CN107910648B - Low-profile dual-band omnidirectional circularly polarized antenna - Google Patents
Low-profile dual-band omnidirectional circularly polarized antenna Download PDFInfo
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- CN107910648B CN107910648B CN201711058891.6A CN201711058891A CN107910648B CN 107910648 B CN107910648 B CN 107910648B CN 201711058891 A CN201711058891 A CN 201711058891A CN 107910648 B CN107910648 B CN 107910648B
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- circularly polarized
- polarized antenna
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/10—Resonant antennas
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- 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
- H01Q15/24—Polarising devices; Polarisation filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
Abstract
The invention relates to an omnidirectional circularly polarized antenna, in particular to a low-profile dual-band omnidirectional circularly polarized antenna. The omnidirectional circularly polarized antenna mainly solves the technical problems that the existing omnidirectional circularly polarized antenna is large in size and cannot realize omnidirectional circularly polarized on a dual-band multi-azimuth plane. The invention is realized by the following technical scheme: a low profile dual band omni-directional circularly polarized antenna, wherein: the low-profile dual-band omnidirectional circularly polarized antenna consists of a dielectric substrate, a radiation patch and a ground plate, wherein the radiation patch and the ground plate are respectively attached to the upper surface and the lower surface of the dielectric substrate; coaxial feed holes are arranged at the corresponding positions of the centers of the dielectric substrate, the radiation patch and the grounding plate; the radiation patch is composed of a circular radiator and six microstrip lines, and the ground plate is composed of six metal strips. The omnidirectional circularly polarized antenna is reasonable in structure, effectively solves the technical problem that the existing omnidirectional circularly polarized antenna cannot realize omnidirectional circularly polarized on a dual-band multi-azimuth plane, and is suitable for wireless communication.
Description
Technical Field
The invention belongs to the technical field of antennas, and particularly relates to a low-profile dual-band omnidirectional circularly polarized antenna.
Background
With the rapid development of wireless communication technology, an omnidirectional circularly polarized antenna has attracted much attention because of its omnidirectional radiation characteristic and circular polarization performance. The circular polarization performance of the antenna can realize the omnibearing coverage of radio wave signals and receive incident waves polarized in any direction. In addition, the circularly polarized antenna of omnidirectional radiation can be applied to communication equipment moving or rotating at high speed. Therefore, the omnidirectional circularly polarized antenna has wide application prospect.
In recent years, various methods for designing omnidirectional circularly polarized antennas have been proposed by many scholars. For example, slots are etched in the diagonal and sidewalls of the rectangular dielectric of the antenna; back-to-back rectangular patches fed by coplanar waveguides; the array is composed of a dipole fed in phase and a zero phase shift microstrip ring, and the like. However, the antenna is generally large in size, complex in structure, and limited to a single-frequency design.
Disclosure of Invention
The invention provides a low-profile dual-band omnidirectional circularly polarized antenna, aiming at solving the technical problems that the existing omnidirectional circularly polarized antenna is large in size and cannot realize omnidirectional circularly polarized on a dual-band multi-azimuth plane.
The invention is realized by adopting the following technical scheme:
a low profile dual band omni-directional circularly polarized antenna, wherein: the low-profile dual-band omnidirectional circularly polarized antenna consists of a dielectric substrate, a radiation patch and a ground plate, wherein the radiation patch and the ground plate are respectively attached to the upper surface and the lower surface of the dielectric substrate; coaxial feed holes are arranged at the corresponding positions of the centers of the dielectric substrate, the radiation patch and the grounding plate;
the radiation patch consists of a circular radiator and six microstrip lines, the six microstrip lines are uniformly arranged in the circumferential direction of the circular radiator, and one ends of the six microstrip lines are respectively connected with the circular radiator; four dumbbell-shaped hollows are arranged on each microstrip line along the length direction of the microstrip line, and the distances between every two adjacent dumbbell-shaped hollows are equal;
the ground plate is composed of six metal strips, one ends of the six metal strips are connected with each other, the other ends of the six metal strips are uniformly scattered along the circumferential direction, four narrow gaps are formed in the middle of the six metal strips, and two short stubs are arranged on the edges of the other ends of the six metal strips in parallel along the clockwise direction;
the medium substrate is of a hexagonal structure, the six microstrip lines and the six metal strips are arranged on diagonal lines of the medium substrate, and the projection positions of the dumbbell-shaped hollow parts and the narrow gaps are overlapped.
The invention forms a transmission line structure similar to negative magnetic conductivity by etching dumbbell-shaped hollow on a micro-strip line and etching narrow gaps on a metal strip, thereby realizing zero-order and first-order double-frequency resonance (-10dB impedance bandwidth is 2.27-2.48GHz and 3.34-3.6 GHz); two strip-shaped stub lines which are arranged in parallel and extend clockwise along the circumferential direction are arranged at the edge of the metal strip, so that a horizontal polarization field can be excited, the horizontal polarization field is orthogonal to a vertical polarization field excited by a similar negative magnetic conductivity transmission line, the omnidirectional circular polarization of the antenna is realized on a dual-band multi-azimuth plane, and the 3dB axial ratio bandwidths of the two bands are 2.3-2.58GHz and 3.32-3.58GHz respectively.
Compared with the prior art, the omnidirectional circularly polarized antenna has a reasonable structure, effectively solves the technical problem that the existing omnidirectional circularly polarized antenna cannot realize omnidirectional circularly polarized on a dual-band multi-azimuth plane, and is suitable for wireless communication.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a top view of fig. 1.
Fig. 3 is a bottom view of fig. 1.
FIG. 4 is | S of the present invention11Schematic drawing.
FIG. 5 shows the present invention
Axial ratio diagrams of different azimuth angles.
FIG. 6 is a schematic diagram of the axial ratio of the present invention in different azimuthal planes at frequencies of 2.4GHz and 3.5 GHz.
FIG. 7 shows the present invention at θ 40 ° and
gain diagram.
FIG. 8 shows the present invention at a frequency of 2.4GHz
Radiation pattern of the pitch plane.
Fig. 9 is a radiation pattern of the present invention at an azimuth plane of θ 40 ° at a frequency of 2.4 GHz.
FIG. 10 shows the present invention at a frequency of 3.5GHz
Radiation pattern of the pitch plane.
Fig. 11 is a radiation pattern of the present invention at a frequency of 3.5GHz in an azimuth plane of theta 40 deg..
In fig. 1-3: the antenna comprises a radiating patch 1, a dielectric substrate 2, a ground plate 3, a circular radiator 4, a microstrip line 5, a dumbbell-shaped hollow 6, a metal strip 7, a narrow gap 8, a stub 9 and a coaxial feed hole 10.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and embodiments.
As shown in fig. 1 to 3, a low-profile dual-band omni-directional circularly polarized antenna, wherein: the low-profile dual-band omnidirectional circularly polarized antenna consists of a dielectric substrate 2, a radiation patch 1 and an earth plate 3, wherein the radiation patch 1 and the earth plate 3 are respectively attached to the upper surface and the lower surface of the dielectric substrate 2; coaxial feed holes 10 are arranged at the corresponding positions of the centers of the dielectric substrate 2, the radiation patch 1 and the grounding plate 3;
the radiation patch 1 is composed of a circular radiator 4 and six microstrip lines 5, the six microstrip lines 5 are uniformly arranged in the circumferential direction of the circular radiator 4, and one ends of the six microstrip lines 5 are respectively connected with the circular radiator 4; four dumbbell-shaped hollows 6 are arranged on each microstrip line 5 along the length direction of the microstrip line 5, and the distances between the adjacent dumbbell-shaped hollows 6 are equal;
the ground plate 3 is composed of six metal strips 7, one ends of the six metal strips 7 are connected with each other, the other ends of the six metal strips 7 are uniformly scattered along the circumferential direction, four narrow gaps 8 are arranged in the middle of the six metal strips 7, and two short stubs 9 are arranged on the edges of the other ends of the six metal strips 7 in parallel along the clockwise direction;
the dielectric substrate 2 is of a hexagonal structure, the six microstrip lines 5 and the six metal strips 7 are arranged on diagonal lines of the dielectric substrate 2, and the projection positions of the dumbbell-shaped hollow parts 6 and the narrow gaps 8 are overlapped.
The working principle of the invention is as follows: the microstrip line 5 etched with the dumbbell-shaped hollow 6 and the metal strip 7 etched with the narrow gap 8 can form a transmission line structure similar to negative magnetic conductivity, and zero-order and first-order double-frequency resonance is realized; the parallel strip-shaped stubs 9 at the edges of the metal strips 7 can generate a horizontally polarized electric field
The transmission line with similar negative magnetic permeability can generate a vertical polarization electric field Eθ(ii) a The two mutually perpendicular electric fields can be made by adjusting the number and size of the strip stubs 9
And EθHave the same amplitude and generate 90-degree phase difference, so that the omnidirectional circular polarization can be realized on the zero-order and first-order dual-band multi-azimuth planes.
FIG. 4 is a | S diagram of a dual-band omni-directional circularly polarized antenna according to the present invention11Schematic drawing. As can be seen from fig. 4: antenna impedance bandwidth (| S)11|<-10dB) of 2.27-2.48GHz (relative bandwidth of 8.8%) and 3.34-3.6GHz (relative bandwidth of 7.5%), respectively.
FIG. 5 shows the present invention
The axial ratio diagrams of different azimuth angles are shown, wherein curves 1, 2, 3 and 4 respectively represent the axial ratio of the antenna at θ equal to 30 °, 40 °, 50 ° and 60 °. As can be seen from fig. 5: the antenna realizes dual-band circular polarization at angles of theta 30 degrees, 40 degrees, 50 degrees and 60 degrees, and when theta is 30 degrees, the 3dB axial ratio bandwidth of the 2.4GHz band is the narrowest, namely2.38-2.52GHz, but can still cover the WLAN bandwidth (2.4-2.4835GHz) required by the IEEE802.11b standard, and meanwhile, the 3dB axial ratio bandwidth of the 3.5GHz band is 3.32-3.58 GHz; with the increase of theta, the axial ratio bandwidth of the 2.4GHz frequency band is widened; when theta is equal to 40 DEG and 50 DEG, the bandwidth is 2.3-2.58GHz and 2.15-2.75GHz respectively; when theta is 60 degrees, the axial ratios are all less than 3dB in the range of 2.03-3.5 GHz.
Fig. 6 is a schematic diagram of the axial ratio of the present invention in different azimuth planes at frequencies of 2.4GHz and 3.5GHz, where curves 1, 2, 3, and 4 respectively represent the axial ratio of the antenna in the azimuth plane θ of 30 °, 40 °, 50 °, and 60 ° when the frequency is 2.4GHz, and curves 5 and 6 respectively represent the axial ratio of the antenna in the azimuth plane θ of 30 ° and 40 ° when the frequency is 3.5 GHz. As can be seen from fig. 6: at 2.4GHz, the antenna can realize omnidirectional circular polarization in all azimuth angle planes of theta being 30 degrees, 40 degrees, 50 degrees and 60 degrees, and the axial ratio of the planes at all angles is less than 3 dB; at 3.5GHz, the axial ratio of the antenna at each point is less than 3dB in the azimuth plane θ being 30 ° and 40 °.
FIG. 7 shows the present invention at θ 40 ° and
gain diagram. Comparing the variation of the antenna gain in the range of-1-0.1 dBic in the operating band of 2.3-2.5GHz with the variation of the gain in the range of 1.6-2.3dBic in the operating band of 3.3-3.6GHz, it can be seen that: the maximum gain is 2.3dBic at 3.45 GHz.
FIG. 8 shows the present invention at a frequency of 2.4GHz
The radiation pattern of the pitch surface, wherein curves 1 and 2 represent left-hand circular polarization and right-hand circular polarization, respectively. As can be seen from fig. 8: in that
In the pitching plane, the radiation intensity of the main polarization (left-hand circular polarization) at an angle of more than 30 DEG and less than 60 DEG is almost the same, the cross polarization (right-hand circular polarization) at the angle is smaller, and the difference between the main polarization and the cross polarization is smallerOver 15 dB.
Fig. 9 shows the radiation pattern of the present invention in the azimuth plane θ of 40 ° at a frequency of 2.4GHz, wherein curves 1 and 2 represent left-hand circular polarization and right-hand circular polarization, respectively. As can be seen from fig. 9: in the azimuth plane of θ ═ 40 °, the antenna has omnidirectional radiation and cross polarization (right hand circular polarization) is small.
FIG. 10 shows the present invention at a frequency of 3.5GHz
The radiation pattern of the pitch surface, wherein curves 1 and 2 represent left-hand circular polarization and right-hand circular polarization, respectively. As can be seen from fig. 10: in that
The radiation intensity of the main polarization (left-handed circular polarization) in the pitching plane is almost the same at the angle of theta < 30 degrees and theta < 40 degrees. And the cross-polarization (right hand circular polarization) at this angle is small, the difference between the main polarization and the cross-polarization exceeds 20 dB.
Fig. 11 shows the radiation pattern of the present invention in the azimuth plane θ of 40 ° at a frequency of 3.5GHz, wherein curves 1 and 2 represent left-hand circular polarization and right-hand circular polarization, respectively. As can be seen from fig. 11: in the azimuth plane of θ ═ 40 °, the antenna has omnidirectional radiation and cross polarization (right hand circular polarization) is small. In addition, the antenna can also obtain omnidirectional radiation in azimuth planes of θ equal to 30 °, 50 ° and 60 °, which are not listed here.
As the present invention may be embodied in several forms without departing from the spirit or scope of the present invention, it should also be understood that the above-described embodiments are not limited by the details of the foregoing description, but rather should be construed broadly within its scope as defined in the appended claims. It should be noted that, for a person skilled in the art, several modifications and variations within the equivalent scope can be made without departing from the structure of the invention, and these modifications and variations should also be considered as the protection scope of the invention.
Claims (1)
1. A low-profile dual-band omnidirectional circularly polarized antenna is characterized in that: the low-profile dual-band omnidirectional circularly polarized antenna consists of a dielectric substrate (2), a radiation patch (1) and an earth plate (3), wherein the radiation patch (1) and the earth plate (3) are respectively attached to the upper surface and the lower surface of the dielectric substrate (2); coaxial feed holes (10) are arranged at the corresponding positions of the centers of the dielectric substrate (2), the radiation patch (1) and the grounding plate (3);
the radiating patch (1) is composed of a circular radiator (4) and six microstrip lines (5), the six microstrip lines (5) are uniformly arranged in the circumferential direction of the circular radiator (4), and one ends of the six microstrip lines (5) are respectively connected with the circular radiator (4); four dumbbell-shaped hollows (6) are arranged on each microstrip line (5) along the length direction of the microstrip line (5), and the distances between every two adjacent dumbbell-shaped hollows (6) are equal;
the ground plate (3) is composed of six metal strips (7), one ends of the six metal strips (7) are connected with each other, the other ends of the six metal strips (7) are uniformly scattered along the circumferential direction, four narrow gaps (8) are arranged in the middle of the six metal strips (7), and two short section lines (9) are arranged on the edges of the other ends of the six metal strips (7) in parallel along the clockwise direction;
the medium substrate (2) is of a hexagonal structure, the six microstrip lines (5) and the six metal strips (7) are arranged on the diagonal line of the medium substrate (2), and the projection positions of the dumbbell-shaped hollow parts (6) and the narrow gaps (8) are overlapped.
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| CN201711058891.6A CN107910648B (en) | 2017-11-01 | 2017-11-01 | Low-profile dual-band omnidirectional circularly polarized antenna |
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| CN201711058891.6A CN107910648B (en) | 2017-11-01 | 2017-11-01 | Low-profile dual-band omnidirectional circularly polarized antenna |
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| CN107910648B true CN107910648B (en) | 2020-04-17 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019188471A1 (en) * | 2018-03-30 | 2019-10-03 | 株式会社村田製作所 | Antenna module and communication device loading same |
| CN108808237B (en) * | 2018-06-28 | 2020-07-07 | 中国电子科技集团公司第十三研究所 | Planar omnidirectional circularly polarized antenna |
| CN109193148B (en) * | 2018-09-16 | 2020-11-20 | 复旦大学 | Four-frequency-band omnidirectional circularly polarized rectifying antenna |
| CN109687092B (en) * | 2018-12-25 | 2020-12-01 | 深圳市鼎耀科技有限公司 | Low-profile omnidirectional circularly polarized antenna |
| CN111180297B (en) * | 2020-01-03 | 2021-03-30 | 电子科技大学 | Dual-band microstrip line slow wave structure |
| CN113497358B (en) * | 2021-07-21 | 2022-08-12 | 德州学院 | Wide-angle dual-circularly-polarized antenna with low elevation gain enhancement and equipment |
| CN114937869B (en) * | 2022-05-05 | 2023-04-21 | 杭州电子科技大学 | Back-to-back wide-angle circularly polarized microstrip antenna and application thereof in intelligent door lock |
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| CN106329107A (en) * | 2016-10-17 | 2017-01-11 | 山西大学 | Broadband wide-angle omni-directional circularly-polarized antenna |
| CN107104278A (en) * | 2017-04-26 | 2017-08-29 | 山西大学 | It is a kind of that there is wide axle in pitching face than the low section omnidirectional circular-polarized antenna of wave beam |
| CN107275774A (en) * | 2017-06-22 | 2017-10-20 | 山西大学 | A kind of low section omnidirectional circular-polarized antenna of wide axle than wave beam |
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2017
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106329107A (en) * | 2016-10-17 | 2017-01-11 | 山西大学 | Broadband wide-angle omni-directional circularly-polarized antenna |
| CN107104278A (en) * | 2017-04-26 | 2017-08-29 | 山西大学 | It is a kind of that there is wide axle in pitching face than the low section omnidirectional circular-polarized antenna of wave beam |
| CN107275774A (en) * | 2017-06-22 | 2017-10-20 | 山西大学 | A kind of low section omnidirectional circular-polarized antenna of wide axle than wave beam |
Non-Patent Citations (1)
| Title |
|---|
| Wideband Circularly Polarized Antenna Realizing Omnidirectional Radiation in the Wider Azimuth Planes;Xue Chen，Wenmei Zhang;《IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS》;20170707;第16卷;第2461-2464页 * |
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