CN111555029A - Method for improving antenna array coupling performance by adopting flexible super-surface film - Google Patents
Method for improving antenna array coupling performance by adopting flexible super-surface film Download PDFInfo
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- CN111555029A CN111555029A CN202010418303.0A CN202010418303A CN111555029A CN 111555029 A CN111555029 A CN 111555029A CN 202010418303 A CN202010418303 A CN 202010418303A CN 111555029 A CN111555029 A CN 111555029A
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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
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Abstract
The invention discloses a method for improving antenna array coupling performance by adopting a flexible super-surface film, which comprises a flexible substrate and a periodic resonant unit layer on the upper surface of the flexible substrate; the lower surface of a flexible substrate of the flexible super-surface film is attached to the antenna support or the antenna cover through the back adhesive and covers the upper part of the linearly polarized antenna array or between every two antenna units. By adjusting the size of the resonant units, the distance between the resonant units and the distance between the cladding and the antenna array in the flexible super-surface film, the coupling between the units of the antenna array can be effectively reduced to be below-15 dB in a frequency band specified by a designer, and the radiation efficiency of the antenna unit is improved by more than 10%. The method for decoupling by adopting the flexible super-surface film is suitable for antenna arrays with any frequency band formed by any linearly polarized, dual-polarized and circularly polarized antenna units.
Description
Technical Field
The invention relates to the field of wireless communication, in particular to a method for improving antenna array coupling performance by adopting a flexible super-surface film.
Background
With the rapid development of mobile communication systems, radio frequency spectrum resources are increasingly in short supply, and how to provide higher-quality and faster communication services becomes a research hotspot in fifth-generation mobile communication systems (5G). In this context, a long-standing multiple-input multiple-output (MIMO) communication technology has been proposed as a key technology in 5G systems.
A Multiple Input Multiple Output (MIMO) technique refers to using a plurality of transmitting antennas and receiving antennas at a transmitting end and a receiving end simultaneously, so that signals are transmitted and received through the plurality of antennas of the transmitting end and the receiving end. Therefore, the mimo technology can realize high-speed and large-capacity data transmission without additionally increasing communication frequency band and transmission power, and significantly improve system data throughput and channel capacity. In multiple-input multiple-output (MIMO) systems, antennas play a crucial role because their characteristics are inherently included in the communication channel between the transmitter and the receiver.
MIMO technology is based on antenna arrays, with increasing demand for channel capacity, massive MIMO technology will become the core of 5G systems, and compact dense arrays will facilitate this process. However, in either a 5G base station or a mobile terminal, due to space constraints, as the number of antennas increases, the spacing between the antenna elements is relatively small, resulting in strong mutual coupling between the elements. The greater the number of antenna elements in a particular space, the stronger the coupling between the elements, which results in:
(1) an increase in spatial correlation;
(2) a decrease in radiation efficiency;
(3) a decrease in cell gain;
(4) degradation of signal-to-noise ratio;
(5) a reduction in channel capacity.
In summary, in a limited space, how to effectively reduce the coupling between antenna units in the MIMO system, improve the isolation between the units, and ensure the radiation performance of the original antenna has become a hot point of research in the industry.
Disclosure of Invention
The invention aims to: the method for improving the coupling performance of the antenna array by adopting the flexible super-surface film is provided, and under the conditions that the physical space is limited and the adjacent antenna units have strong mutual coupling, the flexible super-surface film is adopted to improve the coupling performance among the antenna array units, and the isolation among the units is improved.
The technical scheme of the invention is as follows:
a method for improving antenna array coupling performance by adopting a flexible super-surface film comprises a flexible substrate and a periodic resonant unit layer on the upper surface of the flexible substrate; the lower surface of a flexible substrate of the flexible super-surface film is attached to the antenna support or the antenna cover through the back adhesive and covers the upper part of the linearly polarized antenna array or between every two antenna units.
Preferably, the coupling among the units of the linear polarization antenna array containing the flexible super-surface film is reduced and the isolation is improved by adjusting the size of the resonance units of the periodic resonance unit layer, the distance between the resonance units and the height of the periodic resonance unit layer relative to the array antenna;
preferably, the gain of the linear polarization antenna array containing the flexible super-surface film is improved, the bandwidth is improved, and the radiation efficiency is increased by adjusting the size of the resonant units of the periodic resonant unit layer, the distance between the resonant units and the height of the periodic resonant unit layer relative to the array antenna.
Preferably, the periodic resonant unit layer on the flexible super-surface film adopts different forms of resonant units according to the actual antenna system requirements.
Preferably, the flexible super-surface film adopts a multilayer structure, and the multilayer flexible super-surface film is respectively attached to the inner surface, the outer surface or the middle interlayer of the antenna housing or the antenna support.
Preferably, the coupling among the units of the linear polarization antenna area array containing the flexible super-surface film is reduced and the isolation is improved by adjusting the respective resonance unit size, the resonance unit interval, the height of the first periodic resonance unit layer relative to the array antenna and the heights of other periodic resonance unit layers relative to the first periodic resonance unit layer of each layer of the flexible super-surface film;
preferably, the gain of the linear polarization antenna area array containing the super-surface coating is improved and the radiation efficiency is increased by adjusting the respective resonance unit size, the resonance unit interval, the height of the first periodic resonance unit layer relative to the array antenna and the heights of other periodic resonance unit layers relative to the first periodic resonance unit layer of each layer of the flexible super-surface film.
Preferably, the periodic resonant unit layers in the flexible super-surface film can adopt resonant units in different forms or the same form in the flexible super-surface films of different layers so as to adapt to the requirements of an actual antenna system.
The invention has the advantages that:
the method for improving the coupling performance of the antenna array by adopting the flexible super-surface film is characterized in that under the conditions that the physical space is limited and strong mutual coupling exists between adjacent antenna units, the flexible super-surface film is attached to the antenna support or the antenna cover and covers the upper part of the linearly polarized antenna array or between every two antenna units, and the coupling performance between the array antenna units is improved, the isolation between the units is improved, the gain and the radiation efficiency are improved by adjusting the size of the resonance units, the distance between the resonance units and the height of the periodic resonance unit layer relative to the array antenna.
Drawings
The invention is further described with reference to the following figures and examples:
FIG. 1 is a diagram of a flexible super surface film of the present invention;
FIG. 2 is a structural diagram of a periodic resonant unit in the flexible super-surface film according to the present invention;
FIG. 3 is a schematic view of a super-surface film layer of the present invention positioned directly above two antenna elements;
FIG. 4 is a schematic view of a super-surface film layer of the present invention disposed between two antenna elements;
fig. 5 is a diagram of S11, S12 parameters of an original linear array MIMO antenna composed of two antenna units in an implementation example;
fig. 6 is a diagram of parameters S11 and S12 of a two-antenna element linear array MIMO antenna loaded with a single-layer flexible super-surface covering in an implementation example.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The details are as follows:
as shown in fig. 1, the flexible super-surface film structure of the present embodiment includes six layers from top to bottom: the printing ink layer 1, periodic resonance unit layer 2, AD glue 3, flexible substrate 4, gum 5 and from type paper 6.
The ink of the ink layer 1 is green, black and the like, mainly plays a role of covering the surface to resist oxidation, has the thickness of 0.015mm, and can ensure that the structure of the ink disclosed by the invention is exposed in the air for a long time and is not oxidized.
The periodic resonant unit layer 2 is arranged on the second layer of the film, has the thickness of 0.018mm, is generally engraved into a certain shape by electrolytic copper or rolled copper, and is adhered to the base material through AD glue 3. The periodic resonant structure unit can adopt different forms to adapt to the requirements of an actual antenna system, and can adopt a split resonant ring, a metal short wire and the like, as shown in fig. 2, a split resonant ring 21 is adopted on the periodic resonant unit layer 2. When the periodic resonant unit structure is selected, the periodic resonant unit structure is made to resonate in a desired frequency band according to an actual antenna system form.
The flexible substrate 4 is made of polyimide, the thickness of the flexible substrate is usually 0.0125mm, and the flexible substrate has a bearing effect on electrolytic copper. And has certain flexibility. The lamination is easy. From type paper 6 main guard action, directly tear when actually laminating, paste on antenna boom or antenna housing through gum 5.
Fig. 3 is a linear array MIMO antenna system composed of two linearly polarized antenna units loaded with a layer of flexible super-surface film. The antenna comprises a first linear polarization antenna unit 11 and a first linear polarization antenna unit 12 which are close to each other, wherein a super-surface film 10 is loaded above the two antenna units, and a flexible film is attached to an antenna cover. The antenna can be attached to the inner surface or the outer surface, or an intermediate layer of the antenna housing. Can be decided according to the actual engineering requirements. Because the film of the invention is provided with the back adhesive. Can be well attached to the surface of an object.
Through adjusting resonance unit size, resonance unit interval and array antenna's in the super surface film structure of flexibility height for:
(1) the coupling coefficient between the units of the antenna system loaded with the flexible super-surface film is close to 0, and S21 is smaller than-15 dB;
(2) the gain of each antenna unit of the antenna system loaded with the flexible super-surface film is improved compared with the gain of each antenna unit of the antenna system not loaded with the flexible super-surface film.
The method for improving the coupling performance is not only limited to two antenna unit linear arrays, but also is applicable to three or more antenna unit linear arrays, and the flexible super-surface film can be placed between the two antenna units. As shown in fig. 4.
Fig. 5 shows typical scattering parameters of a linear MIMO antenna system composed of two antenna elements without loading a flexible super-surface film, and it can be seen that although the reflection coefficient S11 of the antenna is less than-15 dB in a desired frequency band, the coupling coefficient between the two elements is close to-10 dB in both desired frequency bands. And after loading the flexible super-surface film, the coupling coefficient between the two antennas is reduced to less than-25 dB in both desired frequency bands, as shown in fig. 6.
The method for improving the coupling performance can be well applied to the MIMO communication system.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All modifications made according to the spirit of the main technical scheme of the invention are covered in the protection scope of the invention.
Claims (8)
1. A method for improving antenna array coupling performance by adopting a flexible super-surface film is characterized in that the flexible super-surface film comprises a flexible substrate and a periodic resonant unit layer on the upper surface of the flexible substrate;
the method comprises the following steps: the lower surface of a flexible substrate of the flexible super-surface film is attached to the antenna support or the antenna cover through the back adhesive and covers the upper part of the linearly polarized antenna array or between every two antenna units.
2. The method for improving antenna array coupling performance using a flexible super surface film according to claim 1, further comprising:
by adjusting the size of the resonant units of the periodic resonant unit layer, the distance between the resonant units and the height of the periodic resonant unit layer relative to the array antenna, the coupling among the units of the linear polarization antenna linear array containing the flexible super-surface film is reduced, and the isolation is improved.
3. The method for improving antenna array coupling performance using a flexible super surface film according to claim 1, further comprising:
by adjusting the size of the resonant units of the periodic resonant unit layer, the distance between the resonant units and the height of the periodic resonant unit layer relative to the array antenna, the gain of the linear polarization antenna array containing the flexible super-surface film is improved, the bandwidth is improved, and the radiation efficiency is increased.
4. The method of claim 1 for improving antenna array coupling performance using a flexible super-surface film,
the periodic resonant unit layers on the flexible super-surface film adopt resonant units in different forms according to the requirements of an actual antenna system.
5. The flexible super surface film according to any one of claims 1 to 4, wherein:
the flexible super-surface film adopts a multilayer structure, and the multilayer flexible super-surface film is respectively attached to the inner surface, the outer surface or the middle interlayer of the antenna housing or the antenna support.
6. The method of claim 5 for improving antenna array coupling performance using a flexible super-surface film, wherein:
by adjusting the respective resonance unit size, the resonance unit interval, the height of the first periodic resonance unit layer relative to the array antenna and the heights of other periodic resonance unit layers relative to the first periodic resonance unit layer of each layer of flexible super-surface film, the coupling among the units of the linear polarization antenna area array containing the flexible super-surface film is reduced, and the isolation is improved.
7. The method of claim 5 for improving antenna array coupling performance using a flexible super-surface film, wherein:
by adjusting the respective resonance unit size, the resonance unit interval, the height of the first periodic resonance unit layer relative to the array antenna and the heights of other periodic resonance unit layers relative to the first periodic resonance unit layer of each layer of flexible super-surface film, the gain of the linear polarization antenna area array containing the super-surface coating is improved, and the radiation efficiency is increased.
8. The method for improving the coupling performance of the linearly polarized antenna array by using the flexible super-surface film according to claim 6 or 7, wherein:
the periodic resonant unit layers in the flexible super-surface film can adopt resonant units in different forms or the same form in the flexible super-surface films of different layers so as to adapt to the requirements of an actual antenna system.
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Cited By (3)
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| CN113410602A (en) * | 2021-06-17 | 2021-09-17 | 东南大学 | Cascade split ring resonator for inhibiting coupling between broadband dual-polarized base station antennas |
| CN113517560A (en) * | 2021-03-25 | 2021-10-19 | 西安电子科技大学 | Wide-angle scanning millimeter wave array antenna |
| CN116666949A (en) * | 2023-06-07 | 2023-08-29 | 广东工业大学 | Resonant body coupling enhanced photoconductive antenna |
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Cited By (5)
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| CN113517560A (en) * | 2021-03-25 | 2021-10-19 | 西安电子科技大学 | Wide-angle scanning millimeter wave array antenna |
| CN113517560B (en) * | 2021-03-25 | 2023-05-23 | 西安电子科技大学 | Millimeter wave array antenna capable of scanning at wide angle |
| CN113410602A (en) * | 2021-06-17 | 2021-09-17 | 东南大学 | Cascade split ring resonator for inhibiting coupling between broadband dual-polarized base station antennas |
| CN116666949A (en) * | 2023-06-07 | 2023-08-29 | 广东工业大学 | Resonant body coupling enhanced photoconductive antenna |
| CN116666949B (en) * | 2023-06-07 | 2024-05-28 | 广东工业大学 | Resonant body coupling enhanced photoconductive antenna |
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