CN115332787A - Four-port high-isolation MIMO antenna - Google Patents
Four-port high-isolation MIMO antenna Download PDFInfo
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- CN115332787A CN115332787A CN202210958842.2A CN202210958842A CN115332787A CN 115332787 A CN115332787 A CN 115332787A CN 202210958842 A CN202210958842 A CN 202210958842A CN 115332787 A CN115332787 A CN 115332787A
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- 238000002955 isolation Methods 0.000 title claims abstract description 31
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- 230000002146 bilateral effect Effects 0.000 claims description 2
- 230000005855 radiation Effects 0.000 abstract description 11
- 230000002950 deficient Effects 0.000 abstract 1
- 230000008878 coupling Effects 0.000 description 7
- 238000010168 coupling process Methods 0.000 description 7
- 238000005859 coupling reaction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
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- 238000004891 communication Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 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
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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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
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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
- H01Q21/00—Antenna arrays or systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a four-port high-isolation MIMO antenna, and belongs to the field of antennas. The antenna comprises a rectangular dielectric substrate, four microstrip feeder lines arranged on the front surface of the dielectric substrate and a ground plate arranged on the back surface of the dielectric substrate; the grounding plate is provided with a polygonal gap, two T-shaped gaps and four convex gaps. The antenna is fed by the four microstrip feed lines, electromagnetic waves are radiated out through the convex-shaped gaps, and the T-shaped gaps on the grounding plate enable microstrip line currents distributed up and down to be offset, so that high isolation among the up-and-down symmetrical unit antennas is realized; meanwhile, polygonal gaps are introduced to change the distribution of current on the defective floor, and the equivalent distance between ports is increased, so that the isolation of the antenna is greatly improved. The antenna has the advantages of wide frequency band, low cost, miniaturization, high isolation, wide radiation range and the like.
Description
Technical Field
The invention belongs to the field of antennas, and particularly relates to a four-port high-isolation MIMO antenna.
Background
The MIMO antenna has the advantages of high signal transmission rate, high spectrum utilization rate, high space efficiency, low power consumption and the like, plays a key promoting role in the development of 5G and has very high practical value. Since the MIMO system was proposed by bell laboratories, the research of MIMO antennas has received wide attention both at home and abroad. Currently, MIMO antennas are developing towards miniaturization, ultra-wideband, high isolation. In general, in order to meet the requirement for miniaturization of MIMO antennas, coupling between antennas increases as the distance between element antennas decreases, and performance of a MIMO antenna system deteriorates accordingly, and therefore, it is of practical significance to develop wireless communication by increasing coupling between MIMO antenna elements.
At present, the methods for decoupling MIMO antennas in domestic and foreign papers can be roughly classified into three methods. One method for decoupling the MIMO antenna is to change the antenna surface current distribution through a metamaterial or EBG structure. Generally, the metamaterial has a negative dielectric constant or magnetic permeability, and has a remarkable advantage in inhibiting the coupling of surface waves. EBG changes the current distribution through a periodic planar structure. Another method for improving the isolation of the antenna is to use an antenna with a complementary structure, and since the antenna has a high isolation characteristic, the antenna can achieve high isolation without any decoupling structure. The third type of decoupling structure is loading a parasitic patch or slotting on the ground or loading an inductive or capacitive split-ring resonator above the patch. For example, the Two-port ultra-wideband MIMO Antenna mentioned in "Isolation Enhancement of a Very Compact UWB-MIMO Slot Antenna With Two fed groups Structures" in IEEE Antennas and Wireless processing characteristics Letters 2015, volume 14 improves the Isolation between Two ports by means of Ground slotting; but the transmission rate of the antenna needs to be further improved to meet the requirement of the 5G technology.
Disclosure of Invention
The invention provides a four-port high-isolation MIMO antenna, which is characterized in that in order to improve the data transmission rate of the antenna, a two-port MIMO antenna is firstly expanded into a four-port antenna, and then the isolation of the antenna is improved by adopting a defected ground decoupling mode under the condition of not increasing the space between unit antennas. The antenna has the advantages of wide frequency band, low cost, miniaturization, high isolation, wide radiation range and the like.
The technical scheme adopted by the invention is as follows:
a four-port high-isolation MIMO antenna is characterized in that the antenna is of a bilateral symmetry structure and an up-down symmetry structure, and comprises a rectangular dielectric substrate, four microstrip feeder lines arranged on the front surface of the dielectric substrate and a ground plate arranged on the back surface of the dielectric substrate;
the microstrip feeder line is a rectangular microstrip line, the long side of the microstrip feeder line is parallel to the long side of the dielectric substrate, and one short side of the microstrip feeder line is superposed with the short side of the dielectric substrate and serves as a feed port;
the grounding plate is provided with a polygonal gap, two T-shaped gaps and four convex gaps;
the polygonal gap is arranged in the middle of the grounding plate and divides the grounding plate into a left part and a right part;
the longitudinal rectangular gap of the T-shaped gap is parallel to the short side of the medium substrate, the central line of the transverse rectangular gap is superposed with the central line of the short side of the medium substrate, and one end of the transverse rectangular gap is superposed with the short side of the medium substrate;
the two convex gaps are arranged in the forward direction and inverted; the convex-shaped gap consists of a bottom rectangular part and a convex rectangular part; one side of the bottom rectangular part is superposed with the long side of the dielectric substrate, and the long side of the protruding rectangular part is parallel to the short side of the dielectric substrate.
Further, the width of the middle part of the polygonal gap is larger than the width of the two sides.
Furthermore, the polygonal gap is a dodecagonal gap and consists of a first rectangle, two isosceles trapezoids and two second rectangles, wherein the middle part of the first rectangle is the first rectangle, two short sides of the first rectangle are respectively connected with the lower bottom of one isosceles trapezoid, and the upper bottom of the isosceles trapezoid is connected with the second rectangle.
Furthermore, the grounding plate is also provided with two linear gaps, and the long sides of the linear gaps are parallel to the short sides of the dielectric substrate.
Further, the distance S between the two microstrip feeder lines positioned on the left side/the right side is 7.6mm, the length T2 of the longitudinal branch of the T-shaped slot is 8mm, and the length T1 of the transverse branch is 7.5mm; the central line of the two convex-shaped gaps positioned on the left side/the right side is positioned at the long side of the dielectric substrate by 0.25Ws, and the total height of the bottom rectangular part and the convex rectangular part is 10.2mm.
Furthermore, the distance lengths of the straight-line-shaped slot, the microstrip feeder line and the longitudinal center line of the antenna are equal.
The invention feeds the antenna by four microstrip feed lines, electromagnetic waves are radiated out through the convex-shaped gaps, the T-shaped gaps on the grounding plate enable microstrip line currents distributed up and down on the left side/the right side to be offset, high isolation among the antennas of the up-and-down symmetrical units is realized, but the coupling degree among the left side/the right side ports is high due to continuous current distribution on the defect floor and electromagnetic wave coupling among the ports, so that the polygonal gaps are introduced to change the current distribution on the defect floor, the polygonal gaps can equivalently increase the equivalent distance among the ports, and the isolation degree of the antenna is greatly improved. Compared with the prior art, the invention has the advantages that:
(1) The antenna has a large number of unit antennas while having a small size, thereby improving the data transmission rate.
(2) The reasonable defected ground structure is adopted to ensure that the space between the unit antennas is not changed and the coupling degree between the unit antennas is reduced.
(3) The relative bandwidth of the antenna can reach 97.3% while high isolation is met.
Drawings
FIG. 1 is a 3D perspective view of an embodiment of the present invention;
FIG. 2 is a top view and a bottom view of an embodiment of the present invention, wherein (a) is a top view and (b) is a bottom view;
FIG. 3 is a schematic structural diagram of a polygonal slot in a defect ground according to an embodiment of the present invention;
FIG. 4 is a S parameter graph according to an embodiment of the present invention;
fig. 5 is a far-field direction radiation E-plane and H-plane diagrams of three different frequency points of the antenna according to the embodiment of the present invention, wherein (a) is an E-plane radiation pattern, and (b) is an H-plane radiation pattern;
FIG. 6 is a graph of gain and antenna radiation efficiency for an embodiment of the present invention;
fig. 7 is a graph of envelope correlation coefficients according to an embodiment of the present invention.
Reference numerals: 1 microstrip line, 2 dielectric substrates, 3 ground plates, 4T-shaped gaps, 5 convex-shaped gaps, 6 polygonal gaps and 7 linear gaps.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following embodiments are merely used to more clearly illustrate the technical solutions of the present invention, and therefore, the following embodiments are merely used as examples, and cannot limit the keep-alive range of the present invention.
It is to be noted that unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
As shown in fig. 1, in the embodiment of the present invention, a rectangular dielectric substrate 2 is adopted, the dielectric constant of which is 4.4, and the thickness of which is 0.8mm, four microstrip feed lines 1 are arranged on the upper layer of the dielectric substrate, and the four microstrip feed lines are respectively symmetrical up and down and left and right with respect to the central line of the long side and the central line of the short side of the dielectric substrate. The lower layer of the dielectric substrate is a ground plate 3, the antenna generates a voltage difference to feed by the microstrip feeder 1 and the ground plate 3, and an SMA interface is usually adopted.
Fig. 2 shows the top and bottom views of the embodiment of the present invention, two T-shaped slots 4, four raised slots 5, two in-line slots 7 and polygonal slots 6 are disposed on the ground plate. The two T-shaped gaps are symmetrical about the central line of the long side of the dielectric substrate, the four convex-shaped gaps are symmetrical about the central lines of the long side and the short side of the dielectric substrate respectively, and the straight-shaped gaps are symmetrical about the central line of the long side of the dielectric substrate.
With reference to fig. 1 and 2, in the embodiment of the present invention, the antenna is fed by the microstrip feed line, electromagnetic waves are radiated out through the zigzag slot, and the T-shaped slot on the ground plane cancels out the currents of the microstrip feed lines distributed up and down on the left side/right side, thereby achieving high isolation between the antennas of the upper line symmetric unit.
Fig. 3 is a polygonal slot of the midline of the long sides of the grounding plate.
In order to further verify the performance of the antenna structure, simulation is performed according to the specific parameter settings shown in table one, and simulation effect graphs are shown in fig. 4-7.
Table 1 antenna size simulation data
| A1 | A2 | B1 | C1 | C2 | D1 | D2 | L |
| 3.2mm | 7mm | 5mm | 4mm | 5mm | 0.5mm | 9mm | 15mm |
| L1 | Ls | T1 | T2 | T3 | W | Ws | W1 |
| 12mm | 26mm | 7.5mm | 8mm | 2mm | 2mm | 44mm | 0.1mm |
| W2 | W3 | W4 | S | ||||
| 2mm | 2mm | 2mm | 7.6mm |
With reference to the parameter positions marked in fig. 1, 2, and 3, it can be seen that A1 and B1 represent the width and length of the rectangular portion at the bottom of the slot in the shape of a Chinese character 'tu', A2 and W4 represent the length and width of the rectangular portion protruding above the slot in the shape of a Chinese character 'tu', C1 and D1 represent the length and width of the second rectangle in the polygonal slot, D2 represents the height of the isosceles trapezoid in the polygonal slot, C2 represents the width of the first rectangle in the polygonal slot, L, W represents the length and width of the microstrip feed line, and W1 and L1 represent the width and length of the slot in the shape of a Chinese character 'yi'. T1 and W3 represent the length and width of a transverse rectangular slot in the T-shaped slot, T2 and W2 represent the length and width of a longitudinal rectangular slot in the T-shaped slot, and Ws and Ls represent the length and width of the dielectric substrate.
FIG. 4 shows the simulation results of the S parameters of the present invention, which range from 3.8-11dB, S11< -10dB, and almost less than-20dB for S21, and less than-14 dB for S41 in the operating bandwidth, and can reach the standard of engineering application.
Fig. 5 shows the radiation patterns of the antenna at 6 GHz, 8 GHz and 10GHz, and it can be seen that the antenna can achieve radiation coverage in a wide range when operating.
Fig. 6 is a gain diagram and a radiation efficiency diagram of the antenna, and it can be known from the diagrams that the antenna gain is greater than 2dB and the radiation efficiency is greater than 80% in the working frequency band of 3.8-11 GHz.
Fig. 7 is a diagram of antenna envelope correlation coefficients, where the envelope coefficients are usually an important parameter for measuring the coupling degree between antenna ports, and usually, an ECC less than 0.5 indicates that the antenna has practical application value in engineering, and fig. 7 indicates that the antenna ports of the present invention are all less than 0.15 in the operating bandwidth, so that the isolation between the ports is high.
In conclusion, the four-port high-isolation MIMO antenna provided by the invention adopts a defected ground mode for decoupling, so that a high-isolation effect is achieved. The antenna has the characteristics of small size, high isolation, ultra wide band, wide radiation area and the like, and can be applied to indoor mobile equipment.
Claims (6)
1. A four-port high-isolation MIMO antenna is characterized in that the antenna is of a bilateral symmetry structure and an up-down symmetry structure, and comprises a rectangular dielectric substrate, four microstrip feeder lines arranged on the front surface of the dielectric substrate and a ground plate arranged on the back surface of the dielectric substrate;
the microstrip feeder line is a rectangular microstrip line, the long side of the microstrip feeder line is parallel to the long side of the dielectric substrate, and one short side of the microstrip feeder line is superposed with the short side of the dielectric substrate and serves as a feed port;
the grounding plate is provided with a polygonal gap, two T-shaped gaps and four convex gaps;
the polygonal gap is arranged in the middle of the grounding plate and divides the grounding plate into a left part and a right part;
the longitudinal rectangular gap of the T-shaped gap is parallel to the short side of the medium substrate, the central line of the transverse rectangular gap is superposed with the central line of the short side of the medium substrate, and one end of the transverse rectangular gap is superposed with the short side of the medium substrate;
the two convex gaps are arranged in the forward direction and inverted; the convex-shaped gap consists of a bottom rectangular part and a convex rectangular part; one side of the bottom rectangular part is superposed with the long side of the dielectric substrate, and the long side of the protruding rectangular part is parallel to the short side of the dielectric substrate.
2. The four-port high isolation MIMO antenna of claim 1, wherein the width of the polygonal slot is greater in the middle than on both sides.
3. The four-port high-isolation MIMO antenna as claimed in claim 2, wherein the polygonal slot is a dodecagonal slot and is composed of a first rectangle, two isosceles trapezoids and two second rectangles, wherein the middle part of the dodecagonal slot is the first rectangle, two short sides of the first rectangle are respectively connected with a lower base of the isosceles trapezoid, and an upper base of the isosceles trapezoid is connected with the second rectangle.
4. The four-port high-isolation MIMO antenna as claimed in claim 3, wherein the ground plate is further provided with two in-line slots, and the long side of the in-line slot is parallel to the short side of the dielectric substrate.
5. The four-port high isolation MIMO antenna of claim 4, wherein the slot, microstrip feed and antenna longitudinal centerline are spaced apart by the same distance.
6. The four-port high-isolation MIMO antenna as claimed in claim 5, wherein the distance S between the two microstrip feed lines on the left/right sides is 7.6mm, the length T2 of the longitudinal branch of the T-shaped slot is 8mm, and the length T1 of the transverse branch is 7.5mm; the central line of the two convex-shaped gaps positioned on the left side/the right side is positioned at the long side of the dielectric substrate by 0.25Ws, and the total height of the bottom rectangular part and the convex rectangular part is 10.2mm.
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| CN202210958842.2A CN115332787A (en) | 2022-08-10 | 2022-08-10 | Four-port high-isolation MIMO antenna |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117394027A (en) * | 2023-12-12 | 2024-01-12 | 华南理工大学 | Dual-frequency self-isolation in-band full-duplex super-surface antenna and design method thereof |
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| CN108281788A (en) * | 2018-01-22 | 2018-07-13 | 电子科技大学 | A kind of element microstrip array antenna reducing coupling |
| WO2019183665A1 (en) * | 2018-03-26 | 2019-10-03 | Netcomm Wireless Limited | Ultra thin and compact dual polarized microstrip patch antenna array with 3-dimensional (3d) feeding network |
| JP2019208198A (en) * | 2018-05-28 | 2019-12-05 | 京セラ株式会社 | Antenna and communication device |
| CN211578970U (en) * | 2020-03-31 | 2020-09-25 | 合肥师范学院 | High-isolation microstrip quaternary MIMO antenna array |
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- 2022-08-10 CN CN202210958842.2A patent/CN115332787A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108281788A (en) * | 2018-01-22 | 2018-07-13 | 电子科技大学 | A kind of element microstrip array antenna reducing coupling |
| WO2019183665A1 (en) * | 2018-03-26 | 2019-10-03 | Netcomm Wireless Limited | Ultra thin and compact dual polarized microstrip patch antenna array with 3-dimensional (3d) feeding network |
| JP2019208198A (en) * | 2018-05-28 | 2019-12-05 | 京セラ株式会社 | Antenna and communication device |
| CN211578970U (en) * | 2020-03-31 | 2020-09-25 | 合肥师范学院 | High-isolation microstrip quaternary MIMO antenna array |
Non-Patent Citations (2)
| Title |
|---|
| CHAO MING LUO等: "Isolation Enhancement of a Very Compact UWB-MIMO Slot Antenna With Two Defected Ground Structures", 《IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS》, vol. 14, 23 September 2015 (2015-09-23), pages 1766 - 1769, XP011669931, DOI: 10.1109/LAWP.2015.2423318 * |
| 李倩: "适用于4G/5G通信的宽带/多带天线", 《中国博士学位论文全文数据库（电子期刊）》, 15 April 2020 (2020-04-15), pages 5 - 1 * |
Cited By (2)
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|---|---|---|---|---|
| CN117394027A (en) * | 2023-12-12 | 2024-01-12 | 华南理工大学 | Dual-frequency self-isolation in-band full-duplex super-surface antenna and design method thereof |
| CN117394027B (en) * | 2023-12-12 | 2024-03-08 | 华南理工大学 | Dual-frequency self-isolation in-band full-duplex super-surface antenna and design method thereof |
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