Radar antenna and radar antenna system

Abstract

The application relates to a radar antenna and a radar antenna system, comprising a bottom plate, a side plate and a partition component; the partition component is arranged in an area surrounded by the bottom plate and the side plate, and divides the area into multiple cavities; the multiple cavities form a mode conversion module, a waveguide power division module and a waveguide radiation module connected in sequence, and the multiple cavities comprise a first power division cavity constituting the waveguide power division module and a first radiation cavity constituting the waveguide radiation module; the first power division cavity is formed by a first gap formed by the partition component and the side plate, and the first radiation cavity is formed by a second gap formed by the partition component and the side plate; the mode conversion module is used for realizing mutual conversion between a non-planar wave and a planar wave of a microwave signal; the waveguide power division module is used for performing amplitude and phase distribution on the planar wave output by the mode conversion module, obtaining multiple microwave transmission signals, and transmitting the multiple microwave transmission signals to the waveguide radiation module respectively; and the application can be applied to high-frequency, high-integration and high-side lobe suppression antennas.

Description

Technical Field

[0001] This application relates to the field of antenna technology, and in particular to a radar antenna and a radar antenna system. Background Technology

[0002] Weather radar is widely used for atmospheric detection. It includes a weather radar antenna that receives and transmits microwave signals. Because weather radar antennas require high levels of sidelobe suppression, reflector-type antennas are generally used in weather radar systems. However, reflector-type antennas are relatively large, resulting in lower integration density for the weather radar system.

[0003] To reduce the size of weather radar antennas, the sidelobe suppression of low-profile antennas can be improved, making them suitable for use in weather radar. For example, the aforementioned low-profile antenna can be assembled from multiple modules, such as a waveguide power divider module and a waveguide radiation module.

[0004] The current antenna assembly methods result in weather radar antennas being too large, which cannot meet the requirements of high-frequency antennas. Summary of the Invention

[0005] Therefore, it is necessary to provide a radar antenna and a radar antenna system to address the aforementioned technical problems.

[0006] A radar antenna includes a base plate, side plates, and a segmentation component; the segmentation component is disposed in the area enclosed by the base plate and the side plates, and divides the area into multiple cavities;

[0007] Multiple cavities form a mode conversion module, a waveguide power divider module, and a waveguide radiation module connected in sequence, and the multiple cavities include a first power divider cavity constituting the waveguide power divider module and a first radiation cavity constituting the waveguide radiation module; wherein, the first power divider cavity is formed by a first gap composed of a dividing component and a side plate, and the first radiation cavity is formed by a second gap composed of a dividing component and a side plate.

[0008] The mode conversion module is used to realize the mutual conversion of microwave signals between non-plane waves and plane waves; the waveguide power divider module is used to perform amplitude and phase distribution on the plane wave output by the mode conversion module to obtain multiple microwave transmission signals, and transmit the multiple microwave transmission signals to the waveguide radiation module respectively.

[0009] In one embodiment, the above-mentioned segmentation components are multiple, and the multiple cavities also include a second power-dividing cavity and a third power-dividing cavity constituting a waveguide power-dividing module, as well as a second radiation cavity constituting a waveguide radiation module;

[0010] The second power distribution cavity is formed by a third gap consisting of multiple segmented components; the second radiation cavity is formed by a fourth gap consisting of multiple segmented components; and the third power distribution cavity is formed by a fifth gap between two side plates.

[0011] In one embodiment, the plurality of segmentation components include multi-level segmentation components aligned at the top; the upper-level segmentation components are symmetrically arranged on both sides of the lower-level segmentation components; the height of the upper-level segmentation components is less than the height of the lower-level segmentation components.

[0012] In one embodiment, the second radiation cavity includes a plurality of radiation sub-cavities, which are formed by a sixth gap consisting of a first-level segmentation component and other levels of segmentation components.

[0013] In one embodiment, the second power distribution cavity includes a multi-level first power molecular cavity extending along the height direction, and a second power molecular cavity that laterally connects adjacent levels of first power molecular cavities; the first power molecular cavity is formed by a gap between the longitudinal sidewalls of adjacent dividing components; the multi-level first power molecular cavities are staggered in the height direction.

[0014] In one embodiment, the number of levels of the aforementioned segmentation components is related to the number of power dividers in the waveguide power divider module.

[0015] In one embodiment, the plurality of segmentation components further include a C-shaped segmentation component; the C-shaped segmentation component is used to divide the space between the side plate and the bottom plate into two sub-spaces connected by a C-shaped reflective surface, forming the cavity of the mode conversion module.

[0016] In one embodiment, the multi-level segmentation component includes a first-level segmentation component, a second-level segmentation component, a third-level segmentation component, a fourth-level segmentation component, and a fifth-level segmentation component arranged in ascending order of segmentation component height;

[0017] The first radiation cavity is formed by a longitudinal gap consisting of a side plate and a first-stage segmentation component;

[0018] The second radiation cavity includes a first radiation sub-cavity formed by the longitudinal gap between the first-level segmentation component and the fifth-level segmentation component, and two first cavity groups symmetrically arranged on both sides of the first radiation sub-cavity.

[0019] The first cavity group includes a second radiating sub-cavity formed by the longitudinal gap between the first-level segmentation component and the fourth-level segmentation component, and two second cavity groups symmetrically arranged on both sides of the second radiating sub-cavity.

[0020] The second cavity group includes two third radiating sub-cavities, two fourth radiating sub-cavities, and two third radiating sub-cavities arranged in sequence;

[0021] The third radiating sub-cavity is formed by the longitudinal gap between the first-level segmentation component and the second-level segmentation component; the fourth radiating sub-cavity is formed by the longitudinal gap between the first-level segmentation component and the third-level segmentation component.

[0022] In one embodiment, the side panel includes a first sidewall, a second sidewall, a third sidewall, and a fourth sidewall arranged from top to bottom along the height direction;

[0023] The longitudinal gap between the first sidewall and one of the sidewalls of the first-stage segmentation component forms the first radiation cavity;

[0024] The gaps between the second sidewall and the other sidewall of the first-level dividing component, the sidewall of the second-level dividing component, the sidewall of the third-level dividing component, the sidewall of the fourth-level dividing component, and the sidewall of the fifth-level dividing component constitute the first power dividing cavity.

[0025] The longitudinal gap between the third sidewalls of the two side plates forms the third functional cavity;

[0026] The seventh gap between the fourth sidewall and the bottom plate, and the C-shaped segment in the segmentation component, constitutes the cavity of the mode conversion module.

[0027] In one embodiment, the radar antenna further includes a baffle perpendicular to the side plate; the baffle is movably linked to the side plate and the segmentation component;

[0028] Multiple limiting grooves are provided on the baffle; the limiting grooves are used to limit the side plate and / or segmented components.

[0029] A radar antenna system comprising at least two radar antennas as described above, wherein the at least two radar antennas operate at different frequencies.

[0030] The aforementioned radar antenna and radar antenna system include a base plate, side plates, and a segmentation component. The segmentation component is disposed in the area enclosed by the base plate and side plates, dividing the area into multiple cavities. These multiple cavities form a mode conversion module, a waveguide power divider module, and a waveguide radiation module connected in sequence. Each cavity includes a first power divider cavity constituting the waveguide power divider module and a first radiation cavity constituting the waveguide radiation module. The first power divider cavity is formed by a first gap formed by the segmentation component and the side plates, and the first radiation cavity is formed by a second gap formed by the segmentation component and the side plates. The mode conversion module is used to realize the mutual conversion of microwave signals between non-plane waves and plane waves. The waveguide power divider module is used to perform amplitude and phase distribution on the plane wave output by the mode conversion module to obtain multiple microwave transmission signals, and transmits the multiple microwave transmission signals to the waveguide radiation module respectively. The mode conversion module in the aforementioned radar antenna can convert non-planar waves into plane waves, thereby improving the sidelobe suppression of the radar antenna's E-plane. The waveguide power divider in the aforementioned radar antenna can perform amplitude and phase configuration of the plane waves to achieve beamforming, which can improve the sidelobe suppression of the radar antenna's H-plane and realize a low-sidelobe radar antenna. In addition, the aforementioned radar antenna is composed of a base plate, side plates, and segmentation components, making the antenna size much smaller than that of a reflector-type antenna, thus improving the integration of the radar antenna. Furthermore, the aforementioned segmentation components can divide the area into multiple cavities, and the multiple cavities include a first power-dividing cavity formed by a first gap composed of segmentation components and side plates, and a first radiation cavity formed by a second gap composed of segmentation components and side plates. By dividing the area through segmentation components, it is not necessary to assemble individual modules, allowing the aforementioned radar antenna to be applied to higher frequency bands such as the U-band and V-band, reducing the implementation difficulty of high-frequency radar antennas. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the radar antenna structure in one embodiment;

[0032] Figure 2 This is a schematic diagram of the waveguide power divider module and the waveguide radiation module in one embodiment;

[0033] Figure 3 This is a schematic diagram of the waveguide power divider module and the waveguide radiation module in one embodiment;

[0034] Figure 4 This is a schematic diagram of the mode conversion module in one embodiment;

[0035] Figure 5 This is a schematic diagram of the C-shaped segment component in one embodiment;

[0036] Figure 6 This is a schematic diagram of the radar antenna structure in one embodiment;

[0037] Figure 7 This is a schematic diagram of the radar antenna structure in one embodiment. Attached Figure Description

[0039] 10. Base plate; 20. Side plate; 30. Dividing components;

[0040] 40. Mode conversion module; 50. Waveguide power divider module; 51. First power divider cavity;

[0041] 52. Second power distribution cavity; 53. Third power distribution cavity;

[0042] 60. Waveguide radiation module; 61. First radiation cavity; 62. Second radiation cavity;

[0043] 31. First-level segmentation component; 32. Second-level segmentation component; 33. Third-level segmentation component;

[0044] 34. Fourth-level segmentation component; 35. Fifth-level segmentation component; 301. C-type segmentation component;

[0045] 621. First radiating sub-cavity; 622. Second radiating sub-cavity; 623. Third radiating sub-cavity;

[0046] 624. Fourth radiating sub-cavity; 21. First sidewall; 22. Second sidewall; 23. Third sidewall;

[0047] 24. Fourth side wall; 70. Baffle; 71. Limiting groove. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0049] The radar antenna and radar antenna system provided in this application can be applied to weather radar, as well as detection radar, navigation radar, and other application scenarios, without limitation. The radar antenna can be connected to a transmitter to radiate the microwave signal output by the transmitter into free space, or it can be connected to a receiver to transmit the received microwave signal to the receiver for processing.

[0050] In one embodiment, such as Figure 1As shown, a radar antenna is provided. The radar antenna includes a base plate 10, a side plate 20, and a segmentation component 30. The segmentation component 30 is disposed in the area enclosed by the base plate 10 and the side plate 20, dividing the area into multiple cavities. These multiple cavities form a mode conversion module 40, a waveguide power divider module 50, and a waveguide radiation module 60 connected in sequence. Each cavity includes a first power divider cavity 51 constituting the waveguide power divider module 50 and a first radiation cavity 61 constituting the waveguide radiation module 60. The first power divider cavity 51 is formed by a first gap formed by the segmentation component 30 and the side plate 20, and the first radiation cavity 61 is formed by a second gap formed by the segmentation component 30 and the side plate 20. The mode conversion module 40 is used to realize the mutual conversion of microwave signals between non-plane waves and plane waves. The waveguide power divider module 50 is used to perform amplitude and phase distribution on the plane wave output by the mode conversion module 40 to obtain multiple microwave transmission signals, and transmits the multiple microwave transmission signals to the waveguide radiation module 60 respectively.

[0051] The radar antenna may include a base plate 10, side plates 20, and a dividing component 30. The dividing component is disposed in the area enclosed by the base plate 10 and the side plates 20, dividing the area into multiple cavities. The base plate 10, side plates 20, and dividing component 30 may be made of metal or non-metallic materials through surface treatment, as long as they can enable the transmission of microwave signals within the cavities. The base plate 10 and side plates 20 may have regular shapes or irregular shapes based on the antenna's structural design requirements; no limitation is made here. The base plate 10 and side plates 20 may enclose a region; for example, the side plates 20 may include two mutually perpendicular plates, and a region can be enclosed by the two side plates 20 and the base plate 10; or, the base plate 10 and side plates 20 may be combined with other baffles to enclose a region; no limitation is made here. The region enclosed by the base plate 10 and side plates 20 may be a regular cuboid region or an irregular region; no limitation is made here.

[0052] The aforementioned dividing component 30 can be disposed in the area enclosed by the base plate 10 and the side plate 20, dividing the area into multiple cavities. There can be one or more dividing components 30. The dividing component 30 can be an irregularly shaped component or a regularly shaped component, without limitation; for example, the dividing component can include a stepped component. The dimensions of the base plate 10, the side plate 20, and the dividing component 30 can be equal in the same extending direction, which can be perpendicular to the microwave propagation direction in the waveguide power divider module 50 and the mode conversion module 40.

[0053] The aforementioned cavities can form a mode conversion module 40, a waveguide power divider module 50, and a waveguide radiation module 60 connected in sequence. The mode conversion module 40 can be used to convert microwave signals between non-plane waves and plane waves. The first end of the mode conversion module 40 can be connected to the transceiver of a radar system, converting the uplink signal output by the transceiver from a non-plane wave to a plane wave, and also converting received plane waves to non-plane waves. The non-plane waves are then transmitted to the transceiver for processing via the interface.

[0054] The aforementioned waveguide power divider module 50 can be used to perform amplitude and phase distribution on the plane wave output by the mode conversion module 40, obtaining multiple microwave transmission signals, and transmitting these signals to the waveguide radiation module 60. The combining terminal of the waveguide power divider module 50 can be connected to the second terminal of the mode conversion module 40, allowing it to power divide the plane wave output by the mode conversion module 40 to obtain multiple microwave transmission signals. The waveguide power divider module can perform amplitude and phase distribution on the plane wave, achieving beamforming. The waveguide power divider module 50 can include multiple cascaded power divider units. For example, the first-stage power divider unit in the waveguide power divider module 50 can split the microwave signal into two branch signals, and the second-stage power divider unit can further divide one of the branch signals. The waveguide power divider module 50 can split the microwave signal into 2, 4, 8, 16, 32, etc., without limitation. Each branch port of the aforementioned waveguide power divider module 50 can be connected to a waveguide radiation module 60, through which microwave signals are radiated into free space. The aforementioned waveguide power divider module 50 can also combine the microwave signals received by the various waveguide radiation modules 60, and transmit the combined microwave signal to the mode conversion module 40 through the combiner port.

[0055] The aforementioned cavities may include a first power-sharing cavity 51 constituting the waveguide power-sharing module 50, and a first radiation cavity 61 constituting the waveguide radiation module 60; wherein, the first power-sharing cavity 51 is formed by a first gap consisting of a dividing component 30 and a side plate 20, and the first radiation cavity 61 is formed by a second gap consisting of a dividing component and a side plate 20.

[0056] The waveguide power divider module 50 may include a first power divider cavity 51, which may be formed by a first slot consisting of a segmentation component 30 and a side plate 20. The radar antenna may include two side plates 20, each of which may form a slot with the segmentation component 30; that is, the waveguide power divider module 50 may contain two first power divider cavities 51. The waveguide radiation module 60 may include a first radiation cavity 61, which may be formed by a second slot consisting of the segmentation component 30 and the side plate 20. In the height direction of the radar antenna, the distances between the first slot and the second slot and the base plate 10 may be different. For example, the first slot may be located above the second slot.

[0057] Optionally, the mode conversion module 40, waveguide power divider module 50, and waveguide radiation module 60 can be flat rectangular waveguide interfaces. That is, the interface between the cavity of the mode conversion module 40 and the cavity of the waveguide power divider module 50, and the interface between the cavity of the waveguide power divider module 50 and the cavity of the waveguide radiation module 60, are matched with the flat rectangular waveguide interface. This flat rectangular waveguide interface can improve the radiation bandwidth of the radar antenna, realizing a wideband, low-sidelobe antenna.

[0058] The mode conversion module 40 in the aforementioned radar antenna can convert non-planar waves into planar waves, thereby improving the sidelobe suppression of the radar antenna's E-plane. The waveguide power divider module 50 in the aforementioned radar antenna can perform amplitude and phase configuration of the planar waves to achieve beamforming, which can improve the sidelobe suppression of the radar antenna's H-plane, realizing a low-sidelobe radar antenna. In addition, the aforementioned radar antenna is composed of a base plate 10, a side plate 20, and a segmentation component 30, making the antenna size much smaller than that of a reflector-type antenna, improving the integration of the radar antenna. Furthermore, the aforementioned segmentation component 30 can divide the area into multiple cavities, and the multiple cavities include a first power divider cavity 51 formed by a first slot formed by the segmentation component 30 and the side plate 20, and a first radiation cavity 61 formed by a second slot formed by the segmentation component 30 and the side plate 20. By dividing the area through the segmentation component 30, it is not necessary to assemble each independent module, allowing the aforementioned radar antenna to be applied to higher frequency bands such as the U-band and V-band, reducing the implementation difficulty of high-frequency radar antennas.

[0059] In one embodiment, such as Figure 2 As shown, there are multiple segmentation components, and the multiple cavities also include a second power distribution cavity 52 and a third power distribution cavity 53 constituting the waveguide power distribution module 50, and a second radiation cavity 62 constituting the waveguide radiation module 60; wherein, the second power distribution cavity 52 is formed by a third gap composed of multiple segmentation components 30, the second radiation cavity 62 is formed by a fourth gap composed of multiple segmentation components 30, and the third power distribution cavity 53 is formed by a fifth gap between two side plates 20.

[0060] The radar antenna may include multiple segmented components 30, which may be parallel to... Figure 2 The Z-axis direction is set in the image. This Z-axis direction can be perpendicular to the propagation direction of the microwave signal in the radar antenna. The multiple segmented components 30 can be fixed to a baffle perpendicular to the segmented component 30, or they can be movably connected to the baffle; this is not limited here.

[0061] The second power distribution cavity 52 is formed by a third gap consisting of multiple segmented components 30, meaning that the second power distribution cavity 52 is the cavity in the waveguide power distribution module 50 that is far from the side plate 20. The third power distribution cavity 53 is formed by a fifth gap between the two side plates 20, meaning that the third power distribution cavity 53 is the cavity in the waveguide power distribution module 50 that is far from the segmented components. The second radiation cavity 62 is formed by a fourth gap consisting of multiple segmented components, meaning that the second radiation cavity 62 is the cavity in the waveguide radiation module 60 that is far from the side plate 20.

[0062] The radar antenna mentioned above includes multiple segmented components 30. Even when the radar antenna has a large number of power dividers and radiation channels, a relatively complex antenna structure can be obtained by dividing a region into multiple cavities, thus reducing the difficulty of implementing complex antennas.

[0063] In one embodiment, such as Figure 3 As shown, the above-mentioned multiple segmentation components 30 may include multi-level segmentation components 30 with top alignment; the upper-level segmentation component 30 is symmetrically arranged on both sides of the lower-level segmentation component 30; the height of the upper-level segmentation component is less than the height of the lower-level segmentation component.

[0064] The number of levels in the aforementioned multi-level segmentation component 30 is related to the number of power distribution paths in the waveguide power distribution module 50. The number of power distribution paths in the aforementioned waveguide power distribution module 50 can be exponentially related to the number of levels in the multi-level segmentation component. For example, when the number of power distribution paths is 16, the aforementioned multiple segmentation components 30 may include 4 levels of segmentation components; when the number of power distribution paths is 32, the aforementioned multiple segmentation components may include 5 levels of segmentation components.

[0065] The aforementioned multi-level segmentation components 30 can be aligned at the top, and the heights of the segmentation components 30 at different levels are different; the height of the upper-level segmentation component 30 can be less than the height of the lower-level segmentation component 30. The upper-level segmentation components can be symmetrically arranged on both sides of the lower-level segmentation component.

[0066] Figure 3Taking the waveguide power divider module 50 as an example of 1 to 16, the aforementioned multiple division components may include a first-level division component 31, a second-level division component 32, a third-level division component 33, and a fourth-level division component 34. Specifically, two third-level division components 33 are symmetrically arranged on both sides of the fourth-level division component 34, two second-level division components 32 are symmetrically arranged on both sides of each third-level division component 33, and two first-level division components 31 are symmetrically arranged on both sides of each second-level division component 32.

[0067] Based on the aforementioned multi-level segmentation components, the second radiation cavity 62 may include a cavity. The second radiation cavity 62 may be formed by a sixth gap created by the first-level segmentation component 31 and other level segmentation components. For example... Figure 3 As shown, the second radiation cavity 62 may include cavities A formed by gaps between multiple first-level dividing components 31 and second-level dividing components 32, cavities B formed by gaps between multiple first-level dividing components 31 and third-level dividing components 33, and cavities C formed by gaps between two first-level dividing components 31 and fourth-level dividing components 34.

[0068] The waveguide power divider module 50 in the radar antenna may include multi-level power divider units. When the tops of the multi-level divider components are aligned, the multi-level power divider units may also be arranged sequentially along the height direction. In other words, the cavities constituting the multi-level power divider units may be connected from bottom to top.

[0069] Optionally, the second power distribution cavity 52 may include multiple levels of first power molecular cavities extending along the height direction, and a second power molecular cavity that laterally connects adjacent levels of first power molecular cavities. The first power molecular cavities are formed by gaps between the longitudinal sidewalls of adjacent dividing components; the multiple levels of first power molecular cavities are staggered in the height direction. For example... Figure 3 As shown, the second power distribution cavity 52 may include multiple first power distribution cavities extending along the Y-axis, such as cavity D formed by the gap between the longitudinal sidewalls of the fourth-level dividing component 34 and the third-level dividing component 33, cavity E formed by the gap between the longitudinal sidewalls of the fourth-level dividing component 34 and the second-level dividing component 32, and cavity F formed by the gap between the longitudinal sidewalls of the third-level dividing component 33 and the third-level dividing component 33.

[0070] In the aforementioned radar antenna, the area enclosed by the side plate 20 and the base plate 10 is divided into multiple cavities by multi-level segmentation components 30 with different heights, which can reduce the number of segmentation components and simplify the processing and assembly process of the radar antenna.

[0071] In one embodiment, such as Figure 4As shown, the aforementioned plurality of segmented components 30 also includes a C-shaped segmented component 301. In the aforementioned C-shaped segmented component, one of its sidewalls can have a C-shaped boundary along the Z-axis direction, such as... Figure 5 As shown. The Z-axis mentioned above can be perpendicular to the propagation direction of the microwave signal in the radar antenna.

[0072] The aforementioned C-shaped segmentation component 301 can be located between the multi-level segmentation component and the base plate 10, used to divide the space between the side plate 20 and the base plate 10 into upper and lower sub-spaces connected by a C-shaped reflective surface, forming the cavity of the mode conversion module 40. For example... Figure 4 As shown, the microwave signal can propagate along direction 1 in the lower subspace to the C-shaped reflector, and then propagate along the C-shaped reflector to the upper subspace, where the non-planar wave is converted into a plane wave. The plane wave can then propagate along direction 2 into the cavity of the waveguide power divider module 50. The aforementioned C-shaped segmentation component can be an independent component or connected to a side plate or other segmentation components.

[0073] The radar antenna described above, by setting the C-type segmentation component 301, can realize mode conversion between non-plane waves and plane waves, thereby improving the sidelobe suppression of the radar antenna's E-plane.

[0074] In one embodiment, a radar antenna including a 32-channel waveguide radiation module 60 is provided, such as... Figure 6 As shown. In the radar antenna described above, the multi-level segmentation components include a first-level segmentation component 31, a second-level segmentation component 32, a third-level segmentation component 33, a fourth-level segmentation component 34, and a fifth-level segmentation component 35, arranged in ascending order of segmentation component height.

[0075] The first radiation cavity 61 is formed by a longitudinal gap consisting of the side plate 20 and the first-stage segmentation component 31.

[0076] The second radiation cavity 62 includes a first radiation sub-cavity 621 formed by the longitudinal gap between the first-level segmentation component 31 and the fifth-level segmentation component 35, and two first cavity groups symmetrically arranged on both sides of the first radiation sub-cavity.

[0077] The first cavity group includes a second radiating sub-cavity 622 formed by the longitudinal gap between the first-level dividing component 31 and the fourth-level dividing component 34, and two second cavity groups symmetrically arranged on both sides of the second radiating sub-cavity.

[0078] The second cavity group includes two third radiating sub-cavities 623, two fourth radiating sub-cavities 624, and two third radiating sub-cavities 623 arranged in sequence; wherein, the third radiating sub-cavities 623 are formed by the longitudinal gap between the first-level dividing component 31 and the second-level dividing component 32; the fourth radiating sub-cavities 624 are formed by the longitudinal gap between the first-level dividing component 31 and the third-level dividing component 33.

[0079] In the aforementioned radar antenna, the side plate 20 may include a first side wall 21, a second side wall 22, a third side wall 23, and a fourth side wall 24 arranged from top to bottom along the height direction.

[0080] The longitudinal gap between the first sidewall 21 and one of the sidewalls of the first-level segmentation component 31 constitutes the first radiation cavity 61.

[0081] The gaps between the second sidewall 22 and the other sidewall of the first-level dividing component 31, the sidewall of the second-level dividing component 32, the sidewall of the third-level dividing component 33, the sidewall of the fourth-level dividing component 34, and the sidewall of the fifth-level dividing component 35 constitute the first power distribution cavity 51.

[0082] The longitudinal gap between the third sidewall 23 of the two side plates 20 forms the third power distribution cavity 53.

[0083] The seventh gap between the fourth sidewall 24, the base plate 10, and the C-shaped dividing component in the dividing component constitutes the cavity of the mode conversion module 40.

[0084] The radar antenna described above can divide the area enclosed by the side plate 20 and the bottom plate 10 into multiple cavities through the multi-level segmentation component 30 and the C-type segmentation component 301, which sequentially form a mode conversion module 40, a 1-to-32 channel waveguide power divider module 50, and a waveguide radiation module 60 with 32 radiation channels. This allows the radar antenna to be applied to higher frequency bands such as U-band and V-band, as well as multi-channel antennas, reducing the implementation difficulty of high-frequency radar antennas.

[0085] In one embodiment, such as Figure 7 As shown, the radar antenna also includes a baffle 70 that is perpendicular to the side plate 20; the baffle 70 is movably connected to the side plate 20 and the dividing component 30; a plurality of limiting grooves 71 are provided on the baffle 70; the limiting grooves 71 are used to limit the side plate 20 and / or the dividing component 30.

[0086] The baffle 70, side plate 20, and dividing component 30 can be connected by screws. Through holes can be opened on the baffle 70, and threaded holes can be opened on the side plate 20 and dividing component 30 for fixing screws.

[0087] During radar antenna assembly, the baffle 70 can be first assembled and fixed to the base plate 10. Then, the side plate 20 and the dividing component are respectively placed in the corresponding limiting grooves 71, and the side plate 20, the dividing component, and the baffle are fixed. Finally, the other end of the dividing component 30 and the side plate 20 can be fixed by a cover plate or another baffle. The above-mentioned radar antenna assembly method is not limited to the above steps and other methods can also be used, which are not limited here.

[0088] The radar antenna described above can improve its assembly accuracy and ensure its performance by setting a limiting groove 71 on the baffle 70 to limit the side plate 20 and the segmented component 30.

[0089] In one embodiment, a radar antenna system is provided, which may include at least two radar antennas as shown in the above embodiment. The operating frequencies of the at least two radar antennas may be different.

[0090] For example, the aforementioned radar antenna system includes a first radar antenna and a second radar antenna. The first radar antenna can operate in the U-band, with a frequency ranging from 40 GHz to 60 GHz. The second radar antenna can operate in the V-band, with a frequency ranging from 60 GHz to 80 GHz. Different microwave signals in different operating frequency bands correspond to different wavelengths, and therefore the corresponding radar antenna sizes also differ. The size of the second radar antenna can be smaller than the size of the first radar antenna.

[0091] To facilitate the assembly of radar antennas, at least two radar antennas can be mounted on the same base.

[0092] The implementation principles and technical effects of each radar antenna in the above-described radar antenna system are similar to those in the above embodiments, and will not be repeated here. The above-described radar antenna system includes at least two radar antennas operating at different frequencies, enabling the radar system to transmit and receive signals in different frequency bands through a single device, thus improving system integration.

[0093] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A radar antenna, characterized in that, The radar antenna includes a base plate, side plates, and segmentation components. The segmentation components are disposed in the area enclosed by the base plate and side plates, and divide the area into multiple cavities. There are multiple segmentation components, including multi-level segmentation components aligned at the top. The upper-level segmentation components are symmetrically arranged on both sides of the lower-level segmentation components. The height of the upper-level segmentation components is less than the height of the lower-level segmentation components. The plurality of cavities form a mode conversion module, a waveguide power divider module, and a waveguide radiation module connected in sequence. The plurality of cavities includes a first power divider cavity constituting the waveguide power divider module and a first radiation cavity constituting the waveguide radiation module. The first power divider cavity is formed by a first gap formed by the dividing component and the side plate, and the first radiation cavity is formed by a second gap formed by the dividing component and the side plate. There are multiple dividing components. The plurality of cavities also includes a second power divider cavity, a third power divider cavity constituting the waveguide power divider module, and a second radiation cavity constituting the waveguide radiation module. The third power divider cavity is formed by a fifth gap between two side plates. The multiple segmentation components include multi-level segmentation components aligned at the top; the upper-level segmentation components are symmetrically arranged on both sides of the lower-level segmentation components; the height of the upper-level segmentation components is less than the height of the lower-level segmentation components; The multi-level segmentation components include a first-level segmentation component, a second-level segmentation component, a third-level segmentation component, a fourth-level segmentation component, and a fifth-level segmentation component arranged in ascending order of segmentation component height; the first radiation cavity is formed by the longitudinal gap between the side plate and the first-level segmentation component; The mode conversion module is used to realize the mutual conversion of microwave signals between non-plane waves and plane waves; the waveguide power divider module is used to perform amplitude and phase distribution on the plane wave output by the mode conversion module to obtain multiple microwave transmission signals, and transmit the multiple microwave transmission signals to the waveguide radiation module respectively. The side plate includes a first sidewall, a second sidewall, a third sidewall, and a fourth sidewall arranged from top to bottom along the height direction; the longitudinal gap between the first sidewall and one of the sidewalls of the first-level segmentation component constitutes the first radiation cavity; the gap between the second sidewall and the other sidewall of the first-level segmentation component, the sidewall of the second-level segmentation component, the sidewall of the third-level segmentation component, the sidewall of the fourth-level segmentation component, and the sidewall of the fifth-level segmentation component constitutes the first power distribution cavity; the longitudinal gap between the third sidewalls of the two side plates constitutes the third power distribution cavity; the seventh gap between the fourth sidewall and the bottom plate and the C-shaped segmentation component in the segmentation component constitutes the cavity of the mode conversion module.

2. The radar antenna according to claim 1, characterized in that, The second power distribution cavity is formed by a third gap consisting of the plurality of segmented components.

3. The radar antenna according to claim 2, characterized in that, The second radiation cavity includes multiple radiation sub-cavities, each formed by a sixth gap consisting of a first-level segmentation component and other level segmentation components.

4. The radar antenna according to claim 3, characterized in that, The second power distribution cavity includes a multi-level first power molecular cavity extending along the height direction, and a second power molecular cavity that connects adjacent levels of first power molecular cavities laterally; the first power molecular cavity is formed by a gap between the longitudinal sidewalls of the adjacent dividing components; the multi-level first power molecular cavities are staggered in the height direction.

5. The radar antenna according to any one of claims 3-4, characterized in that, The number of levels of the segmentation component is related to the number of power dividers in the waveguide power divider module.

6. The radar antenna according to any one of claims 3-4, characterized in that, The plurality of segmentation components also include a C-shaped segmentation component; the C-shaped segmentation component is used to divide the space between the side plate and the bottom plate into two sub-spaces connected by a C-shaped reflective surface, forming the cavity of the mode conversion module.

7. The radar antenna according to claim 1, characterized in that, The first radiation cavity is formed by the longitudinal gap between the side plate and the first-stage segmentation component; The second radiation cavity includes a first radiation sub-cavity formed by the longitudinal gap between the first-level segmentation component and the fifth-level segmentation component, and two first cavity groups symmetrically arranged on both sides of the first radiation sub-cavity; The first cavity group includes a second radiating sub-cavity formed by the longitudinal gap between the first-level segmentation component and the fourth-level segmentation component, and two second cavity groups symmetrically arranged on both sides of the second radiating sub-cavity; The second cavity group includes two third radiating sub-cavities, two fourth radiating sub-cavities, and two third radiating sub-cavities arranged in sequence; The third radiating sub-cavity is formed by the longitudinal gap between the first-level segmentation component and the second-level segmentation component; the fourth radiating sub-cavity is formed by the longitudinal gap between the first-level segmentation component and the third-level segmentation component.

8. The radar antenna according to any one of claims 1-4, characterized in that, The radar antenna also includes a baffle plate perpendicularly disposed to the side plate; the baffle plate is movably connected to the side plate and the segmentation component. The baffle has multiple limiting grooves; the limiting grooves are used to limit the side plate and / or the segmented component.

9. The radar antenna according to claim 1, characterized in that, The first end of the mode conversion module is connected to the transceiver of the radar system. The mode conversion module converts the uplink signal output by the transceiver from a non-plane wave to a plane wave, or the mode conversion module converts the received plane wave into a non-plane wave and sends the non-plane wave to the transceiver for processing through the interface with the transceiver.

10. A radar antenna system, characterized in that, The radar antenna system includes at least two radar antennas as described in any one of claims 1-9, wherein the at least two radar antennas operate at different frequencies.

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