CN115566400B - 3D metallized vehicle millimeter wave radar antenna, vehicle millimeter wave radar and automobile - Google Patents
3D metallized vehicle millimeter wave radar antenna, vehicle millimeter wave radar and automobile Download PDFInfo
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- CN115566400B CN115566400B CN202211206722.3A CN202211206722A CN115566400B CN 115566400 B CN115566400 B CN 115566400B CN 202211206722 A CN202211206722 A CN 202211206722A CN 115566400 B CN115566400 B CN 115566400B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/32—Adaptation for use in or on road or rail vehicles
- H01Q1/3208—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used
- H01Q1/3233—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/10—Resonant slot antennas
- H01Q13/18—Resonant slot antennas the slot being backed by, or formed in boundary wall of, a resonant cavity ; Open cavity antennas
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- Radar Systems Or Details Thereof (AREA)
Abstract
The invention provides a 3D metallized vehicle millimeter wave radar antenna, a vehicle millimeter wave radar and an automobile, wherein the vehicle millimeter wave radar antenna can be manufactured by adopting an integrated forming process and comprises a radiation layer, a coupling layer, a waveguide layer and a feed layer which are sequentially arranged from top to bottom, wherein each adjacent layer is in seamless fit, and each layer is of a metallized structure or a surface metallized structure after plastic forming; the radiation layer is provided with N radiation units; waveguide units are arranged at the positions of the coupling layers corresponding to the radiation units; the waveguide layer is provided with a resonant cavity, and a rectangular groove is arranged in the resonant cavity; the feed layer is provided with a rectangular waveguide, the waveguide transmission line is used for feeding the waveguide layer, and the waveguide layer carries out coupling feed on the radiation unit of the radiation layer through the coupling layer. The invention realizes the highly symmetrical smoothing of horizontal polarization and radiation pattern by using the antenna with the multilayer metallization structure.
Description
Technical Field
The invention relates to the technical field of vehicle-mounted antennas, in particular to a 3D metallized vehicle-mounted millimeter wave radar antenna, a vehicle-mounted millimeter wave radar and an automobile.
Background
With the continuous improvement of the economic level of China and the rapid development of the automobile industry, the automobile conservation quantity of China is increased continuously, the occurrence rate of automobile traffic accidents is also improved, and the property loss and casualties caused by the automobile traffic accidents are created newly and increased frequently. The vehicle-mounted radar can detect the speed, distance and position of objects around the automobile in real time, and can realize the functions of blind zone detection, self-adaptive cruising, collision early warning and the like by detecting the form environment around the automobile and according to the acquired road, automobile position and obstacle information, so as to judge whether other vehicles, obstacles, pedestrians and the like around the automobile threaten the automobile, and reduce the probability of accidents.
At present, common vehicle-mounted radars mainly comprise ultrasonic radars, laser radars, millimeter wave radars and image sensors. The 77GHz millimeter wave radar has high measurement accuracy and smaller volume, and is a mainstream product developed at present. The antenna array is one of key devices of the millimeter wave vehicle radar, and the main forms include a dielectric integrated waveguide antenna, a lens antenna and a microstrip patch antenna. The feeding modes adopted by the dielectric integrated waveguide antenna and the microstrip patch antenna are coplanar side feeding, so that the radiation performance of the antenna is seriously influenced, and the microstrip patch antenna has larger dielectric loss and microstrip loss, so that the radiation efficiency is low.
Disclosure of Invention
The invention provides a 3D metallized vehicle millimeter wave radar antenna, a vehicle millimeter wave radar and an automobile, which realize horizontal polarization and high symmetry and smoothness of a radiation pattern under the horizontal polarization by a multilayer symmetrical metallized antenna structure and a feed mode from bottom to top.
Specifically, the 3D metallized vehicle millimeter wave radar antenna comprises a radiation layer, a coupling layer, a waveguide layer and a feed layer which are sequentially arranged from top to bottom, wherein adjacent layers are in seamless joint.
The radiation layer is provided with N radiation units which are linearly distributed along the long side direction of the radiation layer, wherein N is more than or equal to 2; the coupling layer is provided with waveguide units at the positions corresponding to the radiation units on one surface facing the radiation layer; the waveguide layer is internally provided with a resonant cavity on one surface facing the feed layer, and the resonant cavity is irregularly long-strip-shaped; a rectangular groove is arranged inwards on one surface facing the coupling layer, is aligned with the center of the waveguide unit, is basically parallel to the long side of the resonant cavity, and forms a through-center structure with the resonant cavity; the feed layer is provided with a rectangular waveguide at the center position of one surface facing the waveguide layer, the rectangular waveguide is used for feeding the waveguide layer, and the waveguide layer carries out coupling feed on the radiation unit of the radiation layer through the coupling layer.
Preferably, the rectangular grooves have the same width of 0.2-1mm, the height of 0.1-1mm and the length of 1.5-2.2mm. For the eight-unit rectangular groove, the total length of the resonant cavity is 18-23mm, the height is 0.5-1mm, and the width is 3.5-4.5mm.
Preferably, the feeding layer adopts a wave port feeding mode, the length of the cross section of the rectangular waveguide is 3.26mm, the width of the rectangular waveguide is 1.05mm, and the rectangular waveguide can have the cross section size when meeting the single-mode transmission condition in the frequency band of 76-81 GHz.
The vehicle millimeter wave radar antenna can be manufactured by adopting an integrated forming process, and the radiation layer, the coupling layer, the waveguide layer and the feed layer are all rectangular metal structure layers or surface metallization structures after plastic forming.
The radiation unit is a through-core structure penetrating from one surface of the radiation layer to the other surface, and the through-core structure is a cuboid structure or a quadrangular frustum pyramid structure; the cross section of the hollow waveguide quadrangular frustum structure along the thickness direction from the central axis of the short side of the radiation layer is trapezoid, and the rectangular surface where the long bottom edge of the trapezoid is positioned is flush with the surface of the radiation layer, which is away from the coupling layer; the rectangular surface where the short bottom side of the trapezoid is located is flush with the surface of the radiation layer facing the coupling layer.
The waveguide unit comprises a first rectangular waveguide and a second rectangular waveguide which are mutually matched into a T shape; the first rectangular waveguide is a transverse rectangular groove formed in the surface of the coupling layer; the long sides of the rectangular grooves of each first rectangular waveguide are equal, and the short sides of the rectangular grooves are sequentially reduced from the middle to the two sides; the short side of the middle rectangular groove does not exceed the length of the short side of the radiating unit; the second rectangular waveguide is provided with a rectangular through groove penetrating the coupling layer from the middle position of the long side of the rectangular groove towards the other side of the coupling layer; all second rectangular waveguides are equal in size, and the short sides of the second rectangular waveguides are smaller than the smallest short sides of the first rectangular waveguides.
Preferably, the resonant cavity is a hollow waveguide cavity, the waveguide layer realizes one-eighth power, and when the waveguide layer is fed from the center of the bottom by the rectangular waveguide, the hollow waveguide cavities are staggered, so that the consistency of the magnetic flow directions of eight rectangular grooves distributed along the axis is ensured; and the current distribution on the rectangular groove is close to chebyshev weighting distribution by optimizing the dimensions of the hollow waveguide cavity and the rectangular branches.
Wherein the center-to-center distance of any 2 adjacent radiating elements is equal to the center-to-center distance of the adjacent first rectangular waveguide and is equal to half the waveguide wavelength.
The resonant cavity consists of N single cavities which are staggered with each other, the single cavities are in a convex shape, and adjacent single cavities are mutually distributed in a reverse convex manner; the convex shapes of the same orientation are positioned on the same horizontal or vertical line, and the convex surface of one convex shape in the adjacent convex shapes is higher than the corresponding bottom plane of the other convex shape.
Rectangular branches are arranged on the bottom plane and close to the inner angles corresponding to the adjacent single cavity sides, the rectangular branches face the rectangular grooves, and an extension line where the central axes of the short sides of the rectangular branches are located forms an angle of 45 degrees with the horizontal or vertical line where the rectangular grooves are located, so that matching and power distribution can be adjusted.
The rectangular branches at the opposite positions of the two sides of the line where the rectangular grooves are located are grouped in pairs, N-1 groups are adopted, each group of rectangular branches isolates a single cavity, and the rectangular grooves are distributed at the center position of the single cavity.
As another preferred aspect, the present invention also provides a vehicle-mounted millimeter wave radar, which is a 3D metallized vehicle-mounted millimeter wave radar antenna as described above.
As another preferable aspect, the present invention also provides an automobile including the vehicle-mounted millimeter wave radar as described above, the vehicle-mounted millimeter wave radar being mounted anywhere in the automobile.
Finally, the invention provides a 3D metallized vehicle millimeter wave radar antenna, a vehicle millimeter wave radar and an automobile, wherein the vehicle millimeter wave radar antenna can be manufactured by adopting an integrated forming process and comprises a radiation layer, a coupling layer, a waveguide layer and a feed layer which are sequentially arranged from top to bottom, wherein each adjacent layer is in seamless joint, and each layer is of a metallized structure or a surface metallized structure after plastic forming; the radiation layer is provided with N radiation units; waveguide units are arranged at the positions of the coupling layers corresponding to the radiation units; the waveguide layer is provided with a resonant cavity, and a rectangular groove is arranged in the resonant cavity; the feed layer is provided with a rectangular waveguide, the waveguide transmission line is used for feeding the waveguide layer, and the waveguide layer carries out coupling feed on the radiation unit of the radiation layer through the coupling layer. The invention realizes the highly symmetrical smoothing of horizontal polarization and radiation pattern by using the antenna with the multilayer metallization structure.
Drawings
Fig. 1 is a 3D metallized vehicular millimeter wave radar antenna.
Fig. 2 is a plan view of a radiation layer.
Fig. 3 is a cross-sectional view of the short-side central axis of the radiation layer in the thickness direction.
Fig. 4 is a perspective view of a waveguide unit on a coupling layer.
Fig. 5 is a plan view of a waveguide layer.
Fig. 6 is a perspective view of a waveguide layer.
Fig. 7 is a plan view of a feed layer.
Fig. 8 is an S11 simulation graph of a 3D metallized vehicular millimeter wave radar antenna.
Fig. 9 is a simulated radiation pattern of the 3D metallized vehicular millimeter wave radar antenna at a frequency of 78.5 GHz.
The antenna comprises a 1-radiation layer, a 11-radiation unit, a 12-radiation layer short side, a 13-radiation unit short side, a 14-radiation unit long bottom side, a 15-radiation unit short bottom side, a 2-coupling layer, a 21-waveguide unit, a 22-first rectangular waveguide, a 23-second rectangular waveguide, a 24-first rectangular waveguide long side, a 25-first rectangular waveguide short side, a 3-waveguide layer, a 31-rectangular groove, a 32-resonant cavity, a 33-rectangular branch, a 34-single cavity, a 35-rectangular unit, a 36-resonant cavity long side, a 4-feed layer and a 41-rectangular waveguide.
Detailed Description
The 3D metallized vehicle millimeter wave radar antenna, the vehicle millimeter wave radar and the automobile of the invention are further described in detail below with reference to specific embodiments and drawings.
As shown in fig. 1, the 3D metallized vehicle millimeter wave radar antenna provided by the invention comprises a radiation layer 1, a coupling layer 2, a waveguide layer 3 and a feed layer 4 which are sequentially arranged from top to bottom, wherein adjacent layers are in seamless joint.
The vehicle millimeter wave radar antenna can be manufactured by adopting an integrated forming process, and the radiation layer 1, the coupling layer 2, the waveguide layer 3 and the feed layer 4 are all rectangular metal structure layers or surface metallization structures after plastic forming.
As shown in FIG. 2, the radiation layer 1 is provided with N radiation units 11 which are linearly distributed along the long side direction of the radiation layer 1, wherein N is more than or equal to 2.
The radiation unit 11 is a through-core structure penetrating from one surface of the radiation layer 1 to the other surface, and the through-core structure is a cuboid structure or a quadrangular frustum structure; the cross section of the hollow waveguide quadrangular frustum structure along the thickness direction from the central axis of the short side 12 of the radiation layer 1 is trapezoid, and the rectangular surface where the long bottom edge 14 of the trapezoid is positioned is flush with the surface of the radiation layer 1 away from the coupling layer 2; the rectangular surface on which the short base 15 of the trapezoid is located is flush with the surface of the side of the radiation layer 1 facing the coupling layer 2.
Preferably, the number of the radiation units 11 is set to 8, and the number may be set according to need, not limited thereto.
The coupling layer 2 is provided with waveguide units 21 at positions facing the radiation layer 1 and corresponding to the respective radiation units 11.
As shown in fig. 4, the waveguide unit 21 includes a first rectangular waveguide 22 and a second rectangular waveguide 23 that are mutually matched in a T shape; the first rectangular waveguide 22 is a transverse rectangular groove formed on the surface of the coupling layer 2; the long sides 24 of the rectangular grooves of each first rectangular waveguide 22 are equal, and the short sides 25 are rectangular grooves which are sequentially reduced from the middle to the two sides; the middle rectangular groove short side 25 does not exceed the length of the short side 13 of the radiating element 11; the second rectangular waveguides 23 are all second rectangular waveguides 23 with the same size, and the short sides thereof are smaller than the minimum short side of the first rectangular waveguide 22, wherein a rectangular through groove is formed from the middle position of the long side 24 of the rectangular groove toward the other side of the coupling layer 2 to penetrate the coupling layer 2.
Preferably, the short side 25 of the first rectangular waveguide 22 in the middle and the short side 13 of the radiating element 11 are equal in length.
Wherein the center-to-center distance of any 2 adjacent radiating elements 11 is equal to the center-to-center distance of adjacent first rectangular waveguides 22 and equal to half the waveguide wavelength.
As shown in fig. 5 and 6, the waveguide layer 3 is provided with a resonant cavity 32 facing the feed layer 4, and the resonant cavity 32 is irregularly long; a rectangular slot 31 is provided inwardly facing the coupling layer 2, said rectangular slot 31 being aligned with the centre of said waveguide unit 21, being substantially parallel to the long side 36 of the cavity 32 and forming a through-centre structure with said cavity 32.
Preferably, the number of the rectangular grooves 31 is 8, the width of the rectangular grooves 31 is 0.2-1mm, the height is 0.1-1mm, and the length is 1.5-2.2mm; the resonant cavity 32 is a hollow waveguide cavity, the total length is 18-23mm, the height is 0.5-1mm, and the width is 3.5-4.5mm; the sum of the height of the rectangular slot 31 and the resonator 32 is equal to the height of the waveguide layer 3.
The resonant cavity 32 is composed of N single cavities 34 which are staggered with each other, the single cavities 34 are in a convex shape, and adjacent single cavities 34 are mutually distributed in a reverse convex manner; the convex shapes of the same orientation are positioned on the same horizontal or vertical line, and the convex surface of one convex shape in the adjacent convex shapes is higher than the corresponding bottom plane of the other convex shape.
Wherein, the bottom planes of the single cavities 34 located at two sides of the resonant cavity 32 are respectively provided with a rectangular unit 35 at one side close to two short sides of the resonant cavity 32, and the rectangular units 35 are higher than the bottom planes.
Preferably, the length of the single lumen 34 is 2.3-2.8mm.
Rectangular branches 33 are formed at the bottom plane and near the inner corners corresponding to the sides of the adjacent single cavities 34, the rectangular branches 33 face the rectangular grooves 31, and the extension lines of the central axes of the short sides of the rectangular branches 33 and the horizontal or vertical lines of the rectangular grooves 31 form 45-degree angles for adjusting matching and power distribution.
Wherein the inner angle is two angles of the bottom plane of the convex single cavity 34, the rectangular branch 33 is arranged towards the rectangular groove 31 at the middle of the inner angle and the adjacent angle, and forms an angle of 45 degrees with the protruding surface of the resonant cavity 32
The rectangular branches 33 at the opposite positions of the two sides of the line where the rectangular grooves 31 are located are grouped into N-1 groups, each group of rectangular branches 33 isolates the single cavity 34, and the rectangular grooves 31 are distributed at the center of the single cavity 34.
Preferably, the waveguide layer 3 realizes one-eighth power, and when the waveguide layer is fed from the bottom center by the rectangular waveguide, the resonant cavities 32 are staggered, so that the magnetic current directions of 8 rectangular grooves 31 distributed along the axis are consistent; the current distribution on the rectangular slot 31 is then made to approach chebyshev weighting by optimizing the dimensions of the resonant cavity 32 and the rectangular stub 33.
As shown in fig. 7, the feeding layer 4 is provided with a rectangular waveguide 41 at a central position of a surface facing the waveguide layer 3, a rectangular waveguide 41 surface flush with the surface of the feeding layer 4 facing away from the waveguide layer 3 is provided with a waveguide port feeding, the rectangular waveguide 41 is used for feeding the waveguide layer 3, and the waveguide layer 3 carries out coupling feeding on a radiation unit of the radiation layer 1 through the coupling layer 2.
Preferably, the feeding layer adopts a wave port feeding mode, the length of the cross section of the rectangular waveguide 41 is 3.26mm, the width of the rectangular waveguide 41 is 1.05mm, and the cross section size of the rectangular waveguide 41 can be all the same when the rectangular waveguide 41 meets the single-mode transmission condition in the 76-81GHz frequency band; the wave port is arranged in the rectangular waveguide 41 and is flush with the side of the feed layer 4 away from the waveguide layer 3, or is arranged on the side of the rectangular waveguide 41 and the feed layer 4 away from the waveguide layer 3 and is slightly higher than the feed layer 4.
As another preferred aspect, the present invention also provides a vehicle-mounted millimeter wave radar, which is a 3D metallized vehicle-mounted millimeter wave radar antenna as described above.
As another preferable aspect, the present invention also provides an automobile including the vehicle-mounted millimeter wave radar as described above, the vehicle-mounted millimeter wave radar being mounted anywhere in the automobile.
Finally, the invention realizes horizontal polarization and high symmetry and smoothness of the radiation pattern under the horizontal polarization by arranging the multilayer symmetrical metallized antenna structure and the feed mode from bottom to top, and the 3D metallized vehicle-mounted millimeter wave radar antenna has excellent performances of wide frequency band, high gain, wide wave beam, low side lobe and the like.
In order to further illustrate the effectiveness of the 3D metalized vehicle-mounted millimeter wave radar antenna, the 3D metalized vehicle-mounted millimeter wave radar antenna is subjected to simulation calculation, and an S11 simulation graph of the 3D metalized vehicle-mounted millimeter wave radar antenna and a simulation radiation pattern of the 3D metalized vehicle-mounted millimeter wave radar antenna at a 78.5GHz frequency point are obtained.
In fig. 8, an S11 simulation graph of the 3D metallized vehicular millimeter wave radar antenna is provided, and the impedance bandwidth of the antenna of the invention at-10 dB is 75.19GHz-81.29GHz, so that the 3D metallized vehicular millimeter wave radar antenna can achieve the effect of wide frequency band, and compared with the prior art, the antenna is more optimized in terms of frequency bandwidth.
In fig. 9, a simulated radiation pattern of an E plane and an H plane of the 3D metallized vehicle millimeter wave radar antenna at a 78.5GHz frequency point is given, the implementation and the dotted line represent the patterns of the H plane and the E plane respectively, as can be seen from fig. 9, the antenna gain is 15.5dB, the 3dB beam width displayed on the H plane is 12.2 °, the 3dB beam width displayed on the E plane is 124 °, the side lobe electrical frequency is lower than-29 dB, and the 3D metallized vehicle millimeter wave radar antenna can achieve the effects of high gain, wide beam and low side lobe, which are more optimized in terms of gain, beam width and side lobe electrical frequency than in the prior art.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
While the invention has been described in conjunction with the specific embodiments above, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, all such alternatives, modifications, and variations are included within the spirit and scope of the following claims.
Claims (10)
1. The 3D metallized vehicle millimeter wave radar antenna is characterized by comprising a radiation layer (1), a coupling layer (2), a waveguide layer (3) and a feed layer (4) which are sequentially arranged from top to bottom, wherein adjacent layers are in seamless joint;
the radiation layer (1) is provided with N radiation units (11) which are linearly distributed along the long side direction of the radiation layer (1), wherein N is more than or equal to 2;
the coupling layer (2) is provided with waveguide units (21) at the positions which face the radiation layer (1) and correspond to the radiation units (11);
A resonant cavity (32) is arranged on one surface of the waveguide layer (3) facing the feed layer (4), and the resonant cavity (32) is irregularly long; a rectangular groove (31) is arranged inwards on one surface facing the coupling layer (2), the rectangular groove (31) is aligned with the center of the waveguide unit (21), is basically parallel to the long side (36) of the resonant cavity (32), and forms a through-center structure with the resonant cavity (32);
the feed layer (4) is provided with a rectangular waveguide (41) at the center position of one surface facing the waveguide layer (3), the rectangular waveguide (41) is used for feeding the waveguide layer (3), and the waveguide layer (3) carries out coupling feed on the radiation unit of the radiation layer (1) through the coupling layer (2).
2. The 3D metallized vehicular millimeter wave radar antenna according to claim 1, wherein the vehicular millimeter wave radar antenna is manufactured by an integrated molding process, and the radiation layer (1), the coupling layer (2), the waveguide layer (3) and the feed layer (4) are of a metallized structure or a surface metallized structure after plastic molding.
3. The 3D metallized vehicular millimeter wave radar antenna according to claim 2, characterized in that the radiating element (11) is a through-core structure penetrating from one side of the radiating layer (1) to the other side, the through-core structure being a cuboid structure or a quadrangular frustum of a prism structure;
The cross section of the quadrangular frustum pyramid structure along the thickness direction from the central axis of the short side (12) of the radiation layer is trapezoid, and the rectangular surface where the long bottom edge (14) of the trapezoid is positioned is flush with the surface of one surface of the radiation layer (1) away from the coupling layer (2); the rectangular surface of the short base (15) of the trapezoid is flush with the surface of the radiation layer (1) facing the coupling layer (2).
4. A 3D metallized vehicular millimeter wave radar antenna according to claim 3, characterized in that the waveguide unit (21) comprises a first rectangular waveguide (22) and a second rectangular waveguide (23) mutually cooperating in a T-shape; the first rectangular waveguide (22) is a rectangular groove formed in the surface of the coupling layer (2); the long sides (24) of the rectangular grooves of each first rectangular waveguide (22) are equal, and the short sides (25) of the first rectangular waveguides are rectangular grooves which are sequentially reduced from the middle to the two sides; the first rectangular waveguide short side (25) of the middle rectangular groove does not exceed the length of the radiation unit short side (13);
The second rectangular waveguide (23) is provided with a rectangular through groove penetrating the coupling layer (2) from the middle position of the long side (24) of the rectangular groove towards the other side of the coupling layer (2); all second rectangular waveguides (23) are equal in size with their short sides smaller than the smallest short side dimension of the first rectangular waveguide (22).
5. The 3D metallized vehicular millimeter wave radar antenna according to claim 4, characterized in that the distance between any 2 adjacent radiating elements (11) is equal to the distance between adjacent first rectangular waveguides (22) and equal to half the waveguide wavelength.
6. The 3D metallized vehicular millimeter wave radar antenna of claim 5, wherein the resonant cavity (32) is composed of N single cavities (34) arranged in a staggered manner, the single cavities (34) are convex, and adjacent single cavities (34) are distributed in a mutually opposite convex manner; the convex shapes of the same orientation are positioned on the same horizontal or vertical line, and the convex surface of one convex shape in the adjacent convex shapes is higher than the corresponding bottom plane of the other convex shape.
7. The 3D metallized vehicular millimeter wave radar antenna according to claim 6, wherein a rectangular branch (33) is opened at the bottom plane and near the inner angle corresponding to the adjacent single cavity (34) side, the rectangular branch (33) faces the rectangular slot (31), and the extension line of the central axis of the short side of the rectangular branch (33) forms an angle of 45 ° with the horizontal or vertical line of the rectangular slot (31) for adjusting matching and power distribution.
8. The 3D metallized vehicular millimeter wave radar antenna according to claim 7, wherein the rectangular branches (33) at opposite positions on both sides of the line where the rectangular grooves (31) are located are grouped in pairs, N-1 groups are used, each group of rectangular branches (33) isolates a single cavity (34), and the rectangular grooves (31) are distributed at the center position of the single cavity (34).
9. A vehicle millimeter wave radar comprising a 3D metallized vehicle millimeter wave radar antenna according to any one of claims 1 to 8.
10. An automobile comprising the in-vehicle millimeter wave radar according to claim 9, the in-vehicle millimeter wave radar being mounted anywhere in the automobile.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106876901A (en) * | 2017-03-28 | 2017-06-20 | 南京大学（苏州）高新技术研究院 | A 77GHz millimeter wave automotive anti-collision radar antenna |
| CN110224224A (en) * | 2019-04-30 | 2019-09-10 | 惠州市德赛西威智能交通技术研究院有限公司 | A kind of broad beam 77GHz millimeter wave vehicle radar antenna |
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| JPH02302104A (en) * | 1989-05-16 | 1990-12-14 | Arimura Giken Kk | Square waveguide slot array antenna |
| JP6067445B2 (en) * | 2013-03-26 | 2017-01-25 | 三菱電機株式会社 | Radar equipment |
| CN112103657A (en) * | 2020-11-10 | 2020-12-18 | 网络通信与安全紫金山实验室 | Dual-polarized four-ridge waveguide array antenna |
| CN114447632A (en) * | 2022-01-19 | 2022-05-06 | 深圳市道通智能汽车有限公司 | A microstrip string-fed array antenna and vehicle-mounted millimeter-wave radar |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106876901A (en) * | 2017-03-28 | 2017-06-20 | 南京大学（苏州）高新技术研究院 | A 77GHz millimeter wave automotive anti-collision radar antenna |
| CN110224224A (en) * | 2019-04-30 | 2019-09-10 | 惠州市德赛西威智能交通技术研究院有限公司 | A kind of broad beam 77GHz millimeter wave vehicle radar antenna |
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