CN109149108A - A kind of isolator and mimo antenna - Google Patents
A kind of isolator and mimo antenna Download PDFInfo
- Publication number
- CN109149108A CN109149108A CN201811031141.4A CN201811031141A CN109149108A CN 109149108 A CN109149108 A CN 109149108A CN 201811031141 A CN201811031141 A CN 201811031141A CN 109149108 A CN109149108 A CN 109149108A
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- Prior art keywords
- isolator
- medium substrate
- antenna
- piece
- radiating element
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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
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
- H01Q19/104—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces using a substantially flat reflector for deflecting the radiated beam, e.g. periscopic antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/061—Two dimensional planar arrays
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- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The invention belongs to wireless communication technology fields, disclose a kind of isolator and mimo antenna, isolator includes the first isolator, first isolator is located at the top of radiation cell array, first isolator includes medium substrate, guides piece, decoupling item into, guide piece into, decoupling item is arranged on medium substrate, guides the surface that piece is located at radiating element into, decoupling item is between two column radiating elements;Mimo antenna includes antenna-reflected plate, radiating element and above-mentioned isolator.The present invention solves the problems, such as mimo antenna (5G large scale array antenna) isolation difference and pattern distortion in the prior art.
Description
Technical field
The invention belongs to wireless communication technology fields, and in particular to a kind of isolator and mimo antenna.
Background technique
With the high speed development of intelligent mobile terminal, wireless data traffic exponentially increases, the introducing of Internet of Things and fast
Speed development, puts forward higher requirements future broadband wireless communication systems.
Traditional 2D-MIMO technology, antenna generally use one-dimensional linear array antenna, port number is less cause wave wide compared with
Width, interfere between base station it is more serious, and can only be in horizontal dimensions machinery adjustment beam direction, can not be by the energy of vertical dimensions
User terminal is focused on, communication efficiency is lower.Relative to traditional 2D-MIMO technology, in 3D-MIMO technology, antenna uses two
Extensive planar array is tieed up, by beam shaping, is able to achieve compared with narrow beam, is interfered and substantially reduce between base station;In addition, according to
The position at family, wave beam can be adjusted and be tracked in real time in horizontal dimensions and vertical dimensions, remain that beam energy focuses on user
Terminal, communication quality greatly improve;More users can be serviced with frequency simultaneously, message capacity is greatly improved.
Extensive planar array antenna unit number is more, under the conditions of certain working frequency, between the group battle array of reduction unit
Away from antenna size can be effectively reduced, more antenna amounts can be laid out under unit area, weight is lighter, cuts operating costs.
However, to will lead to the energy mutual coupling between unit stronger for the reduction of antenna array spacing, and then isolation between antennas is caused to be deteriorated, direction
Figure generates distortion, so as to cause the deterioration of antenna performance index, influences communication efficiency.
Summary of the invention
The embodiment of the present application solves large scale array in the prior art by providing a kind of isolator and mimo antenna
The poor problem of the isolation of antenna.
The embodiment of the present application provides a kind of isolator, comprising: the first isolator, first isolator are located at spoke
Penetrate the top of cell array, first isolator includes medium substrate, guides piece, decoupling item into, described to guide piece into, described go
Coupling item is arranged on the medium substrate, and the surface guided piece into and be located at the radiating element, the decoupling item is located at
Between two column radiating elements.
Preferably, described guide piece into, the decoupling item is distributed as in following distribution mode on the medium substrate
It is a kind of:
It is described guide piece into, the decoupling item is respectively positioned on the bottom surface of the medium substrate;
It is described guide piece into, the decoupling item is respectively positioned on the top surface of the medium substrate;
The piece of guiding into is located on the bottom surface of the medium substrate, and the decoupling item is respectively positioned on the medium substrate
On top surface;
The piece of guiding into is located on the top surface of the medium substrate, and the decoupling item is respectively positioned on the medium substrate
On bottom surface.
Preferably, the thickness of the medium substrate is between 0.0058 λ -0.035 λ, the dielectric constant of the medium substrate
Between 2.2-9.8, wherein λ is radiating element centre frequency corresponding wavelength in free space transmission.
Preferably, the distance between the bottom surface of the medium substrate and the radiating surface top surface of the radiating element are in 3mm-
Between 8mm.
Preferably, the medium substrate is the medium of a monolith medium substrate or the medium substrate by several fritters
Substrate composition.
Preferably, the isolator further includes the second isolator, and second isolator is arranged in antenna-reflected
On plate, and between adjacent radiation unit.
Preferably, second isolator is isolation board, and the isolation board uses copper, aluminium or PCB double-sided copper-clad system
It forms.
Preferably, the length of the isolation board is between 0.2 λ -0.6 λ, and width is between 0.0117 λ -0.0467 λ, thickness
Between 0.5mm-1.5mm, wherein λ is radiating element centre frequency corresponding wavelength in free space transmission.
Preferably, the isolation board is rectangle or city wall shape.
On the other hand, the embodiment of the present application provides a kind of mimo antenna, including antenna-reflected plate, radiating element and above-mentioned
Isolator.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
In the embodiment of the present application, the first isolator is located at the top of radiation cell array, and the first isolator includes
Medium substrate, guide into piece, decoupling item, guide into piece, decoupling item be arranged on medium substrate, guide piece into and be located at radiating element just
Top decouples item between two column radiating elements.The piece of guiding into of first isolator is transmitted by electromagnetic coupling, is received
MIMO radiating element portion energy generates weaker induced electricity magnetostatic wave signal, inductive current direction and cross polarization electromagnetic wave
Current component is reversed, to offset partial intersection polarization components, improves isolation and cross polarization ratio between radiating element polarization,
In addition, induced current reaches radiating element position after certain space length (guiding height of the piece from radiating element into) transmission
When setting, current direction is identical with the current direction of radiating element, so that the directivity factor of antenna radiation unit is improved, before improvement
After compare;Mimo antenna group battle array spacing is smaller (0.5 λ, λ are wavelength of the Antenna Operation centre frequency in free space transmission), electromagnetism
The Space Coupling of wave is more serious, and the isolation between mimo antenna different lines is poor, and the decoupling item of the first isolator is to spoke
The radiant electromagnetic energy for penetrating unit has certain reflex, to weaken influencing each other between antenna element, improves day
Isolation between line different lines.To sum up, the first isolator can effectively improve the mutual coupling relationship of large scale array antenna, improve
The indexs such as isolation and front and back ratio between unit.
Detailed description of the invention
It, below will be to needed in embodiment description in order to illustrate more clearly of the technical solution in the present embodiment
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is one embodiment of the present of invention, general for this field
For logical technical staff, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of left view of isolator provided in an embodiment of the present invention;
Fig. 2 is a kind of top view of isolator provided in an embodiment of the present invention;
Fig. 3 is the top view of the first isolator in a kind of isolator provided in an embodiment of the present invention;
Fig. 4 is the first structure distribution signal of the first isolator in a kind of isolator provided in an embodiment of the present invention
Figure;
Fig. 5 is second of structure distribution signal of the first isolator in a kind of isolator provided in an embodiment of the present invention
Figure;
Fig. 6 is the third structure distribution signal of the first isolator in a kind of isolator provided in an embodiment of the present invention
Figure;
Fig. 7 is the 4th kind of structure distribution signal of the first isolator in a kind of isolator provided in an embodiment of the present invention
Figure;
Fig. 8 is the schematic diagram that medium substrate is made of several fritters in a kind of isolator provided in an embodiment of the present invention;
Fig. 9 is the first structural schematic diagram for guiding piece in a kind of isolator provided in an embodiment of the present invention into;
Figure 10 is second of structural schematic diagram for guiding piece in a kind of isolator provided in an embodiment of the present invention into;
Figure 11 is the third structural schematic diagram for guiding piece in a kind of isolator provided in an embodiment of the present invention into;
Figure 12 is the 4th kind of structural schematic diagram for guiding piece in a kind of isolator provided in an embodiment of the present invention into;
Figure 13 is the 5th kind of structural schematic diagram for guiding piece in a kind of isolator provided in an embodiment of the present invention into;
Figure 14 is the schematic diagram that item is decoupled in a kind of isolator provided in an embodiment of the present invention;
Figure 15 is the top view of the second isolator in a kind of isolator provided in an embodiment of the present invention;
Figure 16 is the left view of the second isolator in a kind of isolator provided in an embodiment of the present invention;
Figure 17 is isolation curve simulation comparison figure;
Figure 18 is normalized gain curve simulation comparison figure.
Wherein, the 10-the first isolator, 101-medium substrates, 102-guide piece into, 103-decoupling items, and 20-the second
Isolator, 301-radiating elements, 302-antenna-reflected plates.
Specific embodiment
In order to better understand the above technical scheme, in conjunction with appended figures and specific embodiments to upper
Technical solution is stated to be described in detail.
Referring to Fig. 1, Fig. 2, the embodiment of the present invention provides the isolator for being used for large scale array antenna, mainly includes first
Isolator 10 can also include the second isolator 20 in preferred scheme simultaneously.Wherein, first isolator 10 is located at
The top of radiation cell array, first isolator 10 includes medium substrate 101, guides piece 102, decoupling item 103 into, described
Guide piece 102 into, the decoupling item 103 is arranged on the medium substrate 101, the piece 102 of guiding into is located at the radiation singly
The surface of member 301, the decoupling item 103 is between two column radiating elements 301.Wherein, so the second isolator 20 is set
It sets on antenna-reflected plate 302, and between adjacent radiation unit 301.
Therefore, in the case where including first isolator 10 and second isolator 20 at the same time, decoupling dress
It sets and is related to the first isolator 10, the second isolator 20, and (wrapped with the associated large scale array antenna structure of isolator
Include radiating element 301, antenna-reflected plate 302).
By plastic support post, first isolator 10 is connected with antenna, at first isolator 10
The top of radiating element 301 described in antenna, the described of first isolator 10 guide 102 position of piece into and are located at the radiation
The surface of unit 301 is in periodic arrangement, the medium base of first isolator 10 with the radiating element 301
The distance between the bottom surface of plate 101 and the top surface of 301 radiating surface of radiating element are H, 3mm≤H≤8mm.
The inductive current direction for guiding piece generation into of first isolator and the current component of cross polarization electromagnetic wave
Reversely, to offset partial intersection polarization components, meanwhile, when induced current reaches radiating element position, current direction and radiation
The current direction of unit is identical, enhances antenna directivity;Decoupling item has the radiant electromagnetic energy of radiating element certain anti-
The effect of penetrating weakens the relationship that intercouples between antenna element, improves Space Coupling, and the mutual coupling that can effectively improve mimo antenna is closed
The indexs such as isolation and the front and back ratio between unit improve in system.In addition, guiding piece into and decoupling item is symmetrical, energy maximum
Limit reduces the influence to radiating element field distribution, and to antenna, other Index Influences are smaller, guarantees other indexs of antenna substantially not
Become.
Second isolator (i.e. isolation board) is located among the column of mimo antenna, passes through welding (it is best to be fully welded effect)
Isolation board is fixed on the floor of installation radiating element.After antenna radiation unit excitation, surface can be generated on antenna floor
Traveling wave, surface wave transmit on floor, encounter edges of boards either via hole etc., can generate secondary radiation, influence the directional diagram of antenna
(pattern distortion);After being transferred to the feeding point of other radiating elements, surface wave coupling is generated, influences the finger such as isolation between antennas
Mark.Second isolator isolation board changes the current distribution of secondary radiation field, weakens secondary radiation and radiates to radiating element itself
The influence of field improves antenna pattern distortion, while also improving surface wave coupling, promotes isolation between antennas.To sum up, described second
Isolator can effectively improve the mutual coupling relationship of mimo antenna, hence it is evident that improve the lopsided problem of unit horizontal surface radiation directional diagram,
The radiance index of lift unit and complete machine.
It should be noted that first isolator 10 and described this two parts of second isolator 20 can be applied simultaneously
In mimo antenna, it is also possible to one of certain applications in mimo antenna, such as only described first isolator 10
Applied in mimo antenna.
It should be noted that the decoupling item 103 is auxiliary device, if add the decoupling item 103 can be according to practical feelings
Condition is in optimized selection.
The component part of the isolator 10 is stated medium substrate 101, described guides piece 102, the decoupling item into
103, as shown in Figure 3.Wherein, described guide piece 102 into, the decoupling item 103 is distributed on the medium substrate 101.When described
Guide piece 102 into, the decoupling item 103 exists simultaneously when on the medium substrate 101, described to guide piece 102, the decoupling item into
103 position distribution can be on the same plane of the medium substrate 101, can also be at two of the medium substrate 101
Plane (being under normal circumstances the "top" of medium substrate, "bottom" face) is in optimized selection guides piece, decoupling item into according to the actual situation
The plane at place.Referring to fig. 4~Fig. 7, specific there are four types of distribution modes: 1. described to guide piece 102, the decoupling item 103 distribution into
In the bottom surface of the medium substrate 101;2. piece 102 is guided into described in, the decoupling item 103 is distributed in the medium substrate 101
Top surface;3. described guide the bottom surface that piece 102 is distributed in the medium substrate 101 into, the decoupling item 103 is distributed in the medium base
The top surface of plate 101;4. described guide the top surface that piece 102 is distributed in the medium substrate 101 into, the decoupling item 103 is distributed in institute
State the bottom surface of medium substrate 101;Above-mentioned four kinds of distribution modes can be in optimized selection according to practical application.
For the thickness of the medium substrate 101 between 0.0058 λ -0.035 λ, λ is antenna radiation unit centre frequency certainly
Corresponding wavelength when by space propagation.The dielectric constant of the medium substrate 101 is between 2.2-9.8.
As shown in figure 8, the medium substrate 101 can be a monolith also and can be divided into several fritters, according to practical application feelings
Condition selection.The medium substrate 101, which is divided into several fritters, can reduce antenna weights, and the size of several fritters is the same, specific size
It is split by the periodically variable line number of antenna, is connect by plastic support post with antenna.
The piece 102 of guiding into is distributed on the medium substrate 101, and 102 shape of piece of guiding into can be with are as follows: rectangular, circle
Shape, Fang Huan, cross, annulus, as shown in Fig. 9~Figure 13.The surface guided piece 102 into and be located at the radiating element 301;
The quantity M for guiding piece 102 into is less than or equal to the quantity N, i.e. M≤N of the radiating element 301.Generally, described to guide piece into
102 quantity and the quantity of the radiating element 301 are equal, i.e. all radiating elements 301 of antenna are all guided into added with described
Piece 102, i.e. M=N.Under some applicable cases, a certain column of antenna are either in the radiation in periodically variable column
Unit 301 do not need plus it is described guide piece 102 into, remaining described radiating element 301 need plus it is described guide piece 102 into, at this point, M
< N.
Composition cross guides the metal strip length of piece between 0.117 λ -0.233 λ, and width is in 0.0117 λ -0.0467 λ
Between.Circle guides the diameter of piece between 0.14 λ -0.21 λ.Annulus guides piece axis of great circle into 0.14 λ -0.21 λ, and ring width exists
Between 0.0117 λ -0.0583 λ.Rectangular piece side length of guiding into is between 0.117 λ -0.233 λ.Square 0.14 λ of ring large square side length-
0.21 λ, ring width is between 0.0117 λ -0.0583 λ.
The decoupling item 103 is distributed on the medium substrate 101, and shape can be rectangle, 103 position of decoupling item
Positioned at the centre of mimo antenna each column radiating element, as shown in figure 14.
The quantity of the decoupling item 103 is denoted as K, and the columns of radiating element 301 described in large scale array antenna is denoted as J,
Meet 0≤K≤J+1, selects the quantity of the decoupling item 103 in concrete application as needed.
The material of the medium substrate 101 is nonmetallic medium.The material for guiding piece 102 into is good conductance
Body, such as copper, aluminium, in practical applications, it is contemplated that the factors such as stability, feasibility and weight of structure generally use medium
The form of substrate double-sided copper-clad.The material of the decoupling item 103 is good electric conductor, such as copper, aluminium, in practical applications,
The factors such as stability, feasibility and weight in view of structure, the general form that copper is covered using medium substrate.
By taking second isolator 20 is isolation board as an example, second isolator 20 is described further.
As shown in figure 15, isolation board is located among the column and column of mimo antenna radiating element, and it is anti-to be fixed on the antenna
It penetrates on plate 302.
Rectangle, " city wall " etc. can be used in isolation board form, and as shown in figure 16, second isolator 20 is that isolation board is
City wall shape.It can be selected according to the actual situation in concrete application.
The material of second isolator 20 is good electric conductor, such as copper, aluminium either PCB double-sided copper-clad.
The length of the isolation board is between 0.2 λ -0.6 λ, and width is between 0.0117 λ -0.0467 λ.Plate thickness is isolated
Between 0.5mm-1.5mm, length is selected according to the distribution of practical structures.
The present invention also provides a kind of mimo antennas, including above-mentioned isolator, mimo antenna reflecting plate, periodic arrangement
Radiating element, first isolator is installed on right above radiating element, and second isolator is installed on adjacent two
Between column radiating element.
It can be seen that from Figure 17, Figure 18 and apply the present invention to large scale array antenna, antenna radiation unit can be improved
Between mutual coupling relationship, 10dB or more is promoted to isolation, while the pattern distortion that can be also effectively improved antenna element is asked
Topic improves antenna efficiency.
By optimize isolator relevant parameter can improve the mutual coupling relationship of mimo antenna, thus promoted mimo antenna every
From degree and improve pattern distortion.The size for reducing antenna under the premise of guaranteeing antenna performance can be widely applied to mobile logical
Believe the design of antenna for base station.
It should be noted last that the above specific embodiment is only used to illustrate the technical scheme of the present invention and not to limit it,
Although being described the invention in detail referring to example, those skilled in the art should understand that, it can be to the present invention
Technical solution be modified or replaced equivalently, without departing from the spirit and scope of the technical solution of the present invention, should all cover
In the scope of the claims of the present invention.
Claims (10)
1. a kind of isolator characterized by comprising the first isolator, first isolator are located at radiating element
The top of array, first isolator include medium substrate, guide piece, decoupling item into, and described to guide piece, the decoupling item into equal
It is arranged on the medium substrate, the surface guided piece into and be located at the radiating element, the decoupling item is located at two column spokes
It penetrates between unit.
2. isolator according to claim 1, which is characterized in that piece, the decoupling item of guiding into is in the medium
One of following distribution mode is distributed as on substrate:
It is described guide piece into, the decoupling item is respectively positioned on the bottom surface of the medium substrate;
It is described guide piece into, the decoupling item is respectively positioned on the top surface of the medium substrate;
The piece of guiding into is located on the bottom surface of the medium substrate, and the decoupling item is respectively positioned on the top surface of the medium substrate
On;
The piece of guiding into is located on the top surface of the medium substrate, and the decoupling item is respectively positioned on the bottom surface of the medium substrate
On.
3. isolator according to claim 1, which is characterized in that the thickness of the medium substrate is in 0.0058 λ-
Between 0.035 λ, the dielectric constant of the medium substrate is between 2.2-9.8, wherein λ is radiating element centre frequency in freedom
Corresponding wavelength when space propagation.
4. isolator according to claim 1, which is characterized in that the bottom surface of the medium substrate and the radiating element
The distance between radiating surface top surface between 3mm-8mm.
5. isolator according to claim 1, which is characterized in that the medium substrate is a monolith medium substrate, or
Medium substrate described in person is made of the medium substrate of several fritters.
6. any isolator in -5 according to claim 1, which is characterized in that it further include the second isolator, it is described
Second isolator is arranged on antenna-reflected plate, and between adjacent radiation unit.
7. isolator according to claim 6, which is characterized in that second isolator be isolation board, it is described every
It is made from plate using copper, aluminium or PCB double-sided copper-clad.
8. isolator according to claim 7, which is characterized in that the length of the isolation board between 0.2 λ -0.6 λ,
Width is between 0.0117 λ -0.0467 λ, and thickness is between 0.5mm-1.5mm, wherein λ is radiating element centre frequency certainly
Corresponding wavelength when by space propagation.
9. isolator according to claim 7, which is characterized in that the isolation board is rectangle or city wall shape.
10. a kind of mimo antenna, which is characterized in that including antenna-reflected plate, radiating element, such as institute any in claim 1-9
The isolator stated.
Priority Applications (2)
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CN201811031141.4A CN109149108A (en) | 2018-09-05 | 2018-09-05 | A kind of isolator and mimo antenna |
PCT/CN2018/121462 WO2020048042A1 (en) | 2018-09-05 | 2018-12-17 | Decoupling device and mimo antenna |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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CN201811031141.4A CN109149108A (en) | 2018-09-05 | 2018-09-05 | A kind of isolator and mimo antenna |
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CN201811031141.4A Pending CN109149108A (en) | 2018-09-05 | 2018-09-05 | A kind of isolator and mimo antenna |
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WO (1) | WO2020048042A1 (en) |
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CN110350312A (en) * | 2019-07-04 | 2019-10-18 | 北京理工大学 | A kind of 5G mobile terminal mimo antenna based on circuit decoupling |
CN111740221A (en) * | 2020-06-19 | 2020-10-02 | 中天通信技术有限公司 | Multiport base station antenna with decoupling device |
CN112164888A (en) * | 2020-08-21 | 2021-01-01 | 西安朗普达通信科技有限公司 | Method for improving coupling performance of multi-antenna system by decoupling wave-leading device |
WO2021000705A1 (en) * | 2019-06-30 | 2021-01-07 | Oppo广东移动通信有限公司 | Antenna apparatus and electronic device |
CN112563742A (en) * | 2020-12-03 | 2021-03-26 | 西安朗普达通信科技有限公司 | Novel broadband decoupling antenna housing |
CN112803146A (en) * | 2019-11-14 | 2021-05-14 | 惠州硕贝德无线科技股份有限公司 | Base station antenna with same-frequency mutual coupling effect reduction device |
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