CN109149082B - Compact MIMO antenna and communication equipment comprising same - Google Patents
Compact MIMO antenna and communication equipment comprising same Download PDFInfo
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- CN109149082B CN109149082B CN201810787577.XA CN201810787577A CN109149082B CN 109149082 B CN109149082 B CN 109149082B CN 201810787577 A CN201810787577 A CN 201810787577A CN 109149082 B CN109149082 B CN 109149082B
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- 238000004891 communication Methods 0.000 title claims abstract description 22
- 230000005855 radiation Effects 0.000 claims abstract description 122
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 85
- 238000005452 bending Methods 0.000 claims abstract description 42
- 230000007935 neutral effect Effects 0.000 claims abstract description 11
- 150000003071 polychlorinated biphenyls Chemical class 0.000 claims description 3
- 238000002955 isolation Methods 0.000 abstract description 23
- 230000008054 signal transmission Effects 0.000 abstract description 10
- 230000005540 biological transmission Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 6
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 238000004088 simulation Methods 0.000 description 5
- 230000002146 bilateral effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 241000282326 Felis catus Species 0.000 description 1
- 241001024304 Mino Species 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 238000002360 preparation method Methods 0.000 description 1
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- 238000005549 size reduction Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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
- H01Q1/36—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
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2258—Supports; Mounting means by structural association with other equipment or articles used with computer equipment
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2291—Supports; Mounting means by structural association with other equipment or articles used in bluetooth or WI-FI devices of Wireless Local Area Networks [WLAN]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
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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
- H01Q1/273—Adaptation for carrying or wearing by persons or animals
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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
- H01Q1/52—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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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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 provides a compact MIMO antenna and communication equipment comprising the same, wherein the compact MIMO antenna comprises: a neutralization line and two antenna elements, namely a first antenna element and a second antenna element; the first antenna unit and the second antenna unit are connected through a neutralization line, and the neutralization line at least comprises an L-shaped bending part; the antenna unit comprises a trapezoid radiation body, a grounding point connected with the GND and a feed point used for transmitting signals; the long bottom edge of the trapezoid radiation body is far away from GND; the long bevel edge of the trapezoid radiation body is arranged close to the neutral line; the first end of the long base of the trapezoid radiation body is connected with the neutral line, the second end of the long base of the trapezoid radiation body extends to form a radiation tail end, and the end point of the radiation tail end is close to GND and is provided with a gap with the GND. The invention meets the requirements of small size, high isolation, simplified structure, high signal transmission performance and good anti-interference performance of the MIMO antenna.
Description
Technical Field
The present invention relates to the field of MIMO antenna technology, and in particular, to a compact MIMO antenna and a communication device including the same.
Background
With the growing demand for high-performance wireless communication, MIMO (Multiple-input Multiple-output) technology has grown and has received widespread attention. The MIMO technology utilizes a plurality of antennas to realize multiple transmission and multiple reception, greatly improves the channel capacity and the frequency spectrum utilization rate of communication equipment, and does not increase the transmitting power and the bandwidth of the antennas.
The key point of MIMO antennas is the isolation between antennas and the antenna size. Certain isolation is required between each antenna of the MIMO antenna to achieve better performance, and a larger space is generally required between the antennas to improve the isolation, so that the size of the antenna is larger and the structure is complex. For example, for a MIMO antenna operating in the 2.4G band commonly used for WIFI, the distance between each element antenna of the MIMO antenna generally needs to be 80mm or more. Therefore, how to design a MIMO antenna with a small size and a simple structure is the biggest difficulty faced by those skilled in the art.
Disclosure of Invention
The invention aims to provide a compact MIMO antenna and communication equipment comprising the same, and aims of small size, high isolation, simplified structure, high signal transmission performance and good anti-interference performance of the MIMO antenna are fulfilled.
The technical scheme provided by the invention is as follows:
the invention provides a compact MIMO antenna, comprising:
a neutralization line and two antenna elements, namely a first antenna element and a second antenna element;
the first antenna unit and the second antenna unit are connected through the neutralization line, and the neutralization line at least comprises an L-shaped bending part;
the antenna unit comprises a trapezoid radiation body, a grounding point connected with GND and a feed point used for transmitting signals;
the long bottom edge of the trapezoid radiation body is far away from the GND; the long oblique side of the trapezoid radiation body is arranged close to the neutral line; the first end of the long bottom edge of the trapezoid radiation body is connected with the neutralization line, the second end of the long bottom edge of the trapezoid radiation body extends to form a radiation tail end, and the end point of the radiation tail end is close to the GND and is provided with a gap with the GND; the first end of the long bottom edge of the trapezoid radiation body extends towards the GND along a first direction to form a first radiation arm, the tail end of the first radiation arm forms the grounding point, the short bottom edge of the trapezoid radiation body extends towards the GND to form a second radiation arm, and the tail end of the second radiation arm forms the feeding point.
In the technical scheme, the two antenna units are creatively connected through the neutralization line provided with the L-shaped bending part, so that the close-range setting of the two antenna units is realized, but the high isolation is realized, the size of the MIMO antenna is greatly reduced, meanwhile, the antenna units which are arranged close-range cannot interfere with each other due to the high isolation, and the high-efficiency transmission performance of multiple transmission and multiple reception of the MIMO antenna is ensured. More preferably, the MIMO antenna has a simple structure, each radiating element has a simple geometric figure, and the MIMO antenna is easy to process and realize. And more preferably, the radiation tail end is arranged close to the GND and forms strong coupling with the GND, so that the MIMO antenna is easy to realize resonance even though the size is small, and has good receiving and transmitting performance. More preferably, the grounding point is arranged outside the inner part and the feeding point, so that the influence of the MIMO antenna structure on the signal transmission performance of the MIMO antenna structure is effectively avoided. In summary, the MIMO antenna has the advantages of small size, high isolation, simple structure, excellent signal transmission capability, good anti-interference performance and the like, and has good practicability, practicability and market prospect.
Further, the distance between the end point of the radiation tail end and the GND is 0.5 mm-3 mm; and/or the distance between the grounding point and the feeding point is 1.5 mm-5 mm; and/or the size of the neutralization line along the second direction is lambda/27-lambda/23; wherein, the first direction is perpendicular to the second direction, λ is the working wavelength of the compact MIMO antenna, λ= (c/f), c is the speed of light, and f is the working frequency of the compact MIMO antenna; and/or the extension lengths of the radiation end of the first antenna element and the radiation end of the second antenna element are different; and/or the radiating areas of the trapezoid radiating body of the first antenna unit and the trapezoid radiating body of the second antenna unit are different.
In the technical scheme, the sizes of all the components of the MIMO antenna are further determined, so that the working transmission performance of the MIMO antenna is improved, pertinence is achieved, and the high-efficiency performance of the MIMO antenna at a certain determined frequency is ensured. More preferably, the two antenna units of the MIMO antenna can be in a bilateral symmetry structure or not, and the two antenna units can be in a bilateral symmetry structure, but the radiating areas of the radiating bodies are different, but the basic structural shapes are similar, so that the product diversity and individuation setting of the MIMO antenna can be realized.
Further, a third radiating arm is extended from the second end of the long bottom edge of the trapezoid radiating body along the reverse direction of the first direction, a fourth radiating arm is extended from the extended end of the third radiating arm along the second direction and away from the trapezoid radiating body, and a fifth radiating arm is extended from the extended end of the fourth radiating arm along the first direction; wherein the first direction is perpendicular to the second direction.
In the technical scheme, the length of the MIMO antenna is prolonged through the radiation arm, so that the MIMO antenna is convenient to use. The length of the radiating area of the unit area is improved by improving the space utilization rate through the retractive extension of the radiating tail end, so that the radiating length of the MIMO antenna is reduced, the occupied area of the MIMO antenna is ensured, the high-efficiency transmission performance of the MIMO antenna is ensured, and the size of the MIMO antenna is reduced.
Further, the distance between the tail end of the fourth radiating arm of the first antenna unit and the tail end of the fourth radiating arm of the second antenna unit is lambda/6-lambda/4; wherein λ is the operating wavelength of the compact MIMO antenna, and λ= (c/f), c is the speed of light, and f is the operating frequency of the compact MIMO antenna.
In the technical scheme, the radiation size of the MIMO antenna is designed through the working frequency (or frequency band) of the MIMO antenna, so that the pertinence of receiving and transmitting the working frequency of the MIMO antenna is greatly improved, the identification degree of the MIMO antenna to the working frequency (or frequency band) of the MIMO antenna is improved, and the high-efficiency transmission performance of the corresponding working frequency (or frequency band) is further ensured.
Further, the extension length of the fifth radiation arm is lambda/10-2 lambda/15; wherein λ is the operating wavelength of the compact MIMO antenna, and λ= (c/f), c is the speed of light, and f is the operating frequency of the compact MIMO antenna; and/or the extension end of the fifth radiation arm is extended with a sixth radiation arm along the second direction or the opposite direction of the second direction.
Further, a seventh radiating arm is extended from the second end of the long bottom edge of the trapezoid radiating body along the second direction and far away from the trapezoid radiating body, and an eighth radiating arm is extended from the extended end of the seventh radiating arm along the first direction; wherein the first direction is perpendicular to the second direction.
In the technical scheme, the length of the MIMO antenna is prolonged through the radiation arm, so that the MIMO antenna is convenient to use. The length of the radiating area of the unit area is improved by improving the space utilization rate through the retractive extension of the radiating tail end, so that the radiating length of the MIMO antenna is reduced, the occupied area of the MIMO antenna is ensured, the high-efficiency transmission performance of the MIMO antenna is ensured, and the size of the MIMO antenna is reduced.
Further, the LED lamp further comprises a dielectric layer, wherein the GND is paved on the dielectric layer; the antenna unit is arranged perpendicular to or parallel to the dielectric layer.
In the technical scheme, the antenna unit and the GND are borne through the medium layer, so that the integration and modularization of the MIMO antenna are realized, the assembly and transportation of the MIMO antenna are convenient, the quality of the MIMO antenna is ensured, and the MIMO antenna is not easy to damage.
Further, the neutralization line is of a U-shaped structure, and an opening of the neutralization line is far away from the GND; a first opening end of the U-shaped structure extends towards the first antenna unit to form a first sub-neutral line, so that a first L-shaped bending part is formed by the first sub-neutral line and the first opening end; the second opening end of the U-shaped structure extends towards the second antenna unit to form a second sub-neutral line, so that the second sub-neutral line and the second opening end form a second L-shaped bending part.
In this technical scheme, neutralization line accessible sets up four L type kinks (first L type kink, second L type kink and two L type kinks of U type structure self) to get rid of the coupling current of two antenna unit, improved the isolation of two antenna unit, and then effectively reduced the signal interference between two antenna unit, thereby improved the signal transmission performance of MIMO antenna.
Further, the farthest distance between the first sub-neutral line and the GND is 3 lambda/50-6 lambda/50; wherein λ is the operating wavelength of the compact MIMO antenna, and λ= (c/f), c is the speed of light, and f is the operating frequency of the compact MIMO antenna; and/or the groove depth dimension of the U-shaped structure is lambda/22-lambda/18; wherein λ is the operating wavelength of the compact MIMO antenna, and λ= (c/f), c is the speed of light, and f is the operating frequency of the compact MIMO antenna.
In the technical scheme, the size of the neutralization line is determined through the working frequency (or frequency band) of the MIMO antenna, the decoupling effect of the neutralization line is improved, the pertinence of the MIMO antenna for receiving and transmitting the self working frequency is greatly improved, the identification degree of the MIMO antenna to the self working frequency (or frequency band) is improved, and the high-efficiency transmission performance of the corresponding working frequency (or frequency band) is further ensured.
The invention also provides a communication device provided with a compact MIMO antenna, comprising:
compact MIMO antennas and PCBs;
the compact MIMO antenna neutralization line and two antenna units, namely a first antenna unit and a second antenna unit; the first antenna unit and the second antenna unit are connected through the neutralization line, and the neutralization line at least comprises an L-shaped bending part; the antenna unit comprises a trapezoid radiation body, a grounding point used for being connected with GND and a feed point used for transmitting signals;
the long bottom edge of the trapezoid radiation body is far away from the GND; the long oblique side of the trapezoid radiation body is arranged close to the neutral line; the first end of the long bottom edge of the trapezoid radiation body is connected with the neutralization line, the second end of the long bottom edge of the trapezoid radiation body extends to form a radiation tail end, and the end point of the radiation tail end is close to the GND and is provided with a gap with the GND; a first end of a long bottom edge of the trapezoid radiation body extends towards the GND along a first direction, a tail end of the first radiation arm forms the grounding point, a short bottom edge of the trapezoid radiation body extends towards the GND and a second radiation arm forms the feed point;
the GND is arranged on the PCB;
the feed point is connected with a microstrip line or a coaxial line of the PCB.
In the technical scheme, the MIMO antenna is integrated to the PCB of the communication equipment, so that the space utilization rate and the high integration of the communication equipment are improved, the occupied area of the MIMO antenna is small, the signal transmission performance is high, and in practical application, the simultaneous preparation of the PCB and the MIMO antenna can be synchronously realized, so that the assembly efficiency of the communication equipment is improved, the production flow of the communication equipment is shortened, and the manufacturing cost is saved.
The compact MIMO antenna and the communication equipment comprising the same provided by the invention can bring at least one of the following beneficial effects:
1. in the invention, the two antenna units are creatively connected through the neutralization line provided with the L-shaped bending part, so that the close-range arrangement of the two antenna units is realized, but the high isolation is realized, the size of the MIMO antenna is greatly reduced, meanwhile, the antenna units arranged in the close range are not mutually interfered due to the high isolation, and the high-efficiency transmission performance of multiple transmission and multiple reception of the MIMO antenna is ensured. More preferably, the MIMO antenna has a simple structure, each radiating element has a simple geometric figure, and the MIMO antenna is easy to process and realize. And more preferably, the radiation tail end is arranged close to the GND and forms strong coupling with the GND, so that the MIMO antenna is easy to realize resonance even though the size is small, and has good receiving and transmitting performance. More preferably, the grounding point is arranged outside the inner part and the feeding point, so that the influence of the MIMO antenna structure on the signal transmission performance of the MIMO antenna structure is effectively avoided. In summary, the MIMO antenna has the advantages of small size, high isolation, simple structure, excellent signal transmission capability, good anti-interference performance and the like, and has good practicability, practicability and market prospect.
2. According to the invention, the length of the radiating tail end is prolonged by folding, so that the MIMO antenna is ensured to meet the length requirement, and meanwhile, the occupied area is small.
3. According to the invention, the design of each size of the MINO antenna is realized through the working frequency (or frequency band) of the MIMO antenna, so that the pertinence of receiving and transmitting the working frequency of the MIMO antenna is improved, the identification degree of the MIMO antenna to the working frequency (or frequency band) of the MIMO antenna is improved, and the high-efficiency transmission performance of the corresponding working frequency (or frequency band) is further ensured.
4. In the invention, the MIMO antenna has small size, but the first antenna unit and the second antenna unit can have similar structures; but may also be of dissimilar construction (the radiating end of the first antenna element is shown as being smaller than the length, width, thickness, etc. of the radiating end of the second antenna element); the structure that can realize multiple receipts is more, and the product type is various, can satisfy different customer demands.
Drawings
The foregoing features, technical features, advantages and implementation of a compact MIMO antenna and a communication device comprising the same will be further described in the following description of preferred embodiments with reference to the accompanying drawings in a clearly understandable manner.
Fig. 1 is a schematic structural diagram of a first embodiment of a compact MIMO antenna of the present invention;
fig. 2 is a schematic structural diagram of a second embodiment of the compact MIMO antenna of the present invention;
fig. 3 is a schematic structural diagram of a third embodiment of a compact MIMO antenna of the present invention;
fig. 4 is a schematic structural diagram of a fourth embodiment of a compact MIMO antenna of the present invention;
FIG. 5 is a schematic structural diagram of an embodiment of the communication device of the present invention;
fig. 6 is a return loss simulation diagram of the compact MIMO antenna of the present invention applied to a USB network card of the 2.4G band;
fig. 7 is a comparative simulation of the isolation between a compact MIMO antenna of the present invention and a MIMO antenna without the present neutralization line in the range of 2.4 to 2.5 GHz.
Reference numerals illustrate:
1. the antenna includes a first antenna element 11, a trapezoidal radiating body 111, a long bottom edge 112, a short bottom edge 12, a radiating end 121, a third radiating arm 122, a fourth radiating arm 123, a fifth radiating arm 124, a sixth radiating arm 125, a seventh radiating arm 126, an eighth radiating arm 127, a ninth radiating arm 13, a first radiating arm 131, a ground point 14, a second radiating arm 141, a feeding point 2, a second antenna element 3, a neutral line 31, a first sub-neutral line 32, a second sub-neutral line 33, a U-shaped structure 331, a third sub-neutral line 332, a fourth sub-neutral line 333, a fifth sub-neutral line 4.GND, a dielectric layer 5, a plastic housing 6, and a 7.USB interface.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will explain the specific embodiments of the present invention with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the invention, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.
For the sake of simplicity of the drawing, the parts relevant to the present invention are shown only schematically in the figures, which do not represent the actual structure thereof as a product. Additionally, in order to simplify the drawing for ease of understanding, components having the same structure or function in some of the drawings are shown schematically with only one of them, or only one of them is labeled. Herein, "a" means not only "only this one" but also "more than one" case. In this context, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In a first embodiment, as shown in fig. 1-3, a compact MIMO antenna includes: a neutralization line 3 and two antenna elements, namely a first antenna element 1 and a second antenna element 2; the first antenna unit 1 and the second antenna unit 2 are connected through a neutralization line 3, and the neutralization line 3 at least comprises an L-shaped bending part; the antenna unit includes a trapezoid radiation body 11, a ground point 131 connected to GND4, and a feeding point 141 for transmitting a signal; the long base 111 of the trapezoidal radiation body 11 is disposed away from GND 4; the long oblique side of the trapezoid radiation body 11 is arranged close to the neutralization line 3; the first end of the long bottom edge 111 of the trapezoid radiation body 11 is connected with the neutral line 3, the second end of the long bottom edge 111 of the trapezoid radiation body 11 is extended with a radiation end 12, and the end point of the radiation end 12 is close to GND4 and is provided with a gap with the GND 4; a first end of the long base 111 of the trapezoidal radiating body 11 extends with a first radiating arm 13 along a first direction towards GND4, a terminal end of the first radiating arm 13 forms a ground point 131, a short base 112 of the trapezoidal radiating body 11 extends with a second radiating arm 14 towards GND4, and a terminal end of the second radiating arm 14 forms a feeding point 141. In practical applications, GND4 may be a ground wire or a ground layer of the MIMO antenna itself, or GND4 may be a component having a ground wire or a ground layer used in combination with the MIMO antenna.
In the second embodiment, as shown in fig. 1 to 3, on the basis of the first embodiment, the second end of the long base 111 of the trapezoidal radiating body 11 is extended with a third radiating arm 121 along the opposite direction of the first direction, the extended end of the third radiating arm 121 is extended with a fourth radiating arm 122 along the second direction and away from the trapezoidal radiating body 11, and the extended end of the fourth radiating arm 122 is extended with a fifth radiating arm 123 along the first direction; wherein the first direction is perpendicular to the second direction; so that the third radiating arm 121, the fourth radiating arm 122 and the fifth radiating arm 123 constitute the radiating end 12 of the present MIMO antenna. Preferably, the extension end of the fifth radiation arm 123 is extended with a sixth radiation arm 124 in the second direction or the opposite direction of the second direction; so that the third radiating arm 121, the fourth radiating arm 122, the fifth radiating arm 123 and the sixth radiating arm 124 constitute the radiating end 12 of the present MIMO antenna.
In the third embodiment, as shown in fig. 4, on the basis of the first embodiment, a second end of the long bottom side 111 of the trapezoidal radiation body 11 is extended with a seventh radiation arm 125 along the second direction and away from the trapezoidal radiation body 11, and an extended end of the seventh radiation arm 125 is extended with an eighth radiation arm 126 along the first direction; wherein the first direction is perpendicular to the second direction such that the seventh radiating arm 125 and the eighth radiating arm 126 constitute the radiating end 12 of the present MIMO antenna. Preferably, the extension end of the eighth radiation arm 126 is extended with a ninth radiation arm 127 along the second direction or the opposite direction of the second direction; so that the seventh radiating arm 125, the eighth radiating arm 126, and the ninth radiating arm 127 constitute the radiating end 12 of the present MIMO antenna.
Table 1 the size table of the MIMO antenna
| Size of the device | |
| A | λ/6～λ/4 |
| B | λ/10～2λ/15 |
| C | 0.5mm～3mm |
| D | λ/22～λ/18 |
| E | λ/27～λ/23 |
| F | 3λ/50～6λ/50 |
| G | 1.5mm～5mm |
In the fourth embodiment, as shown in fig. 1 to 4, based on the first, second and third embodiments, the distance a of the MIMO antenna along the second direction is λ/6 to λ/4, where the second direction is perpendicular to the first direction. Preferably, the distance B of the radiating tip 12 in the first direction is λ/10 to 2λ/15. Preferably, the end point of the radiation tip 12 is at a distance C of 0.5mm to 3mm from GND4 in the first direction. Preferably, the neutralization line 3 extends a distance D in the first direction from λ/22 to λ/18. Preferably, the neutralization line 3 extends in the second direction a distance E of λ/27 to λ/23. Preferably, the furthest distance of the neutralization line 3 from GND4 is 3λ/50 to 6λ/50. Preferably, the distance G between the ground point 131 and the feeding point 141 is 1.5mm to 5mm. Where λ is the operating wavelength of the compact MIMO antenna, and λ= (c/f), c is the speed of light, and f is the operating frequency of the compact MIMO antenna. See, in particular, fig. 2 and table 1.
In the fifth embodiment, as shown in fig. 1 to 4, on the basis of the first, second, third or fourth embodiment, the neutralization line 3 is a U-shaped structure 33, the opening of which is disposed away from GND 4; the first opening end of the U-shaped structure 33 extends towards the first antenna unit 1 with a first sub-neutralization line 31, such that the first sub-neutralization line 31 and the first opening end form a first L-shaped bending part; the second opening end of the U-shaped structure extends towards the second antenna unit 2 to form a second sub-neutralization line 32, so that the second sub-neutralization line 32 and the second opening end form a second L-shaped bending part. Preferably, the U-shaped structure includes a third sub-neutralization line 331 connected to the first sub-neutralization line 31, a fifth sub-neutralization line 333 connected to the second sub-neutralization line 32, and a fourth sub-neutralization line 332 respectively connected to the third sub-neutralization line 331 and the fifth sub-neutralization line 333, wherein the third sub-neutralization line 331 and the fourth sub-neutralization line 332 form an L-shaped bent portion, and the fourth sub-neutralization line 332 and the fifth sub-neutralization line 333 form an L-shaped bent portion.
In this embodiment, the neutralization line may be configured by setting four L-shaped bending portions (the first L-shaped bending portion, the second L-shaped bending portion, and two L-shaped bending portions of the U-shaped structure), so as to remove coupling currents of two antenna units, improve isolation of the two antenna units, and further effectively reduce signal interference between the two antenna units, thereby improving signal transmission performance of the MIMO antenna. It should be noted that, in practical application, the neutralization line may also have an L-shaped structure with only one L-shaped bending portion, and may have a Z-shaped structure with two L-shaped bending portions, or a pi-shaped structure, or a U-shaped structure; the structure can be formed by sequentially splicing a plurality of (three or more) L-shaped bending parts. Preferably, the L-shaped bending part is preferably a right-angle L-shaped bending part; when the neutralization line includes a plurality of L-shaped bending portions, the plurality of L-shaped bending portions are preferably right-angle L-shaped bending portions. Preferably, the neutralization line is disposed between the first antenna element 1 and the second antenna element 2 in bilateral symmetry about a symmetry line extending in the first direction.
In the sixth embodiment, as shown in fig. 1 to 4, the shape of the trapezoidal radiating body 11 of the first antenna element 1 and the shape of the trapezoidal radiating body 11 of the second antenna element 2 are the same or similar on the basis of the first, second, third, fourth or fifth embodiments. Preferably, the shape of the radiating end 12 of the first antenna element 1 and the radiating end 12 of the second antenna element 2 are the same or similar (or the total length of the radiating end 12 of the first antenna element 1 and the radiating end 12 of the second antenna element 2 is different, or the shape of the radiating end 12 of the first antenna element 1 and the radiating end 12 of the second antenna element 2 is different). Preferably, the distance G between the ground point 131 of the first antenna element 1 and the feeding point 141 and the distance G between the ground point 131 of the second antenna element 2 and the feeding point 141 are equal or unequal. As can be seen from the above, the first antenna unit 1 and the second antenna unit 2 may be symmetrically arranged along a symmetry line extending along the first direction, so that the MIMO antenna is a symmetrical antenna. Of course, the first antenna unit 1 and the second antenna unit 2 may be similar antenna units or similar antenna units, so that the MIMO antenna is an asymmetric antenna. Preferably, the dielectric layer 5 is further included, and the GND4 is paved on the dielectric layer 5; the antenna unit is arranged vertically or in parallel with the dielectric layer 5; in this embodiment, the MIMO antenna itself has a carrier (i.e. a dielectric layer 5), and preferably, the first antenna unit 1, the neutralization line, and the second antenna unit 2 are tiled on the dielectric layer 5, so that the MIMO antenna is suitable for a communication device with a large size along the first direction and a small size along the second direction. The MIMO antenna is laid on the dielectric layer 5 by printing. The dielectric layer 5 is FR4 (epoxy glass laminated board), GND4 is laid on one side surface of FR4, and the first antenna unit 1, the second antenna unit 2 and the neutralization line are laid on one side surface of FR4 where GND4 is provided, so that the ground point 131 of the first antenna unit 1 is connected with GND4 of FR4, and the feeding point 141 of the first antenna unit 1 is connected with a microstrip line or a coaxial line on FR4 as a signal access point; the ground point 131 of the second antenna unit 2 is connected to GND4 of FR4, and the feeding point 141 of the second antenna unit 2 is connected to a microstrip line or a coaxial line on FR4 as a signal access point. Of course, in practical applications, the dielectric layer 5 may be a PCB or other materials, and the length, width and height of the dielectric layer 5 may be set according to practical needs. Of course, the first antenna unit 1, the neutral line and the second antenna unit 2 may also be vertically disposed on the dielectric layer 5, so that the MIMO antenna is suitable for a communication device with a small size along the first direction and a large size along the second direction, for example, by being disposed on the dielectric layer 5 in a pluggable manner. Note that, when the communication device itself includes the carrier carrying the first antenna unit 1, the second antenna unit 2, and the neutralization line, and the GND4, the MIMO antenna only needs to include the first antenna unit 1, the second antenna unit 2, and the neutralization line.
As shown in fig. 1, 2 and 5, the MIMO antenna of the present invention is applied to a USB network card in the 2.4G frequency band. The USB network card comprises a PCB, a MIMO antenna, a USB interface 7 and a plastic shell 6 covered on the PCB and the MIMO antenna, wherein the USB interface 7 is connected with the PCB, and a through groove is formed in the position of the plastic shell 6 corresponding to the USB interface 7; the MIMO antenna is arranged at the other end opposite to the USB interface 7; the MIMO antenna comprises a first antenna unit 1, a second antenna unit 2 and a neutralization line, wherein the first antenna unit 1 and the second antenna unit 2 are symmetrically arranged; the grounding point 131 of the first antenna unit 1 is connected with the GND4 of the PCB, and the feeding point 141 of the first antenna unit 1 is connected with a microstrip line or a coaxial line on the PCB as a signal access point; the grounding point 131 of the second antenna unit 2 is connected with the GND4 of the PCB, and the feed point 141 of the second antenna unit 2 is connected with a microstrip line or a coaxial line on the PCB as a signal access point; preferably, the structure and dimensions of the present MIMO antenna are specifically set up with reference to fig. 1, 2 and table 1. Through simulation, the return loss simulation result of the USB network card is obtained (as shown in fig. 5 and table 2), and referring to fig. 6 and table 2, it can be seen that the resonance working frequency bands of the first antenna unit 1 and the second antenna unit of the MIMO antenna cover the frequency band of 2.412-2.485 GHz (S11 < -10dB, S22< -10 dB) commonly used in WIFI. The distance between the two existing antenna units is changed from 80mm to 5mm, and the dimension of the two antenna units along the second direction is only 25mm, so that the MIMO antenna is greatly reduced in size while good transmission performance is met.
Table 2 echo loss simulation result of USB network card with MIMO antenna applied to 2.4G frequency band
| Name (Name) | X(GHz) | Y |
| m1 | 2.4120 | -11.0380 |
| m2 | 2.4850 | -12.5240 |
In addition, for further explanation, the isolation degree of the neutralization line is compared with that of the MIMO antenna, and referring to FIG. 7 and Table 3, when the neutralization line is not added to the MIMO antenna, the isolation degree of the MIMO antenna can only reach 7-11 dB within 2.4-2.5 GHz; after the neutralization line is added, the isolation of the MIMO antenna reaches more than 18dB, and the requirement that the isolation is more than 15dB (namely S12 < -15 dB) is met. It can be seen that the design of the bend neutralization line has very obvious effects on size reduction and isolation improvement. Therefore, the invention shortens the size of the MIMO antenna and improves the isolation degree by designing the neutralization line with the L-shaped bending part, thereby meeting the requirements of small size, high efficiency and high isolation degree of the MIMO antenna, meeting the trend of the increasingly microminiaturization of MIMO electronic products, having good practicability, applicability and market competitiveness and meeting the requirements of clients.
Table 3 isolation contrast table for MIMO antenna with or without neutralization line
In a seventh embodiment, as shown in fig. 1 to 5, a communication apparatus provided with a compact MIMO antenna, includes: compact MIMO antennas and PCBs; the compact MIMO antenna includes: a neutralization line and two antenna elements, namely a first antenna element 1 and a second antenna element 2; the first antenna unit 1 and the second antenna unit 2 are connected through a neutralization line, and the neutralization line at least comprises an L-shaped bending part; the antenna unit includes a trapezoid radiation body 11, a ground point 131 connected to GND4, and a feeding point 141 for transmitting a signal; the long base 111 of the trapezoidal radiation body 11 is disposed away from GND 4; the long oblique side of the trapezoid radiation body 11 is arranged close to the neutral line; the first end of the long bottom edge 111 of the trapezoid radiation body 11 is connected with a neutral line, the second end of the long bottom edge 111 of the trapezoid radiation body 11 is extended with a radiation end 12, and the end point of the radiation end 12 is close to GND4 and is provided with a gap with the GND 4; a first end of the long base 111 of the trapezoidal radiating body 11 extends along a first direction towards GND4 with a first radiating arm 13, a terminal end of the first radiating arm 13 forms a grounding point 131, a short base 112 of the trapezoidal radiating body 11 extends towards GND4 with a second radiating arm 14, and a terminal end of the second radiating arm 14 forms a feeding point 141; GND4 is arranged on the PCB; the feeding point 141 is connected to a microstrip line or a coaxial line of the PCB.
In the eighth embodiment, as shown in fig. 1 to 5, on the basis of the seventh embodiment, the second end of the long base 111 of the trapezoidal radiation body 11 is extended with a third radiation arm 121 in the opposite direction to the first direction, the extended end of the third radiation arm 121 is extended with a fourth radiation arm 122 in the second direction and away from the trapezoidal radiation body 11, and the extended end of the fourth radiation arm 122 is extended with a fifth radiation arm 123 in the first direction; wherein the first direction is perpendicular to the second direction; so that the third radiating arm 121, the fourth radiating arm 122 and the fifth radiating arm 123 constitute the radiating end 12 of the present MIMO antenna. Preferably, the extension end of the fifth radiation arm 123 is extended with a sixth radiation arm 124 in the second direction or the opposite direction of the second direction; so that the third radiating arm 121, the fourth radiating arm 122, the fifth radiating arm 123 and the sixth radiating arm 124 constitute the radiating end 12 of the present MIMO antenna.
In the ninth embodiment, as shown in fig. 1 to 5, on the basis of the seventh embodiment, the second end of the long base 111 of the trapezoidal radiation body 11 is extended with a seventh radiation arm 125 in the second direction and away from the trapezoidal radiation body 11, and the extended end of the seventh radiation arm 125 is extended with an eighth radiation arm 126 in the first direction; wherein the first direction is perpendicular to the second direction such that the seventh radiating arm 125 and the eighth radiating arm 126 constitute the radiating end 12 of the present MIMO antenna. Preferably, the extension end of the eighth radiation arm 126 is extended with a ninth radiation arm 127 along the second direction or the opposite direction of the second direction; so that the seventh radiating arm 125, the eighth radiating arm 126, and the ninth radiating arm 127 constitute the radiating end 12 of the present MIMO antenna.
In the tenth embodiment, as shown in fig. 1 to 5, on the basis of the seventh, eighth or ninth embodiment, the distance a of the MIMO antenna in the second direction is λ/6 to λ/4, where the second direction is perpendicular to the first direction. Preferably, the distance B of the radiating tip 12 in the first direction is λ/10 to 2λ/15. Preferably, the end point of the radiation tip 12 is at a distance C of 0.5mm to 3mm from GND4 in the first direction. Preferably, the neutralization line extends a distance D in the first direction from λ/22 to λ/18. Preferably, the neutralization line extends in the second direction a distance E of from λ/27 to λ/23. Preferably, the furthest distance of the neutralization line distance GND4 is 3λ/50 to 6λ/50. Preferably, the distance G between the ground point 131 and the feeding point 141 is 1.5mm to 5mm. Where λ is the operating wavelength of the compact MIMO antenna, and λ= (c/f), c is the speed of light, and f is the operating frequency of the compact MIMO antenna. See, in particular, fig. 2 and table 1.
In an eleventh embodiment, as shown in fig. 1 to 5, on the basis of the seventh, eighth, ninth or tenth embodiment, the neutralization line is of a U-shaped structure, and the opening thereof is disposed away from GND 4; a first sub-neutralization line extends towards the first antenna unit 1 from the first opening end of the U-shaped structure, so that a first L-shaped bending part is formed by the first sub-neutralization line and the first opening end; the second opening end of the U-shaped structure extends towards the second antenna unit 2 to form a second sub-neutralization line, so that the second sub-neutralization line and the second opening end form a second L-shaped bending part. In this embodiment, the neutralization line may be configured by setting four L-shaped bending portions (the first L-shaped bending portion, the second L-shaped bending portion, and two L-shaped bending portions of the U-shaped structure), so as to remove coupling currents of two antenna units, improve isolation of the two antenna units, and further effectively reduce signal interference between the two antenna units, thereby improving signal transmission performance of the MIMO antenna. It should be noted that, in practical application, the neutralization line may also have an L-shaped structure with only one L-shaped bending portion, and may have a Z-shaped structure with two L-shaped bending portions, or a pi-shaped structure, or a U-shaped structure; the structure can be formed by sequentially splicing a plurality of (three or more) L-shaped bending parts. Preferably, the L-shaped bending part is preferably a right-angle L-shaped bending part; when the neutralization line includes a plurality of L-shaped bending portions, the plurality of L-shaped bending portions are preferably right-angle L-shaped bending portions. Preferably, the neutralization line is disposed between the first antenna element 1 and the second antenna element 2 in bilateral symmetry about a symmetry line extending in the first direction.
In the twelfth embodiment, as shown in fig. 1 to 4, the shape of the trapezoidal radiation body 11 of the first antenna element 1 and the shape of the trapezoidal radiation body 11 of the second antenna element 2 are the same or similar on the basis of the seventh, eighth, ninth, tenth, or eleventh embodiment. Preferably, the shape of the radiating end 12 of the first antenna element 1 and the radiating end 12 of the second antenna element 2 are the same or similar (or the total length of the radiating end 12 of the first antenna element 1 and the radiating end 12 of the second antenna element 2 is different, or the shape of the radiating end 12 of the first antenna element 1 and the radiating end 12 of the second antenna element 2 is different). Preferably, the distance G between the ground point 131 of the first antenna element 1 and the feeding point 141 and the distance G between the ground point 131 of the second antenna element 2 and the feeding point 141 are equal or unequal. As can be seen from the above, the first antenna unit 1 and the second antenna unit 2 may be symmetrically arranged along a symmetry line extending along the first direction, so that the MIMO antenna is a symmetrical antenna. Of course, the first antenna unit 1 and the second antenna unit 2 may be similar antenna units or similar antenna units, so that the MIMO antenna is an asymmetric antenna.
As shown in fig. 5, an exemplary USB network card in 2.4G frequency band includes a PCB, a MIMO antenna, a USB interface 7, and a plastic housing 6 covering the PCB and the MIMO antenna, where the USB interface 7 is connected to the PCB, and a through slot is formed in the plastic housing 6 corresponding to the USB interface 7; the MIMO antenna is arranged at the other end opposite to the USB interface 7; the MIMO antenna comprises a first antenna unit 1, a second antenna unit 2 and a neutralization line, wherein the first antenna unit 1 and the second antenna unit 2 are symmetrically arranged; the grounding point 131 of the first antenna unit 1 is connected with the GND4 of the PCB, and the feeding point 141 of the first antenna unit 1 is connected with a microstrip line or a coaxial line on the PCB as a signal access point; the ground point 131 of the second antenna unit 2 is connected to GND4 of the PCB, and the feeding point 141 of the second antenna unit 2 is connected to a microstrip line or a coaxial line on the PCB as a signal access point. It should be noted that the MIMO antenna can also be applied to other communication devices, such as routers, set top boxes, air cats, computers, mobile phones, and hand rings.
It should be noted that the above embodiments can be freely combined as needed. The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (10)
1. A compact MIMO antenna comprising:
a neutralization line and two antenna elements, namely a first antenna element and a second antenna element;
the first antenna unit and the second antenna unit are connected through the neutralization line, and the neutralization line at least comprises an L-shaped bending part;
the antenna unit comprises a trapezoid radiation body, a grounding point connected with GND and a feed point used for transmitting signals;
the long bottom edge of the trapezoid radiation body is far away from the GND; the long oblique side of the trapezoid radiation body is arranged close to the neutral line; the first end of the long bottom edge of the trapezoid radiation body is connected with the neutralization line, the second end of the long bottom edge of the trapezoid radiation body extends to form a radiation tail end, and the end point of the radiation tail end is close to the GND and is provided with a gap with the GND; the first end of the long bottom edge of the trapezoid radiation body extends towards the GND along a first direction to form a first radiation arm, the tail end of the first radiation arm forms the grounding point, the short bottom edge of the trapezoid radiation body extends towards the GND to form a second radiation arm, and the tail end of the second radiation arm forms the feeding point.
2. The compact MIMO antenna of claim 1, wherein:
the distance between the end point of the radiation tail end and the GND is 0.5 mm-3 mm; and/or the number of the groups of groups,
the distance between the grounding point and the feeding point is 1.5 mm-5 mm; and/or the number of the groups of groups,
the size of the neutralization line along the second direction is lambda/27-lambda/23; wherein, the first direction is perpendicular to the second direction, λ is the working wavelength of the compact MIMO antenna, λ= (c/f), c is the speed of light, and f is the working frequency of the compact MIMO antenna; and/or the number of the groups of groups,
the extension lengths of the radiation end of the first antenna unit and the radiation end of the second antenna unit are different; and/or the number of the groups of groups,
the radiating areas of the trapezoidal radiating body of the first antenna unit and the trapezoidal radiating body of the second antenna unit are different.
3. The compact MIMO antenna of claim 1, wherein:
a second end of the long bottom edge of the trapezoid radiation body is extended with a third radiation arm along the reverse direction of the first direction, an extended end of the third radiation arm is extended with a fourth radiation arm along the second direction and far away from the trapezoid radiation body, and an extended end of the fourth radiation arm is extended with a fifth radiation arm along the first direction; wherein the first direction is perpendicular to the second direction.
4. A compact MIMO antenna as claimed in claim 3, wherein:
the distance between the tail end of the fourth radiating arm of the first antenna unit and the tail end of the fourth radiating arm of the second antenna unit is lambda/6-lambda/4; wherein λ is the operating wavelength of the compact MIMO antenna, and λ= (c/f), c is the speed of light, and f is the operating frequency of the compact MIMO antenna.
5. A compact MIMO antenna as claimed in claim 3, wherein:
the extension length of the fifth radiation arm is lambda/10-2 lambda/15; wherein λ is the operating wavelength of the compact MIMO antenna, and λ= (c/f), c is the speed of light, and f is the operating frequency of the compact MIMO antenna; and/or the number of the groups of groups,
the extension end of the fifth radiation arm is extended with a sixth radiation arm along the second direction or the opposite direction of the second direction.
6. The compact MIMO antenna of claim 1, wherein:
a seventh radiating arm is extended from the second end of the long bottom edge of the trapezoid radiating body along the second direction and far away from the trapezoid radiating body, and an eighth radiating arm is extended from the extended end of the seventh radiating arm along the first direction; wherein the first direction is perpendicular to the second direction.
7. The compact MIMO antenna of claim 1, further comprising:
the GND is arranged on the dielectric layer;
the antenna unit is vertically arranged on the dielectric layer or horizontally arranged on the dielectric layer.
8. The compact MIMO antenna of any one of claims 1-7, wherein:
the neutralization line is of a U-shaped structure, and an opening of the neutralization line is far away from the GND;
a first opening end of the U-shaped structure extends towards the first antenna unit to form a first sub-neutral line, so that a first L-shaped bending part is formed by the first sub-neutral line and the first opening end;
the second opening end of the U-shaped structure extends towards the second antenna unit to form a second sub-neutral line, so that the second sub-neutral line and the second opening end form a second L-shaped bending part.
9. The compact MIMO antenna of claim 8, wherein:
the farthest distance between the first sub-neutral line and the GND is 3 lambda/50-6 lambda/50; wherein λ is the operating wavelength of the compact MIMO antenna, and λ= (c/f), c is the speed of light, and f is the operating frequency of the compact MIMO antenna; and/or the number of the groups of groups,
the groove depth of the U-shaped structure is lambda/22-lambda/18; wherein λ is the operating wavelength of the compact MIMO antenna, and λ= (c/f), c is the speed of light, and f is the operating frequency of the compact MIMO antenna.
10. A communication device provided with a compact MIMO antenna, comprising:
compact MIMO antennas and PCBs;
the compact MIMO antenna neutralization line and two antenna units, namely a first antenna unit and a second antenna unit; the first antenna unit and the second antenna unit are connected through the neutralization line, and the neutralization line at least comprises an L-shaped bending part; the antenna unit comprises a trapezoid radiation body, a grounding point used for being connected with GND and a feed point used for transmitting signals;
the long bottom edge of the trapezoid radiation body is far away from the GND; the long oblique side of the trapezoid radiation body is arranged close to the neutral line; the first end of the long bottom edge of the trapezoid radiation body is connected with the neutralization line, the second end of the long bottom edge of the trapezoid radiation body extends to form a radiation tail end, and the end point of the radiation tail end is close to the GND and is provided with a gap with the GND; a first end of a long bottom edge of the trapezoid radiation body extends towards the GND along a first direction, a tail end of the first radiation arm forms the grounding point, a short bottom edge of the trapezoid radiation body extends towards the GND and a second radiation arm forms the feed point;
the GND is arranged on the PCB;
the feed point is connected with a microstrip line or a coaxial line of the PCB.
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