CN220172375U - Radar structure and radar system - Google Patents
Radar structure and radar system Download PDFInfo
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- CN220172375U CN220172375U CN202321591882.4U CN202321591882U CN220172375U CN 220172375 U CN220172375 U CN 220172375U CN 202321591882 U CN202321591882 U CN 202321591882U CN 220172375 U CN220172375 U CN 220172375U
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- 230000005855 radiation Effects 0.000 claims abstract description 75
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- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
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- 238000012545 processing Methods 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 238000005234 chemical deposition Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
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Abstract
The embodiment of the utility model relates to the technical field of radars and discloses a radar structure and a radar system. The radar structure includes: the antenna cover is arranged on the first surface of the circuit board; the antenna structure comprises a radiation part and a shielding cover, wherein the radiation part is at least partially positioned on one surface of the antenna cover facing the circuit board, the shielding cover is arranged on the first surface and positioned between the antenna cover and the circuit board, and a feed part for feeding the radiation part on the antenna cover by the circuit board is arranged at a position of the shielding cover corresponding to the radiation part on the antenna cover; the shielding cover is used for radiating out partial signals radiated to one side of the circuit board by the radiating part in a direction away from one side of the circuit board. The radar structure provided by the embodiment of the utility model can reduce the size of the radar without affecting the performance of the radar, and has simple structure and easy realization.
Description
Technical Field
The embodiment of the utility model relates to the technical field of radars, in particular to a radar structure and a radar system.
Background
Millimeter wave radars are detection radars working in the millimeter wave frequency band, and have the advantages of small power consumption, high resolution, capability of well protecting the privacy of users and the like, so that the millimeter wave radars are widely applied to various large fields, such as the automotive autopilot field and the smart home application field. With the development of Chip technology in recent years, millimeter wave radar chips are increasingly appearing on the market in the form of System On Chip (SOC).
The antenna is an integral part of a millimeter wave radar, and its characteristics largely determine the range and angle that can be detected by the radar module. Packaged antenna technology (Antenna in Package, aiP) integrates antennas on chips, but is limited by the chip package size, array placement of packaged antennas, and array aperture of radar. The chip and the antenna are located on the same layer of a printed circuit board (Printed Circuit Board, PCB) and are connected through a feeder line, most of the area on the PCB is occupied by the antenna, the feeder line needs to bypass the chip for wiring, and under the condition that some antennas are arranged in an array, the feeder line surrounds the chip, so that the radar characteristic is deteriorated. In addition, the antenna board is usually an expensive high-frequency board, so that the cost of the radar is high.
In order to solve the above problem, the overall size of the millimeter wave radar can be reduced to the size occupied by the antenna in the millimeter wave radar, and there are mainly two ways: (1) A chip feeder line and an antenna structure are respectively placed by adopting a multi-layer PCB (printed circuit board); (2) The antenna structure is located on a single layer of the PCB board by adopting the back feed mode, but the antenna feed structure of the first mode is complex and requires complex processing technology to implement, and the second mode introduces additional transmission layer loss.
Content of the application
The embodiment of the utility model aims to provide a radar structure and a radar system, which can reduce the size of a radar without affecting the performance of the radar, and have simple structure and easy realization.
To solve the above technical problems, an embodiment of the present utility model provides a radar structure, including: the antenna cover is arranged on the first surface of the circuit board; the antenna structure comprises a radiation part and a shielding cover, wherein the radiation part is at least partially positioned on one surface of the antenna cover facing the circuit board, the shielding cover is arranged on the first surface and positioned between the antenna cover and the circuit board, and a feed part for feeding the radiation part on the antenna cover by the circuit board is arranged at a position of the shielding cover corresponding to the radiation part on the antenna cover; the shielding cover is used for radiating out partial signals radiated to one side of the circuit board by the radiating part in a direction away from one side of the circuit board.
The embodiment of the utility model also provides a radar system comprising the radar structure.
The utility model discloses a radar structure, which comprises a circuit board, an antenna structure and an antenna housing, wherein the antenna housing is arranged on a first surface of the circuit board, the antenna structure comprises a radiation part and a shielding cover, the radiation part is at least partially positioned on one surface of the antenna housing facing the circuit board, the shielding cover is arranged on the first surface of the circuit board and positioned between the antenna housing and the circuit board, a feed part for feeding the radiation part on the antenna housing by the circuit board is arranged at a position of the shielding cover corresponding to the radiation part on the antenna housing, and the shielding cover is used for radiating part of signals radiated by the radiation part facing one side of the circuit board to a direction far away from one side of the circuit board. Because at least partial radiating part of the antenna structure is arranged on the antenna housing, the increase of the radar size caused by the fact that the radiating parts are arranged on the circuit board is avoided, meanwhile, the influence of the antenna housing on the antenna radiation pattern is reduced, the performance of the radar system is improved, and the structure is simple and easy to realize.
In some embodiments, the radiating portion on the radome includes at least one first radiating patch, and the feeding portion includes at least one feeding module in one-to-one correspondence with the first radiating patch; each feeding module is opposite to the corresponding first radiation patch and is used for feeding the corresponding first radiation patch to the circuit board.
In some embodiments, the feed module is a slot through the shield directed from the radome to the circuit board.
In some embodiments, a plurality of grooves are formed on one surface of the shielding cover facing the antenna cover, and the position, where the grooves are not formed, of the surface of the shielding cover facing the antenna cover is attached to the surface of the antenna cover facing the surface of the shielding cover so as to form an air cavity at each groove; each of the feed modules is one of the air cavities. The air cavity in the embodiment can prevent radiation signals from being scattered, and radiation performance of the antenna structure is improved.
In some embodiments, a surface area of the radome facing the first radiating patch is a beveled area non-parallel to the circuit board. The beveled region in this embodiment is capable of changing the radiation direction of the radiated signal, thereby achieving radiation of a particular antenna pattern.
In some embodiments, a surface area of the radome facing away from the circuit board and opposite the first radiating patch is provided with a raised structure facing away from the circuit board. The bump structure in this embodiment can change the radiation direction of the radiation signal, thereby realizing radiation of a specific antenna pattern.
In some embodiments, at least a portion of the structure of the portion of the radiating portion located on the radome is directly opposite to the location of the radar chip on the circuit board. The present embodiment can further reduce the size of the radar structure.
In some embodiments, at least another portion of the radiating portion is located on the first face of the circuit board.
In some embodiments, the distance between the shield and the radome is less than or equal to 1/2 lambda.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.
FIG. 1 is a schematic illustration of a radar structure provided in accordance with one embodiment of the present utility model;
fig. 2 is a schematic diagram of a radiating antenna;
FIG. 3 is a schematic illustration of a radiation portion provided in accordance with one embodiment of the present utility model;
FIG. 4 is a schematic diagram of a feed module provided in accordance with one embodiment of the utility model;
FIG. 5 is a schematic illustration of a shield provided in accordance with an embodiment of the present utility model;
fig. 6 is a schematic diagram of a radome provided according to one embodiment of the present utility model;
fig. 7 is a schematic diagram ii of a radome according to an embodiment of the present utility model;
FIG. 8 is a schematic diagram II of a radiation portion provided according to an embodiment of the present utility model;
fig. 9 is a schematic diagram III of a radiation portion provided according to an embodiment of the present utility model.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. However, it will be understood by those of ordinary skill in the art that in various embodiments of the present utility model, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. However, the claimed technical solution of the present utility model can be realized without these technical details and various changes and modifications based on the following embodiments. The following embodiments are divided for convenience of description, and should not be construed as limiting the specific implementation of the present utility model, and the embodiments can be mutually combined and referred to without contradiction.
One embodiment of the utility model relates to a radar structure, which comprises a circuit board, an antenna structure and a radome, wherein the radome is arranged on a first surface of the circuit board, the antenna structure comprises a radiation part and a shielding cover, the radiation part is at least partially positioned on one surface of the radome facing the circuit board, the shielding cover is arranged on the first surface of the circuit board and positioned between the radome and the circuit board, a feed part for feeding the radiation part on the radome by the circuit board is arranged at a position of the shielding cover corresponding to the radiation part, and the shielding cover is used for radiating part of signals radiated by the radiation part facing one side of the circuit board to a direction away from one side of the circuit board. Because at least part of the radiating part of the antenna structure is arranged on the antenna housing, the increase of the radar size caused by the arrangement of the radiating part on the circuit board is avoided, the antenna structure occupying most area of the radar structure is arranged on the antenna housing, the number of layers of the PCB (circuit board) can be reduced, and a more economical processing technology can be used; meanwhile, at least part of the radiation part of the antenna structure is arranged on the antenna housing, so that the influence of the antenna housing on the antenna radiation pattern can be reduced, and the performance of the radar system is improved.
In another aspect, in a conventional radar structure, the antenna is designed on a PCB board, and the radome is placed at a distance from the PCB board. In this case, the electromagnetic wave needs to pass through a transmission path of air (air between the PCB board and the radome) -radome (medium) -air, and according to the refraction principle, the antenna has obvious refraction problem in a large angle; in the present utility model, however, the antenna structure is directly arranged on the radome, and the electromagnetic wave only needs to pass through the path of the radome (medium) -air, and in general, the refractive index of the radome is higher than that of the air, so that the problem is effectively alleviated.
In the existing radar structure, the feed point of the antenna is limited at one end of the antenna due to the defect of the arrangement space on the PCB; in the utility model, the antenna is arranged on the antenna housing, the arrangement space is enough, the feeding point of the antenna is not limited, the feeding point can be arranged in the middle of the antenna, the pitching wave beam can be completely ensured to point to the front, and the performance of the antenna is improved.
Implementation details of the radar structure of the present embodiment are specifically described below, and the following is merely provided for understanding the implementation details, and is not necessary to implement the present embodiment.
The radar structure of the present embodiment includes, as shown in fig. 1, a circuit board 1, an antenna structure 2, and a radome 3, and the antenna structure 2 includes a radiation portion 21 and a shielding case 22.
Specifically, the radome 3 is covered on the first surface of the circuit board 1; the shielding cover 22 is also arranged on the first surface of the circuit board 1 and is positioned between the antenna cover 3 and the circuit board 1; the radiation portion 21 is at least partially located on the radome 3, and specifically is disposed on a side of the radome 3 facing the circuit board 1, in a manner including, but not limited to, 3D printing, painting, chemical deposition, and the like. In some embodiments, the radiating portion 21 is entirely located on the radome 3, instead of providing the radiating portion 21 on the circuit board 1, reducing the size and cost of the radar; in other embodiments, the radiating portion 21 is partially located on the radome 3, partially located on the circuit board 1, and specifically located on the first surface of the circuit board 1 (only the radiating portion 21 located on the radome 3 is shown in fig. 1), and this embodiment considers some radiating antennas (i.e., the radiating portion 21), such as a laminated antenna and an L-type fed patch antenna, which are all located on the radome 3 with some difficulty due to their own structure, so that a part of the radiating antennas may be located on the radome 3, and another part of the radiating antennas may be located on the circuit board 1, and still the radar size and radar cost may be reduced compared to a radar in which the radiating antennas are all located on the circuit board 1.
The shielding cover 22 is used for shielding unnecessary radiation signals and providing conventional functions such as heat dissipation for a radar chip on the circuit board, and is also used for radiating part of the radiation part 21 to a part of the signal radiated towards the side of the circuit board 1 and radiating the part of the signal away from the side of the circuit board 1, namely realizing the reflection of the radiation signals, thereby further improving the performance of the radar. It will be appreciated that if a portion of the radiating portion 21 is located on the circuit board 1, a feeder line is used to connect the radar chip on the circuit board 1 to the radiating portion 21 to realize feeding of the radar chip to the radiating portion 21.
In the related art, the radiation antenna is arranged on the circuit board to increase the size and cost of the radar, and the radiation signal passes through a layer of radome before being radiated, so that the loss of the radiation signal is caused, and meanwhile, the antenna radiation pattern is distorted.
In some embodiments, at least part of the structure of the part of the radiating portion 21 located on the radome 3 is opposite to the position of the radar chip on the circuit board 1, fig. 2 is the arrangement position of the radiating antenna (including the transmitting antenna and the receiving antenna) in the related art, and the radiating antenna is arranged on the circuit board and connected to the radar chip, and is arranged around the radar chip, resulting in the increase of the size of the circuit board, while in this embodiment, not only the radiating portion 21 is at least partially arranged on the radome 3, but also at least part of the structure of the part of the radiating portion 21 located on the radome 3 is opposite to the position of the radar chip on the circuit board 1, so that it is located directly above the radar chip, instead of arranging the radiating antenna around the radar chip as shown in fig. 2, so that the size of the radar can be further reduced. In other embodiments, as shown in fig. 3, the antenna aperture of the transmitting antenna and the antenna aperture of the receiving antenna in the partial radiating portion 21 located on the radome 3 are shared (the transmitting antenna above and the receiving antenna below), so that the size of the radar can be further reduced.
In one example, the distance between the shield 22 and the radome 3 is less than or equal to 1/2 lambda to reduce the effect of an excessive distance between the shield 22 and the radiating portion 21 of the radome 3 on the radiation performance. Wherein lambda is the wavelength corresponding to the working frequency of the antenna structure.
In some embodiments, the radiation portion 21 located on the radome 3 includes at least one first radiation patch, where the feeding portion includes at least one feeding module corresponding to the first radiation patch one by one, and each feeding module is opposite to the corresponding first radiation patch, so as to implement feeding for the corresponding first radiation patch by the circuit board. As shown in fig. 1, three first radiation patches are located on the side of the radome 3 facing the circuit board 1, and three feeding modules are disposed on the shielding cover 22 opposite to the three first radiation patches, so as to respectively realize feeding of the three first radiation patches.
In one example, as shown in fig. 4, the feeding module is a slot 221 extending through the shield 22 from the radome 3 to the circuit board 1, and each first radiating patch corresponds to a slot 221 for feeding. At this time, a coupling patch is disposed on the first surface of the circuit board 1 opposite to the slot 221, and the coupling patch is connected with the radar chip on the circuit board 1, so that the first radiation patch and the corresponding coupling patch implement coupling feeding through the corresponding slot 221. In other examples, the feeding module may have other structures, for example, the shielding case 22 is hollowed out, and the circuit board is implemented to feed the corresponding first radiation patch through the hollowed out area on the shielding case 22. In some embodiments, the first radiating patch may be directly connected to the circuit board through a feeder line, where the feeder line may serve as a feeding module, and the circuit board feeds the first radiating patch through the feeder line.
In an example, as shown in fig. 5, a plurality of grooves are formed on a surface of the shielding cover 22 facing the radome 3, a position of the shielding cover 22 facing the radome 3, where no groove is formed, is attached to a surface of the facing radome 3, so as to form an air cavity 222 at each groove, at this time, each feeding module is an air cavity 222, and by setting the air cavity 222, the signal radiated by the first radiation patch is not scattered, thereby improving the radiation performance of the radiation portion 21.
In practical application, the requirements of various performance indexes of the radar in different application scenes are different, so that different requirements exist for the design of the antenna structure. Whereas, since the radiation portion 21 of the antenna structure is partially provided on the radome 3, in some embodiments, the change of the radiation direction of the radiation portion 21 can be achieved by replacing the radome 3, the present embodiment shows the following two radomes 3:
(1) The surface area of the radome 3 facing the first radiation patch is a bevel area non-parallel to the circuit board 1, as shown in fig. 6, at this time, the first radiation patch of the radiation portion 21 radiates signals to the upper left, and it can be understood that by changing the inclination direction of the bevel area, the first radiation patch of the radiation portion 21 can radiate signals to the upper right.
(2) The surface area of the radome 3 facing away from the circuit board 1 and opposite to the first radiating patch is provided with a protruding structure 31 facing away from the circuit board 1, as shown in fig. 7, when the first radiating patch of the radiating portion 21 radiates a signal directly above.
The present embodiment shows only two forms of radome 3, and in a specific implementation, a person skilled in the art may change the structure of radome 3 according to actual needs to implement the change of the radiation direction of radiation portion 21.
In some embodiments, different radars have different requirements on the gain of the antenna structure, e.g., a horn radar generally expects the antenna structure to have a relatively wide field of view FOV, but the requirements on the antenna gain are not strict, a front radar generally expects the antenna to have a high gain but the requirements on the FOV are not high, so the antenna radiating portion can also be replaced to meet the requirements of different radars on the antenna radiating portion. In the related art, the whole circuit board needs to be redesigned and processed to replace the antenna radiation part, which brings extra investment in research and development and time. For example, the radome in fig. 8 is replaced by the radome in fig. 9, so that the replacement of the radiation portion of the antenna is realized, and the radiation portion on the radome in fig. 9 has a narrower beam width and a larger gain compared with that in fig. 8.
It should be noted that, the foregoing examples in the present embodiment are all examples for understanding and are not limited to the technical solution of the present utility model.
Another embodiment of the utility model relates to a radar system comprising a radar structure according to any of the embodiments described above.
It is to be noted that this embodiment is a system embodiment corresponding to the above-described structural embodiment, and this embodiment may be implemented in cooperation with the above-described structural embodiment. The related technical details and technical effects mentioned in the above embodiments are still valid in this embodiment, and in order to reduce repetition, they are not described here again. Accordingly, the related technical details mentioned in the present embodiment can also be applied to the above-described embodiments.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of carrying out the utility model and that various changes in form and details may be made therein without departing from the spirit and scope of the utility model.
Claims (10)
1. A radar structure, comprising: the antenna cover is arranged on the first surface of the circuit board;
the antenna structure comprises a radiation part and a shielding cover, wherein the radiation part is at least partially positioned on one surface of the antenna cover facing the circuit board, the shielding cover is arranged on the first surface and positioned between the antenna cover and the circuit board, and a feed part for feeding the radiation part on the antenna cover by the circuit board is arranged at a position of the shielding cover corresponding to the radiation part on the antenna cover;
the shielding cover is used for radiating out partial signals radiated to one side of the circuit board by the radiating part in a direction away from one side of the circuit board.
2. The radar structure of claim 1, wherein the radiating portion on the radome includes at least one first radiating patch, and the feeding portion includes at least one feeding module in one-to-one correspondence with the first radiating patch;
each feeding module is opposite to the corresponding first radiation patch and is used for feeding the corresponding first radiation patch to the circuit board.
3. The radar structure of claim 2, wherein the feed module is a slot through the shield from the radome to the circuit board.
4. The radar structure of claim 2, wherein a face of the shield facing the radome is provided with a plurality of grooves, and a position of the face of the shield facing the radome where the grooves are not provided is attached to the face of the radome facing the grooves, so as to form an air cavity at each groove; each of the feed modules is one of the air cavities.
5. The radar structure of claim 2, wherein a surface area of the radome facing the first radiating patch is a beveled area non-parallel to the circuit board.
6. The radar structure of claim 2, wherein a surface area of the radome facing away from the circuit board and opposite the first radiating patch is provided with a raised structure facing away from the circuit board.
7. The radar structure of claim 1, wherein at least a portion of the structure of the portion of the radiating portion on the radome is directly opposite to a location of the radar chip on the circuit board.
8. The radar structure according to any one of claims 1 to 6, characterized in that at least another part of the radiating portion is located on the first face of the circuit board.
9. The radar structure according to any one of claims 1 to 6, characterized in that a distance between the radome and the radome is less than or equal to 1/2 λ.
10. A radar system, comprising: the radar structure of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321591882.4U CN220172375U (en) | 2023-06-20 | 2023-06-20 | Radar structure and radar system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321591882.4U CN220172375U (en) | 2023-06-20 | 2023-06-20 | Radar structure and radar system |
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| Publication Number | Publication Date |
|---|---|
| CN220172375U true CN220172375U (en) | 2023-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321591882.4U Active CN220172375U (en) | 2023-06-20 | 2023-06-20 | Radar structure and radar system |
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| CN (1) | CN220172375U (en) |
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- 2023-06-20 CN CN202321591882.4U patent/CN220172375U/en active Active
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