CN117039429A - Super-surface decoupling structure, low-profile omnidirectional antenna array and wireless communication device - Google Patents
Super-surface decoupling structure, low-profile omnidirectional antenna array and wireless communication device Download PDFInfo
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- CN117039429A CN117039429A CN202310955663.8A CN202310955663A CN117039429A CN 117039429 A CN117039429 A CN 117039429A CN 202310955663 A CN202310955663 A CN 202310955663A CN 117039429 A CN117039429 A CN 117039429A
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- 238000004891 communication Methods 0.000 title claims abstract description 13
- 238000002955 isolation Methods 0.000 claims abstract description 44
- 239000000758 substrate Substances 0.000 claims abstract description 27
- 230000000737 periodic effect Effects 0.000 claims abstract description 7
- 230000005404 monopole Effects 0.000 claims description 23
- 125000006850 spacer group Chemical group 0.000 claims 1
- 230000005855 radiation Effects 0.000 abstract description 19
- 238000012545 processing Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 8
- 230000008878 coupling Effects 0.000 description 7
- 238000010168 coupling process Methods 0.000 description 7
- 238000005859 coupling reaction Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
- 238000005192 partition Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000001808 coupling effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction 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
- H01Q1/52—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
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0086—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials
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- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The invention discloses a super-surface decoupling structure, a low-profile omnidirectional antenna array and wireless communication equipment, wherein the super-surface decoupling structure comprises at least two layers of super-surface isolation walls, each layer of super-surface isolation wall comprises periodic resonance units and a dielectric substrate, the resonance units are U-shaped interdigital structures, and the resonance units are arranged on two sides of the dielectric substrate; the antenna array comprises an omnidirectional antenna unit and the above-mentioned super-surface decoupling structure, the omnidirectional antenna unit and the super-surface decoupling structure are arranged on a large floor, the number of the omnidirectional antenna units is at least two, the super-surface isolation wall is arranged between two adjacent omnidirectional antenna units, and the dielectric substrate is vertically arranged on the large floor. The invention can make the antenna array have the advantages of low section, omnidirectional radiation, directivity pattern roundness within 3dB and high isolation, and has simple structure and easy processing.
Description
Technical Field
The invention relates to a super-surface decoupling structure, a low-profile omnidirectional antenna array and wireless communication equipment, and belongs to the technical field of wireless communication.
Background
Meta-materials refer to a class of man-made materials that have special properties that are not found in natural materials. Metamaterials are artificially synthesized electromagnetic materials with periodic structures that can be obtained by altering the microstructure or macroscopic arrangement of the material, thereby achieving novel physical properties. Metamaterials can be roughly classified into three types, namely metamaterials with negative dielectric constants, metamaterials with negative magnetic permeability and double-negative materials, and are widely focused on the electromagnetic field due to the unique electromagnetic characteristics, easiness in processing and the like. For example, by using metamaterials to increase the impedance matching of the antennas, reduce the mutual coupling between the antennas, increase the gain of the antennas, etc.
With the rapid development of wireless communication technology, in modern communication systems, the channel capacity and transmission rate of antennas are receiving higher and higher attention and demands. The application of MIMO technology effectively improves the channel capacity and transmission efficiency of antennas, but at the same time, because of the miniaturization of modern communication systems, the spacing of MIMO antenna units is limited by a limited physical space. The smaller the space between the antenna units is, the stronger the mutual coupling effect between the antennas is, the strong coupling effect can destroy the radiation characteristics of the antennas and seriously affect the performance of the whole antenna array transceiver system, so that the reduction of the mutual coupling between the antenna units is a key for the development of wireless communication.
The current common method for improving the isolation degree of the antenna mainly comprises the following steps: firstly, the ground plane of the antenna is grooved (DGS), the principle of the method is that the grooves damage the ground plane by preventing the current between the antenna units from coupling through the ground, so that the original direction of the current of the antenna is changed, and the changed current flow direction and the original current flow direction can be mutually offset by designing the size and the shape direction of the grooves, so that the coupling between the antenna units is reduced. However, the DGS method can have a great influence on the radiation characteristics of the antenna, and if the antenna system is integrated with the circuit system, there may be a circuit in which energy leaks to the lower side through the slot, and unnecessary electromagnetic coupling is generated to the circuit; secondly, a decoupling network is added between a feed port and an antenna to improve the isolation of the antenna, the common decoupling network is a microwave network formed by a transmission line or other microwave structures, and signals coupled to adjacent antennas through the microwave network and signals coupled to a source path are mutually offset by selecting proper parameters, so that the isolation of the antenna is improved, but the design of the decoupling network is generally complex; thirdly, the isolation is improved by utilizing an electromagnetic structure, and a common classical electromagnetic band gap structure is mushroom-shaped EBG. By reasonably designing the size and shape of the electromagnetic band gap structure, the propagation of surface waves in a certain frequency band can be restrained, so that the coupling is reduced. However, the EBG structure requires a plurality of cycles, occupies a large area, and is therefore not suitable when the antenna element interval is small.
Disclosure of Invention
A first object of the present invention is to overcome the drawbacks and deficiencies of the prior art by providing a super-surface decoupling structure that enables an antenna array to have the advantages of low profile, omnidirectional radiation, directivity pattern roundness within 3dB, high isolation, and simple structure for easy processing.
A second object of the present invention is to provide a low profile omnidirectional antenna array comprising the above-mentioned super-surface decoupling structure.
It is a third object of the present invention to provide a wireless communication device comprising a low profile omnidirectional antenna array as described above.
The first object of the present invention can be achieved by adopting the following technical scheme:
the utility model provides a super surface decoupling structure, includes super surface isolation wall, super surface isolation wall is two-layer at least, and every layer of super surface isolation wall includes periodic resonance unit and dielectric substrate, resonance unit is U-shaped interdigital structure, and resonance unit sets up in dielectric substrate's both sides.
Furthermore, the super-surface isolation wall works in a specified frequency band by adjusting the gaps in the resonance units, the sizes of the resonance units, the number of the interdigital units, the arrangement angle difference of the resonance units on two sides of the dielectric substrate and the spacing between two adjacent layers of super-surface isolation walls.
Further, the resonance unit comprises a first unit structure and a second unit structure, and the first unit structure and the second unit structure are mutually nested to form a U-shaped interdigital structure.
Further, the super surface isolation wall is three layers.
Further, the arrangement angles of the resonant units at two sides of the dielectric substrate are set to be rotation angles of 0 degrees, 90 degrees or 180 degrees.
The second object of the invention can be achieved by adopting the following technical scheme:
the utility model provides a low profile qxcomm technology antenna array, includes qxcomm technology antenna unit and foretell super surface decoupling structure, qxcomm technology antenna unit and super surface decoupling structure set up on big floor, qxcomm technology antenna unit is two at least, super surface isolation wall sets up between two adjacent qxcomm technology antenna unit, dielectric substrate sets up on big floor perpendicularly.
Further, each omnidirectional antenna unit comprises a top disk, a matching short-circuit column and a monopole, one end of the matching short-circuit column is connected with the large floor, the other end of the matching short-circuit column is connected with the top disk, one end of the monopole penetrates through the large floor to be connected with the feed port, and the other end of the monopole is connected with the top disk.
Further, the monopole is a conical monopole.
Furthermore, the number of the matched short-circuit columns is two, and the two matched short-circuit columns are respectively positioned at two sides of the monopole.
The third object of the present invention can be achieved by adopting the following technical scheme:
a wireless communication device comprising the low profile omnidirectional antenna array described above.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a super-surface decoupling structure, which is provided with at least two layers of super-surface isolation walls, each layer of super-surface isolation wall comprises periodic resonant units and a dielectric substrate, the resonant units are of U-shaped interdigital structures, and the resonant units are arranged on two sides of the dielectric substrate, so that the antenna array has the advantages of high isolation degree, more miniaturized antenna unit size, capability of realizing omnidirectional radiation, keeping roundness within 3dB, more circular radiation pattern and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a three-dimensional perspective structural view of a low-profile omnidirectional antenna array according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view of a low-profile omni-directional antenna array according to an embodiment of the present invention.
Fig. 3 is a top view block diagram of a low profile omni-directional antenna array in accordance with an embodiment of the present invention.
Fig. 4 is a plan view of a super surface partition wall according to an embodiment of the present invention.
Fig. 5 is a perspective view of a three-layer super surface partition wall according to an embodiment of the present invention.
FIG. 6 is a side view block diagram of a three-layer super-surface partition wall according to an embodiment of the present invention.
Fig. 7 is a schematic illustration of a dimension of a resonant cell on one side of a dielectric substrate according to an embodiment of the present invention.
Fig. 8 is a schematic diagram of a resonant unit on the other side of the dielectric substrate according to an embodiment of the present invention.
Fig. 9 is a graph of S parameter for a non-super-surface partition wall according to an embodiment of the present invention.
FIG. 10 is a graph of S parameter for a partition wall with a super surface according to an embodiment of the present invention.
FIG. 11 is a graph showing the contrast of the radiation direction of the super surface isolation wall with or without the azimuth angle of 30 degrees according to the embodiment of the present invention.
FIG. 12 is a graph showing the contrast of the radiation direction of the super surface isolation wall with or without the azimuth angle of 45 degrees according to the embodiment of the present invention.
FIG. 13 is a graph showing the contrast of the radiation direction of the super surface isolation wall with or without the azimuth angle of 50 degrees according to the embodiment of the present invention.
FIG. 14 is a graph showing the contrast of the radiation direction of the super surface isolation wall with or without the azimuth angle of 60 degrees according to the embodiment of the present invention.
FIG. 15 is a graph showing the contrast of the radiation direction of the super surface isolation wall with or without the azimuth angle of 70 degrees according to the embodiment of the present invention.
FIG. 16 is a graph showing the contrast of radiation directions of a super surface isolation wall with or without an azimuth angle of 80 degrees according to an embodiment of the present invention.
Fig. 17 is a graph of permeability of a subsurface decoupling structure according to an embodiment of the present invention.
Fig. 18 is a graph of dielectric constant of a subsurface decoupling structure according to an embodiment of the present invention.
The high-voltage power supply comprises a 1-large floor, a 2-top disc, a 3-matched short-circuit column, a 4-monopole, a 5-dielectric substrate, a 6-resonance unit, a 6_1-first unit structure, a 6_2-second unit structure and a 7-feed port.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by persons of ordinary skill in the art without making any inventive effort based on the embodiments of the present invention are within the scope of protection of the present invention.
Examples:
as shown in fig. 1 to 3, the present embodiment provides a low-profile omni-directional antenna array which can be applied to various wireless communication devices, including an omni-directional antenna unit and a super-surface decoupling structure, which are provided on a large floor 1.
Further, the number of the omni-directional antenna units is two, each omni-directional antenna unit is a low-profile monopole omni-directional antenna unit, which comprises a top plate 2, a matching short-circuit column 3 and a monopole 4, one end of the matching short-circuit column 3 is connected with a large floor 1, the other end of the matching short-circuit column 3 is connected with the top plate 2, the two matching short-circuit columns 3 are respectively positioned at two sides of the monopole 4, one end of the monopole 4 is connected with a feed port 7 through the large floor 1, the feed port 7 is a coaxial feed line, the other end of the monopole 4 is connected with the top plate, the principle is that the antenna unit moves to a low frequency at a resonance point under the same height by loading the antenna form of the monopole 4 through the top plate 2, so that the height of the antenna unit is reduced, but the radiation resistance of the monopole 4 loaded by the top plate 2 is extremely low, and the antenna unit is not easy to match, so that the radiation resistance of the antenna unit is increased by adopting a folded structure (namely the matching short-circuit column 3) by utilizing a folded monopole principle; in particular, the monopole 4 is a conical monopole, which can widen the operating band of the antenna unit.
As shown in fig. 1 to 8, the super-surface isolation wall is three layers, and is arranged between two omnidirectional antenna units to play a decoupling role, each super-surface isolation wall comprises periodic resonant units 6 and a dielectric substrate 5, the dielectric substrate 5 can support the resonant units 6, the dielectric substrate 5 is vertically arranged on a large floor 1, the resonant units 6 are of a U-shaped interdigital structure, the resonant units 6 are arranged on two sides of the dielectric substrate 5, the arrangement angles of the resonant units on the two sides can be set to be 0 °, 90 ° or 180 ° rotation angles, decoupling requirements of different antenna systems are met, and in an embodiment, the arrangement angle difference of the resonant units on the two sides is 180 °.
Further, the resonance unit 6 may be split into a first unit structure 6_1 and a second unit structure 6_2, the thin portion in fig. 5 is the first unit structure 6_1, the thick portion is the second unit structure 6_2, and the first unit structure 6_1 and the second unit structure 6_2 may be disassembled into a U-shaped basic structure, so that the U-shaped structures are spliced together to form the first unit structure 6_1 and the second unit structure 6_2, and the first unit structure 6_1 and the second unit structure 6_2 are nested to form a U-shaped interdigital structure; the super-surface isolation wall works in a specified frequency band by adjusting parameters such as gaps (g 1/g 2) in the resonance units 6, the sizes of the resonance units, the number of the interdigital units, the arrangement angle difference of the resonance units 6 on two sides of the dielectric substrate 5, the distance (dw) between two adjacent layers of super-surface isolation walls and the like, so that decoupling effect is achieved in the specified frequency band, and the thickness, the dielectric constant and the like of the dielectric substrate 5 can be adjusted according to actual requirements, so that the actual size of the super-surface isolation wall better meets the actual size and decoupling requirements of antenna system design.
In the present embodiment, the total length×width×height of the large floor 1 is 180mm×180mm×0.1mm; the total length, width and height of the top plate 2 are 50mm, 10mm and 0.5mm; the radius of the short-circuit column 3 is 0.3mm, the length is 10mm, and the distance dshort between the short-circuit column and the monopole is 5mm; the conical monopole 4 has an upper radius of 2.17mm, a lower radius of 0.65mm and a height of 10mm of about 0.06 x lambda; the material of the dielectric substrate 5 was fr4_epoxy, the dielectric constant was 4.4, the tangent loss angle was 0.02, and the total length×width×height was 67mm×1.6mm×11.7mm; the individual cell dimensions of the resonant cells 6 are shown in fig. 7, where l=13.4 mm, w=11.7mm, l0=11.3mm, w0=1 mm, l1=8.8mm, w1=1 mm, l2=13 mm, w2=1 mm, g1=0.5 mm, g2=0.5 mm.
As shown in fig. 9 to 10, compared with S parameters of the super-surface isolation wall, it can be seen that the embodiment can effectively improve the isolation of the antenna unit, so that the S21 is reduced from-6 dB to-30 dB, and the isolation is effectively improved by approximately 25dB; as shown in fig. 11 to 16, comparing the radiation patterns of the super-surface isolation wall, it can be seen that the maximum gain of the antenna array is reduced within 2dB after the super-surface decoupling structure is used; but at the same time, the radiation pattern of the antenna array is smoother, so that the radiation intensity of the antenna array is more uniform; as shown in fig. 17 and 18, which are respectively a magnetic permeability curve and a dielectric constant curve of the super-surface decoupling structure, it can be seen that the dielectric constant and the magnetic permeability of the super-surface decoupling structure are both negative numbers, and it can be known from the classification of the metamaterial, the structure is a left-hand material with negative refraction characteristics; the negative refraction characteristic can amplify the withering wave, and can inhibit the transmission of the space wave in the field of antennas, so that the space wave coupling between antenna units in the antenna array can be effectively reduced, and the isolation between the antenna units is improved.
In summary, the invention provides the super-surface decoupling structure, which is provided with at least two layers of super-surface isolation walls, each layer of super-surface isolation wall comprises periodic resonant units and a dielectric substrate, the resonant units are of U-shaped interdigital structures, and the resonant units are arranged on two sides of the dielectric substrate, so that the antenna array has the advantages of high isolation degree, more miniaturized antenna unit size, capability of realizing omnidirectional radiation, keeping roundness within 3dB, more circular radiation pattern and the like.
The foregoing is only illustrative of the present invention, and the embodiments of the present invention are not limited to the above-described embodiments, but any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principles of the present invention should be made in the equivalent manner and are included in the scope of the present invention.
Claims (10)
1. The utility model provides a super surface decoupling structure, its characterized in that includes super surface isolation wall, super surface isolation wall is two-layer at least, and every layer of super surface isolation wall includes periodic resonance unit and dielectric substrate, resonance unit is U-shaped interdigital structure, and resonance unit sets up in dielectric substrate's both sides.
2. The super-surface decoupling structure according to claim 1, wherein the super-surface isolation wall is operated in a specified frequency band by adjusting a gap in the resonance unit, a size of the resonance unit, the number of the interdigital, an arrangement angle difference of the resonance units on both sides of the dielectric substrate, and a distance between two adjacent layers of the super-surface isolation wall.
3. The super-surface decoupling structure of claim 1, wherein the resonant cells comprise a first cell structure and a second cell structure, the first cell structure and the second cell structure being nested within each other to form a U-shaped interdigital structure.
4. A super-surface decoupling structure as claimed in any one of claims 1-3, wherein the super-surface spacer wall is three layers.
5. A super-surface decoupling structure as claimed in any one of claims 1-3, wherein the arrangement angle of the resonant cells on both sides of the dielectric substrate is set to a rotation angle of 0 °, 90 ° or 180 °.
6. A low profile omnidirectional antenna array comprising omnidirectional antenna units and a super-surface decoupling structure according to any one of claims 1-5, wherein the omnidirectional antenna units and the super-surface decoupling structure are disposed on a large floor, the number of omnidirectional antenna units is at least two, the super-surface isolation wall is disposed between two adjacent omnidirectional antenna units, and the dielectric substrate is vertically disposed on the large floor.
7. The low profile omnidirectional antenna array of claim 6, wherein each omnidirectional antenna unit includes a top plate, a matching shorting post, one end of the matching shorting post being connected to the large floor, the other end of the matching shorting post being connected to the top plate, one end of the monopole being connected to the feed port through the large floor, the other end of the monopole being connected to the top plate.
8. The low profile omnidirectional antenna array of claim 7, wherein the monopole is a conical monopole.
9. The low profile omnidirectional antenna array of claim 7, wherein the number of matching shorting posts is two, the two matching shorting posts being located on each side of the monopole.
10. A wireless communication device comprising the low profile omnidirectional antenna array of any one of claims 6 to 9.
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| CN202310955663.8A CN117039429A (en) | 2023-08-01 | 2023-08-01 | Super-surface decoupling structure, low-profile omnidirectional antenna array and wireless communication device |
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| CN202310955663.8A CN117039429A (en) | 2023-08-01 | 2023-08-01 | Super-surface decoupling structure, low-profile omnidirectional antenna array and wireless communication device |
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| CN110504541A (en) * | 2019-08-27 | 2019-11-26 | 南京邮电大学 | A kind of electromagnetism metamaterial structure for reducing the mimo antenna degree of coupling |
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| CN115064877A (en) * | 2022-06-10 | 2022-09-16 | 西安电子科技大学 | Decoupling super surface applied to dual-polarization compact base station antenna array |
| CN115693152A (en) * | 2022-12-30 | 2023-02-03 | 华南理工大学 | Antenna decoupling assembly and antenna |
| CN115966900A (en) * | 2022-12-02 | 2023-04-14 | 杭州电子科技大学 | Broadband high-isolation dual-frequency MIMO single-pole cone antenna array |
-
2023
- 2023-08-01 CN CN202310955663.8A patent/CN117039429A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110504541A (en) * | 2019-08-27 | 2019-11-26 | 南京邮电大学 | A kind of electromagnetism metamaterial structure for reducing the mimo antenna degree of coupling |
| CN112134017A (en) * | 2020-08-04 | 2020-12-25 | 中国航空工业集团公司沈阳飞机设计研究所 | Decoupling method between airborne array antenna oscillators based on metamaterial and metamaterial |
| CN112635993A (en) * | 2020-12-14 | 2021-04-09 | 重庆大学 | Dual-polarized broadband high-density base station array antenna with high isolation |
| CN113745837A (en) * | 2021-09-13 | 2021-12-03 | 重庆大学 | Omnidirectional, vertical polarization and electric small filtering antenna |
| CN115064877A (en) * | 2022-06-10 | 2022-09-16 | 西安电子科技大学 | Decoupling super surface applied to dual-polarization compact base station antenna array |
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