CN106876921A - A kind of mimo antenna of compact high degree of isolation - Google Patents
A kind of mimo antenna of compact high degree of isolation Download PDFInfo
- Publication number
- CN106876921A CN106876921A CN201510938537.7A CN201510938537A CN106876921A CN 106876921 A CN106876921 A CN 106876921A CN 201510938537 A CN201510938537 A CN 201510938537A CN 106876921 A CN106876921 A CN 106876921A
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- China
- Prior art keywords
- antenna
- isolation
- circle
- line
- high degree
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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
- H01Q1/523—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas between antennas of an array
-
- 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
Abstract
The present invention relates to a kind of mimo antenna of compact high degree of isolation, it is characterised in that it includes：The first antenna unit (A) of specular, second day unit (B), Rectangular Enclosure with Participating Media substrate (2), between the metal ground plate (4) at the medium substrate back side, 50 ohm of feeder lines (3), isolation neutralizes line (5), wherein two circular antenna units are located at the upper surface that (A, B) is located at medium substrate (4), and on central shaft specular；Line (5) is neutralized positioned at the centre of two circular antennas, and on central shaft specular.The advantage of the invention is that：Antenna structure is compact, miniaturization, save space；The beamwidth of antenna is wider, has good radiation characteristic in 4GHz-6GHz；The degree of isolation of antenna element is high, and all below -24dB, the isolation at centre frequency reaches -30dB to the degree of isolation in working band.
Description
Technical field
The present invention relates to a kind of mimo antenna for wireless communication field, and in particular to a kind of compact high degree of isolation
Mimo antenna.
Background technology
In recent years, mobile communications industry is developed rapidly, the forth generation GSM 4G of most of country of the world
(The Fourth Generation Mobile Communication System) communication formally puts it into commercial operation.It is acknowledged as 4G's
Therefore the MIMO technology of one of core technology has also obtained great concern in communication industry.
With the growing demand of user, the transmission of mobile communication also gradually needs to become more reliable, more efficient and higher
Speed.But the current available frequency resource of GSM has become extremely limited and preciousness, therefore can not pass through again
Many frequency spectrums increase the channel capacity and reliability of system.MIMO technology communicated as 4G in one of key technology,
In signals transmission, the channel capacity of communication system can be exponentially improved on the basis of extra frequency spectrum resource is not sacrificed,
The reliability of channel can also be improved simultaneously, reduce bit error rate etc..
One mimo system typically include space-time coding/decoding module, modulus/D/A converter module, modulation/demodulation modules
And antenna system.Wherein antenna system be whole system foremost, the quality of antenna will direct influence whole system performance
Quality.MIMO technology refers to that multiple transmitting antennas and reception antenna are respectively adopted in transmitting and receiving terminal to carry out space diversity
Technology, it uses discrete multiple antennas, communication link effectively can be decomposed into many parallel subchannels, so that
Greatly improve capacity.As a rule, the multipath fading of channel is considered as the factor of harm, information theory it has been proved that when different connect
When receiving orthogonal between antenna and different transmitting antennas, MIMO technology can be used to multipath effect, and multipath is declined
The adverse factor of channel of falling is changed into favorable factor, so as to improve the anti-fading and noiseproof feature of whole mimo system, therefore can be with
Obtain huge capacity.
Mimo antenna design is one of three big key technologies of the MIMO communication technologys.By receiver or emitter chi
Very little and structure limitation, it is necessary to arrange antenna element as much as possible in limited space, to antenna element and antenna array design
Propose requirements at the higher level.Because the factors such as the number of the design of antenna element, array element, array structure and arrangement mode are direct
Influence the spatial coherence of mimo channel.Each antenna element has less correlation in how causing array in limited space
Property so that the corresponding matrix of mimo channel is close to full rank, and it is mimo antenna design to obtain mimo system maximum capacity
Difficult point.
The content of the invention
Mimo antenna array it is an object of the invention to design a compact high isolation suitable for mimo system, should
Antenna realizes the high degree of isolation of two circular antenna units using line is neutralized well, and the mutual coupling for preferably reducing antenna element is special
Property, the structure that makes antenna is compacter, miniaturization, meets the requirement of modern mimo system.
The technical solution adopted in the present invention：
A kind of mimo antenna of compact high degree of isolation, it is characterised in that it includes：The first antenna unit of specular
(A), second day unit (B), Rectangular Enclosure with Participating Media substrate (2), 50 ohm of feeder lines (3), the metal between the medium substrate back side connects
Floor (4), isolation neutralizes line (5), wherein two circular antenna units are located at the upper surface that (A, B) is located at medium substrate (2),
And on central shaft specular；Line (5) is neutralized positioned at the centre of two circular antennas, and on central shaft specular.
The mimo antenna of described a kind of compact high degree of isolation, it is characterised in that under the radiation fin of two circular antennas
End is symmetrical to be introduced in two L-types and line, is neutralized line one and is terminated first antenna unit (A), the second antenna element of a termination (B).
Described a kind of UWB antennas based on defect ground structure, it is characterised in that two intersections for neutralizing line are one
Cirque structure (5), the center of circle of inner circle and the cylindrical center of circle are on same vertical line, but two centers of circle are misaligned, inner circle center of circle position
In the surface in the cylindrical center of circle.
The mimo antenna of described a kind of compact high degree of isolation, it is characterised in that metal ground plate (4) connects for part
Floor, the height of earth plate and 50 ohm of feeder lines it is highly identical.
The invention has following characteristic and advantage：
The antenna structure is simple, and antenna element is the radiating element of two circles, compact conformation, and the spacing of unit is smaller within two days,
Antenna can be made more to minimize on the premise of performance is not influenceed.
Mutual coupling between antenna element can be effectively reduced by neutralizing line, the isolation between antenna is reached -30dB.
The degree of coupling between antenna can be improved by adjusting the exradius of neutralization line annulus and the size of inner circle radius,
The performance in day can also be improved by changing the position in the inner circle center of circle.
The antenna has bandwidth wider, and between 4GHz-6GHz, bandwidth range is in ultra-wideband bandwidth for day bandwidth
In (3.1-10.6GHz), can be used for ultra wide band.The antenna has good radiation characteristic, the echo at centre frequency
Loss can reach -17dB.
Brief description of the drawings
Fig. 1-1 is the basic structure top view of embodiment of the present invention 1；
Fig. 1-2 is the side view of embodiment of the present invention 1；
Fig. 2-1 is the basic structure of the aerial array of embodiment of the present invention 1；
Fig. 2-2 is the basic structure of the metal ground plate of embodiment of the present invention 1；
Fig. 3-1 is the S11 of the antenna element of embodiment of the present invention 1, S12 parameters；
Fig. 3-2 is the S parameter of the crosstalk of the antenna ends of embodiment of the present invention 1 mouthful；
Fig. 3-3 is the embodiment of the present invention gain of 1 day.
Specific embodiment
The present invention will be further described below in conjunction with the accompanying drawings, but protection scope of the present invention be not limited to it is as described below.
An example of the present invention as Figure 1-1, a kind of mimo antenna of compact high degree of isolation, it includes：Mirror image
Symmetrical first antenna unit (A), second day unit (B), Rectangular Enclosure with Participating Media substrate (2), 50 ohm of feeder lines (3), between Jie
The metal ground plate (4) of matter substrate back, isolation neutralizes line (5), wherein two circular antenna units are located at (A, B) and are located at being situated between
The upper surface of matter substrate (2), and on central shaft specular；Line (5) is neutralized positioned at the centre of two circular antennas, and
And on central shaft specular.
As Figure 1-1, medium substrate (2) is the FR-4 that relative dielectric constant is 4.4 to an example of the present invention.Jie
The thickness of matter substrate is 0.8mm, and width is W, and length is L.
As shown in Figure 1-2, the radiating element of the antenna is located at the upper surface of medium substrate, and metal ground plate is located at medium substrate
Lower surface, the height of metal ground plate is H.
As shown in Fig. 2-1, the radiating element of antenna is circular microstrip line, and round radius is R1, and two antenna elements are on axle
Symmetrical to being mirrored into, the distance between antenna element is d；50 ohm of lower edge alignment of the lower edge and medium substrate of feeder line,
The line width of feeder line is g.
As shown in Fig. 2-1, the line width for neutralizing line is S2, is S1 with 50 ohm of distances of feeder line；Neutralize line intermediate circular section
Exceptionally round radius is R2, and the radius of inner circle is R3；The inner circle center of circle is located along the same line with the cylindrical center of circle, inner circle center of circle position
In the surface in the cylindrical center of circle.
As shown in Fig. 2-2, metal ground plate is part metals ground, and it is highly h.
As shown in figure 3-1, the antenna has good radiance on 4GHz-6GHz, at centre frequency 4.5GHz
Return loss reach below -16dB.
As shown in figure 3-2, the isolation of two antenna elements can preferably reach -30dB in working band, in whole work frequency
Band in isolation all below -26dB, with good isolation.
A kind of mimo antenna of compact high degree of isolation of the invention, design parameter：
The selection of medium substrate：Relative dielectric constant is 4.4 FR4 materials, FR4 materials have electrical insulation capability stabilization,
Flatness is good, surface is smooth, without pit, thickness deviation standard the characteristics of, its excellent electrical properties, operating temperature is higher,
Performance itself is affected by environment small, is common used material, is easy to make and industrial production.Many radiation patch and Jie on medium substrate
Metal ground plate under matter substrate uses copper product.
In general the center radiation frequency of monopole antenna is approximately equal to the radiation frequency of the cylindrical wire of same homalographic, and design should
The centre frequency of antenna is 4.5GHz, and the resonant frequency according to cylindrical wire calculates formula and can be calculated the size of radiation fin.
Such as Fig. 1-1, Fig. 2-1, shown in Fig. 2-2, the specific size of the mimo antenna is：W=35mm, L=33mm,
R1=5.1mm, R2=4.5mm, R3=2.1mm, S1=1.3mm, S2=1mm, h=17mm, g=1mm, d=2.2mm,
H1=7.2mm.
Claims (4)
1. a kind of mimo antenna of compact high degree of isolation, it is characterised in that it includes：Aerial array (1) is including mirror image pair
The first antenna unit (A) of title, second day unit (B), Rectangular Enclosure with Participating Media substrate (2), 50 ohm of feeder lines (3), between
The metal ground plate (4) at the medium substrate back side, isolation neutralizes line (5), wherein two circular antenna units are located at (A, B) position
In the upper surface of medium substrate (4), and on central shaft specular；Neutralization line (5) is in two circular antennas
Between, and on central shaft specular.
2. the mimo antenna of a kind of compact high degree of isolation according to claim 1, it is characterised in that in two circular antennas
The lower end of radiation fin is symmetrical to be introduced in two L-types and line, is neutralized line one and is terminated first antenna unit (A), a termination the
Two antenna elements (B).
3. the mimo antenna of a kind of compact high degree of isolation according to claim 1, it is characterised in that two neutralize lines
Intersection is a cirque structure (5), and the center of circle of inner circle and the cylindrical center of circle are on same vertical line, but two centers of circle are misaligned,
The inner circle center of circle is located at the surface in the cylindrical center of circle.
4. a kind of mimo antenna of compact high degree of isolation according to claim 1, it is characterised in that metal ground plate (4)
Be partial earthing plate, the height of earth plate and 50 ohm of feeder lines it is highly identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510938537.7A CN106876921A (en) | 2015-12-10 | 2015-12-10 | A kind of mimo antenna of compact high degree of isolation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510938537.7A CN106876921A (en) | 2015-12-10 | 2015-12-10 | A kind of mimo antenna of compact high degree of isolation |
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| Publication Number | Publication Date |
|---|---|
| CN106876921A true CN106876921A (en) | 2017-06-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510938537.7A Pending CN106876921A (en) | 2015-12-10 | 2015-12-10 | A kind of mimo antenna of compact high degree of isolation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109103597A (en) * | 2018-08-03 | 2018-12-28 | 瑞声精密制造科技(常州)有限公司 | Multiaerial system and mobile terminal |
| CN113300105A (en) * | 2021-04-29 | 2021-08-24 | 郑州中科集成电路与信息系统产业创新研究院 | Ultra-wideband multiple-input multiple-output antenna with high isolation |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202513284U (en) * | 2012-01-18 | 2012-10-31 | 华南理工大学 | MIMO antenna for raising isolation by using broadband T type neutral line |
-
2015
- 2015-12-10 CN CN201510938537.7A patent/CN106876921A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202513284U (en) * | 2012-01-18 | 2012-10-31 | 华南理工大学 | MIMO antenna for raising isolation by using broadband T type neutral line |
Non-Patent Citations (1)
| Title |
|---|
| SHUAI ZHANG等: "Mutual Coupling Reduction for UWB MIMO Antennas With a Wideband Neutralization Line", 《IEEE XPLORE DIGITAL LIBRARY》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109103597A (en) * | 2018-08-03 | 2018-12-28 | 瑞声精密制造科技(常州)有限公司 | Multiaerial system and mobile terminal |
| CN113300105A (en) * | 2021-04-29 | 2021-08-24 | 郑州中科集成电路与信息系统产业创新研究院 | Ultra-wideband multiple-input multiple-output antenna with high isolation |
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