CN105990670B - Circularly polarized antenna and communication equipment - Google Patents
Circularly polarized antenna and communication equipment Download PDFInfo
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- CN105990670B CN105990670B CN201510055464.7A CN201510055464A CN105990670B CN 105990670 B CN105990670 B CN 105990670B CN 201510055464 A CN201510055464 A CN 201510055464A CN 105990670 B CN105990670 B CN 105990670B
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Abstract
The invention is suitable for the technical field of antennas, provides a circularly polarized antenna and aims to solve the problem that a plurality of circularly polarized antennas are adopted to realize communication of different frequency bands in the prior art. The circularly polarized antenna comprises an upper layer radiation patch, a lower layer radiation patch, a substrate and a ground plane, wherein the upper layer radiation patch and the lower layer radiation patch are respectively arranged on two opposite surfaces of the substrate, and the lower layer radiation patch is positioned between the substrate and the ground plane; the upper-layer radiation patch and the lower-layer radiation patch realize feeding through a coaxial feed pin and excite the lower-layer radiation patch, and the lower-layer radiation patch is used as a ground plane of the upper-layer radiation patch and excites the upper-layer radiation patch in a coupling feeding mode. The coaxial feed needle is used for direct feeding to excite the lower-layer radiation patch, so that a low-frequency point is realized; the lower-layer radiation patch is used as a ground plane of the upper-layer radiation patch, and the upper-layer radiation patch is excited to radiate signals in a coupling feed mode so as to realize a high-frequency point, so that a port is used for feeding to realize double-frequency operation.
Description
Technical Field
The invention belongs to the technical field of antennas, and particularly relates to a circularly polarized antenna and communication equipment.
Background
With the rapid development of wireless communication technology, the field related to antenna technology is more and more extensive, and in many special applications, the requirement for antenna performance is higher and higher. In modern communications, with the increase of integration of communication systems, antennas having high gain, wide frequency band or multi-band, circular polarization, miniaturization, wide coverage, etc. are required. In order to meet the actual requirement, structures such as a microstrip antenna, a loop antenna, a horn antenna, a planar monopole antenna, etc. are generally used as implementation manners. These antennas have different drawbacks.
In the prior art, when a multiband circularly polarized antenna is required, different frequency bands are usually realized through a multi-port and multi-antenna system, and the multiband circularly polarized antenna has the defects of large number of antennas, complex structure, poor polarization and gain performance and the like. For example, two circularly polarized antennas are used, and different frequency bands are respectively realized by controlling the structural size and the dielectric constant of each circularly polarized antenna, which brings difficulty to the back-end signal processing.
Disclosure of Invention
The invention aims to provide a circularly polarized antenna, which adopts a single-port and single-antenna system and aims to solve the problem that a plurality of circularly polarized antennas are adopted to realize communication of different frequency bands in the prior art.
The invention is realized in this way, a circularly polarized antenna, comprising an upper radiation patch, a lower radiation patch, a substrate and a ground plane, wherein the upper radiation patch and the lower radiation patch are respectively arranged on two opposite surfaces of the substrate, and the lower radiation patch is positioned between the substrate and the ground plane; the upper-layer radiation patch and the lower-layer radiation patch realize feeding through a coaxial feed pin and excite the lower-layer radiation patch, and the lower-layer radiation patch is used as a ground plane of the upper-layer radiation patch and excites the upper-layer radiation patch in a coupling feeding mode.
Furthermore, an excitation slot is arranged at the central position of the lower radiation patch.
Preferably, the excitation slot is cross-shaped.
Further, the dielectric constant of the upper radiating patch is smaller than that of the lower radiating patch.
Further, the area of the upper radiation patch is smaller than that of the lower radiation patch.
Furthermore, a group of opposite angles of the upper-layer radiation patch are provided with first symmetrical cutting angles, and a group of opposite angles of the lower-layer radiation patch are provided with second symmetrical cutting angles.
Preferably, the first symmetrical chamfer and the second symmetrical chamfer are located at the same angular direction.
Preferably, the first symmetrical chamfer and the second symmetrical chamfer are arranged orthogonal to each other.
Preferably, the angle of the first and second symmetrical tangential angles is 35 ° to 55 °.
Preferably, the angle of the first and second symmetrical tangential angles is 45 °.
Further, the base plate is arched.
The invention also provides communication equipment comprising the circularly polarized antenna.
Compared with the prior art, the invention has the technical effects that: the coaxial feed needle is used for direct feeding to excite the lower-layer radiating patch to realize a low-frequency point, and meanwhile, the lower-layer radiating patch is used as a ground plane of the upper-layer radiating patch and excites the upper-layer radiating patch to radiate signals in a coupling feeding mode to realize a high-frequency point, so that one port is used for feeding to realize two different frequencies to work.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention or in the description of the prior art will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a circularly polarized antenna according to an embodiment of the present invention;
fig. 2 is a top view of the circularly polarized antenna of fig. 1;
fig. 3 is a side view of the circularly polarized antenna of fig. 1;
FIG. 4 is a voltage standing wave ratio plot for the circularly polarized antenna of FIG. 1;
FIG. 5 is a graph of the gain of the circularly polarized antenna of FIG. 1;
fig. 6 is a graph of axial ratio for the circularly polarized antenna of fig. 1.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 and fig. 2, a circular polarization antenna provided in an embodiment of the present invention includes an upper radiation patch 10, a lower radiation patch 20, a substrate 30 and a ground plane 40, where the upper radiation patch 10 and the lower radiation patch 20 are respectively disposed on two opposite surfaces of the substrate 30, and the lower radiation patch 20 is located between the substrate 30 and the ground plane 40; the upper layer radiation patch 10 and the lower layer radiation patch 20 realize feeding through a coaxial feeding pin 50 and excite the lower layer radiation patch 20, and the lower layer radiation patch 20 serves as a ground plane 40 of the upper layer radiation patch 10 and excites the upper layer radiation patch 10 through a coupling feeding mode.
The circularly polarized antenna provided by the embodiment of the present invention utilizes the coaxial feed pin 50 to directly feed to excite the lower layer radiation patch 20, so as to implement a low frequency point, and simultaneously, utilizes the lower layer radiation patch 20 as the ground plane 40 of the upper layer radiation patch 10 and excites the upper layer radiation patch 10 to perform signal radiation in a coupling feed manner, so as to implement a high frequency point, so that a port is utilized to perform feeding to implement two different frequencies to perform work.
In this embodiment, the upper radiation patch 10, the substrate 30, the lower radiation patch 20, and the ground plane 40 are sequentially stacked from top to bottom, the lower radiation patch 20 is fixed on the ground plane 40, preferably, a dielectric layer is further disposed between the lower radiation patch 20 and the ground plane 40, and the dielectric layer is fixed on the ground plane 40 by fastening screws so as to fixedly connect the lower radiation patch 20 and the ground plane 40.
Referring to fig. 1 and 2, in this embodiment, the lower radiation patch 20, the substrate 30 and the upper radiation patch 10 are provided with through holes that are mutually communicated, and the coaxial feed pin 50 sequentially passes through the through holes of the lower radiation patch 20, the substrate 30 and the upper radiation patch 10 to form a feed port of the circular polarization antenna. That is, the lower radiation patch 20 and the upper radiation patch 10 of the present invention share one feed port without providing a plurality of feed ports, so that the structure of the circular polarization antenna is simplified and dual-band signal operation can be simultaneously realized.
Referring to fig. 2, further, an excitation slot 22 is formed in the center of the lower radiation patch 20. It can be understood that by providing the excitation slot 22 on the lower radiation patch 20, the current path on the surface of the lower radiation patch 20 is cut off, so that the current meanders around the slot edge of the excitation slot 22 and the path becomes longer, thus the equivalent size of the lower radiation patch 20 is relatively increased, the resonance frequency is lowered, the physical size of the lower radiation patch 20 is reduced, and the size of the circularly polarized antenna is reduced; and the excitation slot 22 is used for coupling excitation of the upper radiation patch 10. In this embodiment, the excitation slot 22 may also be a slit provided on the lower radiation patch 20.
Referring to fig. 2, the excitation slot 22 is preferably cross-shaped. Circular polarization radiation or dual-band operation is formed by arranging a cross-shaped excitation slot 22 to control the current on the surface of the lower radiation patch 20 so as to excite polarization degenerate modes which are 90 degrees out of phase.
Further, the dielectric constant of the upper radiation patch 10 is smaller than that of the lower radiation patch 20. It is understood that since the dielectric constant of the lower radiating patch 20 is greater than that of the upper radiating patch 10, the coupling between the lower radiating patch 20 and the ground plane 40 is increased, and the stored energy is also increased, thereby facilitating the coupling of the lower radiating patch 20.
Referring to fig. 2, further, the area of the upper radiation patch 10 is smaller than that of the lower radiation patch 20.
Referring to fig. 2, further, a first symmetric cut 15 is formed on a set of opposite corners of the upper radiation patch 10, and a second symmetric cut 25 is formed on a set of opposite corners of the lower radiation patch 20. It can be understood that the upper radiation patch 10 is perturbed by providing a pair of the first symmetric cut angles 15 to realize circular polarization; the lower radiation patch 20 is configured to have a pair of the second symmetric cut angles 25 for perturbation, so as to implement circular polarization. Preferably, the angle of the first and second tangential angles 15, 25 is 45 ± 10 °, for example, the angle of the first and second tangential angles 15, 25 is 45 °, of course, the first and second tangential angles 15, 25 may be other angles, for example, 35 ° to 55 °.
Preferably, the upper radiation patch 10 and the lower radiation patch 20 are identical in shape, e.g., both are rectangular or other shapes.
Referring to fig. 2, preferably, the first symmetric tangent angle 15 and the second symmetric tangent angle 25 are located at the same angular direction. It can be understood that the upper layer radiation patch 10 realizes perturbation by arranging the first symmetric cut angle 15 in the direction of 45 ° to generate two linear polarization electric field components which are orthogonal in space, and makes the amplitudes of the two components opposite and the phase difference of the two components is 90 ° to realize high-frequency circular polarization operation; similarly, the lower radiating patch 20 is perturbed by placing the second symmetric cut-off angle 25 at 45 ° to generate two spatially orthogonal linearly polarized electric field components, which are opposite in amplitude and 90 ° out of phase to each other, to achieve low frequency circular polarization operation.
Referring to fig. 2, preferably, the first symmetric chamfer 15 and the second symmetric chamfer 25 are disposed orthogonally to each other. It can be understood that the upper layer radiation patch 10 realizes perturbation by arranging the first symmetric cut angle 15 in the direction of 45 ° to generate two linear polarization electric field components which are orthogonal in space, and makes the amplitudes of the two components opposite and the phase difference of the two components is 90 ° to realize high-frequency circular polarization operation; similarly, the lower radiating patch 20 is perturbed by placing the second symmetric cut-off angle 25 at 135 ° to generate two spatially orthogonal linearly polarized electric field components, which are opposite in amplitude and 90 ° out of phase, to achieve low frequency circular polarization operation. Or, the upper layer radiation patch 10 realizes perturbation by arranging the first symmetric cut angle 15 in the 135 ° direction to generate two linear polarization electric field components which are orthogonal in space, and makes the amplitudes of the two components opposite and the phase difference of the two components 90 ° to realize high-frequency circular polarization operation; similarly, the lower radiating patch 20 is perturbed by placing the second symmetric cut-off angle 25 at 45 ° to generate two spatially orthogonal linearly polarized electric field components, which are opposite in amplitude and 90 ° out of phase to each other, to achieve low frequency circular polarization operation.
Preferably, the angle of the first and second tangential angles 15, 25 is 45 °. In other embodiments, the angles of the first symmetric chamfer 15 and the second symmetric chamfer 25 may be other angles, or the first symmetric chamfer 15 and the second symmetric chamfer 25 are arc chamfers.
Further, the base plate 30 has an arch shape. By adopting the arched substrate, the area of the radiation patch of the antenna is increased without changing the transverse size of the antenna, so that the radiation performance is improved.
Fig. 4 is a graph of voltage standing wave ratio of the circularly polarized antenna of fig. 1, fig. 5 is a graph of gain of the circularly polarized antenna of fig. 1, and fig. 6 is a graph of axial ratio of the circularly polarized antenna of fig. 1. In fig. 4, the horizontal axis and the vertical axis are frequencies, and the vertical axis is the voltage standing wave ratio, so that it can be seen that in two working frequency ranges, the voltage standing wave ratio is very close to 1, and the display antenna has good characteristic impedance. In fig. 5, the horizontal axis represents radiation angle, and the vertical axis represents gain, and it can be seen from the figure that in the central radiation region, there is a high-gain radiation effect with a wide angle. In fig. 6, the horizontal and vertical directions are radiation angles, the vertical axis is axial ratio, and in the middle region, the axial ratio is uniform and less than 5, showing that the antenna is provided with good circular polarization characteristics in this angular range. As can be seen from fig. 4 to 6, the circular polarization antenna provided by the embodiment of the present invention can generate two circular polarization frequency bands, and can implement the two circular polarization frequency bands by controlling the first symmetric tangent angle 15 and the second symmetric tangent angle 25; in addition, the upper-layer radiation patch 10 and the lower-layer radiation patch 20 which are arranged on the two opposite surfaces of the substrate 30 are adopted, namely, the upper-layer radiation patch 10 and the lower-layer radiation patch 20 are arranged on the same substrate 30, and the invention has the characteristics of simple structure, convenient manufacture and low cost.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A circularly polarized antenna is characterized by comprising an upper radiation patch, a lower radiation patch, a substrate and a ground plane, wherein the upper radiation patch and the lower radiation patch are respectively arranged on two opposite surfaces of the substrate, and the lower radiation patch is positioned between the substrate and the ground plane; the upper-layer radiation patch and the lower-layer radiation patch realize feeding and excite the lower-layer radiation patch through a coaxial feed pin, the coaxial feed pin excites the lower-layer radiation patch to realize a low-frequency point in a direct feeding mode, the lower-layer radiation patch serves as a ground plane of the upper-layer radiation patch and excites the upper-layer radiation patch to realize a high-frequency point in a coupling feeding mode, the lower-layer radiation patch, the substrate and the upper-layer radiation patch are provided with through holes which are communicated with each other, and the coaxial feed pin sequentially penetrates through the through hole of the lower-layer radiation patch, the through hole of the substrate and the through hole of the upper-layer radiation patch to form a feed port of the circularly polarized antenna;
a group of opposite angles of the upper-layer radiation patch are provided with first symmetrical cutting angles, and a group of opposite angles of the lower-layer radiation patch are provided with second symmetrical cutting angles; the first symmetrical chamfer and the second symmetrical chamfer are both arc-shaped chamfers;
the substrate, the upper layer radiation patch, the lower layer radiation patch and the ground plane are all in an arch shape.
2. The circularly polarized antenna of claim 1, wherein the lower radiating patch has an excitation slot at a central position.
3. The circularly polarized antenna of claim 2, wherein said excitation slot is cross-shaped.
4. The circularly polarized antenna of claim 1, wherein the upper radiating patch has an area smaller than that of the lower radiating patch.
5. The circularly polarized antenna of claim 1, wherein the dielectric constant of the upper radiating patch is less than the dielectric constant of the lower radiating patch.
6. The circularly polarized antenna of claim 5, wherein the first tangential angle of symmetry and the second tangential angle of symmetry are at the same angular orientation.
7. The circularly polarized antenna of claim 5, wherein the first and second cut angles of symmetry are disposed orthogonal to each other.
8. The circularly polarized antenna of any one of claims 5 to 7, wherein the angles of the first and second symmetric cut angles are 35 ° to 55 °.
9. The circularly polarized antenna of claim 8, wherein the angle is 45 °.
10. A communication device comprising a circularly polarized antenna according to any of claims 1-9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510055464.7A CN105990670B (en) | 2015-01-30 | 2015-01-30 | Circularly polarized antenna and communication equipment |
| PCT/CN2016/072569 WO2016119725A1 (en) | 2015-01-30 | 2016-01-28 | Antenna, antenna system and communication device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510055464.7A CN105990670B (en) | 2015-01-30 | 2015-01-30 | Circularly polarized antenna and communication equipment |
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| CN105990670A CN105990670A (en) | 2016-10-05 |
| CN105990670B true CN105990670B (en) | 2021-05-07 |
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| CN201510055464.7A Active CN105990670B (en) | 2015-01-30 | 2015-01-30 | Circularly polarized antenna and communication equipment |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109286071B (en) * | 2018-10-25 | 2020-09-25 | 广东曼克维通信科技有限公司 | Miniaturized dual-band radio frequency identification circular polarization antenna |
| CN110233360B (en) * | 2019-04-23 | 2020-10-16 | 中天宽带技术有限公司 | Dual-band antenna and electronic equipment |
| CN110718770A (en) * | 2019-09-29 | 2020-01-21 | 山西大学 | Full-polarization reconfigurable MIMO antenna |
| CN112952340B (en) * | 2019-11-26 | 2023-04-28 | 华为技术有限公司 | Antenna structure, circuit board with antenna structure and communication equipment |
| CN112467353B (en) * | 2020-11-20 | 2023-12-08 | Oppo广东移动通信有限公司 | Antenna device and electronic equipment |
| CN112751189B (en) * | 2020-12-28 | 2023-07-28 | Oppo广东移动通信有限公司 | Antenna assembly and electronic equipment |
| CN114824772B (en) * | 2022-05-06 | 2024-03-26 | 嘉兴金领电子有限公司 | Light circularly polarized antenna and mounting method thereof |
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| EP1650830A1 (en) * | 2004-10-21 | 2006-04-26 | Electronics and Telecommunications Research Institute | Circularly polarized patch antenna using metal patch and transceiving array antenna using the same |
| CN102280699A (en) * | 2011-05-04 | 2011-12-14 | 电子科技大学 | LTCC (Low Temperature Co-fired Ceramic) laminated coupled feed circular-polarized micro-strip patch antenna |
| CN102610909A (en) * | 2012-03-01 | 2012-07-25 | 西安电子科技大学 | Single-fed dual-bandwidth wave beam circular polarization antenna |
| CN203883115U (en) * | 2013-12-12 | 2014-10-15 | 深圳光启创新技术有限公司 | Circularly-polarized antenna, circularly-polarized antenna system, and communication equipment |
| CN204375948U (en) * | 2015-01-30 | 2015-06-03 | 深圳光启高等理工研究院 | Circular polarized antenna and communication equipment |
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2015
- 2015-01-30 CN CN201510055464.7A patent/CN105990670B/en active Active
Patent Citations (5)
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|---|---|---|---|---|
| EP1650830A1 (en) * | 2004-10-21 | 2006-04-26 | Electronics and Telecommunications Research Institute | Circularly polarized patch antenna using metal patch and transceiving array antenna using the same |
| CN102280699A (en) * | 2011-05-04 | 2011-12-14 | 电子科技大学 | LTCC (Low Temperature Co-fired Ceramic) laminated coupled feed circular-polarized micro-strip patch antenna |
| CN102610909A (en) * | 2012-03-01 | 2012-07-25 | 西安电子科技大学 | Single-fed dual-bandwidth wave beam circular polarization antenna |
| CN203883115U (en) * | 2013-12-12 | 2014-10-15 | 深圳光启创新技术有限公司 | Circularly-polarized antenna, circularly-polarized antenna system, and communication equipment |
| CN204375948U (en) * | 2015-01-30 | 2015-06-03 | 深圳光启高等理工研究院 | Circular polarized antenna and communication equipment |
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