CN112038761A - High-gain circularly polarized antenna - Google Patents
High-gain circularly polarized antenna Download PDFInfo
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- CN112038761A CN112038761A CN202010771773.5A CN202010771773A CN112038761A CN 112038761 A CN112038761 A CN 112038761A CN 202010771773 A CN202010771773 A CN 202010771773A CN 112038761 A CN112038761 A CN 112038761A
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- dielectric substrate
- power divider
- circularly polarized
- polarized antenna
- box body
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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
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- 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
- H01Q5/28—Arrangements for establishing polarisation or beam width over two or more different wavebands
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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
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/378—Combination of fed elements with parasitic elements
-
- 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
- H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
Abstract
The invention discloses a high-gain circularly polarized antenna, which comprises a metal box body, a first dielectric substrate and a second dielectric substrate which are sequentially stacked from bottom to top; a parasitic patch is arranged on the upper surface of the second dielectric substrate, a radiation patch is arranged on the upper surface of the first dielectric substrate, and the parasitic patch and the radiation patch are arranged oppositely; a third dielectric substrate is arranged in the metal box body, and a Wilson power divider is arranged on the third dielectric substrate; the side wall of the metal box body is provided with an SMA coaxial connector; the branch port of the Wilson power divider is electrically connected with the radiation patch, and the combination port of the Wilson power divider is connected with the SMA coaxial connector to feed external equipment, so that circular polarization wave radiation is realized; the radiation patch is provided with a U-shaped gap. The high-gain circularly polarized antenna provided by the invention has the characteristics of simple structure, high gain, small volume and the like.
Description
Technical Field
The invention relates to the field of satellite communication, in particular to a high-gain circularly polarized antenna.
Background
The performance of the antenna, which is an important component module in the maritime satellite communication system, can directly affect the performance of the whole maritime satellite communication system. At present, antennas of a maritime satellite communication system are generally realized by circularly polarized antennas, and signals are received by the circularly polarized antennas, so that on one hand, the leakage of the signals can be reduced, and on the other hand, the polarization distortion caused by the ionosphere Faraday rotation effect can be eliminated.
However, the antenna in the existing marine satellite communication system has the problems of low gain, large volume and the like, and the system performance of the marine satellite communication system is greatly influenced.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a high-gain circularly polarized antenna which can solve the problems of low antenna gain, large volume and the like in a marine satellite communication system in the prior art.
The purpose of the invention is realized by adopting the following technical scheme:
a high-gain circularly polarized antenna comprises a metal box body, a first dielectric substrate and a second dielectric substrate which are sequentially stacked from bottom to top; the upper surface of the second dielectric substrate is provided with a parasitic patch, the upper surface of the first dielectric substrate is provided with a radiation patch, and the parasitic patch and the radiation patch are arranged oppositely; a third dielectric substrate is arranged in the metal box body, and a Wilson power divider is arranged on the third dielectric substrate; the side wall of the metal box body is provided with an SMA coaxial connector; the branch port of the Wilson power divider is electrically connected with the radiation patch, and the combination port of the Wilson power divider is connected with the SMA coaxial connector to feed external equipment so as to realize circular polarization wave radiation; and a U-shaped gap is arranged on the radiation patch.
Further, the wilson power divider is a divide-by-two wilson power divider, and comprises a first branch circuit and a second branch circuit; the amplitude of a first branch and the amplitude of a second branch of the Wilson power divider are the same, and the phase difference is 90 degrees; the difference between the length of the first shunt circuit and the length of the second shunt circuit is a quarter wavelength; the feed probes corresponding to the first shunt port and the second shunt port of the Wilson power divider are electrically connected with the radiation patch respectively; one end of each feed probe is electrically connected with the radiation patch, and the other end of each feed probe extends from the radiation patch to the first dielectric substrate, penetrates through the first dielectric substrate and the top of the metal box body and is electrically connected with a corresponding shunt port of the Wilson power divider arranged in the metal box body.
Further, the parasitic patch is a rectangular parasitic patch.
Further, an air layer is arranged between the first dielectric substrate and the second dielectric substrate.
Furthermore, isolation columns are arranged at four corners of the second dielectric substrate; one end of the isolation column is arranged on the second medium substrate, and the other end of the isolation column extends towards the first medium substrate and penetrates through the first medium substrate to be fixedly connected with the top of the metal box body; the isolation column is a plastic isolation column.
Further, a metal back plate is arranged at the bottom of the metal box body, a closed cavity is formed by the metal back plate and the metal box body, and the Wilson power divider is arranged in the closed cavity.
Furthermore, screws are arranged at four corners of the metal back plate; the bottom of the metal box body is provided with a screw hole corresponding to the screw; the metal back plate is arranged in the corresponding screw hole through a screw, so that the metal back plate is fixed at the bottom of the metal box body.
Furthermore, the first dielectric substrate, the second dielectric substrate and the third dielectric substrate are all F4B dielectric substrates, and the dielectric constants thereof are all 6.15.
Further, the thickness of the second dielectric substrate and the third dielectric substrate is 1.27mm, and the thickness of the first dielectric substrate is 10 mm; the overall size of the circularly polarized antenna is 0.368 lambda0×0.368λ0×0.215λ0(ii) a Wherein λ is0Is the wavelength, λ00.24 m.
Furthermore, a patch resistor for reducing mutual energy coupling between two branch ports and increasing the isolation of the branch ports is arranged at the connection position of an impedance transformation section and the branch of a feed network of the Wilson power divider.
Compared with the prior art, the invention has the beneficial effects that:
according to the high-gain circularly polarized antenna provided by the invention, the patch antenna, the radiation antenna and the Wilson power divider arranged in the metal box body are sequentially stacked, and the feed of the circularly polarized antenna is realized through the electrical connection of the Wilson power divider and the radiation antenna; the patch antenna is arranged right above the radiation antenna, so that the working bandwidth is improved, and the radiation gain of the antenna is improved. The invention has the characteristics of simple structure, small volume, high gain and the like, and the frequency band range completely covers the frequency band required by the maritime satellite communication system; meanwhile, the gain of the system also meets the requirements of a maritime satellite communication system.
Drawings
FIG. 1 is a schematic diagram of a high-gain circularly polarized antenna according to the present invention;
FIG. 2 is an exploded view of the dielectric substrate, the metal case and the metal backplate in FIG. 1
Fig. 3 is a schematic structural view of the parasitic patch and the second dielectric substrate in fig. 1;
fig. 4 is a schematic structural view of the radiation patch and the first dielectric substrate in fig. 1;
FIG. 5 is a schematic structural view of the Wilson power divider and the third dielectric substrate in FIG. 1;
FIG. 6 is a reflection coefficient curve diagram of the high-gain circularly polarized antenna provided by the present invention;
FIG. 7 is a graph of axial ratio of the high-gain circularly polarized antenna provided by the present invention;
FIG. 8 is a graph illustrating the simulated gain of a high-gain circularly polarized antenna according to the present invention;
fig. 9 is a radiation pattern of the high-gain circularly polarized antenna provided by the present invention when it is simulated at the frequency point of 1.52 Ghz;
fig. 10 is a radiation pattern of the high-gain circularly polarized antenna provided by the present invention when it is simulated at the frequency point of 1.6 Ghz;
fig. 11 is a radiation pattern of the high-gain circularly polarized antenna provided by the present invention when the antenna is simulated at the frequency point of 1.68 Ghz.
In the figure: 1. a parasitic patch; 2. a radiation patch; 31. a first feed probe; 32. a second feed probe; 4. a Wilson power divider; 5. a metal case; 6. a metal back plate; 7. an SMA coaxial connector; 8. a chip resistor; 9. an isolation column; 11. a second dielectric substrate; 23. a U-shaped gap; 24. a first dielectric substrate; 21. a first feed probe interface; 22. a second feed probe interface; 41. and a third dielectric substrate.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
Example one
The present invention provides a preferred embodiment, as shown in fig. 1 to 5, a high-gain circularly polarized antenna includes a metal box 5, a first dielectric substrate 24 and a second dielectric substrate 11, which are stacked in sequence from bottom to top.
The first dielectric substrate 24 is disposed on the top of the metal case 5, and the second dielectric substrate 11 is disposed above the first dielectric substrate 24, so that the first dielectric substrate 24 is disposed between the metal case 5 and the second dielectric substrate 11. Preferably, an air layer is provided between the first dielectric substrate 24 and the second dielectric substrate 11.
The upper surface of the first dielectric substrate 24 is provided with a radiation patch 2, the upper surface of the second dielectric substrate 11 is provided with a parasitic patch 1, and the parasitic patch 1 and the radiation patch 2 are arranged in a vertically opposite mode.
The metal box body 5 is internally provided with a third dielectric substrate 41, and the Wilson power divider 4 is arranged on the third dielectric substrate 41. The branch port of the Wilson power divider 4 is electrically connected with the radiation patch 2, and the combining port is connected with the external load equipment for feeding through the SMA coaxial connector 7, so that the radiation of circular polarized waves is realized.
Preferably, the SMA coaxial connector 7 is disposed on a side wall of the metal case 5, and one end of the SMA coaxial connector is electrically connected to the combining port of the wilson power divider 4 in the metal case 5. The other end of the SMA coaxial connector 7 extends from the metal box 5 to the side wall of the metal box 5, penetrates through the side wall of the metal box 5 to the outside of the metal box 5, is electrically connected with an external device, and feeds power to the external device. For example, the circular polarized wave radiation device is electrically connected with an external host to feed power to the external host, so that circular polarized wave radiation is realized.
Preferably, the wilson power divider 4 is a divide-by-two wilson power divider, and includes a first branch and a second branch. Wherein, the first branch is provided with a first branch port, and the second branch is provided with a second branch port. The first shunt port and the second shunt port have the same amplitude and have a phase difference of 90 degrees; and the track length of the first shunt and the track length of the second shunt are different by a quarter wavelength.
Preferably, the high-gain circularly polarized antenna comprises a first feed probe 31 and a second feed probe 32.
The first shunt port is electrically connected to the first feed probe interface 21 on the first shunt of the radiation patch 2 through the first feed probe 31, so as to be electrically connected to the radiation patch 2. Similarly, the second shunt port is electrically connected to the second feed probe interface 22 on the second shunt of the radiation patch 2 through the second feed probe 32, so as to be electrically connected to the radiation patch 2. That is, one end of the first feeding probe 31 is electrically connected to the radiation patch 2, and the other end extends toward the metal case 5 and passes through the first dielectric substrate 24 and the top of the metal case 5 to be electrically connected to the first shunt port 42 of the wilson power divider 4 disposed in the metal case 5. Similarly, one end of the second feeding probe 32 is electrically connected to the radiation patch 2, and the other end extends toward the metal case 5 and penetrates through the first dielectric substrate 24 and the top of the metal case 5 to be electrically connected to the first shunt port 42 of the wilson power divider 4 disposed in the metal case 5.
Preferably, the first feed probe 31 and the second feed probe 32 are coaxial feed probes.
Preferably, the radiating patch 2 is provided with a U-shaped slit 23. The parasitic patch 1 is a rectangular parasitic patch. The parasitic patch 1 is arranged above the radiation patch 2, so that the gain of the antenna is improved; meanwhile, the parasitic patch 1 and the radiation patch 2 are arranged oppositely, so that the maximum gain point is kept right above the antenna.
Preferably, the first feeding probe 31 and the second feeding probe 32 are disposed at the center of the radiating patch 2 and divided by the U-shaped slit 23, so as to achieve impedance matching.
The Wilson power divider 4 with equal amplitude and 90-degree phase difference is adopted to feed the two coaxial feed probes, and the phase difference of two shunt ports of the Wilson power divider 4 can be realized through the quarter extension line. That is, the radiation patch 2 is electrically connected with the ports of the two branches of the wilson power divider 4 through the two feed probes, and the orthogonal phase difference is introduced between the ports of the two branches of the wilson power divider 4 through the two feed probes, so that the circular polarization performance of the antenna is realized.
Preferably, the four corners of the second dielectric substrate 11 are provided with the isolation pillars 9. Each of the isolation pillars 9 extends from the second dielectric substrate 11 to the first dielectric substrate 24 and penetrates through the first dielectric substrate 24 to be fixedly connected with the metal box body 5. Preferably, the isolation column 9 is a plastic isolation column.
Preferably, a metal back plate 6 is mounted to the bottom of the metal case 5. By mounting the metal back plate 6 on the bottom of the metal case 5, the wilson power divider 4 provided on the third dielectric substrate 41 can be sealed inside the metal case 5, and the wilson power divider 4 is prevented from being exposed to the air.
Wherein, four corners of the metal back plate 6 are provided with screws 10. Four corners of the metal box body 5 are arranged on screw holes corresponding to the screws 10. The metal back plate 6 is fixed to the bottom of the metal case 5 by mounting screws 10 to the corresponding screw holes. Preferably, the screw 10 is a countersunk screw.
Preferably, the first dielectric substrate 24, the second dielectric substrate 11 and the third dielectric substrate 41 are all F4B dielectric substrates, and the dielectric constants thereof are all 6.15. Wherein, the thickness of the first dielectric substrate 24 is 10 mm. The thicknesses of the second dielectric substrate 11 and the third dielectric substrate 41 are both 1.27 mm.
Preferably, a patch resistor 8 is arranged at the junction of the impedance transformation section and the shunt of the feed network of the wilson power divider 4. The resistance of the chip resistor 8 is 100 Ω. The chip resistor 8 is used for reducing mutual energy coupling between the two branch ports and increasing the isolation degree of the branch ports.
Preferably, the overall size of the high-gain circularly polarized antenna provided by the invention is only 0.368 lambda0×0.368λ0×0.215λ0. Wherein λ is0Is the wavelength, λ00.24 m. The high-gain circularly polarized antenna provided by the invention has higher gain and smaller volume, and is more suitable for a maritime satellite communication system.
As shown in fig. 6 and 7, the reflection coefficient and axial ratio of the high-gain circularly polarized antenna simulation provided by the present invention are shown. As can be seen from fig. 6 and 7, the frequency band of the overlapping area of the impedance bandwidth and the 3dB axial ratio bandwidth is 1.46GHz to 1.86GHz, and the frequency band completely covers the frequency band range of 1.525GHz to 1.559GHz and the frequency band range of 1.626GHz to 1.66GHz required by the maritime satellite communication system. The high-gain circularly polarized antenna provided by the invention is suitable for a maritime satellite communication system.
As shown in fig. 8, a simulated gain curve of the high-gain circularly polarized antenna provided by the present invention is shown. As can be seen from FIG. 8, in the frequency range from 1.46GHz to 1.86GHz, the gain of the high-gain circularly polarized antenna is between 4.74dBi and 6.44dBi, which satisfies the requirement that the gain of the maritime satellite communication system is between 5.94dBi and 6.44dBi in the frequency range from 1.52GHz to 1.66 GHz.
Fig. 9, 10 and 11 show simulated radiation patterns of the high-gain circularly polarized antenna provided by the invention at three frequency points of 1.52GHz, 1.6GHz and 1.68GHz, respectively. As can be seen from fig. 9, 10 and 11, the high-gain circularly polarized antenna provided by the invention has good right-hand circularly polarized radiation characteristics, and meanwhile, the half-power beam widths of the antenna at three frequency points are respectively 93 °, 90 ° and 87 °, so that the requirement of the antenna in a maritime satellite communication system on the half-power beam width is met.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (10)
1. A high-gain circularly polarized antenna is characterized by comprising a metal box body, a first dielectric substrate and a second dielectric substrate which are sequentially stacked from bottom to top; the upper surface of the second dielectric substrate is provided with a parasitic patch, the upper surface of the first dielectric substrate is provided with a radiation patch, and the parasitic patch and the radiation patch are arranged oppositely; a third dielectric substrate is arranged in the metal box body, and a Wilson power divider is arranged on the third dielectric substrate; the side wall of the metal box body is provided with an SMA coaxial connector; the branch port of the Wilson power divider is electrically connected with the radiation patch, and the combination port of the Wilson power divider is connected with the SMA coaxial connector to feed external equipment so as to realize circular polarization wave radiation; and a U-shaped gap is arranged on the radiation patch.
2. The high-gain circularly polarized antenna of claim 1, wherein the Wilson power divider is a one-to-two Wilson power divider comprising a first branch and a second branch; the amplitude of a first branch and the amplitude of a second branch of the Wilson power divider are the same, and the phase difference is 90 degrees; the difference between the length of the first shunt circuit and the length of the second shunt circuit is a quarter wavelength; the feed probes corresponding to the first shunt port and the second shunt port of the Wilson power divider are electrically connected with the radiation patch respectively; one end of each feed probe is electrically connected with the radiation patch, and the other end of each feed probe extends from the radiation patch to the first dielectric substrate, penetrates through the first dielectric substrate and the top of the metal box body and is electrically connected with a corresponding shunt port of the Wilson power divider arranged in the metal box body.
3. The high-gain circularly polarized antenna of claim 1, wherein said parasitic patch is a rectangular parasitic patch.
4. The high-gain circular polarization antenna of claim 1, wherein an air layer is disposed between the first dielectric substrate and the second dielectric substrate.
5. The high-gain circularly polarized antenna of claim 4, wherein isolation pillars are disposed at four corners of the second dielectric substrate; one end of the isolation column is arranged on the second medium substrate, and the other end of the isolation column extends towards the first medium substrate and penetrates through the first medium substrate to be fixedly connected with the top of the metal box body; the isolation column is a plastic isolation column.
6. The high-gain circularly polarized antenna according to claim 1, wherein a metal back plate is disposed at a bottom of the metal box, a sealed cavity is formed by the metal back plate and the metal box, and the wilson power divider is disposed in the sealed cavity.
7. The antenna of claim 6, wherein screws are disposed at four corners of the metal back plate; the bottom of the metal box body is provided with a screw hole corresponding to the screw; the metal back plate is arranged in the corresponding screw hole through a screw, so that the metal back plate is fixed at the bottom of the metal box body.
8. The high-gain circularly polarized antenna of claim 1, wherein the first dielectric substrate, the second dielectric substrate and the third dielectric substrate are all F4B dielectric substrates, and the dielectric constants thereof are all 6.15.
9. The high-gain circularly polarized antenna of claim 1, wherein the second dielectric substrate and the third dielectric substrate have a thickness of 1.27mm, and the first dielectric substrate has a thickness of 10 mm; the overall size of the circularly polarized antenna is 0.368 lambda0×0.368λ0×0.215λ0(ii) a Wherein λ is0Is the wavelength, λ00.24 m.
10. The high-gain circularly polarized antenna according to claim 1, wherein a patch resistor for reducing mutual energy coupling between two branch ports and increasing the isolation of the branch ports is disposed at a junction between the impedance transformation section and the branch of the feed network of the wilson power divider.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010771773.5A CN112038761A (en) | 2020-08-04 | 2020-08-04 | High-gain circularly polarized antenna |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010771773.5A CN112038761A (en) | 2020-08-04 | 2020-08-04 | High-gain circularly polarized antenna |
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| CN112038761A true CN112038761A (en) | 2020-12-04 |
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| CN202010771773.5A Pending CN112038761A (en) | 2020-08-04 | 2020-08-04 | High-gain circularly polarized antenna |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113113770A (en) * | 2021-04-30 | 2021-07-13 | 广州智讯通信系统有限公司 | Antenna adopting polarization sensitive linear-circular polarization converter |
| CN113794055A (en) * | 2021-08-31 | 2021-12-14 | 东南大学 | Broadband high-gain dual-circular polarization microstrip antenna and communication device |
-
2020
- 2020-08-04 CN CN202010771773.5A patent/CN112038761A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113113770A (en) * | 2021-04-30 | 2021-07-13 | 广州智讯通信系统有限公司 | Antenna adopting polarization sensitive linear-circular polarization converter |
| CN113113770B (en) * | 2021-04-30 | 2024-03-19 | 广州智讯通信系统有限公司 | Antenna adopting polarization sensitive molded line-circular polarization converter |
| CN113794055A (en) * | 2021-08-31 | 2021-12-14 | 东南大学 | Broadband high-gain dual-circular polarization microstrip antenna and communication device |
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