An antenna cover and radar device

Abstract

The application provides an antenna cover and a radar device, comprising: a cover body, an included angle between a side wall of the cover body and an opening surface of a bottom of the cover body is 25-35 degrees, and a cross section of the cover body is tapered along a direction away from the opening surface of the bottom; a recess structure has a plurality of groove units, the plurality of groove units are arranged in an array on an inner side wall of the cover body, and can cover a field of view range of an antenna chip to diverge a beam of the antenna chip. In this way, the groove units can reduce reflection loss of the beam of the antenna chip, and can also make the beam of the antenna chip diverge in the groove units, so that the beam emitted by the antenna chip from the antenna cover is widened, an incident angle of the beam of the antenna chip formed on the side wall of the cover body is small, a propagation path of the beam of the antenna chip inside the side wall of the cover body is short, energy loss is small, and thus the detection distance and the field of view angle of the radar device can be improved.

Description

Technical Field

[0001] This application relates to the field of radar product technology, specifically to an antenna radome and radar device. Background Technology

[0002] As an advanced sensor technology, radar plays a vital role in the automotive field due to its high resolution, high precision, and all-weather operation capabilities. In automotive applications, radar is typically installed on the front and rear bumpers of vehicles to enable functions such as adaptive cruise control, collision warning systems, and blind spot detection.

[0003] As vehicles become more feature-rich, radar is now often installed at the bottom of the vehicle to effectively detect and warn of animals or children lingering there. It can also be expanded to detect kicking motions from under the rear of the vehicle, enabling a "kick-to-open trunk" function. However, traditional radar devices have a relatively narrow field of view, which is insufficient for detecting the area under the vehicle. Installing a single radar device at the bottom of the vehicle results in a large blind spot and incomplete detection capabilities; installing multiple radars complicates the structure, makes control cumbersome, and can interfere with the installation of other components. Utility Model Content

[0004] In view of this, this application provides an antenna radome and radar device that can improve the detection range and field of view of the radar device.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] An antenna radome for a radar device, comprising:

[0007] The cover has a side wall that forms an angle of 25-35 degrees with the bottom opening of the cover, and the cross-section of the cover gradually tapers away from the bottom opening.

[0008] The recessed structure has multiple groove units arranged in an array on the inner sidewall of the cover, which can cover the field of view of the antenna chip to diverge the beam of the antenna chip.

[0009] When applied to radar devices, the beam emitted by the antenna chip first passes through a recessed structure. The recessed unit reduces the reflection loss of the antenna chip's beam and allows the beam to diverge within the recessed unit, thus broadening the beam emitted by the antenna chip from the radome. Finally, the antenna chip's beam is transmitted through the side wall of the radome. Since the side wall of the radome forms an angle with the bottom opening of the radome, the incident angle of the antenna chip's beam on the side wall of the radome is small, and the propagation path of the antenna chip's beam inside the side wall of the radome is short, resulting in less energy loss. This, in turn, can improve the detection range and field of view of the radar device.

[0010] In one optional embodiment, the shroud has two opposing first sidewalls and two opposing second sidewalls, which are alternately arranged circumferentially along the shroud. The included angle formed by the two first sidewalls and the two second sidewalls is 110-130 degrees. By setting the shroud to the shape of a pyramid or frustum, it is easy to manufacture and design, and the structure is stable and reliable. When applied to a radar device, the beam emitted by the antenna chip in the radar device is transmitted through the first and second sidewalls. The incident angle formed by the antenna chip beam on the first and second sidewalls is small, and the propagation path of the antenna chip beam inside the first and second sidewalls is short, resulting in less energy loss. This can improve the detection range and field of view of the radar device.

[0011] In one optional embodiment, the first sidewall and the second sidewall are transitioned by an arc surface, the radius of which is set to 5-20 mm. Since the sharp edges on the cover affect the beam transmission and propagation of the antenna chip, an arc surface is provided between the first and second sidewalls to allow for a smooth transition, thereby eliminating the sharp edges between them.

[0012] In one optional embodiment, the wall thickness of the enclosure is set to T, the relative permittivity of the enclosure material is ε, the maximum incident angle of the antenna chip beam on the enclosure is θ, and the wavelength of the antenna chip beam is λ, satisfying T=n*λ / 2*√(ε-〖sinθ〗^2), where n is a positive integer greater than zero. By designing the wall thickness of the enclosure to match the wall thickness with the enclosure material, the wavelength of the antenna chip beam, and the maximum incident angle of the antenna chip on the enclosure, the absorption loss of the antenna chip beam within the enclosure can be minimized.

[0013] In one optional embodiment, the wall thickness of the cover is set to 1.5-2.5 mm. Since the inner surface of the cover has a recessed structure, multiple groove units need to be created. By designing the wall thickness of the cover, both good structural strength and reduced absorption loss can be achieved.

[0014] In one optional embodiment, the depth of the groove unit is set to D, and the wavelength of the antenna chip beam is λ, satisfying 4≤λ / D≤8.

[0015] In one optional embodiment, the depth of the groove unit is set to 0.6-0.9 mm. By designing the depth of the groove unit, it is possible to better disperse the beam of the antenna chip and reduce beam reflection and refraction loss.

[0016] In one optional embodiment, the sidewall of the groove unit is perpendicular to the bottom opening surface of the cover. The groove opening of each groove unit faces the same direction as the bottom opening of the cover, which can greatly reduce the complexity of mold demolding and improve processing efficiency during the processing.

[0017] In one optional embodiment, the projection dimensions of any two adjacent groove units on the bottom opening surface of the shroud are identical, and the projections of the plurality of groove units on the opening surface of the shroud are uniformly arranged. This allows the plurality of groove units to be evenly distributed on the inner surface of the shroud. Through the orderly distribution of the groove units, the beam transmitted from the antenna chip by the shroud is made uniform and orderly, thus facilitating beam reception by the subsequent antenna chip and simplifying signal analysis and processing, reducing computational complexity.

[0018] In one optional embodiment, the projection of the groove unit onto the bottom opening surface of the cover is square, and the side length of the projection of the groove unit onto the bottom opening surface of the cover is set to 0.8-1.2 mm. By designing the dimensions of the groove unit, it is possible to better disperse the beam of the antenna chip and reduce the reflection of the antenna chip beam, thereby reducing refraction loss.

[0019] In one alternative embodiment, the wavelength of the antenna chip beam is λ, and the center-to-center distance between the projections of two adjacent groove units on the bottom opening surface of the cover is λ / 2.

[0020] In one alternative embodiment, the center-to-center distance between the projections of two adjacent groove units on the bottom opening surface of the cover is 2-2.4 mm.

[0021] By designing the spacing between two adjacent groove units, the groove units can better disperse the beam of the antenna chip and reduce the reflection of the antenna chip beam, thereby reducing refraction loss.

[0022] A radar device includes an radome as described in any of the preceding claims. In use, the beam emitted by the antenna chip first passes through a recessed structure. The recessed unit reduces the reflection loss of the antenna chip's beam and allows the beam to diverge within the recessed unit, thus broadening the beam emitted by the antenna chip from the radome. Finally, the beam of the antenna chip is transmitted through the sidewall of the radome. Because the sidewall of the radome forms an angle with the bottom opening of the radome, the incident angle of the antenna chip's beam on the sidewall of the radome is small, resulting in a shorter propagation path of the antenna chip's beam inside the sidewall of the radome and less energy loss. This, in turn, improves the detection range and field of view of the radar device. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 An exploded view of a radar device shown for some embodiments of this application;

[0025] Figure 2 A schematic diagram of the outer surface of the radome shown for some embodiments of this application;

[0026] Figure 3 A schematic diagram of the inner surface of the radome shown for some embodiments of this application;

[0027] Figure 4 Bottom view of the radome shown for some embodiments of this application;

[0028] Figure 5 A cross-sectional view of an antenna radome shown for some embodiments of this application;

[0029] Figure 6 A schematic diagram of the beam of a radar device shown for some embodiments of this application;

[0030] Figure 7 The diagram illustrates the energy loss trend of a radar device for some embodiments of this application.

[0031] Explanation of reference numerals in the attached drawings: 1. Antenna radome; 2. Antenna chip; 3. Circuit board; 4. Shielding cover; 5. Housing; 6. Connector; 11. First sidewall; 12. Second sidewall; 13. Arc surface; 14. Bottom opening surface; 15. Groove unit; 16. Projection unit. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] like Figures 1-7 As shown in the illustration, this application provides an antenna radome 1 for a radar device, comprising a radome body and a recessed structure. The bottom of the radome body has an opening for connection to the housing 5 of the radar device, forming external protection for the radar device. The antenna chip 2 of the radar device is disposed inside the housing 5 and the antenna radome 1. The angle between the sidewall of the radome body and the bottom opening surface 14 is 25-35 degrees. Furthermore, the cross-section of the radome body tapers away from the bottom opening surface 14, so that the shape of the radome body is conical or frustum-shaped. When applied to a radar device, the beam emitted by the antenna chip 2 in the radar device is transmitted through the radome body. Because the sidewall of the radome body forms an angle with the bottom opening surface 14, the incident angle of the beam of the antenna chip 2 on the sidewall of the radome body is small, and the propagation path of the beam of the antenna chip 2 inside the sidewall of the radome body is short, resulting in less energy loss. This improves the detection range and field of view of the radar device.

[0034] Understandably, the traditional radome 1 is a horizontal cover plate. The incident angle of the antenna chip 2 beam formed on the cover plate is relatively large, and the propagation path of the antenna chip 2 beam inside the cover plate is relatively long, resulting in greater energy loss, which limits the detection range and field of view of the radar device.

[0035] The recessed structure is disposed on the inner sidewall of the radome, specifically on the inner surface of the aforementioned sidewall of the radome. The radome has a transmission area for the antenna chip 2 to transmit through, and the recessed structure at least covers this transmission area (i.e., the recessed area covers the field of view of the antenna chip 2), so that the beam of the antenna chip 2 passes through the recessed structure before passing through the radome. The recessed structure includes multiple groove units 15 arranged in an array. Each groove unit 15 is disposed on the inner sidewall of the radome and is recessed relative to the inner sidewall of the radome. When applied to a radar device, the beam emitted by the antenna chip 2 first passes through the recessed structure. The groove units 15 reduce the reflection loss of the antenna chip 2's beam and simultaneously allow the beam of the antenna chip 2 to diverge within the groove units 15, thus broadening the beam emitted by the antenna chip 2 from the radome 1. Finally, the beam of the antenna chip 2 is transmitted through the sidewall of the radome, thereby improving the field of view angle of the radar device.

[0036] In this embodiment, as Figure 2As shown, the enclosure has two opposing first sidewalls 11 and two opposing second sidewalls 12. The first sidewalls 11 are connected between the two second sidewalls 12, and the second sidewalls 12 are connected between the two first sidewalls 11, so that the two first sidewalls 11 and the two second sidewalls 12 are alternately arranged in the circumferential direction of the enclosure. Here, the shape of the enclosure can be set as a pyramid or a frustum, for example, the shape of the enclosure can be set as a square pyramid. The included angle formed by the two first sidewalls 11 is 110-130 degrees, preferably 120 degrees. The included angle formed by the two second sidewalls 12 is 110-130 degrees, preferably 120 degrees. That is, the included angle formed by the first sidewalls 11 and the second sidewalls 12 with respect to the bottom opening surface 14 of the enclosure is 25-35 degrees, preferably 30 degrees. Moreover, the included angle opening formed by the two first sidewalls 11 and the included angle opening formed by the two second sidewalls 12 both face the antenna chip 2. Thus, by setting the radome to the shape of a pyramid or frustum, it is easy to process and design, and the structure is stable and reliable. When applied to a radar device, the beam emitted by the antenna chip 2 in the radar device is transmitted through the first sidewall 11 and the second sidewall 12. The incident angle formed by the beam of the antenna chip 2 on the first sidewall 11 and the second sidewall 12 is small, and the propagation path of the beam of the antenna chip 2 inside the first sidewall 11 and the second sidewall 12 is short, resulting in less energy loss. This can improve the detection range and field of view of the radar device.

[0037] Since the sharp edges on the cover will affect the beam transmission and propagation of the antenna chip 2, an arc surface 13 is provided between the first sidewall 11 and the second sidewall 12 to allow the first sidewall 11 and the second sidewall 12 to transition through the arc surface 13, thereby eliminating the sharp edges between the first sidewall 11 and the second sidewall 12. The radius of the arc surface 13 between the first sidewall 11 and the second sidewall 12 is 5-20 mm, that is, the curvature range of the arc surface 13 is R5mm to R20mm.

[0038] In addition, the intersection of the two first sidewalls 11 and the two second sidewalls 12 is transitioned by a spherical surface to eliminate the sharp edges of the top of the enclosure.

[0039] The antenna chip 2 in the radar device will generate energy loss in the path of penetrating the side wall of the radome 1. This energy loss includes absorption loss and refraction loss. The absorption loss is proportional to the wall thickness of the radome 1. That is, the greater the wall thickness of the radome 1 made of the same material, the greater the absorption loss. In order to reduce the absorption loss of the beam of the antenna chip 2 in the radome, in this embodiment, the wall thickness of each position on the radome 1 is equal and is T. The relative permittivity of the material used in the radome is ε. The maximum incident angle of the beam of the antenna chip 2 on the radome is θ. The wavelength of the beam of the antenna chip 2 is λ, which satisfies T=n*λ / 2*√(ε-〖sinθ〗^2), where n is a positive integer greater than zero. In practical applications, n can be either 1 or 2; λ = c / f, where c is the speed of light and f is the operating frequency of antenna chip 2. For example, if the operating frequency of antenna chip 2 is 77 GHz, the wavelength λ of the antenna chip 2's beam is approximately 3.9 mm. The material of the shroud is set to plastic, preferably a material with high dielectric constant and low loss, which can reduce electromagnetic wave scattering and thus increase the beamwidth. For example, ε ranges from 2 to 5, and here it is preferably 3.5. The field of view of the traditional antenna chip 2 is ±60 degrees. Considering that the angle between the side wall of the shroud and the bottom opening 14 is 30 degrees, the maximum incident angle of the antenna chip 2's beam on the shroud is 30 degrees, i.e., θ = 30 degrees. Substituting into the formula, when n = 1, the optimal wall thickness is T = 1 * 3.9 / 2 * √(3.5 - [0.5]^2) = 1.08 mm. When n=2, the optimal wall thickness is T=2*3.9 / 2*√(3.5-〖0.5〗^2)=2.16mm.

[0040] In the specific design, the wall thickness of the cover is set to 1.5-2.5 mm. Since the inner surface of the cover has a recessed structure, multiple groove units 15 need to be opened. By designing the wall thickness of the cover, the cover can have good structural strength and reduce absorption loss.

[0041] The depth of the recessed unit 15 is set to D, and the wavelength of the antenna chip 2's beam is λ, satisfying 4 ≤ λ / D ≤ 8. Wherein, the wavelength λ of the antenna chip 2's beam is approximately 3.9 mm. Substituting these values ​​into the formula, the depth D of the recessed unit 15 is calculated to be 0.487 mm - 0.975 mm. Thus, by designing the depth of the recessed unit 15, it is possible to better disperse the beam of the antenna chip 2, reduce beam reflection, and decrease refraction loss.

[0042] In practical applications, in order to facilitate the processing of the recessed structure, the depth of the groove unit 15 is set to 0.6-0.9 mm.

[0043] In some embodiments of this application, the sidewall of each groove unit 15 is perpendicular to the bottom opening surface 14 of the cover, that is, the groove opening of each groove unit 15 is aligned with the bottom opening of the cover. During the processing, the complexity of mold demolding can be greatly reduced and the processing efficiency can be improved.

[0044] The projection of the recessed structure onto the bottom opening surface 14 of the radome consists of multiple projection units 16. Each projection unit 16 corresponds to one groove unit 15, meaning there is a one-to-one correspondence between the multiple groove units 15 and the multiple projection units 16. The projection units 16 are evenly distributed, meaning the spacing between any two adjacent projection units 16 is consistent. Furthermore, the size and shape of any two adjacent projection units 16 are identical. This allows the multiple groove units 15 to be evenly distributed on the inner surface of the radome. The orderly distribution of the groove units 15 ensures that the beam transmitted from the antenna chip 2 by the radome 1 is uniform and orderly, facilitating beam reception by the antenna chip 2 and simplifying signal analysis and processing, thus reducing computational complexity.

[0045] The projection unit 16 of the groove unit 15 onto the bottom opening surface 14 of the radome is square in shape. This square can be either a square or a rectangle, but a square is preferred here. Since the four sides of a square are of equal length, it is convenient to design the size parameters of the groove unit 15, and it can also improve the beam consistency of the radar device in four directions. Specifically, the side length of the projection of the groove unit 15 onto the bottom opening surface 14 of the radome is set to 0.8-1.2 mm. Considering that the wavelength λ of the antenna chip 2's beam is approximately 3.9 mm, by designing the size of the groove unit 15, the groove unit 15 can better disperse the beam of the antenna chip 2, reduce the reflection of the antenna chip 2's beam, and reduce refraction loss.

[0046] The wavelength of the beam of the antenna chip 2 is λ. The center spacing of the projection units 16 of two adjacent groove units 15 on the bottom opening surface 14 of the cover is λ / 2, so that the distribution pattern of the groove units 15 is related to the wavelength of the beam of the antenna chip 2. This allows the groove units 15 to better disperse the beam of the antenna chip 2, thereby improving the detection range and field of view of the radar device.

[0047] In practical applications, considering that the wavelength λ of the antenna chip 2's beam is approximately 3.9 mm, the center-to-center distance between the projection units 16 on the bottom opening surface 14 of the cover of two adjacent groove units 15 is 2-2.4 mm. In the two adjacent projection units 16, the distance between the center of one projection unit 16 and the center of the other projection unit 16 is 2-2.4 mm. By designing the distance between the two adjacent groove units 15, the groove units 15 can better disperse the beam of the antenna chip 2 and reduce the reflection of the antenna chip 2's beam, thereby reducing refraction loss.

[0048] It is understood that the bottom opening of the cover is preferably rectangular, and the multiple projection units 16 formed on the bottom opening surface 14 by the recessed structure are distributed in a matrix. The arrangement direction of the projection units 16 is parallel or perpendicular to the side length of the bottom opening, and the side length of each projection unit 16 is parallel or perpendicular to the side length of the bottom opening. In this way, more and more groove units 15 can be distributed on the inner surface of the cover, which is convenient for processing.

[0049] like Figure 7 As shown, combining the features of the radome 1 in the above embodiments, the radome 1 is applied to a radar device for simulation. The beam emitted by the antenna chip 2 passes through the recessed structure and is then transmitted out by the radome. The energy loss of the beam at large angles can be reduced to a reasonable range that can be used to detect targets. With a typical loss of less than 10dB, this wide beam can be widened from ±60 degrees to ±85 degrees compared to a conventional beam.

[0050] This application provides a radar device, including an radome 1, an antenna chip 2, a circuit board 3, a shielding cover 4, a housing 5, and a connector 6. The housing 5 and the radome 1 are assembled to form the external protection of the radar device. The connector 6 can be a separate independent part or an integrated structure with the housing 5. The shielding cover 4 is made of stamped or die-cast metal and is located between the circuit board 3 and the housing 5, providing electromagnetic shielding. The antenna chip 2 is mounted on the circuit board 3. The antenna chip 2 provides the radar device with an internal beam field of view: a horizontal field of view of ±60 degrees and an elevation field of view of ±60 degrees. The circuit board 3 is located behind the radome 1, and the antenna chip 2 mounted on the circuit board 3 transmits and receives beams towards the radome 1. The radome 1 is the same as the one described in the above embodiment.

[0051] Thus, when the radar device is in use, the beam emitted by the antenna chip 2 first passes through the recessed structure. The recessed unit 15 can reduce the reflection loss of the antenna chip 2 beam and at the same time, it can make the beam of the antenna chip 2 diverge within the recessed unit 15, so that the beam emitted by the antenna chip 2 from the radome 1 is broadened. Finally, the beam of the antenna chip 2 is transmitted through the side wall of the radome. Since the side wall of the radome forms an angle with the bottom opening surface 14 of the radome, the incident angle formed by the beam of the antenna chip 2 on the side wall of the radome is small, the propagation path of the beam of the antenna chip 2 inside the side wall of the radome is short, and the energy loss is small, thereby improving the detection range and field of view of the radar device.

[0052] Furthermore, for other beneficial effects brought about by the radome 1, please refer to the above description of the radome 1, which will not be repeated here.

[0053] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0054] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0055] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0056] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0057] It should be understood that the qualifiers “first,” “second,” “third,” “fourth,” “fifth,” and “sixth” used in the description of the embodiments of this application are only used to more clearly illustrate the technical solutions and are not intended to limit the scope of protection of this application.

[0058] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A radome for a radar device, characterized in that, include: The cover has a side wall that forms an angle of 25-35 degrees with the bottom opening of the cover, and the cross-section of the cover gradually tapers away from the bottom opening. The recessed structure has multiple groove units arranged in an array on the inner sidewall of the cover, which can cover the field of view of the antenna chip to diverge the beam of the antenna chip.

2. The radome according to claim 1, characterized in that, The cover has two opposing first sidewalls and two opposing second sidewalls, which are arranged alternately along the circumference of the cover. The included angle formed by the two first sidewalls and the included angle formed by the two second sidewalls is 110-130 degrees.

3. The radome according to claim 2, characterized in that, The first sidewall and the second sidewall are connected by an arc surface, the radius of which is set to 5-20 mm.

4. The radome according to claim 1, characterized in that, The wall thickness of the enclosure is set to T, the relative permittivity of the material of the enclosure is ε, the maximum incident angle of the antenna chip beam on the enclosure is θ, and the wavelength of the antenna chip beam is λ, satisfying the following conditions: , where n is a positive integer greater than zero.

5. The radome according to claim 4, characterized in that, The wall thickness of the cover is set to 1.5-2.5 mm.

6. The radome according to claim 1, characterized in that, The depth of the groove unit is set to D, and the wavelength of the antenna chip beam is λ, satisfying 4≤λ / D≤8.

7. The radome according to claim 6, characterized in that, The depth of the groove unit is set to 0.6-0.9 mm.

8. The radome according to claim 1, characterized in that, The sidewall of the groove unit is perpendicular to the bottom opening of the cover.

9. The radome according to claim 8, characterized in that, The projections of any two adjacent groove units on the bottom opening surface of the cover are of the same size, and the projections of the plurality of groove units on the opening surface of the cover are evenly arranged.

10. The radome according to claim 9, characterized in that, The projection of the groove unit onto the bottom opening surface of the cover is square, and the side length of the projection of the groove unit onto the bottom opening surface of the cover is set to 0.8-1.2 mm.

11. The radome according to claim 9, characterized in that, The wavelength of the antenna chip beam is λ, and the center-to-center distance between the projections of two adjacent groove units on the bottom opening surface of the cover is λ / 2.

12. The radome according to claim 9, characterized in that, The center-to-center distance between the projections of two adjacent groove units on the bottom opening surface of the cover is 2-2.4 mm.

13. A radar device, characterized in that, It includes the radome as described in any one of claims 1-10.

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