CN113013621B - Compact high-isolation MIMO antenna for 5G mobile terminal - Google Patents
Compact high-isolation MIMO antenna for 5G mobile terminal Download PDFInfo
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- CN113013621B CN113013621B CN202110223277.0A CN202110223277A CN113013621B CN 113013621 B CN113013621 B CN 113013621B CN 202110223277 A CN202110223277 A CN 202110223277A CN 113013621 B CN113013621 B CN 113013621B
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- 238000002955 isolation Methods 0.000 title claims abstract description 17
- 230000005855 radiation Effects 0.000 claims abstract description 34
- 230000005404 monopole Effects 0.000 claims abstract description 22
- 239000000758 substrate Substances 0.000 claims abstract description 22
- 230000008878 coupling Effects 0.000 claims abstract description 13
- 238000010168 coupling process Methods 0.000 claims abstract description 13
- 238000005859 coupling reaction Methods 0.000 claims abstract description 13
- 239000002184 metal Substances 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims description 2
- 238000004891 communication Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010295 mobile communication Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
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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
- 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
- H01Q1/48—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
- 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
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
-
- 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
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- Variable-Direction Aerials And Aerial Arrays (AREA)
- Details Of Aerials (AREA)
Abstract
The invention discloses a high-isolation MIMO antenna facing a 5G mobile terminal, which comprises a rectangular substrate and a metal bottom plate, wherein the substrate is provided with a three-unit antenna module, and the three-unit antenna module comprises a first dipole antenna unit, a second dipole antenna unit and a monopole antenna unit, wherein the radiation surface of the first dipole antenna unit is vertical to the substrate; two right-angle sides of a vertex angle of the substrate are respectively positioned on the radiation surfaces of the first dipole antenna unit and the second dipole antenna unit, and the radiation surface of the monopole antenna unit is parallel to the radiation surface of the first dipole antenna unit or the radiation surface of the second dipole antenna unit and is vertical to the radiation surface of the other dipole antenna unit. The antenna has the advantages of high isolation, capability of effectively reducing mutual coupling between the antennas in a compact space, improvement of space utilization rate, compact structure, contribution to reduction of the size of the antennas and capability of covering a frequency band required by 5G communication.
Description
Technical Field
The invention relates to an antenna technology, in particular to a compact high-isolation MIMO antenna facing a 5G mobile terminal.
Background
In recent years, with the rapid development of wireless communication and the increasing capacity of communication systems, electromagnetic wave propagation environments have become more and more complex, and the quality of life of people has been more and more requested for wireless mobile communication systems and mobile phones. Unlike conventional communication systems, in MIMO systems including spatial diversity and spatial multiplexing, multipath effects have become favorable, and can be used to improve the information transmission rate and also to ensure the reliability of information transmission by using spatial diversity techniques.
The fifth generation (5G) mobile communication system will be deployed in large scale in 2020, and compared with the current 4G system, the 5G mobile communication system has many advantages such as higher transmission rate and shorter delay. Theoretically, the capacity of the MIMO channel increases linearly with the number of MIMO elements, however, for a mobile terminal, more and more peripheral devices are provided, the design space of the antenna is smaller and smaller, the size of the whole terminal is limited, the coupling between the antennas is strengthened, the radiation efficiency of the elements in the MIMO is further reduced, and the advantages of the MIMO antenna technology cannot be achieved. How to realize high isolation and low Envelope Correlation Coefficient (ECC) among antennas in a limited space and ensure the performance of the antennas is a difficulty of designing the MIMO antennas. The decoupling can improve the utilization rate of space and guarantee the normal work of MIMO antenna, and the traditional decoupling method is to introduce an external decoupling structure into the antenna, which occupies large space and has low utilization rate of space, and the decoupling structure can bring channel coupling, change the original characteristics of the antenna and can not meet the requirements of 5G mobile terminals.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a 5G terminal-oriented MIMO antenna with high isolation and compact structure.
The technical scheme is as follows: the high-isolation MIMO antenna facing the 5G mobile terminal comprises a rectangular substrate and a metal bottom plate; the three-unit antenna module is arranged on the substrate and comprises a first dipole antenna unit, a second dipole antenna unit and a monopole antenna unit, wherein the radiation surface of the first dipole antenna unit is vertical to the substrate; two right-angle sides of a vertex angle of the substrate are respectively positioned on the radiation surfaces of the first dipole antenna unit and the second dipole antenna unit, and the radiation surface of the monopole antenna unit is parallel to the radiation surface of the first dipole antenna unit or the radiation surface of the second dipole antenna unit and is vertical to the radiation surface of the other dipole antenna unit.
The base plate is made of FR-4 grade materials, the relative dielectric constant is 4.4, the loss tangent value is 0.02, the base plate is provided with a vertical section for printing antenna units, the first dipole antenna unit, the second dipole antenna unit and the monopole antenna unit are printed on the vertical section, the first dipole antenna unit and the second dipole antenna unit are of inverted U-shaped structures, the first dipole antenna unit and the second dipole antenna unit share one coupling grounding branch through coupling microstrip lines, the coupling microstrip lines are determined according to antenna impedance matching requirements, the monopole antenna unit is of a T-shaped structure, the microstrip lines are used for direct feeding, impedance is matched through the grounding branch, metal through holes are processed at two tail ends of the grounding branch, the antenna is grounded through the metal through holes, and grooves for preventing current coupling of the antenna units are corroded in the metal base plate.
Furthermore, each top corner of the substrate is provided with a three-unit antenna module.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: the isolation between the antennas is high, the envelope correlation is low, the mutual coupling between the antennas can be effectively reduced in a compact space, the space utilization rate is improved, the structure is compact, the size of the antennas is favorably reduced, and the frequency band required by 5G communication can be covered.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a block diagram of a first dipole antenna element in one embodiment of the invention;
fig. 3 is a block diagram of a second dipole antenna element in one embodiment of the invention;
fig. 4 is a block diagram of a monopole antenna element in one embodiment of the invention;
FIG. 5 is a current distribution diagram for a first dipole antenna when excited in accordance with an embodiment of the present invention;
FIG. 6 is a current distribution diagram for a second dipole antenna when excited in accordance with an embodiment of the present invention;
fig. 7 is a current profile for a monopole antenna when energized in accordance with an embodiment of the present invention;
fig. 8 is a radiation pattern of a first dipole antenna element in an embodiment of the invention;
fig. 9 is a radiation pattern of a second dipole antenna element in accordance with an embodiment of the present invention;
fig. 10 is a radiation pattern of a monopole antenna element in one embodiment of the invention;
fig. 11 is an S-parameter curve for a MIMO antenna in an embodiment of the present invention;
fig. 12 is a graph of envelope correlation coefficients for MIMO antennas in an embodiment of the invention;
fig. 13 is a twelve-element extended model of a MIMO antenna in an embodiment of the invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
The high-isolation MIMO antenna facing a 5G mobile terminal in the embodiment shown in fig. 1 includes a first dipole antenna unit 1, a second dipole antenna unit 2, a monopole antenna unit 3, a substrate 4 and a metal floor, wherein radiation modes of the antenna units are orthogonal to each other, and radiation surfaces are perpendicular to the substrate. The first dipole antenna unit and the second dipole antenna unit are arranged along two right-angle sides of a vertex angle of the substrate respectively, the monopole antenna unit is placed in an included angle between the first dipole antenna unit and the second dipole antenna unit, a radiation surface of the monopole antenna unit is parallel to the first dipole antenna unit and perpendicular to a radiation surface of the second dipole antenna, a vertical section is arranged on the substrate, the antenna units are printed on the vertical section, and grooves used for preventing current coupling of the antenna units are corroded in the metal bottom plate.
As shown in fig. 2-4, the first dipole antenna unit and the second dipole antenna unit are both of an inverted U-shaped structure, the feed ports of the feed ports are 1a and 2a, respectively, and are coupled and fed through microstrip lines 1b and 2b, and the two antenna units have dimensions of 15mm × 5.2mm and 14.4mm × 5.2mm, respectively; the monopole antenna unit 3 is a T-shaped monopole antenna, and is directly fed through a connecting port 3a of a microstrip line 3b brushed on the system substrate 4, and is matched with the antenna impedance through a grounding branch 3c, and metal through holes for grounding are arranged at the positions 3d and 3e of the 3 c.
The central operating frequency of this embodiment is selected to be 3.5GHz, the operating bandwidth is 3400-. When the first dipole antenna element is excited, the current on the U-shaped radiating element flows from right to left in the direction of the arrow in the figure, the phase of the two branch currents in the z-axis direction is different by 180 °, so that the current of the antenna 1 in the z-axis direction is in equal amplitude and opposite phase, and therefore the electromagnetic fields generated by the current in the z-axis direction can cancel each other out, so that the radiation pattern of the antenna 1 is mainly determined by the current distributed in the x-axis direction; as shown in fig. 6, the second dipole antenna element has a similar current distribution when excited as the first dipole antenna element, and its radiation pattern is mainly determined by the current in the y-axis direction; as shown in fig. 7, when the monopole antenna element 3 is excited, the currents on the horizontal branches along the x-axis are equal in magnitude and 180 degrees out of phase, so that the radiated energy can cancel each other out, and the current distributed along the z-axis determines the radiation pattern of the monopole antenna element.
As shown in fig. 8 to 10, the radiation pattern of the first dipole antenna element 1 is a radiation null (null) in the x-axis direction, and a maximum value is obtained on the yoz plane; the radiation pattern of the second dipole antenna element 2 is a radiation null (null) in the y-axis direction, and has a maximum value at the xoz plane; the radiation pattern of the monopole antenna unit 3 is a radiation zero point (null) in the z-axis direction, and a maximum value is obtained on an xoy plane; therefore, the radiation modes of the three antennas are orthogonal, and theoretically, the isolation between the antenna units can reach infinity, so that decoupling between the antennas is realized.
As shown in fig. 11, the three-port reflection coefficient of the MIMO antenna of this embodiment is smaller than-6 dB, the bandwidth is well covered by 3400 and 3600MHz, and the isolation between any two ports is above 16dB, which indicates that the three antenna units achieve better decoupling, and as shown in fig. 12, the ECC of the MIMO antenna of this embodiment is smaller than 0.05, which indicates that the three antenna units have good independence.
As shown in fig. 13, the MIMO antenna of the present invention may further include a three-element antenna module disposed at each of the four top corners of the substrate, so as to be extended to a twelve-element antenna.
Claims (5)
1. A compact high-isolation MIMO antenna facing a 5G mobile terminal comprises a rectangular substrate and a metal bottom plate, and is characterized in that three antenna units are arranged on the substrate, and each three antenna unit comprises a first dipole antenna unit (1), a second dipole antenna unit (2) and a monopole antenna unit (3); the first dipole antenna unit (1) and the second dipole antenna unit (2) are respectively arranged along two right-angle sides of a vertex angle of the substrate, and the monopole antenna unit (3) is positioned in an included angle between the first dipole antenna unit (1) and the second dipole antenna unit (2);
two right-angle sides of one vertex angle of the substrate are respectively positioned on the radiation surfaces of the first dipole antenna unit and the second dipole antenna unit, and the radiation surface of the monopole antenna unit is vertical to the radiation surface of the first dipole antenna unit (1) and the radiation surface of the second dipole antenna unit (2); the first dipole antenna unit (1) and the second dipole antenna unit (2) are of inverted U-shaped structures, feed through a coupling microstrip line, the first dipole antenna unit and the second dipole antenna unit share a coupling grounding branch, and the position of the coupling microstrip line is determined according to the antenna impedance matching requirement; the monopole antenna unit (3) is of a T-shaped structure, the feed is directly carried out through a microstrip line, the impedance is matched through the grounding branch, metal through holes are processed at two tail ends of the grounding branch, and the antenna is grounded through the metal through holes.
2. The compact high isolation MIMO antenna facing a 5G mobile terminal according to claim 1, wherein the substrate has a vertical section for printed antenna elements thereon, and the first dipole antenna element (1), the second dipole antenna element (2) and the monopole antenna element (3) are printed on the vertical section.
3. The compact high-isolation MIMO antenna for a 5G mobile terminal according to claim 1, wherein a groove for preventing galvanic coupling of the antenna elements is etched on the metal base plate.
4. The compact high-isolation MIMO antenna for a 5G mobile terminal according to claim 1, wherein one three-element antenna module is disposed at each vertex of the substrate.
5. The compact high-isolation MIMO antenna for a 5G mobile terminal according to claim 1, wherein the substrate is made of an FR-4 grade material, has a relative dielectric constant of 4.4, and has a loss tangent of 0.02.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110223277.0A CN113013621B (en) | 2021-03-01 | 2021-03-01 | Compact high-isolation MIMO antenna for 5G mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110223277.0A CN113013621B (en) | 2021-03-01 | 2021-03-01 | Compact high-isolation MIMO antenna for 5G mobile terminal |
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| CN113013621A CN113013621A (en) | 2021-06-22 |
| CN113013621B true CN113013621B (en) | 2022-08-05 |
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| CN202110223277.0A Active CN113013621B (en) | 2021-03-01 | 2021-03-01 | Compact high-isolation MIMO antenna for 5G mobile terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114267947A (en) * | 2021-12-23 | 2022-04-01 | 杭州湃腾科技有限公司 | Twelve-port high-isolation MIMO antenna for mobile terminal |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110289480A (en) * | 2019-07-12 | 2019-09-27 | 南京信息工程大学 | A kind of beam scanning array antenna of dipoles applied to smartwatch |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010004470B4 (en) * | 2010-01-13 | 2013-05-08 | Continental Automotive Gmbh | Antenna structure for a vehicle |
| KR20150081179A (en) * | 2014-01-03 | 2015-07-13 | 한국전자통신연구원 | Multi-channel mimo antenna apparatus using monopole or dipole antenna |
| US9537210B2 (en) * | 2015-03-25 | 2017-01-03 | Intel IP Corporation | Antenna card for controlling and tuning antenna isolation to support carrier aggregation |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110289480A (en) * | 2019-07-12 | 2019-09-27 | 南京信息工程大学 | A kind of beam scanning array antenna of dipoles applied to smartwatch |
Non-Patent Citations (2)
| Title |
|---|
| Compact 5G MIMO Mobile Phone Antennas With Tightly Arranged Orthogonal-Mode Pairs;Libin Sun等;《IEEE Transactions on Antennas and Propagation》;20180810;第66卷(第11期);对比文件1第6364页右栏最后1段至第6365页左栏以及图1 * |
| 面向移动终端的LTE与5G MIMO多天线系统的协同设计(特邀报告);杨广立等;《2019年全国天线年会》;20190722;全文 * |
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