CN112186339B - Broadband circularly polarized magnetoelectric dipole antenna - Google Patents
Broadband circularly polarized magnetoelectric dipole antenna Download PDFInfo
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- CN112186339B CN112186339B CN202011049799.5A CN202011049799A CN112186339B CN 112186339 B CN112186339 B CN 112186339B CN 202011049799 A CN202011049799 A CN 202011049799A CN 112186339 B CN112186339 B CN 112186339B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
Abstract
The application discloses wide band circular polarization magnetoelectric dipole antenna through setting up the parasitic ring of metal, under the prerequisite that does not change the antenna major structure, promotes the circular polarization bandwidth of antenna by a wide margin. Meanwhile, the broadband circularly polarized magnetoelectric dipole antenna adopts a gap coupling feeding method, a metal feeding strip on the lower surface of a dielectric substrate is adopted to couple a coupling signal to a horizontal metal patch and a vertical metal patch above a metal floor through a rectangular groove, and a metal parasitic ring is arranged around a metal patch module to introduce a new circularly polarized resonant mode for the magnetoelectric dipole antenna, so that the antenna has better circularly polarized characteristics in the broadband working bandwidth. In addition, the structure of the antenna is not affected by the structural arrangement of the metal parasitic ring, and on the premise of maintaining the broadband circular polarization bandwidth, the gain in the working frequency band floats less, so that the broadband gain bandwidth and the better flat gain are achieved.
Description
Technical Field
The application relates to the technical field of microwave radio frequency, in particular to a broadband circularly polarized magnetoelectric dipole antenna.
Background
With the rapid development of wireless communication technology, the requirement for broadband antennas is higher and higher. Magnetoelectric dipole antennas, which have a wide bandwidth, low back radiation, and a stable radiation pattern, have gained widespread attention in recent years. At present, the magneto-electric dipole antenna is widely applied to a 5G communication system, a base station communication system and a wireless local area network.
The traditional magnetoelectric dipole antenna mainly radiates polarized waves, and can not radiate circularly polarized waves, but the circularly polarized antenna can receive incoming waves in any direction, and meanwhile, the problem of polarization mismatching caused by multipath interference can be avoided. In order to enable the magnetoelectric dipole antenna to obtain circular polarization performance, a method of adding a connecting strip between horizontal dipoles can be adopted, but a good circular polarization characteristic cannot be obtained in a wide frequency band range.
Meanwhile, the gain bandwidth of the conventional circularly polarized antenna is narrow, the gain fluctuation is large in the working frequency band, and the gain flatness is poor.
Therefore, it is of great significance to design a magnetoelectric dipole antenna which has a simple structure, a wide axial ratio bandwidth and a wide gain bandwidth, and can obtain a good circular polarization characteristic so as to meet the requirement of a broadband wireless communication system.
Disclosure of Invention
The application provides a broadband circular polarization magnetoelectric dipole antenna which is used for solving the technical problems that the existing magnetoelectric dipole antenna is complex in structure, poor in circular polarization characteristic, narrow in gain bandwidth and poor in gain flatness.
In view of the above, the present application provides a broadband circularly polarized magnetic-electric dipole antenna, including: a dielectric substrate;
a metal floor is arranged on the upper surface of the dielectric substrate;
a metal parasitic ring is arranged above the metal floor, metal columns are arranged at four corners of the metal parasitic ring, and the metal parasitic ring is in short circuit connection with the metal floor through the metal columns;
the metal parasitic ring is internally provided with four metal patch modules, the four metal patch modules are arranged in two rows and two columns, each metal patch module comprises a horizontal metal patch and a vertical metal patch, the horizontal metal patches are in short-circuit connection with the metal floor through the vertical metal patches, and any two horizontal metal patches arranged diagonally are connected through the metal connecting strip;
a rectangular groove is formed in the metal floor between two rows of metal patch modules or two rows of metal patch modules;
The lower surface of the medium substrate is printed with a metal feed strip, the metal feed strip is coupled and connected with the metal patch module through the rectangular groove, and the metal feed strip is provided with a feed port.
Preferably, the rectangular slot has a length of 38mm and a width of 1.5 mm.
Preferably, the metal parasitic ring coincides with a height of the horizontal metal patch.
Preferably, the metal feed strip is arranged between the two rows of metal patch modules or between the two rows of metal patch modules, and the metal feed strip is orthogonal to the length direction of the rectangular groove.
Preferably, the connection point of the horizontal metal patch and the vertical metal patch is arranged at one end far away from the metal parasitic ring.
Preferably, the number of the vertical metal patches is eight, every two vertical metal patches are connected with the horizontal metal patch, and a gap is formed between every two vertical metal patches.
Preferably, the feed port is externally connected with an SMA connector.
Preferably, four corners of the inner ring of the metal parasitic ring are provided with bevel edges, and the length of the bevel edge arranged at any one diagonal is greater than that of the bevel edge arranged at the other diagonal.
Preferably, the inner ring of the metal parasitic ring is a polygonal structure.
Preferably, the outer ring of the metal parasitic ring has a rectangular structure.
According to the technical scheme, the embodiment of the application has the following advantages:
the application provides a pair of wide band circular polarization magnetoelectric dipole antenna, simple structure, reasonable in design through setting up the parasitic ring of metal, under the prerequisite that does not change antenna major structure, promotes the circular polarization bandwidth of antenna by a wide margin. Meanwhile, the broadband circularly polarized magnetoelectric dipole antenna adopts a gap coupling feeding method, a metal feeding strip on the lower surface of a dielectric substrate is adopted to couple a coupling signal to a horizontal metal patch and a vertical metal patch above a metal floor through a rectangular groove, a metal parasitic ring is arranged around a metal patch module to introduce a new circularly polarized resonant mode for the magnetoelectric dipole antenna, and the circularly polarized bandwidth is improved to 44.7% from 12.4%, so that the antenna has a better circularly polarized characteristic in the broadband working bandwidth. In addition, the structure of the antenna is not affected by the structural arrangement of the metal parasitic ring, and on the premise of maintaining the broadband circular polarization bandwidth, the gain fluctuation in the working frequency band is small, the 1-dB gain bandwidth reaches 49.5%, the gain variation value is less than 1dB in the frequency band range of 3.62-5.55GHz, and the broadband gain bandwidth and the better flat gain are realized.
Drawings
Fig. 1 is a schematic perspective view of a broadband circular polarization magnetoelectric dipole antenna according to an embodiment of the present disclosure;
fig. 2 is a schematic side view of a wideband circularly polarized magnetic-electric dipole antenna according to an embodiment of the present disclosure;
fig. 3 is a comparison graph of axial ratio of a broadband circularly polarized magnetoelectric dipole antenna provided in the embodiment of the present application with frequency variation;
fig. 4 is a graph of S parameter variation with frequency of a wideband circularly polarized magnetoelectric dipole antenna according to an embodiment of the present application;
fig. 5 is a graph of axial ratio of a broadband circularly polarized magnetoelectric dipole antenna according to an embodiment of the present application along with a frequency variation;
fig. 6 is a graph illustrating a variation of gain with frequency of a wideband circularly polarized magnetic-electric dipole antenna according to an embodiment of the present disclosure;
fig. 7 is an XOZ plane radiation pattern of a broadband circularly polarized magnetoelectric dipole antenna provided in an embodiment of the present application at 3.7 GHz;
fig. 8 is an XOZ plane radiation pattern of a broadband circularly polarized magnetoelectric dipole antenna provided in an embodiment of the present application at 4.5 GHz;
fig. 9 is an XOZ plane radiation pattern of a broadband circularly polarized magnetoelectric dipole antenna provided in an embodiment of the present application at 5.3 GHz;
fig. 10 is a YOZ plane radiation pattern of a broadband circularly polarized magnetoelectric dipole antenna provided in an embodiment of the present application at 3.7 GHz;
Fig. 11 is a YOZ plane radiation pattern of the broadband circularly polarized magnetoelectric dipole antenna provided in the embodiment of the present application at 4.5 GHz;
fig. 12 is a YOZ plane radiation pattern of the broadband circularly polarized magnetoelectric dipole antenna provided in the embodiment of the present application at 5.3 GHz.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
For easy understanding, please refer to fig. 1 to 2, the present application provides a broadband circular polarization magnetic-electric dipole antenna, including: a dielectric substrate 1;
the upper surface of the medium substrate 1 is provided with a metal floor 2;
a metal parasitic ring 30 is arranged above the metal floor 2, metal columns 31 are arranged at four corners of the metal parasitic ring 30, and the metal parasitic ring 30 is in short circuit connection with the metal floor 2 through the metal columns 31;
The metal parasitic ring 30 is internally provided with four metal patch modules, the four metal patch modules are arranged in two rows and two columns, each metal patch module comprises a horizontal metal patch 40 and a vertical metal patch 41, the horizontal metal patches 40 are in short-circuit connection with the metal floor 2 through the vertical metal patches 41, and any two diagonal horizontal metal patches 40 are connected through a metal connecting strip 42;
a rectangular groove 5 is formed in the metal floor 2 between two rows of metal patch modules or two rows of metal patch modules;
the lower surface of the dielectric substrate 1 is printed with a metal feeding strip 60, the metal feeding strip 60 is coupled with the metal patch module through the rectangular slot 5, and the metal feeding strip 60 is provided with a feeding port 61.
It should be noted that the working principle of this embodiment is that a feeding signal is input from the outside through the feeding port 61, and the feeding signal is coupled to the metal patch module through the rectangular slot 5 after passing through the metal feeding strip 60, thereby completing feeding.
In this embodiment, simple structure, reasonable in design through setting up parasitic metal ring 30, under the prerequisite that does not change the antenna major structure, promotes the circular polarization bandwidth of antenna by a wide margin. Meanwhile, the antenna adopts a gap coupling feeding method, namely, energy is coupled to the horizontal metal patch 40 and the vertical metal patch 41 above the metal floor 2 through the rectangular groove 5 through the metal feeding strip 60 on the lower surface of the dielectric substrate 1, and the metal parasitic ring 30 is set as a magnetoelectric dipole antenna to introduce a new circularly polarized resonant mode, so that the antenna has a good circularly polarized characteristic in the broadband working bandwidth. In addition, the parasitic metal ring 30 adopted by the antenna does not affect the structure of the antenna, and has small gain floating in the working frequency band on the premise of maintaining the broadband circular polarization bandwidth, thereby having broadband gain bandwidth and better flat gain.
The above is an embodiment of a wideband circularly polarized magnetoelectric dipole antenna provided by the present application, and the following is another embodiment of a wideband circularly polarized magnetoelectric dipole antenna provided by the present application.
For easy understanding, please refer to fig. 1 to 2, the present application provides a broadband circular polarization magnetic-electric dipole antenna, including: a dielectric substrate 1;
the upper surface of the medium substrate 1 is provided with a metal floor 2;
a metal parasitic ring 30 is arranged above the metal floor 2, metal columns 31 are arranged at four corners of the metal parasitic ring 30, and the metal parasitic ring 30 is in short circuit connection with the metal floor 2 through the metal columns 31;
the metal parasitic ring 30 is internally provided with four metal patch modules, the four metal patch modules are arranged in two rows and two columns, each metal patch module comprises a horizontal metal patch 40 and a vertical metal patch 41, the horizontal metal patches 40 are in short-circuit connection with the metal floor 2 through the vertical metal patches 41, and any two diagonal horizontal metal patches 40 are connected through a metal connecting strip 42;
a rectangular groove 5 is formed in the metal floor 2 between two rows of metal patch modules or two rows of metal patch modules;
the lower surface of the dielectric substrate 1 is printed with a metal feeding strip 60, the metal feeding strip 60 is coupled with the metal patch module through the rectangular slot 5, and the metal feeding strip 60 is provided with a feeding port 61.
Further, the dielectric substrate 1 was an F4B substrate having a dielectric constant of 2.2 and a thickness of 1.5 mm.
Further, the metal floor 2, the metal parasitic ring 30 and the metal feeding strip 60 are made of copper.
Further, the rectangular groove 5 has a length of 38mm and a width of 1.5 mm.
Further, the metal parasitic ring 30 is formed to have a height corresponding to that of the horizontal metal patch 40.
In the present embodiment, the height of the metal parasitic ring 30 and the horizontal metal patch 40 is 18 mm.
Further, the metal feeding strip 60 is disposed between two rows of metal patch modules or two rows of metal patch modules, and the metal feeding strip 60 is orthogonal to the length direction of the rectangular slot 5.
It will be appreciated that the metallic feed strip 60, orthogonal to the length of the rectangular slot 5, improves the coupling strength.
Further, the connection point of the horizontal metal patch 40 and the vertical metal patch 41 is disposed at one end far from the metal parasitic ring 30.
In this embodiment, the connection between the horizontal metal patch 40 and the vertical metal patch 41 is centrosymmetric.
Further, eight vertical metal patches 41 are provided, every two vertical metal patches 41 are connected with the horizontal metal patch 40, and a gap is provided between the two vertical metal patches 41.
Further, an SMA connector is connected to the outside of the feed port 61.
Furthermore, four corners of the inner ring of the metal parasitic ring 30 are provided with bevel edges, and the length of the bevel edge arranged at any one diagonal is greater than that of the bevel edge arranged at the other diagonal.
It should be noted that, by setting the asymmetry of the oblique sides of the four corners of the inner ring of the metal parasitic ring 30, the circular polarization bandwidth can be increased to at least 44.7%, so that the antenna has a good circular polarization characteristic in the broadband operating bandwidth.
Further, the inner ring of the metal parasitic ring 30 has a polygonal structure.
Further, the outer ring of the parasitic metal ring 30 has a rectangular structure.
The present embodiment is further explained by the simulation result.
As shown in fig. 3, it shows a comparison graph of axial ratio parameters of the magnetic-electric dipole antenna with broadband circular polarization characteristic proposed by the present application with and without the metal parasitic ring varying with frequency.
When the horizontal metal patches arranged diagonally are connected through the metal connecting strips, the antenna generates a minimum axial ratio point at 3.6 GHz. As can be seen from fig. 3, when the metal parasitic ring is not provided, the frequency range of the antenna axial ratio lower than 3dB is 3.49-3.95GHz, and therefore, the bandwidth of the 3dB axial ratio at this time is 12.4%; after the metal parasitic ring is arranged, the antenna generates extra minimum axial ratio points at the frequencies of 4.5GHz and 5.3GHz, at the moment, the frequency range of the axial ratio smaller than 3dB is 3.49-5.5GHz, at the moment, the 3dB axial ratio bandwidth is 44.7%, and the antenna generates two minimum axial ratio points at 4.5GHz and 5.3GHz respectively, so that the 3dB axial ratio bandwidth is improved from 12.4% to 44.7% after the metal parasitic ring is arranged, and the structure and the size of the original antenna are not changed.
Fig. 4 is a graph of S-parameters as a function of frequency for the antenna measurements proposed by the present application. As can be seen from fig. 4, the frequency range of the antenna | S11| less than-10 dB is 3.4-6.0GHz, i.e. the impedance bandwidth of the antenna is 3.4-6.0GHz, the relative bandwidth is 55.3%, and the antenna covers a wide wireless communication frequency band range.
Fig. 5 is a graph of axial ratio versus frequency for the antenna measurements proposed in the present application. As can be seen from FIG. 5, the frequency range of the antenna axial ratio lower than 3dB is 3.62-5.55GHz, i.e. the axial ratio bandwidth of the antenna is 3.62-5.55GHz, the relative bandwidth is 42.1%, and the measurement result is substantially consistent with the simulation result.
Fig. 6 is a graph of gain versus frequency for the antenna measurements proposed in the present application. As can be seen from fig. 6, the maximum gain measured by the antenna is 9.2dBi, the frequency range of the 1dB gain bandwidth, i.e., the gain greater than 8.2dBi, is 3.5-5.8GHz, the relative bandwidth is 49.5%, and in the working frequency band of 3.62-5.55GHz, the minimum gain value is 8.2dBi, and the maximum gain value is 9.2dBi, so that the gain variation value is less than 1dB, which indicates that the antenna has a flat antenna gain in the working frequency band.
Fig. 7, 8 and 9 are the patterns of the antenna in the XOZ plane at 3.7GHz, 4.5GHz and 5.3GHz, respectively, according to the present application. Fig. 10, 11 and 12 are the patterns of the antenna in the YOZ plane at 3.7GHz, 4.5GHz and 5.3GHz, respectively, according to the present application. As can be seen from fig. 7 to 12, in the maximum radiation direction of 0 degree, the right-hand circularly polarized components are respectively-18 dBi, -19dBi, -25dBi, -26dBi, -20dBi and-21 dBi, so that the left-hand circularly polarized component 0dBi is at least 18dB larger than the right-hand circularly polarized component, and the direction diagram is relatively stable in the whole operating frequency band, which indicates that the antenna provided by the present application has good radiation stability.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
Claims (6)
1. A broadband circularly polarized magnetoelectric dipole antenna, comprising: a dielectric substrate;
a metal floor is arranged on the upper surface of the dielectric substrate;
a metal parasitic ring is arranged above the metal floor, metal columns are arranged at four corners of the metal parasitic ring, and the metal parasitic ring is in short circuit connection with the metal floor through the metal columns;
the metal parasitic ring is internally provided with four metal patch modules, the four metal patch modules are arranged in two rows and two columns, each metal patch module comprises a horizontal metal patch and a vertical metal patch, the horizontal metal patches are in short-circuit connection with the metal floor through the vertical metal patches, and any two horizontal metal patches arranged diagonally are connected through the metal connecting strip;
a rectangular groove is formed in the metal floor between two rows of metal patch modules or two rows of metal patch modules;
a metal feed strip is printed on the lower surface of the dielectric substrate, the metal feed strip is coupled and connected with the metal patch module through the rectangular groove, and the metal feed strip is provided with a feed port;
the height of the metal parasitic ring is consistent with that of the horizontal metal patch; the connection part of the horizontal metal patch and the vertical metal patch is arranged at one end far away from the metal parasitic ring; the inner ring of the metal parasitic ring is of a polygonal structure; the outer ring of the metal parasitic ring is of a rectangular structure.
2. The broadband circularly polarized magnetoelectric dipole antenna according to claim 1, wherein the rectangular slot has a length of 38mm and a width of 1.5 mm.
3. The broadband circularly polarized magnetoelectric dipole antenna according to claim 1, wherein the metal feed strip is disposed between the two rows or columns of metal patch modules, and the metal feed strip is orthogonal to the length direction of the rectangular slot.
4. The broadband circularly polarized magnetoelectric dipole antenna according to claim 1, wherein the number of the vertical metal patches is eight, every two vertical metal patches are connected to the horizontal metal patch, and a gap is formed between the two vertical metal patches.
5. The broadband circularly polarized magnetoelectric dipole antenna according to claim 1, wherein an SMA connector is connected to an exterior of the feed port.
6. The broadband circularly polarized magnetoelectric dipole antenna according to claim 1, wherein four corners of the inner ring of the metal parasitic ring are provided with oblique sides, and the length of the oblique side arranged at any one diagonal is greater than that of the oblique side arranged at the other diagonal.
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| CN202011049799.5A CN112186339B (en) | 2020-09-29 | 2020-09-29 | Broadband circularly polarized magnetoelectric dipole antenna |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113036411A (en) * | 2021-03-04 | 2021-06-25 | 东南大学 | Broadband circularly polarized reflective array antenna unit |
| CN113472460B (en) * | 2021-05-26 | 2022-11-01 | 中汽研汽车检验中心（天津）有限公司 | Method for testing receiving performance of whole-vehicle-level FM antenna |
| CN113258281B (en) * | 2021-05-31 | 2021-09-17 | 成都天锐星通科技有限公司 | Magnetoelectric dipole antenna structure and antenna array |
| CN115133286B (en) * | 2022-06-29 | 2023-07-11 | 东莞理工学院 | Magneto-electric dipole antenna with linear polarization and circular polarization function switching function and communication equipment |
| CN115832706B (en) * | 2022-12-16 | 2023-08-25 | 曲阜师范大学 | Miniaturized broadband circularly polarized magnetic electric dipole antenna |
| CN116470275B (en) * | 2023-05-31 | 2023-08-18 | 广东工业大学 | Dual-broadband circularly polarized large-frequency-ratio common-caliber antenna array |
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| CN110544819A (en) * | 2019-08-16 | 2019-12-06 | 西安电子科技大学 | broadband circularly polarized cross magnetoelectric dipole antenna |
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