CN-122000694-A - Dual polarized antenna and radar device

Abstract

The invention relates to the field of antennas, and particularly discloses a dual-polarized antenna which comprises a slot antenna layer for radiating a first polarized wave and a microstrip antenna layer for radiating a second polarized wave, wherein the slot antenna layer comprises a waveguide structure, the waveguide structure comprises a plurality of radiating units which are distributed along a first direction, the radiating units comprise a plurality of radiating slots which are arranged along a second direction in an extending mode, the microstrip antenna layer comprises a plurality of microstrip array sub-units which are distributed along the first direction, the microstrip array sub-units comprise a plurality of microstrip array elements which are distributed along the second direction, the microstrip antenna layer is arranged on the slot antenna layer, at least one microstrip array sub-unit is arranged between the radiating units, and projections of the microstrip array sub-units and the radiating slots on the waveguide structure are not overlapped with each other.

Inventors

• HUANG DASEN
• CHEN QIDA
• HE MINGYUE
• CHEN QIXIN

Assignees

• 佛山市青松科技股份有限公司

Dates

Publication Date

20260508

Application Date

20260306

Priority Date

20260212

Claims (20)

1. 1. A dual polarized antenna comprising a slot antenna layer for radiating a first polarized wave and a microstrip antenna layer for radiating a second polarized wave; The slot antenna layer comprises a waveguide structure, wherein the waveguide structure comprises a plurality of radiation units which are arranged along a first direction, and the radiation units comprise a plurality of radiation slots which are arranged along a second direction in an extending way; the microstrip antenna layer comprises a plurality of microstrip array subunits arranged along a first direction, and the microstrip array subunits comprise a plurality of microstrip arrays arranged along a second direction; The microstrip antenna layer is arranged on the slot antenna layer, at least one microstrip array subunit is arranged between the radiation units, and projections of the microstrip array and the radiation slot on the waveguide structure are not overlapped with each other.
2. 2. The dual polarized antenna of claim 1, wherein said slot antenna layer is a waveguide slot antenna layer or a substrate integrated waveguide slot antenna layer.
3. 3. A dual polarized antenna according to claim 1 wherein said waveguide structure is provided as a rectangular waveguide or a ridge waveguide.
4. 4. The dual polarized antenna of claim 1, wherein the radiating elements and microstrip array elements are staggered along a first direction, and the surface of the microstrip array element is parallel to the surface of the waveguide structure.
5. 5. The dual polarized antenna of claim 1, wherein said radiating element comprises a plurality of first radiating slots and second radiating slots extending in a second direction, said first radiating slots and second radiating slots being offset in the first direction.
6. 6. The dual polarized antenna of claim 4, wherein said radiating element has a waveguide centerline disposed along a second direction, said first radiating slot and said second radiating slot being disposed on either side of the waveguide centerline.
7. 7. The dual polarized antenna of claim 5, wherein the centerlines of said first and second radiating slots are offset from the centerline of said waveguide by a distance along a first direction that is The wide side length of the waveguide structure is 。
8. 8. A dual polarized antenna according to claim 2 wherein each of said radiating elements of said waveguide slot antenna layer comprises N1 radiating slots and each of said microstrip array subunits comprises N2 microstrip arrays, in a second direction, said number N2 of microstrip arrays being greater than or equal to said number N1 of radiating slots.
9. 9. The dual polarized antenna of claim 2, wherein each of said radiating elements of said substrate integrated waveguide slot antenna layer comprises N1 radiating slots and each of said microstrip array subunits comprises N2 microstrip array elements in a second direction, said number N2 of microstrip array elements being less than or equal to said number N1 of radiating slots.
10. 10. The dual polarized antenna of claim 8, wherein the number of radiating slots N1 is 1-32, and the number of microstrip elements N2 is 1-48.
11. 11. The dual polarized antenna of claim 1, wherein said microstrip antenna layer comprises a ground substrate, a dielectric substrate, a microstrip feed network, microstrip elements and microstrip feed lines, said dielectric substrate is disposed on said ground substrate, and a plurality of said microstrip elements are disposed on said dielectric substrate and connected to said microstrip feed network by said microstrip feed lines.
12. 12. A dual polarized antenna according to claim 11 wherein the ground substrate of the microstrip antenna layer is secured to the waveguide structure of the slot antenna layer by a connector or glue.
13. 13. The dual polarized antenna of claim 1, wherein a surface of said waveguide structure is provided with a plurality of grooves arranged along a first direction, said grooves being adapted to said microstrip array subunits, said microstrip array subunits being disposed within said grooves.
14. 14. A dual polarized antenna according to claim 13 wherein the surface of the microstrip array is flush with the surface of the waveguide structure or the surface of the microstrip array is higher than the surface of the waveguide structure.
15. 15. The dual polarized antenna of claim 1, wherein said waveguide structure has a wide side length in a first direction of Free space wavelength is , ; In the first direction, the narrow side length of the waveguide structure is , 。
16. 16. The dual polarized antenna of claim 15, wherein said radiating slot has a width in a first direction of , 0.1-4Mm; In the second direction, the length of the radiation slit is The wave guide wavelength is , ; In the first direction, in the adjacent radiation units, the interval between the radiation slits is d1, and d1 satisfies the following condition 。
17. 17. The dual polarized antenna of claim 1, wherein said microstrip array has a width in a first direction of , ; Along the second direction, the length of the microstrip array is , ; In the adjacent microstrip array subunits along the first direction, the distance between the microstrip array subunits is d2, and d2 satisfies the following conditions 。
18. 18. The dual polarized antenna of claim 2, wherein said metallized via diameter of said substrate integrated waveguide slot antenna layer is , ; And/or the adjacent metallized via pitch is , 。
19. 19. The dual polarized antenna of claim 18, wherein said metallized via diameter of said substrate integrated waveguide slot antenna layer is d, d being 0.1-1mm; and/or the distance between the adjacent metallized through holes is d3, and d3 is 0.2-4mm.
20. 20. The dual polarized antenna of claim 1, wherein said first polarized wave is orthogonal to the polarization direction of said second polarized wave; The first polarized wave is a horizontal polarized wave, and the second polarized wave is a vertical polarized wave; or the first polarized wave is a vertical polarized wave, and the second polarized wave is a horizontal polarized wave; or the first polarized wave is obliquely polarized at +45 degrees, and the second polarized wave is obliquely polarized at-45 degrees; or the first polarized wave is obliquely polarized at-45 degrees, and +45 degrees are obliquely polarized between the second polarized waves.

Description

Dual polarized antenna and radar device Technical Field The invention relates to the field of antennas, in particular to a dual-polarized antenna and a radar device. Background The dual-polarized antenna is used as a core electromagnetic device capable of synchronously transmitting and receiving two orthogonal polarized electromagnetic waves (horizontal/vertical linear polarization, +/-45-degree linear polarization or orthogonal circular polarization and the like), and by virtue of the advantages of synchronously capturing target polarization scattering characteristics and space propagation information, the dual-channel signal collaborative analysis is used for realizing the accurate representation of target properties and environmental states, and plays an irreplaceable role in the fields of weather detection, target classification, object surface smoothness detection and the like, so that the dual-polarized antenna gradually replaces the traditional single-polarized antenna to become a key component for improving the detection and observation efficiency. The existing dual-polarized antenna mainly comprises a reflecting surface antenna, a microstrip antenna and a waveguide slot antenna, wherein the reflecting surface antenna usually works in a mechanical scanning mode, so that the whole radar structure is large, the placement scene is limited, and the microstrip antenna and the waveguide slot antenna have the characteristics of low section, small volume, light weight and the like. For example, reference 1 discloses a case of dual polarization application of a waveguide slot antenna for CN113178708a, the dual polarization waveguide slot array antenna includes a plurality of horizontally polarized antennas, vertically polarized antennas, and a plurality of power feeders, each of the horizontally polarized antennas is alternately arranged at equal intervals with the vertically polarized antennas. The two polarized antennas comprise a radiation cavity, a base cavity, a waveguide-coaxial converter and a matched load, and are respectively realized in the same flat waveguide tube and the same single-ridge waveguide tube, and the total cross-sectional area of the two polarized antennas is only 45% of that of a standard waveguide tube. One end of each feeder is connected to the waveguide-to-coaxial converter through its first turn section and the other end is connected to the feed through its second turn section. The invention has small volume and group array space, small occupied space of the feeder line wiring and larger scanning range of horizontal and vertical polarized beams, and can be used for weather radar. However, the dual polarization in the prior art 1 is formed by combining a plurality of waveguide slot linear arrays, the combination mode is simple stacking, and in order to realize dual polarization, a certain degree of compromise is performed on the complexity of the structure, the generation process is more complex, and the overall batch production cannot be realized. The comparison document 2 is CN106058475B, which discloses a waveguide microstrip common-caliber antenna unit, comprising a waveguide antenna, microstrip antennas and a reflecting bottom plate, wherein the microstrip antennas and the waveguide antennas are respectively fixed on the upper side and the lower side of the reflecting bottom plate, waveguide antenna radiation gaps are arranged on the reflecting bottom plate, the reflecting bottom plate is in a strip shape, two rows of microstrip antennas are arranged in parallel along the length direction of the reflecting bottom plate, a dielectric plate of each microstrip antenna is perpendicular to the plate surface of the reflecting bottom plate and is parallel to the length direction of the reflecting bottom plate, radiators of the two rows of microstrip antennas are arranged opposite to each other, and the waveguide antennas and the waveguide antenna radiation gaps are positioned between the two rows of microstrip antennas as seen along the direction perpendicular to the reflecting bottom plate. However, the common aperture antenna of the comparison document 2 adopts a ridge waveguide slit antenna and a microstrip antenna to form a common aperture antenna, the dielectric plate of the microstrip antenna is perpendicular to the plate surface of the reflecting bottom plate and is parallel to the length direction of the reflecting bottom plate, and the radiators of the two rows of microstrip antennas are arranged opposite to each other, so that the technical problem of solving the adverse effect between the waveguide antenna and the microstrip antenna, solving the problem of integrated feed and realizing the wide-frequency wide-angle scanning capability is solved. But the structure is complex, the section is high, the volume is large, the manufacturing process is complex, and the mass production is difficult. The invention patent CN112993538B discloses a dual-polarized antenna, which compri