth sharing.
The antenna array structure has the advantages that the antenna array structure not only meets the bandwidth requirement, but also reduces the duty ratio of the antenna by the aid of the co-radiation self-isolation structure, simplifies the space structure and is convenient for placing other structures or functional components. And the ECC of any two ports is far smaller than a standard value, so that the influence among all unit antennas in the MIMO antenna array is smaller, and the antennas can work well.
Further, the irradiator includes cross gap, floor gap and two L type gaps, seted up on the metal frame cross gap and two L type gap, two L type gap for the cross gap symmetry sets up, the floor gap is seted up on the floor, and is located under the cross gap, the top of metal frame is provided with the top sheetmetal, the top sheetmetal perpendicular to the side of metal frame, the longitudinal gap department in cross gap is provided with two sheetmetals relatively, the sheetmetal perpendicular to the cross gap.
Further, L type gap comprises long gap and short gap perpendicularly, the long 10mm in long gap, long gap is located the below of the horizontal gap in cross gap, the long 4mm in short gap, short gap is located one side in cross gap.
Further, the length of the transverse gap of the cross-shaped gap is 19mm, and the length of the longitudinal gap of the cross-shaped gap is 7mm.
Further, the floor gap length is 28mm.
Further, the width of the cross-shaped gap, the width of the floor gap and the width of the L-shaped gap are all 2mm.
Further, the floor is 150mm long, 75 mm's wide rectangle shape, the floor is the metal material.
Furthermore, the medium substrate is made of FR-4 material (epsilon)r=4.4,tan δ = 0.02), the thickness of the dielectric substrate being 0.8mm, the dielectricThe shape and size of the base plate are the same as those of the floor board.
Further, the height of metal frame is 7mm.
Further, the unit antenna pair includes a feeder unit, the feeder unit is disposed at the bottom of the metal frame, and the feeder unit is fed by a microstrip line.
The invention has the beneficial effects that:
the antenna array structure provided by the invention not only meets the bandwidth requirement, but also reduces the duty ratio of the antenna by the co-radiation self-isolation structure, simplifies the space structure and is convenient for placing other structures or functional components. And the ECC of any two ports is far smaller than a standard value, so that the influence among all unit antennas in the MIMO antenna array is smaller, and the antennas can work well.
Drawings
FIG. 1 is a general diagram of an array of shared self-isolated MIMO antennas according to the present invention
FIG. 2 is a top view of an array sharing a self-isolating MIMO antenna according to the present invention
Fig. 3 is a schematic diagram of a slot of a metal frame in a shared self-isolation MIMO antenna according to the present invention;
FIG. 4 is a schematic diagram of a structure of a pair of antennas of a shared self-isolation MIMO antenna according to the present invention;
fig. 5 is a schematic diagram of surface currents of a left port feed antenna pair in a shared self-isolation MIMO antenna according to the present invention;
FIG. 6 is a schematic diagram of S parameters of a shared self-isolating MIMO antenna according to the present invention;
FIG. 7 is a schematic diagram of a shared self-isolating MIMO antenna pattern according to the present invention;
FIG. 8 is a diagram illustrating the efficiency of a shared self-isolating MIMO antenna according to the present invention;
FIG. 9 is a schematic diagram of Envelope Correlation Coefficients (ECC) of a shared self-isolated MIMO antenna according to the present invention;
in the figure, 1-floor, 2-dielectric substrate, 3-metal frame, 4-unit antenna pair, 5-cross slot, 6-L slot, 7-floor slot, 8-upper metal sheet, 9-metal sheet and 10-feeder unit.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following descriptions.
As shown in fig. 1 to 4, a shared self-isolation MIMO antenna includes a floor 1, a dielectric substrate 2, a metal frame 3 and eight unit antennas, wherein the dielectric substrate 2 is disposed above the floor 1, the floor 1 is rectangular with a length of 150mm and a width of 75mm, and the floor 1 is made of metal; the dielectric substrate 2 is made of FR-4 material (epsilon)r=4.4, tan δ = 0.02), the thickness of the dielectric substrate 2 is 0.8mm, and the shape and size of the dielectric substrate 2 are the same as those of the floor board 1; the height of the metal frame 3 is 7mm; the floor 1 is connected with a medium substrate 2 through a metal frame 3 to form a cuboid shape, the cuboid shape is 150mm long, 75mm wide and 7mm high, eight unit antennas are pairwise formed into a group to share a radiator to form four groups of unit antenna pairs 4, two groups of unit antenna pairs 4 are arranged on two sides of the long frame of the metal frame 3, the distance between the two groups of unit antenna pairs 4 on the same side is 80mm, no decoupling element is added between any two ports of the four groups of unit antenna pairs 4, the unit antennas are slotted on the side of the metal frame 3 to form an antenna radiator, and the two ports of the unit antenna pairs 4 share the radiator, so that the antenna array structure not only meets the bandwidth requirement, but also the duty ratio of the antennas is reduced through a common radiation self-isolation structure, the space structure is simplified, and other structures or functional components are convenient to place. And the ECC of any two ports is far smaller than a standard value, so that the influence among all unit antennas in the MIMO antenna array is smaller, and the antennas can work well.
Further, as shown in fig. 1 and 4, the radiator includes a cross-shaped gap 5, a floor gap 7 and two L-shaped gaps 6, a cross-shaped gap 5 and two L-shaped gaps 6 are provided on the metal frame 3, the two L-shaped gaps 6 are symmetrically arranged with respect to the cross-shaped gap 5, the floor gap 7 is provided on the floor 1 and is located right below the cross-shaped gap 5, the top of the metal frame 3 is provided with an upper metal sheet 8, the upper metal sheet 8 is perpendicular to the side of the metal frame 3, the longitudinal gap of the cross-shaped gap 5 is relatively provided with two metal sheets 9, the spacing width of the two metal sheets 9 is 1mm, the metal sheets 9 are perpendicular to the cross-shaped gap 5, the L-shaped gap 6 is composed of a long gap and a short gap vertically, the long gap is 10mm, the long gap is located below the transverse gap of the cross-shaped gap 5, the short gap is 4mm, the short gap is located on one side of the cross-shaped gap 5, the transverse length of the cross-shaped gap 5 is 19mm, the longitudinal gap of the cross-shaped gap 5 is 7mm, the floor gap is 28mm, the cross-shaped gap 5 and the feeder unit includes a microstrip line 10mm, and the feeder unit is provided at the bottom of the feeder unit 10mm, and the feeder line unit of the feeder line. The length of the gap formed by the cross-shaped gap 5, the L-shaped gap 6 and the floor gap 7 is three-quarter wavelength under 3.5GHz, so that the symmetrical mode of the original closed antenna is broken, asymmetrical current distribution is formed, isolation between ports is improved, and the length of the floor gap 7 is close to the quarter wavelength of 3.5GHz, so that certain isolation between the two ports is ensured; and feeding by using a 50 omega microstrip feeder unit 10 at a position 2mm away from two ends of a floor gap 7, wherein the port impedance is 50 ohms, the microstrip line width is the width corresponding to the characteristic impedance of 50 ohms, in the physical manufacture, a high-frequency signal is introduced by adopting an SMA connector, one end of the 50 omega microstrip feeder unit 10 is connected with an inner core (namely the SMA inner core) of a coaxial line, the inner core still needs to penetrate through the dielectric substrate 2, an outer skin (namely the SMA ground) of the coaxial line is connected with the system floor 1 on the back, and the occupied area of the whole two port antenna pair is 28mm 7mm 2.5mm.
Fig. 5 is a schematic diagram of surface currents when the antenna feeds the left port, and it can be obtained from the diagram that a current zero point appears at the place marked in the diagram, and the left port is an anti-node point of the currents on the ground, and the right port is a node point of the currents, that is, the currents are the maximum points of the currents when starting from the left port and reach the minimum points of the currents at the right port through nearly a quarter wavelength. The current on the frame passes through a quarter wavelength from the left port to the current zero point, then reversely starts from the current zero point, passes through a half wavelength when reaching the right port, and is just a current wave node. Both current paths reach the current wave node at the right port, so that this model achieves a higher degree of isolation. In general, the current symmetry mode of the original closed gap is broken through, and the current mode is changed into asymmetry by adding other paths, so that the isolation is improved.
FIG. 6 is a schematic diagram of S parameters of the MIMO array, and the reflection coefficients S11 are all lower than-6 dB in the working frequency band of 3.3-3.6 GHz. The two unit antennas of the unit antenna pair 4 have the isolation degree of minus 30dB at the lowest and minus 17dB at the highest on the resonance frequency. The isolation between any two unit antenna pairs 4 is lower than-16.3 dB in the working frequency band of 3.3-3.6.
Fig. 7 shows MIMO array element antenna patterns, which show that the direction is nearly omnidirectional and the terminal can receive signals from all directions well.
Fig. 8 is a schematic diagram of the antenna efficiency of the MIMO array unit, which can be seen from the figure that the antenna efficiency of the unit fluctuates between 74% and 93% in the operating frequency band, and the efficiency of each unit is greater than 74%.
Fig. 9 is a schematic diagram of envelope correlation coefficients between elements of a MIMO antenna, and it can be seen from the diagram that the envelope correlation coefficients are lower than 0.02 in the entire operating band. Analysis shows that the MIMO array units designed by the invention have little mutual influence, and each unit can work independently.
In the description of the present invention, it is to be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "one side", "top", "inner", "front", "center", "two ends", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention; and those skilled in the art will appreciate that the benefits to be achieved by the present invention are only better than those achieved by current embodiments of the prior art under certain circumstances, rather than the best use directly in the industry.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a sharing is from keeping apart MIMO antenna, its characterized in that, includes floor (1), dielectric substrate (2), metal frame (3) and eight unit antenna, dielectric substrate (2) set up the top on floor (1), floor (1) through metal frame (3) with dielectric substrate (2) connect into the cuboid shape, eight unit antenna two liang become four group unit antenna pairs (4) of a set of sharing radiata formation, the long frame both sides of metal frame (3) all are provided with two sets ofly unit antenna pair (4), four groups no decoupling zero component has been added between the arbitrary both ends mouth of unit antenna pair (4), unit antenna pair (4) both ends mouth sharing radiata body.
2. The shared self-isolation MIMO antenna according to claim 1, wherein the radiator comprises a cross-shaped gap (5), a floor gap (7) and two L-shaped gaps (6), the cross-shaped gap (5) and the two L-shaped gaps (6) are formed in the metal frame (3), the two L-shaped gaps (6) are symmetrically arranged relative to the cross-shaped gap (5), the floor gap (7) is formed in the floor (1) and is located under the cross-shaped gap (5), an upper metal sheet (8) is arranged at the top of the metal frame (3), the upper metal sheet (8) is perpendicular to the side of the metal frame (3), two metal sheets (9) are oppositely arranged at the longitudinal gap of the cross-shaped gap (5), and the metal sheets (9) are perpendicular to the cross-shaped gap (5).
3. A shared self-isolating MIMO antenna according to claim 2, characterized in that the L-shaped slot (6) is vertically composed of a long slot 10mm long and a short slot 4mm long, the long slot being located below the lateral slot of the cross-shaped slot (5), the short slot being located at one side of the cross-shaped slot (5).
4. A shared self-isolating MIMO antenna according to claim 3, characterised in that the cross-shaped slot (5) has a transverse slot length of 19mm and the cross-shaped slot (5) has a longitudinal slot length of 7mm.
5. A shared self-isolating MIMO antenna according to claim 4, wherein the floor gap (7) is 28mm long.
6. A shared self-isolating MIMO antenna according to claim 5, wherein the cross-shaped slot (5), the floor slot (7) and the L-shaped slot (6) are all 2mm wide.
7. The shared self-isolating MIMO antenna of claim 1, wherein the floor (1) has a rectangular shape with a length of 150mm and a width of 75mm, and the floor (1) is made of metal.
8. A shared self-isolating MIMO antenna according to claim 7, wherein the dielectric substrate (2) is made of FR-4 material (ε)r=4.4, tan δ = 0.02), the dielectric substrate (2) has a thickness of 0.8mm, and the dielectric substrate (2) has the same shape and size as the floor panel (1).
9. A shared self-isolating MIMO antenna according to claim 8, characterised in that the height of the metal rim (3) is 7mm.
10. A shared self-isolating MIMO antenna according to claim 2, wherein the pair of element antennas (4) comprises a feeder element (10), the feeder element (10) is disposed at the bottom of the metal frame (3), and the feeder element (10) is fed by a microstrip line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210843781.5A CN115275599A (en) | 2022-07-18 | 2022-07-18 | Shared self-isolation MIMO antenna |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210843781.5A CN115275599A (en) | 2022-07-18 | 2022-07-18 | Shared self-isolation MIMO antenna |
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| Publication Number | Publication Date |
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| CN115275599A true CN115275599A (en) | 2022-11-01 |
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| CN202210843781.5A Pending CN115275599A (en) | 2022-07-18 | 2022-07-18 | Shared self-isolation MIMO antenna |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201025726A (en) * | 2008-12-30 | 2010-07-01 | Arcadyan Technology Corp | Dual-band printed monopole antenna |
| CN110061349A (en) * | 2019-05-08 | 2019-07-26 | 清华大学 | A kind of broadband 5G MIMO antenna for mobile phone based on orthogonal modes pair |
| CN209626433U (en) * | 2019-03-13 | 2019-11-12 | 深圳市信维通信股份有限公司 | A kind of 5G mimo antenna |
| WO2022105828A1 (en) * | 2020-11-23 | 2022-05-27 | 维沃移动通信有限公司 | Antenna and electronic device |
-
2022
- 2022-07-18 CN CN202210843781.5A patent/CN115275599A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201025726A (en) * | 2008-12-30 | 2010-07-01 | Arcadyan Technology Corp | Dual-band printed monopole antenna |
| CN209626433U (en) * | 2019-03-13 | 2019-11-12 | 深圳市信维通信股份有限公司 | A kind of 5G mimo antenna |
| CN110061349A (en) * | 2019-05-08 | 2019-07-26 | 清华大学 | A kind of broadband 5G MIMO antenna for mobile phone based on orthogonal modes pair |
| WO2022105828A1 (en) * | 2020-11-23 | 2022-05-27 | 维沃移动通信有限公司 | Antenna and electronic device |
Non-Patent Citations (1)
| Title |
|---|
| 张锦等: "应用于金属边框的紧凑共辐射MIMO手机天线设计", 《2021年全国微波毫米波会议论文集》, 23 May 2023 (2023-05-23), pages 865 - 867 * |
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