Waveguide antenna and radar

Abstract

The waveguide antenna comprises a waveguide body, the waveguide body is provided with a waveguide cavity, the waveguide body is further provided with a waveguide radiating surface, a waveguide feed surface and a waveguide short-circuit surface, the waveguide feed surface and the waveguide short-circuit surface are oppositely arranged in the first direction, the waveguide radiating surface is located between the waveguide feed surface and the waveguide short-circuit surface, and the waveguide feed surface is located between the waveguide radiating surface and the waveguide short-circuit surface. The waveguide body is provided with a first slot and a second slot on the waveguide radiating surface, the first slot and the second slot are arranged at an interval along a second direction, the waveguide body is provided with a feed port on the waveguide feed surface, the first slot, the second slot and the feed port are all communicated with the waveguide cavity, and the waveguide radiating surface is of a non-planar structure. A preset included angle is formed between the normal direction of the first gap and the normal direction of the second gap. Through the above mode, the embodiment of the invention can expand the radiation angle of the electromagnetic wave of the waveguide radiation surface, so that the beam of the waveguide antenna radiation surface is dispersed and expanded, and the beam width of the radiation surface is increased.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of antenna technology, and in particular to a waveguide antenna and a radar. Background Art

[0002] Vehicle-mounted millimeter-wave radars are divided into forward-facing radars and corner radars. Forward-facing radars are used to detect objects in front of the vehicle, such as obstacles, vehicles, or pedestrians, and corner radars are used to detect the environment around the vehicle, such as the side area and the rear area of ​​the vehicle. In order to achieve high performance, the antenna of the vehicle-mounted millimeter-wave radar usually adopts a rectangular waveguide antenna to achieve good directivity.

[0003] In a traditional rectangular waveguide antenna, the waveguide radiation surface of the antenna is a planar structure, so that the normals of the rectangular waveguide slots on the left and right sides of the waveguide radiation surface are parallel to each other, resulting in a narrow beam width of the radiation surface (E surface). Corner radar is used to detect the environment around the vehicle, such as the side and rear areas of the vehicle body, and usually requires a wider beam width of the radiation surface (E surface). Therefore, traditional rectangular waveguide antennas are difficult to meet the wide beam requirements of corner radars. Summary of the invention

[0004] The embodiments of the present invention aim to provide a waveguide antenna and a radar, which can increase the beam width of the radiation surface.

[0005] To solve the above technical problems, a technical solution adopted in an embodiment of the present invention is: to provide a waveguide antenna, including a waveguide conductor, the waveguide conductor is provided with a waveguide cavity, the waveguide conductor is further provided with a waveguide radiation surface, a waveguide feeding surface and a waveguide short-circuit surface, the waveguide feeding surface and the waveguide short-circuit surface are arranged opposite to each other along a first direction, the waveguide radiation surface is located between the waveguide feeding surface and the waveguide short-circuit surface, the waveguide conductor is provided with a first slot and a second slot on the waveguide radiation surface, the first slot and the second slot are arranged at intervals along a second direction, the waveguide conductor is provided with a feeding port on the waveguide feeding surface, the first slot, the second slot and the feeding port are all connected to the waveguide cavity, the waveguide radiation surface is a non-planar structure, so that the normal direction of the first slot and the normal direction of the second slot are arranged at a preset angle, the first direction is perpendicular to the second direction, and the first direction and the second direction are both parallel to the waveguide radiation surface.

[0006] In some embodiments, the cross-section shape of the waveguide radiating surface along the first direction is an arc; or, the cross-section shape of the waveguide radiating surface along the first direction is a trapezoid; or, the cross-section shape of the waveguide radiating surface along the first direction is a triangle.

[0007] In some embodiments, along the first direction, a distance from a center of the first slot to the waveguide short-circuit surface is smaller than a distance from a center of the second slot to the waveguide short-circuit surface.

[0008] In some embodiments, along the first direction, the distance from the center of the first slot to the waveguide short-circuit surface is one quarter of the wavelength of the frequency of the waveguide antenna.

[0009] In some embodiments, along the second direction, the distance from the center of the first slot to the central axis of the waveguide radiating surface along the first direction is equal to the distance from the center of the second slot to the central axis of the waveguide radiating surface along the first direction.

[0010] In some embodiments, along the second direction, the distance from the center of the first slot to the central axis of the waveguide radiating surface along the first direction is one quarter of the wavelength of the frequency of the waveguide antenna.

[0011] In some embodiments, the number of the first slits is multiple, and the multiple first slits are evenly spaced along the first direction; the number of the second slits is multiple, and the multiple second slits are evenly spaced along the first direction; the multiple first slits and the multiple second slits are alternately spaced along the second direction, and the number of the first slits is equal to the number of the second slits.

[0012] In some embodiments, along the first direction, the center distance between any two adjacent first slots is half the wavelength of the frequency of the waveguide antenna; and / or, along the first direction, the center distance between any two adjacent second slots is half the wavelength of the frequency of the waveguide antenna.

[0013] In some embodiments, the waveguide antenna includes a feeding structure, the feeding structure is connected to the feeding port, and an end of the feeding structure away from the feeding port is used to be connected to a feeding source.

[0014] In order to solve the above technical problem, another technical solution adopted by an embodiment of the present invention is: providing a radar, including the above waveguide antenna.

[0015] The beneficial effects of the embodiments of the present invention are as follows: Different from the prior art, the embodiments of the present invention provide a waveguide antenna, including a waveguide conductor, the waveguide conductor is provided with a waveguide cavity, the waveguide conductor is further provided with a waveguide radiation surface, a waveguide feeding surface and a waveguide short-circuit surface, the waveguide feeding surface and the waveguide short-circuit surface are arranged opposite to each other along a first direction, the waveguide radiation surface is located between the waveguide feeding surface and the waveguide short-circuit surface, the waveguide conductor is provided with a first slot and a second slot on the waveguide radiation surface, the first slot and the second slot are arranged at intervals along the second direction, the waveguide conductor is provided with a feeding port on the waveguide feeding surface, the first slot, the second slot and the feeding port are all connected to the waveguide cavity, the waveguide radiation surface is a non-planar structure, so that the normal direction of the first slot and the normal direction of the second slot are arranged at a preset angle, the first direction is perpendicular to the second direction, and the first direction and the second direction are both parallel to the waveguide radiation surface.

[0016] In a traditional rectangular waveguide antenna, the normals of the slots on the left and right sides of the waveguide antenna are parallel to each other, and the electric field distribution of the radiation surface is symmetrical, which leads to a concentrated beam on the radiation surface of the waveguide antenna, that is, a narrow beam width. In the embodiment of the present invention, through the above method, the normal of the first slot and the normal of the second slot are set at a preset angle, that is, the normal of the first slot and the normal of the second slot are not parallel, and the radiation angle of the electromagnetic wave of the waveguide radiation surface is expanded, so that the beam of the waveguide antenna radiation surface is dispersed and expanded, and the beam width of the radiation surface is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the specific embodiments or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0018] Figure 1 FIG. 1 is a schematic diagram of the structure of the first embodiment of the waveguide antenna provided in the embodiment of the present invention. Figure 1 ;

[0019] Figure 2 FIG. 1 is a schematic diagram of the structure of the first embodiment of the waveguide antenna provided in the embodiment of the present invention. Figure 2 ;

[0020] Figure 3 is a structural schematic diagram of Embodiment 2 of a waveguide antenna provided in an embodiment of the present invention;

[0021] Figure 4 is a schematic structural diagram of a third embodiment of a waveguide antenna provided in an embodiment of the present invention;

[0022] Figure 5 1 is a gain diagram of Example 1 and a comparative example of the waveguide antenna provided in an embodiment of the present invention.

[0023] Description of reference numerals:

[0024] 1 waveguide body, 11 waveguide cavity, 12 waveguide radiation surface, 13 waveguide feeding surface, 14 waveguide short-circuit surface, 15 first slot, 16 second slot, 17 feeding port;

[0025] X first direction, Y second direction;

[0026] 100 waveguide antenna. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on another element or there can be one or more centered elements therebetween. When an element is described as "connected" to another element, it can be directly connected to another element or there can be one or more centered elements therebetween. The orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "vertical", "horizontal", etc. used in this specification is based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in this specification and in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0029] Vehicle-mounted millimeter-wave radars are divided into forward-facing radars and corner radars. Forward-facing radars are used to detect objects in front of the vehicle, such as obstacles, vehicles, or pedestrians, and corner radars are used to detect the environment around the vehicle, such as the side area and the rear area of ​​the vehicle. In order to achieve high performance, the antenna of the vehicle-mounted millimeter-wave radar usually adopts a rectangular waveguide antenna to achieve good directivity.

[0030] In a conventional rectangular waveguide antenna, the waveguide radiation surface 12 of the antenna is a planar structure, so that the normals of the rectangular waveguide slots on the left and right sides of the waveguide radiation surface 12 are parallel to each other, resulting in a narrow beam width of the radiation surface (E surface). Corner radar is used to detect the environment around the vehicle, such as the side area and rear area of ​​the vehicle body, and usually requires a wider beam width of the radiation surface (E surface). Therefore, conventional rectangular waveguide antennas are difficult to meet the wide beam requirements of corner radars.

[0031] In view of this, the present invention provides an embodiment of a waveguide antenna 100, which can increase the beam width of the radiation surface.

[0032] See also Figure 1 and Figure 2 The waveguide antenna 100 includes a waveguide conductor 1, the waveguide conductor 1 is provided with a waveguide cavity 11, the waveguide conductor 1 is also provided with a waveguide radiation surface 12, a waveguide feeding surface 13 and a waveguide short-circuit surface 14, the waveguide feeding surface 13 and the waveguide short-circuit surface 14 are arranged opposite to each other along a first direction X, the waveguide radiation surface 12 is located between the waveguide feeding surface 13 and the waveguide short-circuit surface 14, the waveguide conductor 1 is provided with a first slot 15 and a second slot 16 on the waveguide radiation surface 12, the first slot 15 and the second slot 16 are arranged at intervals along a second direction Y, the waveguide conductor 1 is provided with a feeding port 17 on the waveguide feeding surface 13, the first slot 15, the second slot 16 and the feeding port 17 are all connected to the waveguide cavity 11, the waveguide radiation surface 12 is a non-planar structure, so that the normal direction of the first slot 15 and the normal direction of the second slot 16 are arranged at a preset angle, the first direction X is perpendicular to the second direction Y, and the first direction X and the second direction Y are both parallel to the waveguide radiation surface 12.

[0033] In a conventional rectangular waveguide antenna 100, the normals of the slots on the left and right sides of the waveguide antenna 100 are parallel to each other, and the electric field distribution of the radiation surface is symmetrical, which leads to the concentrated beam of the radiation surface of the waveguide antenna 100, which propagates in a single direction, resulting in a narrow beam width. In the embodiment of the present invention, through the above method, the normal of the first slot 15 and the normal of the second slot 16 are set at a preset angle, that is, the normal of the first slot 15 and the normal of the second slot 16 are not parallel, and the radiation angle of the electromagnetic wave of the waveguide radiation surface 12 is expanded, so that the beam of the radiation surface of the waveguide antenna 100 is dispersed and expanded, propagating in a non-single direction, increasing the beam width of the radiation surface, and helping to meet the wide beam requirements of the corner radar.

[0034] For the above-mentioned waveguide radiating surface 12, in some embodiments, please refer to Figure 3, the shape of the cross section of the waveguide radiation surface 12 along the first direction X is a triangle. Wherein, when the shape of the cross section of the waveguide radiation surface 12 along the first direction X is a triangle, the waveguide radiation surface 12 includes a first plane and a second plane connected, the first plane and the second plane are arranged at a preset angle, the first slit 15 is opened in the first plane, the normal of the first slit 15 is perpendicular to the first plane, the second slit 16 is opened in the second plane, the normal of the second slit 16 is perpendicular to the second plane, the normal of the first slit 15 and the normal of the second slit 16 are arranged at a preset angle, and the angle between the normal of the first slit 15 and the normal of the second slit 16 is equal to the angle between the first plane and the second plane, and the angle range is greater than zero degrees and less than one hundred and eighty degrees. Through the above method, the radiation angle of the electromagnetic wave of the waveguide radiation surface 12 can be expanded, the radiation efficiency can be improved, and the beam width can be increased.

[0035] For the above-mentioned waveguide radiating surface 12, in some embodiments, please refer to Figure 4 , the shape of the cross section of the waveguide radiation surface 12 along the first direction X is a trapezoid. Wherein, when the shape of the cross section of the waveguide radiation surface 12 along the first direction X is a trapezoid, the waveguide radiation surface 12 includes a third plane, a fourth plane and a fifth plane connected in sequence, the third plane and the fifth plane are arranged at a preset angle, the first slit 15 is opened in the third plane, the normal of the first slit 15 is perpendicular to the third plane, the second slit 16 is opened in the fifth plane, the normal of the second slit 16 is perpendicular to the fifth plane, the normal of the first slit 15 and the normal of the second slit 16 are arranged at a preset angle, and the angle between the normal of the first slit 15 and the normal of the second slit 16 is equal to the angle between the third plane and the fifth plane, and the angle range is greater than zero and less than one hundred and eighty degrees. Through the above method, the radiation angle of the electromagnetic wave of the waveguide radiation surface 12 can be expanded, and the radiation is radiated in a wide-upper-narrow-lower form, the radiation efficiency is improved, and the beam width is preferably increased.

[0036] For the above-mentioned waveguide radiating surface 12, in some embodiments, please refer to Figure 1 and Figure 2 , the shape of the cross section of the waveguide radiation surface 12 along the first direction X is an arc. Wherein, when the shape of the cross section of the waveguide radiation surface 12 along the first direction X is a trapezoid, the waveguide radiation surface 12 includes an arc surface, the first slot 15 and the second slot 16 are arranged on the arc surface at intervals, the normal direction of the first slot 15 and the normal direction of the second slot 16 are both perpendicular to the arc surface, and the normal direction of the first slot 15 and the normal direction of the second slot 16 are arranged at a preset angle. Through the above manner, the radiation angle of the electromagnetic wave of the radiation surface can be gradually expanded, smoothly transitioned, the sudden change of the radiation angle can be reduced, the interference effect of the beam can be reduced, the radiation efficiency can be improved, and the beam width can be better.

[0037] It can be understood that the shape of the cross section of the waveguide radiating surface 12 along the first direction X includes but is not limited to a triangle, a trapezoid and an arc. For example, in some other embodiments, the shape of the cross section of the waveguide radiating surface 12 along the first direction X is a polygon or an irregular shape. The shape of the cross section of the waveguide radiating surface 12 along the first direction X can be designed according to actual needs.

[0038] For the first gap 15 and the second gap 16, see Figure 1 and Figure 2 , along the first direction X, the distance from the center of the first slot 15 to the waveguide short-circuit surface 14 is smaller than the distance from the center of the second slot 16 to the waveguide short-circuit surface 14. Among them, the shorter distance from the center of the first slot 15 to the waveguide short-circuit surface 14 can improve the propagation speed of the electromagnetic wave of the first slot 15 and increase the energy density of the electromagnetic wave of the first slot 15, which is helpful to improve the response speed of the waveguide antenna 100; the longer distance from the center of the second slot 16 to the waveguide short-circuit surface 14 can extend the propagation path of the electromagnetic wave of the second slot 16, which is helpful to improve the effective distance of the waveguide antenna 100. In addition, the difference between the distance from the center of the first slot 15 to the waveguide short-circuit surface 14 and the distance from the center of the second slot 16 to the waveguide short-circuit surface 14 can avoid the electromagnetic waves of the first slot 15 and the electromagnetic waves of the second slot 16 from interfering with each other and causing distortion, which is helpful to improve the radiation quality of the waveguide antenna 100.

[0039] For the first slot 15, in some embodiments, along the first direction X, the distance from the center of the first slot 15 to the waveguide short-circuit surface 14 is one-quarter wavelength of the frequency of the waveguide antenna 100. The distance from the center of the first slot 15 to the waveguide short-circuit surface 14 is one-quarter wavelength of the frequency of the waveguide antenna 100, which enables the waveguide antenna 100 to achieve resonance at this distance, so that the oscillation frequency of the waveguide antenna 100 matches the frequency of the input signal, maximizes the reception or radiation of electromagnetic waves, and improves the transmission efficiency of the waveguide antenna 100.

[0040] It can be understood that the distance from the center of the first slot 15 to the waveguide short-circuit surface 14 includes but is not limited to one-quarter wavelength of the frequency of the waveguide antenna 100. For example, in some other embodiments, the distance from the center of the first slot 15 to the waveguide short-circuit surface 14 is one-third wavelength or one-half wavelength of the frequency of the waveguide antenna 100. The ratio between the distance from the center of the first slot 15 to the waveguide short-circuit surface 14 and the wavelength of the frequency of the waveguide antenna 100 can be designed according to actual needs.

[0041] For the first gap 15 and the second gap 16, please refer to Figure 1 and Figure 2, along the second direction Y, the distance from the center of the first slot 15 to the central axis of the waveguide radiation surface 12 along the first direction X is equal to the distance from the center of the second slot 16 to the central axis of the waveguide radiation surface 12 along the first direction X. Wherein, by making the distance from the center of the first slot 15 to the central axis of the waveguide radiation surface 12 along the first direction X equal to the distance from the center of the second slot 16 to the central axis of the waveguide radiation surface 12 along the first direction X, the beam intensity distribution of the waveguide antenna 100 can be uniform, and the uneven beam intensity or distortion of the waveguide antenna 100 caused by asymmetry can be avoided, which helps to improve the stability and radiation quality of the waveguide antenna 100.

[0042] For the first slot 15, in some embodiments, along the second direction Y, the distance from the center of the first slot 15 to the central axis of the waveguide radiation surface 12 along the first direction X is one quarter wavelength of the frequency of the waveguide antenna 100. The distance from the center of the first slot 15 to the central axis of the waveguide radiation surface 12 along the first direction X is one quarter wavelength of the frequency of the waveguide antenna 100, which can correspond to the distance from the first slot 15 to the waveguide short-circuit surface 14 being one quarter wavelength of the frequency of the waveguide antenna 100, and can reduce the mutual interference and distortion of electromagnetic waves between the first slot 15 and the second slot 16 while maintaining good radiation performance of the first slot 15.

[0043] For the first gap 15 and the second gap 16, in some embodiments, please refer to Figure 1 and Figure 2 , the number of the first slots 15 is multiple, and the multiple first slots 15 are evenly spaced along the first direction X; the number of the second slots 16 is multiple, and the multiple second slots 16 are evenly spaced along the first direction X; the multiple first slots 15 and the multiple second slots 16 are alternately spaced along the second direction Y, and the number of the first slots 15 is equal to the number of the second slots 16. Among them, by alternately arranging the multiple first slots 15 and the multiple second slots 16, not only can the frequency response of the waveguide antenna 100 in different frequency bands be optimized and the radiation efficiency of the waveguide antenna 100 be improved, but also the interference effect generated between the first slots 15 and the second slots 16 can be reduced, thereby improving the radiation quality of the waveguide antenna 100.

[0044] For the first slots 15 and the second slots 16, in some embodiments, along the first direction X, the center distance between any two adjacent first slots 15 is half the wavelength of the frequency of the waveguide antenna 100; and / or, along the first direction X, the center distance between any two adjacent second slots 16 is half the wavelength of the frequency of the waveguide antenna 100. In the above manner, the distance between the plurality of first slots 15 and the distance between the plurality of second slots 16 can be moderate, and the distance can be avoided from being too narrow or too wide, which not only reduces the mutual interference between the plurality of first slots 15 and the mutual interference between the plurality of second slots 16, avoids signal distortion, improves signal quality, but also maintains good coupling between the plurality of first slots 15 and the plurality of second slots 16.

[0045] For the above-mentioned waveguide antenna 100 , the waveguide antenna 100 includes a feeding structure, the feeding structure is connected to the feeding port 17 , and one end of the feeding structure away from the feeding port 17 is used to be connected to a feeding source.

[0046] It can be understood that the feeding structure includes but is not limited to waveguide feeding, microstrip line feeding and coaxial cable feeding, and the feeding structure can be designed according to actual needs.

[0047] In order to verify the concept of the waveguide antenna 100 of the embodiment of the present invention, a simulation example of the waveguide antenna 100 is provided below:

[0048] First, see Figure 1 and Figure 2, the structure of the waveguide antenna 100 of an embodiment of the present invention is provided, which is specifically as follows: the waveguide antenna 100 includes a waveguide conductor 1, the waveguide conductor 1 is provided with a waveguide cavity 11, the waveguide conductor 1 is also provided with a waveguide radiation surface 12, a waveguide feeding surface 13 and a waveguide short-circuit surface 14, the waveguide feeding surface 13 and the waveguide short-circuit surface 14 are arranged opposite to each other along a first direction X, the waveguide radiation surface 12 is located between the waveguide feeding surface 13 and the waveguide short-circuit surface 14, the waveguide conductor 1 is provided with a first slot 15 and a second slot 16 on the waveguide radiation surface 12, and the first slot The slots 15 and the second slots 16 are arranged at intervals along the second direction Y, the number of the first slots 15 and the number of the second slots 16 are both twelve, the twelve first slots 15 are arranged at intervals along the first direction X, the twelve second slots 16 are arranged at intervals along the first direction X, in the first direction X, the center distance between any two adjacent first slots 15 is half the wavelength of the frequency of the waveguide antenna 100, the center distance between any two adjacent second slots 16 is half the wavelength of the frequency of the waveguide antenna 100, and the waveguide 1 is at the waveguide 100. The feed surface 13 is provided with a feed port 17, the first slot 15, the second slot 16 and the feed port 17 are all connected to the waveguide cavity 11, the waveguide radiation surface 12 is an arc surface, the normal direction of the first slot 15 and the normal direction of the second slot 16 are arranged at a preset angle, along the first direction X, the distance from the center of the first slot 15 to the waveguide short-circuit surface 14 is less than the distance from the center of the second slot 16 to the waveguide short-circuit surface 14, the distance from the center of the first slot 15 to the waveguide short-circuit surface 14 is one quarter wavelength of the frequency of the waveguide antenna 100, along In the second direction Y, the distance from the center of the first slot 15 to the central axis of the waveguide radiation surface 12 along the first direction X is equal to the distance from the center of the second slot 16 to the central axis of the waveguide radiation surface 12 along the first direction X, the distance from the center of the first slot 15 to the central axis of the waveguide radiation surface 12 along the first direction X is one quarter wavelength of the frequency of the waveguide antenna 100, the length of the waveguide cavity 11 is one half wavelength of the frequency of the waveguide antenna 100, and the width of the waveguide cavity 11 is four fifths wavelength of the frequency of the waveguide antenna 100.

[0049] Secondly, the structure of a comparative waveguide antenna is provided, which is specifically as follows: the waveguide antenna includes a waveguide conductor, the waveguide conductor is provided with a waveguide cavity, the waveguide conductor is further provided with a waveguide radiation surface, a waveguide feeding surface and a waveguide short-circuit surface, the waveguide feeding surface and the waveguide short-circuit surface are arranged opposite to each other along a first direction X, the waveguide radiation surface is located between the waveguide feeding surface and the waveguide short-circuit surface, the waveguide conductor is provided with a first slot and a second slot on the waveguide radiation surface, the first slot and the second slot are arranged at intervals along the second direction Y, the number of the first slots and the number of the second slots are both twelve, the twelve first slots are arranged at intervals along the first direction X, the twelve second slots are arranged at intervals along the first direction X, in the first direction X, the center distance between any two adjacent first slots is half the wavelength of the frequency of the waveguide antenna, the center distance between any two adjacent second slots is half the wavelength of the frequency of the waveguide antenna, and the waveguide conductor is arranged at The waveguide feeding surface 13 is provided with a feeding port, the first slot, the second slot and the feeding port are all connected to the waveguide cavity, the waveguide radiation surface is a plane, the normal of the first slot is parallel to the normal of the second slot, along the first direction X, the distance from the center of the first slot to the waveguide short-circuit surface is less than the distance from the center of the second slot to the waveguide short-circuit surface, the distance from the center of the first slot to the waveguide short-circuit surface is one-quarter wavelength of the frequency of the waveguide antenna, along the second direction Y, the distance from the center of the first slot to the central axis of the waveguide radiation surface along the first direction X is equal to the distance from the center of the second slot to the central axis of the waveguide radiation surface along the first direction X, the distance from the center of the first slot to the central axis of the waveguide radiation surface along the first direction X is one-quarter wavelength of the frequency of the waveguide antenna, the length of the waveguide cavity is one-half wavelength of the frequency of the waveguide antenna, and the width of the waveguide cavity is four-fifths wavelength of the frequency of the waveguide antenna.

[0050] Finally, see Figure 5 , provides a gain diagram of the simulation results of the embodiment of the present invention and the comparative example, wherein the dotted line is the gain of the embodiment of the present invention, and the solid line is the gain of the comparative example, Figure 5 It can be seen that in the embodiment of the present invention, the angle range of the beam width greater than 5dB is ±82°, and in the comparative example, the angle range of the beam width greater than 5dB is ±54°. Compared with the two, in the embodiment of the present invention, the angle greater than 5dB beam width is expanded by 56°. Therefore, the waveguide antenna 100 in the embodiment of the present invention can increase the beam width of the radiation surface and meet the wide beam requirement of the corner radar.

[0051] An embodiment of the present invention provides a waveguide antenna 100, including a waveguide conductor 1, wherein the waveguide conductor 1 is provided with a waveguide cavity 11, and the waveguide conductor 1 is further provided with a waveguide radiation surface 12, a waveguide feeding surface 13 and a waveguide short-circuit surface 14, wherein the waveguide feeding surface and the waveguide short-circuit surface 14 are arranged opposite to each other along a first direction X, and the waveguide radiation surface 12 is located between the waveguide feeding surface and the waveguide short-circuit surface 14, and the waveguide conductor 1 is provided with a first slot 15 and a second slot 16 on the waveguide radiation surface 12, and the first slot 15 and the second slot 16 are arranged at intervals along a second direction Y, and the waveguide conductor 1 is provided with a feeding port 17 on the waveguide feeding surface, and the first slot 15, the second slot 16 and the feeding port 17 are all connected to the waveguide cavity 11, and the waveguide radiation surface 12 is a non-planar structure, so that the normal direction of the first slot 15 and the normal direction of the second slot 16 are arranged at a preset angle, the first direction X is perpendicular to the second direction Y, and the first direction X and the second direction Y are both parallel to the waveguide radiation surface 12.

[0052] In a conventional rectangular waveguide antenna 100, the normals of the slots on the left and right sides of the waveguide antenna 100 are parallel to each other, and thus the electric field distribution of the radiation surface is symmetrical, which results in a concentrated beam on the radiation surface of the waveguide antenna 100, i.e., a narrow beam width. In the embodiment of the present invention, through the above-mentioned method, the normal of the first slot 15 and the normal of the second slot 16 are set at a preset angle, i.e., the normal of the first slot 15 and the normal of the second slot 16 are not parallel, and thus the radiation angle of the electromagnetic wave of the waveguide radiation surface 12 is expanded, so that the beam of the radiation surface of the waveguide antenna 100 is dispersed and expanded, and the beam width of the radiation surface is increased.

[0053] The present invention further provides an embodiment of a radar, the radar comprising the waveguide antenna 100. The specific structure and function of the waveguide antenna 100 may refer to the above embodiments, which will not be described in detail herein.

[0054] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A waveguide antenna, characterized in that: The invention comprises a waveguide conductor, wherein the waveguide conductor is provided with a waveguide cavity, the waveguide conductor is further provided with a waveguide radiation surface, a waveguide feeding surface and a waveguide short-circuit surface, the waveguide feeding surface and the waveguide short-circuit surface are arranged opposite to each other along a first direction, the waveguide radiation surface is located between the waveguide feeding surface and the waveguide short-circuit surface, the waveguide conductor is provided with a first slot and a second slot on the waveguide radiation surface, the first slot and the second slot are arranged at intervals along a second direction, the waveguide conductor is provided with a feeding port on the waveguide feeding surface, the first slot, the second slot and the feeding port are all connected to the waveguide cavity, the waveguide radiation surface is a non-planar structure, so that the normal direction of the first slot and the normal direction of the second slot are arranged at a preset angle, the first direction is perpendicular to the second direction, and the first direction and the second direction are both parallel to the waveguide radiation surface.

2. The waveguide antenna according to claim 1, characterized in that: The cross-section of the waveguide radiation surface along the first direction is in an arc shape; or, The cross-section of the waveguide radiation surface along the first direction is a trapezoid; or, The cross-section of the waveguide radiation surface along the first direction is in a triangular shape.

3. The waveguide antenna according to claim 1, characterized in that: Along the first direction, a distance from a center of the first slot to the waveguide short-circuit surface is smaller than a distance from a center of the second slot to the waveguide short-circuit surface.

4. The waveguide antenna according to claim 3, characterized in that: Along the first direction, the distance from the center of the first slot to the waveguide short-circuit surface is one quarter of the wavelength of the frequency of the waveguide antenna.

5. The waveguide antenna according to claim 1, characterized in that: Along the second direction, a distance from the center of the first slot to the central axis of the waveguide radiating surface along the first direction is equal to a distance from the center of the second slot to the central axis of the waveguide radiating surface along the first direction.

6. The waveguide antenna according to claim 5, characterized in that: Along the second direction, a distance from the center of the first slot to a central axis of the waveguide radiation surface along the first direction is one quarter of a wavelength of a frequency of the waveguide antenna.

7. The waveguide antenna according to claim 1, characterized in that: There are a plurality of first slits, and the plurality of first slits are evenly spaced along the first direction; There are a plurality of second slits, and the plurality of second slits are evenly spaced along the first direction; A plurality of the first slits and a plurality of the second slits are alternately arranged along the second direction, and the number of the first slits is equal to the number of the second slits.

8. The waveguide antenna according to claim 7, characterized in that: Along the first direction, the center distance between any two adjacent first slots is half the wavelength of the frequency of the waveguide antenna; and / or, Along the first direction, the center distance between any two adjacent second slots is half the wavelength of the frequency of the waveguide antenna.

9. The waveguide antenna according to any one of claims 1 to 8, characterized in that: The waveguide antenna comprises a feeding structure, the feeding structure is connected to the feeding port, and an end of the feeding structure away from the feeding port is used to be connected to a feeding source.

10. A radar, characterized in that: Comprising a waveguide antenna as claimed in any one of claims 1 to 9.

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