CN217846608U - Radar apparatus - Google Patents
Radar apparatus Download PDFInfo
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- CN217846608U CN217846608U CN202221437451.8U CN202221437451U CN217846608U CN 217846608 U CN217846608 U CN 217846608U CN 202221437451 U CN202221437451 U CN 202221437451U CN 217846608 U CN217846608 U CN 217846608U
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Abstract
The utility model discloses a radar device. The radar apparatus includes: the antenna housing is fixedly connected with the shell to form a cavity, the radar plate is located in the cavity, the antenna is arranged on one side surface of the radar plate, the antenna housing is located above the antenna, and the middle area of the antenna housing protrudes towards the direction far away from the radar plate; wherein the thickness of the antenna housing is larger at the farther the antenna housing is from the central transceiving point of the antenna. The antenna setting is in a side of radar plate is on the surface, the antenna house is located the top of antenna, and the middle part region of antenna house is towards keeping away from the direction protrusion of radar plate, the antenna house distance its thickness of the more distant place of center receiving and dispatching point of antenna is big, and when receiving and dispatching the electromagnetic wave of big angle, its equivalent distance that passes the antenna house is close, reduces the influence of antenna house to big angle electromagnetic wave gain decay.
Description
Technical Field
The utility model relates to a radar technical field especially relates to a radar device.
Background
With the development of large-scale integrated circuit technology, the currently adopted vehicle-mounted millimeter wave collision avoidance radar system is highly integrated, and the automotive millimeter wave radar only comprises an antenna and a plurality of radio frequency transceiving and signal processing monolithic integrated circuit (MMIC) chips. Therefore, the antenna becomes one of the key design parts for the effective work of the millimeter wave radar of the automobile, and meanwhile, the antenna also becomes the key for whether the millimeter wave radar for the automobile can win the market.
Currently, the mainstream millimeter wave radar is mainly divided into a Long Range Radar (LRR), a Medium Range Radar (MRR) and a Short Range Radar (SRR) according to different application scene requirements. The antenna cover is one of important structural components of the radar, and can protect the antenna component from being influenced by external factors on the premise of not influencing the radiation performance of the antenna. The thickness dimension of the antenna housing commonly used at the present stage is related to the wavelength of the working frequency band, and the antenna housing is widely applied due to good performance indexes of reflection loss and transmission loss.
For medium-range and short-range radars, the radar has strong large-angle detection capability, so that the designed antenna component belongs to a wide-beam antenna. If the wide-beam antenna uses a common antenna housing, the directional diagram gain of the wide-beam antenna rapidly decreases along with the increase of the angle, and the large-angle detection capability of the radar is seriously influenced. The reason is that the dielectric constant of the existing antenna housing material is high, when electromagnetic waves pass through the antenna housing, large refraction can be generated, and different incident angles correspond to different transmission propagation distances, so that the original radiation direction of the antenna is influenced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a radar device, the dielectric constant that aims at effectively solving present antenna house material is higher, can produce great refraction when the electromagnetic wave passes the antenna house, and different incident angle has corresponded different transmission propagation distance to influence the original radiation direction of antenna.
According to the utility model discloses an aspect, the utility model provides a radar device, include: the antenna housing is fixedly connected with the shell to form a cavity, the radar plate is located in the cavity, the antenna is arranged on one side surface of the radar plate, the antenna housing is located above the antenna, and the middle area of the antenna housing protrudes towards the direction far away from the radar plate; wherein the thickness of the antenna housing is larger at the position farther away from the central transceiving point of the antenna
Further, for all first type points on the inner surface of the antenna housing, which meet the following conditions, a difference value between respective lengths of connecting lines between two first type points at any distance and a central transmitting and receiving point of the antenna is smaller than a preset length threshold value: and a transmission included angle formed by a connecting line of the point and the central transceiving point of the antenna and a straight line passing through the central transceiving point of the antenna and vertical to the radar plate does not exceed a preset angle threshold value.
Further, the preset angle threshold is 80 degrees.
Further, for all second type points on the inner surface of the radome, a difference value between respective lengths of connecting lines between two second type points arbitrarily separated by the preset distance and a central transceiving point of the antenna is not less than the preset length threshold value: and a propagation included angle formed by a connecting line of the point and the central transceiving point of the antenna and a straight line passing through the central transceiving point of the antenna and perpendicular to the radar plate exceeds the preset angle threshold.
Further, for each second type point, a length value of a connection line between the point and the central transceiving point of the antenna is positively correlated with a propagation angle corresponding to the point, wherein the larger the propagation angle is, the higher the length value is.
Further, a vertical height of the first type point to the radar plate is greater than a vertical height of the second type point to the radar plate.
Further, a vertical height from a point on the inner surface of the radome to the radar plate satisfies the following equation: and S = H COS (theta), wherein S is the vertical height from the point to the radar plate, H is the vertical height from the point on the inner surface of the antenna housing corresponding to the propagation included angle of 0 degree to the radar plate, and theta is the propagation included angle corresponding to the point.
Further, a radome thickness at a location of a point on an inner surface of the radome satisfies the following equation:
wherein d is the thickness of the antenna housing at the position of the point, n is a preset thickness coefficient of the antenna housing, λ is the wavelength of the electromagnetic wave corresponding to the antenna, ε is the equivalent dielectric constant of the antenna housing, and θ is the propagation included angle corresponding to the point.
Further, the thickness of the radome at a point on the inner surface of the radome corresponding to a propagation angle of 0 degrees is the smallest.
Further, the antenna is a wide beam antenna.
The utility model has the advantages of, the antenna setting is in one side of radar plate is on the surface, the antenna house is located the top of antenna, and the middle part region of antenna house is towards keeping away from the direction protrusion of radar plate, the antenna house distance its thickness of the more distant part of center point of issue of antenna is big more, and when receiving and dispatching the electromagnetic wave of large angle, its equivalent distance that passes the antenna house is close, reduces the influence of antenna house to large-angle electromagnetic wave gain decay. On the other hand, the distance between the lower surface of the antenna housing and the central transceiving point of the antenna is also close within the preset angle threshold, so that the influence in the electromagnetic wave propagation process can be further reduced.
Drawings
The technical solution and other advantages of the present invention will become apparent from the following detailed description of the embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a radar apparatus according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view of a radar apparatus according to an embodiment of the present invention.
Fig. 3 is a gain diagram of a radar apparatus according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a radar apparatus according to a second embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
As shown in fig. 1, it is a schematic structural diagram of an apparatus mounting bracket according to an embodiment of the present invention. The radar apparatus includes: a radar panel 30, a housing 10, an antenna 20, and a radome 40.
Referring to fig. 2 in combination, the antenna housing 40 is fixedly connected to the housing 10 to form a cavity 50, the radar plate 30 is located in the cavity 50, the antenna 20 is disposed on one side surface of the radar plate 30, the antenna housing 40 is located above the antenna 20, and a middle region of the antenna housing 40 is protruded in a direction away from the radar plate 30, wherein the thickness of the antenna housing 40 is increased as it is farther from a central transceiving point of the antenna 20.
For all the first type points on the inner surface 42 of the radome 40, the difference between the lengths of the respective connecting lines of the two first type points at any distance from each other and the central transmitting and receiving point of the antenna 20 is smaller than a preset length threshold: a propagation included angle formed by a connection line between the point and the central transceiving point of the antenna 20 and a straight line passing through the central transceiving point of the antenna 20 and perpendicular to the radar plate 30 does not exceed a preset angle theta threshold value. Illustratively, the preset angle θ threshold is 80 degrees. It should be noted that, taking a plane rectangular coordinate system of a two-dimensional X-Y axis as an example, an included angle formed between the straight line a and the Y axis in the first quadrant is not more than 80 degrees, and an included angle formed between the straight line B and the Y axis in the second quadrant is not more than 80 degrees, which falls within the preset angle θ threshold of 80 degrees in this embodiment. The same applies to placing it in three dimensions.
Illustratively, the vertical height of the first type of point to the radar panel 30 is greater than the vertical height of the second type of point to the radar panel 30.
Illustratively, the vertical height from a point on the inner surface 42 of the radome 40 to the radar plate 30 satisfies the following equation: s = H COS (θ), where S is the vertical height from the point to the radar plate 30, H is the vertical height from the point on the inner surface 42 of the radome 40 to the radar plate 30 corresponding to the propagation angle of 0 degree, and θ is the propagation angle corresponding to the point.
Illustratively, for each point of the second type, a length value of a connection line between the point and the central receiving and transmitting point of the antenna 20 is positively correlated with a propagation angle corresponding to the point, wherein the larger the propagation angle is, the higher the length value is.
Illustratively, the thickness of the radome 40 at the location of the point on the inner surface 42 of the radome 40 satisfies the following equation:
where d is the thickness of the radome 40 at the pointAnd degree, wherein n is a preset thickness coefficient of the antenna housing 40, λ is a wavelength of an electromagnetic wave corresponding to the antenna 20, epsilon is a relative dielectric constant of the antenna housing 40, and theta is the propagation included angle corresponding to the point. The radome thickness 40 is the distance between the radome outer surface 41 and the corresponding radome inner surface 42.
Illustratively, the thickness of the radome 40 at a point on the inner surface 42 of the radome 40 corresponding to an included propagation angle of 0 degrees is minimal.
Illustratively, the antenna 20 is a wide beam antenna 20. As shown in fig. 3, in practical design, the medium-range radar device and the short-range radar device should have strong large-angle detection capability, so that the designed antenna 20 component belongs to the wide-beam antenna 20. If the general antenna housing 40 is used for the wide-beam antenna 20, the directional pattern gain of the wide-beam antenna is in a rapidly decreasing trend along with the increase of the angle, and the large-angle detection capability of the radar is seriously affected. This is because the dielectric constant of the existing antenna cover 40 material is high, and when the electromagnetic wave passes through the antenna cover 40, the electromagnetic wave is greatly refracted, and different incident angles correspond to different transmission propagation distances, so that the original radiation direction of the antenna 20 is affected. Therefore, for medium-range and short-range radars, the influence of propagation factors needs to be reduced, and the beam width is as close as possible to the case without the radome 40. Therefore, the gain diagram of the radar device in the embodiment in fig. 3 is similar to the gain diagram of the radome 40, and the performance of the radar device is obviously better than that of the ordinary radar device in fig. 3.
The antenna 20 of the first embodiment is disposed on a side surface of the radar plate 30, the antenna cover 40 is located above the antenna 20, the central region of the antenna cover 40 protrudes toward a direction away from the radar plate 30, the farther the antenna cover 40 is from a central transceiving point of the antenna 20, the larger the thickness of the antenna cover is, when an electromagnetic wave with a large angle is transceived, the equivalent distance of the antenna cover 40 is close, and the influence of the antenna cover 40 on the electromagnetic wave is reduced. On the other hand, the distance between the lower surface of the antenna cover 40 and the central transceiving point of the antenna 20 within the preset angle θ threshold is also close, so that the influence in the electromagnetic wave propagation process can be further reduced.
As shown in fig. 4, it is a schematic structural diagram of an apparatus mounting bracket provided in the second embodiment of the present invention. The radar apparatus includes: a radar plate 30, a housing 10, an antenna 20, and a radome 40.
The radome 40 is fixedly connected with the housing 10 to form a cavity 50, the radar plate 30 is located in the cavity 50, the antenna 20 is disposed on one side surface of the radar plate 30, the radome 40 is located above the antenna 20, and a middle region of the radome 40 is protruded in a direction away from the radar plate 30, wherein the thickness of the radome 40 is increased as the radome 40 is farther from a central transceiving point of the antenna 20.
For all the first type points on the inner surface 42 of the radome 40, the difference between the lengths of the lines connecting each of two first type points at any preset distance from the central transceiving point of the antenna 20 is smaller than a preset length threshold value: a propagation included angle formed by a connecting line between the point and the central transceiving point of the antenna 20 and a straight line passing through the central transceiving point of the antenna 20 and perpendicular to the radar plate 30 does not exceed a preset angle theta threshold value. Illustratively, the preset angle θ threshold is 80 degrees. It should be noted that, taking a plane rectangular coordinate system of a two-dimensional X-Y axis as an example, an included angle formed between the straight line a and the Y axis in the first quadrant does not exceed 80 degrees, and an included angle formed between the straight line B and the Y axis in the second quadrant does not exceed 80 degrees, which falls into the embodiment that the threshold value of the angle θ does not exceed the preset angle θ is 80 degrees. The same applies to placing it in three dimensions.
Illustratively, the vertical height of the first type of point to the radar panel 30 is greater than the vertical height of the second type of point to the radar panel 30.
Illustratively, the vertical height from a point on the inner surface 42 of the radome 40 to the radar plate 30 satisfies the following equation: s = H COS (θ), where S is the vertical height of the point to the radar plate 30, H is the vertical height of the point on the inner surface 42 of the radome 40 to the radar plate 30 corresponding to the propagation angle of 0 degrees, and θ is the propagation angle corresponding to the point.
Illustratively, for each point of the second type, a length value of a connection line between the point and the central receiving and transmitting point of the antenna 20 is positively correlated with a propagation angle corresponding to the point, wherein the larger the propagation angle is, the higher the length value is.
Illustratively, the thickness of the radome 40 at the location of the point on the inner surface 42 of the radome 40 satisfies the following equation:
wherein d is the thickness of the antenna housing 40 at the position of the point, n is a preset thickness coefficient of the antenna housing 40, λ is the wavelength of the electromagnetic wave corresponding to the antenna 20, ε is the equivalent dielectric constant of the antenna housing 40, and θ is the propagation included angle corresponding to the point.
Illustratively, the thickness of the radome 40 at a point on the inner surface 42 of the radome 40 corresponding to an included propagation angle of 0 degrees is minimal.
Illustratively, the antenna 20 is a wide beam antenna 20. In practical design, the medium-range radar device and the short-range radar device should have strong large-angle detection capability, so that the designed antenna 20 component belongs to the wide-beam antenna 20. If the general antenna housing 40 is used for the wide-beam antenna 20, the directional pattern gain of the wide-beam antenna is in a rapid descending trend along with the increase of the angle, and the large-angle detection capability of the radar is seriously affected. This is because the dielectric constant of the existing antenna cover 40 material is high, and when the electromagnetic wave passes through the antenna cover 40, the electromagnetic wave is greatly refracted, and different incident angles correspond to different transmission propagation distances, so that the original radiation direction of the antenna 20 is affected. Therefore, for the medium-range and short-range radars, the influence of the propagation factor needs to be reduced, and the beam width is as close as possible to the case without the radome 40. Therefore, the gain diagram of the radar device in the embodiment in fig. 3 is similar to the gain diagram of the radome 40, and the performance of the radar device is obviously better than that of the ordinary radar device in fig. 3.
The second embodiment the antenna 20 is disposed on a surface of the radar plate 30, the antenna cover 40 is located above the antenna 20, and the central region of the antenna cover 40 is protruded towards a direction away from the radar plate 30, the distance between the antenna cover 40 and the center transceiving point of the antenna 20 is larger in the thickness thereof, when receiving and transmitting electromagnetic waves with large angles, the equivalent distance of the antenna cover 40 is close, and the influence of the antenna cover 40 on the electromagnetic waves is reduced. On the other hand, the distance between the lower surface of the antenna housing 40 and the central transceiving point of the antenna 20 within the preset angle θ threshold value is also close, so that the influence in the electromagnetic wave propagation process can be further reduced.
In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, so that the scope of the present invention shall be determined by the scope of the appended claims.
Claims (10)
1. A radar apparatus, comprising: the antenna housing is fixedly connected with the shell to form a cavity, the radar plate is located in the cavity, the antenna is arranged on one side surface of the radar plate, the antenna housing is located above the antenna, and the middle area of the antenna housing protrudes towards the direction far away from the radar plate;
wherein the thickness of the antenna housing is larger at the farther the antenna housing is from the central transceiving point of the antenna.
2. The radar apparatus according to claim 1, wherein for all first type points on the inner surface of the radome, a difference between respective lengths of connection lines between respective two first type points that are arbitrarily separated by a preset distance and a central transceiving point of the antenna is smaller than a preset length threshold: and a transmission included angle formed by a connecting line of the point and the central transceiving point of the antenna and a straight line passing through the central transceiving point of the antenna and vertical to the radar plate does not exceed a preset angle threshold value.
3. Radar apparatus according to claim 2, characterised in that the preset angle threshold is 80 degrees.
4. The radar apparatus according to claim 2, wherein a difference between respective lengths of lines connecting respective two second-type points arbitrarily distant from the preset distance and a central transmitting and receiving point of the antenna is not less than the preset length threshold value for all second-type points on the inner surface of the radome, which satisfies the following condition: and a transmission included angle formed by a connecting line of the point and the central transceiving point of the antenna and a straight line passing through the central transceiving point of the antenna and vertical to the radar plate exceeds the preset angle threshold value.
5. The radar apparatus according to claim 4, wherein for each point of the second type, a length value of a connection line between the point and the central transceiver point of the antenna is positively correlated with a propagation angle corresponding to the point, and the larger the propagation angle is, the higher the length value is.
6. Radar apparatus according to any of claims 4 to 5, characterised in that the vertical height of the first type of point to the radar panel is greater than the vertical height of the second type of point to the radar panel.
7. The radar apparatus of claim 6, wherein a vertical height from a point on the inner surface of the radome to the radar plate satisfies the following equation: and S = H COS (theta), wherein S is the vertical height from the point to the radar plate, H is the vertical height from the point on the inner surface of the antenna housing corresponding to the propagation included angle of 0 degree to the radar plate, and theta is the propagation included angle corresponding to the point.
8. The radar apparatus of claim 7, wherein a radome thickness at a location of a point on the inner surface of the radome satisfies the following equation:
wherein d is the thickness of the antenna housing at the position of the point, and n is a preset antenna housingAnd the thickness coefficient, wherein lambda is the wavelength of the electromagnetic wave corresponding to the antenna, epsilon is the relative dielectric constant of the antenna housing, and theta is the propagation included angle corresponding to the point.
9. The radar apparatus of claim 2, wherein the thickness of the radome at a point on the inner surface of the radome corresponding to an included propagation angle of 0 degrees is a minimum.
10. The radar apparatus of claim 1, wherein the antenna is a wide beam antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221437451.8U CN217846608U (en) | 2022-06-08 | 2022-06-08 | Radar apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221437451.8U CN217846608U (en) | 2022-06-08 | 2022-06-08 | Radar apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217846608U true CN217846608U (en) | 2022-11-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221437451.8U Active CN217846608U (en) | 2022-06-08 | 2022-06-08 | Radar apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217846608U (en) |
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2022
- 2022-06-08 CN CN202221437451.8U patent/CN217846608U/en active Active
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