CN-122026125-A - Broadband circularly polarized antenna array

Abstract

The application provides a broadband circularly polarized antenna array, which relates to the technical field of antennas and comprises a single-layer antenna layer, a first dielectric substrate and a metal plate which are sequentially stacked, wherein the antenna layer comprises a plurality of antenna units which are arranged, each antenna unit comprises a patch-shaped resistor, a first metal sheet and a metal layer fixedly connected with one end of the resistor, one end of the first metal sheet is fixedly connected with the other end of the resistor, the metal layer is of a C-shaped curled structure, and a feed connection end of the metal layer is arranged close to the first metal sheet and forms an opening of the C-shaped curled structure with the first metal sheet. The application can realize low profile, is easy to integrate and improves the wide-angle scanning performance of the antenna array.

Inventors

• Kuang Zhenni
• ZHANG CHONGYANG
• CHEN ZHIJIAO

Assignees

• 北京邮电大学

Dates

Publication Date

20260512

Application Date

20260128

Claims (10)

1. 1. A broadband circularly polarized antenna array is characterized by comprising a single-layer antenna layer, a first dielectric substrate and a metal plate which are sequentially stacked; The antenna layer comprises a plurality of antenna units which are arranged, wherein each antenna unit comprises a resistor, a first metal sheet and a metal layer fixedly connected with one end of the resistor, one end of the first metal sheet is fixedly connected with the other end of the resistor, the metal layer is of a C-shaped curled structure, and a feed connection end of the metal layer is close to the first metal sheet and forms an opening of the C-shaped curled structure with the first metal sheet.
2. 2. The broadband circularly polarized antenna array of claim 1, further comprising a feed network module, wherein a second dielectric substrate is further stacked under the metal plate; the feed network module is fixedly arranged on the upper surface of one side, facing the metal plate, of the second dielectric substrate.
3. 3. The broadband circularly polarized antenna array of claim 2, wherein the first dielectric substrate and the metal plate are formed with a plurality of through holes corresponding in position, so that the feed connection ends of the metal layers in the respective antenna units are electrically connected to the feed network module via the corresponding through holes, respectively.
4. 4. The broadband circularly polarized antenna array according to claim 3, wherein a first metal tube is disposed on the feed connection end, and the first metal tube passes through a through hole on the first dielectric substrate and is electrically connected with the feed network module through a through hole at a corresponding position on the metal plate; The other end of the first metal sheet, which is close to the opening, is provided with a second metal tube, and the second metal tube penetrates through the through hole on the first dielectric substrate and is connected to the metal plate.
5. 5. A wideband circularly polarized antenna array as claimed in claim 3, wherein the antenna element further comprises a second metal sheet disposed between the resistor and the metal layer, the second metal sheet being for connecting the resistor and the metal layer.
6. 6. The broadband circularly polarized antenna array according to claim 5, wherein the C-shaped coil comprises a first C-shaped coil and a second C-shaped coil which are fixedly connected, wherein the radians of the first C-shaped coil and the second C-shaped coil are calculated by archimedes 'spiral equation, one end of the first C-shaped coil, which is close to the archimedes' spiral, is fixedly connected with the first metal tube, one end of the first C-shaped coil, which is far away from the center line, is fixedly connected with one end of the second C-shaped coil, which is close to the center line, and one end of the second C-shaped coil, which is far away from the center line, is fixedly connected with the other end of the second metal sheet.
7. 7. A wideband circularly polarized antenna array according to claim 3, wherein the feed network module comprises a plurality of feed network units comprising feed ports connected by microstrip lines and a plurality of wedge-shaped power splitters connected by graded microstrip lines.
8. 8. The broadband circularly polarized antenna array of claim 7, wherein the feed network unit further comprises a plurality of excitation port groups connected by a tapered microstrip line with a plurality of wedge-shaped power splitters connected by the microstrip line.
9. 9. The broadband circularly polarized antenna array according to claim 8, wherein the antenna layer comprises a plurality of antenna groups, each of the antenna groups comprising the same number of antenna elements with the same opening direction; the number of the excitation port groups is the same as the total number of the antenna groups, and each excitation port group comprises the same number of excitation ports; The excitation port groups are connected with the antenna groups one by one, so that each excitation port is respectively and uniquely connected with one antenna unit.
10. 10. The broadband circularly polarized antenna array according to claim 9, wherein the antenna layer comprises 4 antenna groups, the antenna groups comprising 16 of the antenna elements, and the 16 antenna elements being arranged in a 4 x 4 matrix; the opening directions of the antenna units in the 4 antenna groups are respectively rotated by 90 degrees in sequence by taking the surface central line of the upper surface of the first dielectric substrate as an axis.

Description

Broadband circularly polarized antenna array Technical Field The application relates to the technical field of antennas, in particular to a broadband circularly polarized antenna array. Background Satellite communication is used as a key support for constructing an air-sky-land-sea integrated information network, and is continuously deepened in application in the fields of global broadband access, internet of things, emergency communication and the like. However, the long satellite-to-ground transmission distance, large link loss, and rapid channel change due to the high-speed motion of the low-orbit satellite all present serious challenges for the stability and communication capacity of the satellite-to-ground link. The circularly polarized wave can effectively inhibit the Faraday rotation effect of the ionosphere, reduce the influence of rain and fog attenuation, and lighten polarization mismatch caused by relative motion or posture change of the receiving and transmitting sides, thereby becoming a preferred waveform in satellite communication. Therefore, a high-performance circularly polarized antenna, particularly a circularly polarized array antenna which has high gain and wide frequency band and can realize wide-angle beam scanning, is very important for improving the performance of a satellite communication system. Disclosure of Invention In view of the above, embodiments of the present application provide a broadband circularly polarized antenna array that obviates or mitigates one or more of the disadvantages of the prior art. The application provides a broadband circularly polarized antenna array, which comprises a single-layer antenna layer, a first dielectric substrate 8 and a metal plate 9 which are sequentially stacked; The antenna layer comprises a plurality of arranged antenna units, wherein each antenna unit comprises a resistor 5, a first metal sheet 6 and a metal layer fixedly connected with one end of the resistor 5, one end of the first metal sheet 6 is fixedly connected with the other end of the resistor 5, the metal layer is of a C-shaped curled structure, and a feed connection end of the metal layer is arranged close to the first metal sheet 6 and forms an opening of the C-shaped curled structure with the first metal sheet 6. In some embodiments of the present application, the array further comprises a feed network module 10, and a second dielectric substrate 11 is further stacked under the metal plate 9; the feed network module 10 is fixedly disposed on an upper surface of the second dielectric substrate 11 on a side facing the metal plate 9. In some embodiments of the present application, a plurality of through holes corresponding to the positions are formed on the first dielectric substrate 8 and the metal plate 9, so that the feeding connection ends of the metal layers in the antenna units are electrically connected to the feeding network module 10 through the corresponding through holes, respectively. In some embodiments of the present application, the feed connection end is provided with a first metal tube 1, and the first metal tube 1 passes through a through hole on the first dielectric substrate 8 and is electrically connected with the feed network module through a through hole at a corresponding position on the metal plate 9; the other end of the first metal sheet 6, which is close to the opening, is provided with a second metal tube 7, and the second metal tube 7 passes through a through hole on the first dielectric substrate 8 and is connected to the metal plate 9. In some embodiments of the application, the antenna unit further comprises a second metal sheet 4 arranged between the resistor 5 and the metal layer, the second metal sheet 4 being used for connecting the resistor 5 and the metal layer. In some embodiments of the present application, the C-shaped coiled structure comprises a first C-shaped coiled structure 2 and a second C-shaped coiled structure 3 which are fixedly connected, wherein the radian of each of the first C-shaped coiled structure 2 and the second C-shaped coiled structure 3 is calculated by archimedes 'spiral line equation, one end, close to the archimedes' spiral line, of the first C-shaped coiled structure 2 is fixedly connected with the first metal tube 1, one end, far away from the center line, of the first C-shaped coiled structure 2 is fixedly connected with one end, close to the center line, of the second C-shaped coiled structure 3, and one end, far away from the center line, of the second C-shaped coiled structure 3 is fixedly connected with the other end of the second metal sheet 4. In some embodiments of the present application, the feeding network module 10 includes a plurality of feeding network units 13, and the feeding network units 13 include feeding ports 12 connected by microstrip lines and a plurality of wedge-shaped power splitters 14 connected by graded microstrip lines. In some embodiments of the application, the feed network