Feed structure, millimeter wave radar antenna and automobile

Abstract

The invention discloses a feed structure, a millimeter wave radar antenna and an automobile, and relates to the field of antennae, the feed structure comprises a connection section, a conversion section and a grounding copper column row, the connection section and the conversion section are connected along the length direction and each comprise a first metal layer, a substrate and a second metal layer which are arranged along the height direction, the first metal layer comprises a first connecting part, a microstrip line and a second connecting part which are sequentially arranged at intervals in the width direction; the grounding copper column bar comprises a first copper column bar and a second copper column bar which are arranged on two sides of the microstrip line, two ends of the first copper column bar are connected with the first connecting part and the second metal layer, and two ends of the second copper column bar are connected with the second connecting part and the second metal layer; the connecting section comprises a first end far away from the conversion section and a second end connected with the conversion section, the first end is used for feed connection, the distance between the first end and the grounding copper column rows is smaller than that in the second end, the width of the microstrip line and the distance between the grounding copper column rows change correspondingly, and the width of the microstrip line of the conversion section is gradually increased in the direction far away from the connecting section.

Description

Technical Field

[0001] The present invention relates to the field of antenna technology, and in particular to a feeding structure, a millimeter wave radar antenna and a car. Background Art

[0002] Millimeter waves refer to electromagnetic waves with a wavelength between 1 mm and 10 mm, and the corresponding frequency range is approximately between 30 GHz and 300 GHz. Electromagnetic waves in this frequency band have a series of unique properties, making them very suitable for use in radar systems. With the development of technology, millimeter-wave radars are becoming more and more economical, smaller, and easier to integrate into existing systems, playing a key role in automotive safety systems. The design and implementation of millimeter-wave radar systems require precise feeding structures to ensure effective transmission and reception of signals, which is an important prerequisite for achieving high-performance radar systems.

[0003] Most of the current mainstream 77GHz millimeter wave radars use planar printed antennas made of high-frequency dielectric plates, which are not only expensive, but also have high dielectric plate losses. In addition, since the dielectric constant of the dielectric plate fluctuates with the processing technology, the antenna has high losses during the feeding transmission process, resulting in a decrease in the efficiency of the millimeter wave radar. Summary of the invention

[0004] The main purpose of the present invention is to propose a feeding structure, a millimeter-wave radar antenna and a car, aiming to reduce the loss of the antenna during the feeding transmission process and improve the efficiency of the millimeter-wave radar antenna.

[0005] To achieve the above object, the feeding structure proposed in the present invention includes:

[0006] Connecting segment;

[0007] A conversion section, wherein the connection section and the conversion section are sequentially connected along the length direction of the connection section, the connection section and the conversion section both include a first metal layer, a substrate and a second metal layer sequentially arranged along the height direction of the connection section, and the first metal layer includes a first connection portion, a microstrip line and a second connection portion sequentially arranged at intervals along the width direction of the connection section;

[0008] A grounding copper column row, the grounding copper column row comprising a first copper column row and a second copper column row respectively arranged on both sides of the microstrip line, the first copper column row having two ends in the axial direction connected to the first connection portion and the second metal layer respectively, and the second copper column row having two ends in the axial direction connected to the second connection portion and the second metal layer respectively;

[0009] The connecting section includes a first end away from the conversion section and a second end used to connect the conversion section, the first end is used for feeding connection, the spacing between the first copper column row and the second copper column row in the first end is smaller than the spacing between the first copper column row and the second copper column row in the second end, the width of the microstrip line changes correspondingly with the spacing between the first copper column row and the second copper column row, and the width of the microstrip line on the conversion section gradually increases in a direction away from the connecting section.

[0010] In one embodiment, the connecting section includes a first section, a second section, and a third section connected in sequence along a direction close to the conversion section, and the projections of the microstrip lines of the first section and the third section on the substrate are both rectangular structures, and the width of the microstrip line gradually increases along a direction close to the third section.

[0011] In one implementation, the diameter of the grounding copper pillar is d, the distance between the centers of two adjacent grounding copper pillars along the length direction of the connecting section is p, and 2≤p / d≤4.

[0012] In one implementation, the feeding structure is manufactured and formed by using LDS-MID technology.

[0013] In one embodiment, metal layers are provided on both sides of the conversion section along the length direction.

[0014] The present invention also provides a millimeter wave radar antenna, wherein the millimeter wave radar comprises the above-mentioned feeding structure;

[0015] a dielectric waveguide port; and

[0016] A horn antenna, wherein two ends of the dielectric waveguide opening along the length direction are respectively connected to the conversion section and the horn antenna.

[0017] In one implementation, the bottom surface of the horn antenna is parallel to the bottom surface of the second metal layer, and the height of the horn antenna gradually increases in a direction away from the dielectric waveguide opening.

[0018] In one embodiment, the horn antenna includes a right-angle segment and a curved segment, the right-angle segment is connected to the dielectric waveguide port, the curved segment is connected to one end of the right-angle segment away from the dielectric waveguide port, and the side of the curved segment facing away from the right-angle segment is a curved structure.

[0019] In one embodiment, the feed structure, the dielectric waveguide port and the horn antenna form an antenna unit, the millimeter wave radar antenna includes a plurality of the antenna units, and each feed structure is an integrated structure.

[0020] The present invention also provides a car, comprising the above-mentioned millimeter-wave radar antenna.

[0021] The technical solution of the present invention proposes a feeding structure for a millimeter wave radar antenna, which includes a connecting section and a conversion section, and the two parts are connected in sequence along the length direction of the feeding structure. The connecting section and the conversion section both include a first metal layer, a substrate, and a second metal layer. This structure provides a good transmission path and shielding effect for the antenna signal. The first metal layer, the substrate, the second metal layer, and the grounding copper column row form a ground waveguide structure to facilitate impedance matching adjustment, and the first copper column row and the second copper column row on both sides of the microstrip line are used to block the electromagnetic signal, thereby reducing the electromagnetic leakage of the antenna signal during transmission. The width of the microstrip line gradually expands in the direction away from the connecting section, which is conducive to the formation of the radiation pattern of the signal, so that the signal can be more effectively output from the feeding structure, reducing the loss of the antenna during transmission and improving the efficiency of the antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] Figure 1 A schematic structural diagram of an embodiment of a feeding structure provided by the present invention;

[0024] Figure 2 for Figure 1 A top view of the middle connecting section;

[0025] Figure 3 for Figure 1 A partial enlarged schematic diagram of the middle connecting section;

[0026] Figure 4 It is a schematic diagram of the structure of the horn antenna before optimization in the present invention;

[0027] Figure 5 It is a schematic diagram of the structure of the optimized horn antenna in the present invention;

[0028] Figure 6 This is a schematic diagram of the propagation path simulation of the electromagnetic signal without adding a curved surface segment to the horn antenna;

[0029] Figure 7 Schematic diagram of the propagation path simulation of the electromagnetic signal after adding a curved surface segment to the horn antenna;

[0030] Figure 8 A schematic diagram of a reflection coefficient test result according to an embodiment of the present invention;

[0031] Fig. 9It is a schematic diagram of a directivity coefficient simulation structure according to an embodiment of the present invention.

[0032] Description of Figure Numbers:

[0033] 1000. Millimeter-wave radar antenna; 100. Feed structure; 1. Connecting section; 1a. First section; 1b. Second section; 1c. Third section; 11. First metal layer; 111. First connecting portion; 112. Microstrip line; 113. Second connecting portion; 12. Substrate; 13. Second metal layer; 2. Transition section; 3. Grounding copper column row; 31. First copper column row; 32. Second copper column row; 4. Dielectric waveguide port; 5. Horn antenna; 51. Right-angle section; 52. Arc section.

[0034] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0037] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] Millimeter waves refer to electromagnetic waves with a wavelength between 1 mm and 10 mm, and the corresponding frequency range is approximately between 30 GHz and 300 GHz. Electromagnetic waves in this frequency band have a series of unique properties, making them very suitable for use in radar systems. With the development of technology, millimeter-wave radars are becoming more and more economical, smaller, and easier to integrate into existing systems, playing a key role in automotive safety systems. The design and implementation of millimeter-wave radar systems require precise feeding structures to ensure effective transmission and reception of signals, which is an important prerequisite for achieving high-performance radar systems.

[0039] Most of the current mainstream 77GHz millimeter wave radars use planar printed antennas made of high-frequency dielectric plates, which are not only expensive, but also have high dielectric plate losses. In addition, since the dielectric constant of the dielectric plate fluctuates with the processing technology, the antenna has high losses during the feeding transmission process, resulting in a decrease in the efficiency of the millimeter wave radar.

[0040] To solve the above problems, please refer to Figures 1 to 9 The present invention proposes a feeding structure 100, comprising a connecting section 1, a conversion section 2 and a grounding copper column row 3, wherein the connecting section 1 and the conversion section 2 are sequentially connected along the length direction of the connecting section 1, and the connecting section 1 and the conversion section 2 each comprise a first metal layer 11, a substrate 12 and a second metal layer 13 sequentially arranged along the height direction of the connecting section 1, and the first metal layer 11 comprises a first connecting portion 111, a microstrip line 112 and a second connecting portion 113 sequentially arranged along the width direction of the connecting section 1; the grounding copper column row 3 comprises a first copper column row 31 and a second copper column row 32 respectively arranged on both sides of the microstrip line 112, and the two ends of the first copper column row 31 along the axial direction are respectively The first connecting portion 111 is connected to the second metal layer 13, and the second copper column row 32 is connected to the second connecting portion 113 and the second metal layer 13 at two ends along the axial direction respectively; the connecting section 1 includes a first end away from the conversion section 2 and a second end used to connect the conversion section 2, the first end is used for feeding connection, the spacing between the first copper column row 31 and the second copper column row 32 in the first end is smaller than the spacing between the first copper column row 31 and the second copper column row 32 in the second end, the width of the microstrip line 112 changes correspondingly with the spacing between the first copper column row 31 and the second copper column row 32, and the width of the microstrip line 112 on the conversion section 2 gradually increases in the direction away from the connecting section 1.

[0041] The technical solution of the present invention proposes a feeding structure 100 for a millimeter wave radar antenna 1000, which includes a connecting section 1 and a conversion section 2, which are sequentially connected along the length direction of the feeding structure 100. The connecting section 1 and the conversion section 2 both include a first metal layer 11, a substrate 12, and a second metal layer 13. In this solution, the first metal layer 11 and the second metal layer 13 are copper layers, and the substrate 12 is a plastic structure. This structure provides a good transmission path and shielding effect for the antenna signal. The first metal layer 11, the substrate 12, the second metal layer 13, and the grounding copper column row 3 form a ground waveguide structure to facilitate impedance matching adjustment, and the first copper column row 31 and the second copper column row 32 on both sides of the microstrip line 112 are used to block the electromagnetic signal, thereby reducing the electromagnetic leakage of the antenna signal during transmission. The width of the microstrip line 112 gradually expands in the direction away from the connecting section 1, which is conducive to the formation of the radiation mode of the signal, so that the signal can be more effectively output from the feeding structure 100, reducing the loss of the antenna during transmission and improving the efficiency of the antenna.

[0042] In an optional embodiment, to facilitate impedance matching of the connection section 1, please refer to Figures 1 to 3 , the connection section 1 includes the first section 1a, the second section 1b and the third section 1c in sequence along the direction close to the conversion section 2. The projections of the microstrip line 112 of the first section 1a and the third section 1c on the substrate 12 are both rectangular structures. Along the direction close to the third section 1c, the width of the microstrip line 112 gradually increases. In this solution, the first section 1a in the connection section 1 is used to connect with the chip. The grounded coplanar waveguide formed by the connection section 1 can well solve the connection problem. By adjusting the height of the substrate 12, the width of the microstrip line 112, and the gap width between the microstrip line 112 and the first connection part 111 and the second connection part 113, an impedance matching value of 50 ohms can be obtained, thereby minimizing the signal loss during transmission. Since the corresponding connection structure on the chip is mostly fixed in size, the size of the first section 1a generally corresponds to the size of the connection structure on the chip. That is to say, the size of the first section 1a is a fixed size, and the third section 1c is used to connect with the conversion section 2. The first section 1a and the third section 1c are set as a rectangular structure, so that the signal has a certain buffer distance after entering the first section 1a and before leaving the third section 1c to achieve smooth transmission. In addition, in order to facilitate the transition of the signal from the connection section 1 to the conversion section 2, the second section 1b is additionally set between the first section 1a and the third section 1c to achieve the transmission transition of the signal.

[0043] In this embodiment, the cross-sectional shape of the second section 1b is a flared structure with a straight line boundary. From the first section 1a to the direction close to the third section 1c, the width of the microstrip line 112 gradually increases, and correspondingly, the spacing between the first copper column row 31 and the second copper column row 32 also increases. The spacing between the first copper column row 31 and the second copper column row 32 changes accordingly with the change in the width of the microstrip line 112. In this way, while ensuring stable signal transmission, the first copper column row 31 and the second copper column row 32 can block the signal, thereby reducing signal leakage during transmission. Reduce the loss of antenna signals during transmission and improve signal transmission efficiency.

[0044] In other embodiments, the width of the microstrip line 112 in the second section 1b, and the spacing between the first copper column row 31 and the second copper column row 32, can also be a flared structure with other boundary shapes, such as an arc structure with a concave or convex boundary, which can also realize the transition of the signal during the transmission process. The structure with a straight boundary is simpler than the structure of other shapes, and is relatively easier to form during the production process. It is also easier to control the quality of the product during mass production. Therefore, a transition structure with a straight boundary is adopted in this embodiment. In short, the width of the microstrip line 112 gradually increases in the direction close to the third section 1c. It not only helps to achieve a gradual transition of the signal and reduce potential signal distortion, but also helps to match the impedance of different parts, reduce the reflection of the signal during the transmission process, and improve the transmission efficiency of the signal. Make the feeding structure 100 more adaptable to the signal transmission requirements of different frequencies and powers, thereby improving the overall performance of the millimeter wave radar antenna 1000.

[0045] Further, in order to improve the signal blocking effect of the first copper column row 31 and the second copper column row 32, thereby reducing the signal loss during the transmission process as much as possible, please refer to Figures 1 to 3 , the diameter of the grounding copper pillar is d, the center distance between two adjacent grounding copper pillars along the length direction of the connecting section 1 is p, 2≤p / d≤4. The setting of this proportional range is based on the electromagnetic principles and signal shielding effect. By precisely controlling the size and spacing of the grounding copper pillars, the interference of the signal during transmission can be effectively reduced, and the integrity and stability of the signal can be improved. The setting of this proportional range helps to achieve optimal electromagnetic compatibility while maintaining a compact structure, thereby improving the signal transmission quality of the millimeter wave radar antenna 1000 and the overall performance of the system.

[0046] In an optional embodiment, in order to facilitate the preparation and molding of the feed structure 100, the feed structure 100 is prepared and molded using LDS-MID technology. The principle of LDS-MID technology is to use a plastic material containing special additives to form the required components by injection molding. Then, a laser beam is used to irradiate specific areas of these plastic parts to activate the additives therein. In the subsequent metallization process, metal elements such as copper are deposited on the laser-processed surface to form a conductive pattern. Thereby, a high-precision three-dimensional circuit is formed on the plastic surface. The LDS (laser direct molding) technology allows metal patterns to be directly formed on three-dimensional plastic parts, while the MID technology integrates electronic circuits directly into plastic parts. The combined use of this technology can achieve a high-precision, high-density circuit structure while maintaining the lightweight and miniaturization of the structure. This preparation method not only improves the performance and reliability of the feed structure 100, but also helps to reduce production costs and improve production efficiency. Through this advanced preparation technology, a more complex and sophisticated circuit design can be achieved, thereby meeting the needs of the millimeter wave radar antenna 1000 for a high-performance feed structure 100.

[0047] In an optional embodiment, in order to reduce the loss of the antenna signal at the conversion section 2, a metal layer is provided on both sides of the conversion section 2 along the length direction. The presence of the metal layer can enhance the electromagnetic compatibility of the structure, reduce the interference of the signal during the transmission process, and improve the stability and reliability of the signal. At the same time, the metal layer can also serve as a heat dissipation path to help disperse and conduct the heat generated by the signal transmission, thereby protecting sensitive electronic components from overheating. By arranging metal layers on both sides of the conversion section 2 to replace the first copper column row 31 and the second copper column row 32, on the one hand, the signal can be blocked and shielded, and the loss during the signal transmission process can be reduced. On the other hand, it is convenient to integrate multiple feeding structures 100, so that when connecting multiple feeding structures 100 together, it is only necessary to set metal layers on both sides of the edge to achieve the shielding effect of the signal, which facilitates the integrated design of the millimeter wave radar, and is simpler and more convenient than the production of the grounding copper column row 3, and is convenient for production operation.

[0048] The present invention also proposes a millimeter wave radar antenna 1000, which includes a feeding structure 100, a dielectric waveguide port 4 and a horn antenna 5, wherein the two ends of the dielectric waveguide port 4 along the length direction are respectively connected to the conversion section 2 and the horn antenna 5. The specific structure of the feeding structure 100 refers to the above embodiment. Since the millimeter wave radar antenna 1000 adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. The combined use of the feeding structure 100 with the dielectric waveguide port 4 and the horn antenna 5 helps to achieve the high directivity, high gain and low sidelobe characteristics of the millimeter wave radar antenna 1000, which is crucial to improving the target detection capability and anti-interference capability of the radar system. By accurately controlling the transmission and radiation of the signal, this antenna design can improve the radar system's ability to identify and track targets, thereby improving the safety of the car and the performance of the driving assistance system.

[0049] Furthermore, to facilitate the installation of the horn antenna 5, the bottom surface of the horn antenna 5 is parallel to the bottom surface of the second metal layer 13, and the height of the horn antenna 5 gradually increases in the direction away from the dielectric waveguide port 4. In general, in order to ensure that the propagation direction of the electromagnetic wave is straight ahead (parallel to the ground), the shape of the horn antenna 5 is a horn-shaped radiating outward, such as Figure 4 As shown, this will cause the horn antenna 5 to be unable to be fixed and its waveguide port will be suspended and unable to connect to the chip. Therefore, in this solution, the structure of the horn antenna 5 is optimized, such as Figure 5 As shown, by cutting off the lower half of the horn antenna 5 so that it is flush with the bottom surface of the feeding structure 100, the millimeter wave radar can be attached to the radar board and connected to the chip, thereby effectively controlling the radiation direction and beam width of the signal and improving the performance of the radar system.

[0050] To further optimize the transmission path of electromagnetic waves, the horn antenna 5 includes a right-angle section 51 and a curved section 52. The right-angle section 51 is connected to the dielectric waveguide port 4, and the curved section 52 is connected to one end of the right-angle section 51 away from the dielectric waveguide port 4. The side of the curved section 52 facing away from the right-angle section 51 is a curved structure. Figure 5 and Figure 6 When the lower part of the horn antenna 5 is removed, the distances of electromagnetic wave propagation in paths a and b are different, so the time it takes for the electromagnetic wave to pass through the medium is also different, which will cause the electromagnetic wave propagation direction of the antenna to no longer be parallel to the ground, but to propagate slightly upward. In order to optimize the propagation direction of the electromagnetic wave to achieve better signal transmission effect, please refer to Figure 1 and Figure 7By setting a curved surface segment 52 at the tail of the horn antenna 5, the curved surface segment 52 slows down the propagation speed of the path b, so that the time required for the paths a and b to propagate into the air is similar, thereby achieving the effect of correcting the transmission direction of the electromagnetic wave. Figure 6 and Figure 7 Schematic diagrams of electromagnetic wave propagation path simulation before and after adding the arc surface segment 52, respectively. Figure 6 It can be seen that when the arc segment 52 is not added, at the tail of the horn antenna 5, the upper electromagnetic wave of the same electromagnetic wave obviously lags behind the lower electromagnetic wave, resulting in Figure 6 The propagation direction of the electromagnetic wave is obliquely upward, which is the result of the electromagnetic wave propagation path in direction a being longer than the propagation path in direction b. After adding the arc segment 52 to the tail of the horn antenna 5, please refer to Figure 7 , the arc segment 52 slows down the propagation speed of the electromagnetic wave in the b direction. It can be seen that the upper and lower parts of the same beam of electromagnetic waves basically maintain the effect of synchronous transmission, so that the electromagnetic waves basically propagate in the horizontal direction. This optimizes the transmission path of the electromagnetic waves and makes the horn antenna 5 have better directionality. Optionally, in the present embodiment, the cross-section of the arc segment 52 is a concave arc structure. In other embodiments, the cross-section of the arc segment 52 can also be a convex arc structure. The specific selection can be made according to actual needs. By optimizing the structure of the horn antenna 5, the phase error of the signal during transmission is reduced, and the transmission quality of the signal is improved. Optimizing the signal transmission path helps to improve the radar system's ability to identify and track targets, thereby improving the safety of the vehicle and the performance of the driving assistance system. Please refer to Figure 8 and Fig. 9 , Figure 8 This is a schematic diagram of the reflection coefficient results of an embodiment of the horn antenna 5 with the arc segment 52 in the present solution. The impedance matching of the corresponding horn antenna 5 is 50 ohms. It can be seen from the figure that the reflection coefficient is lower than -18 dB in the range of 76 GHz to 81 GHz. Fig. 9 Schematic diagram of the directivity coefficient simulation structure of the horn antenna 5. It can be seen from the figure that the directivity coefficient at the center frequency reaches 11.67dBi, and the actual gain of the antenna reaches 8.33dBi, which has good directivity and gain.

[0051] In an optional embodiment, in order to facilitate the integrated design of the millimeter wave radar antenna 1000, a feed structure 100, a dielectric waveguide port 4 and a horn antenna 5 form an antenna unit. A millimeter wave radar antenna 1000 includes multiple antenna units, and each feed structure 100 is an integrated structure. This design helps to realize the modularization and integration of the millimeter wave radar antenna 1000, simplifies the production and assembly process, and improves production efficiency. At the same time, the integrated structure helps to reduce the complexity of the connection between components and improve the stability and reliability of the overall structure. Through this modular design, it is easier to maintain and replace the antenna unit, thereby reducing maintenance costs and improving system reliability.

[0052] The present invention also proposes a car, which includes a millimeter wave radar antenna 1000. The millimeter wave radar antenna 1000 is integrated into the car, which can provide the car with key sensors required for advanced driver assistance systems, such as adaptive cruise control, collision warning, blind spot detection and other functions. By integrating the high-performance millimeter wave radar antenna 1000 into the car, the safety and intelligence level of the car can be improved, and a more comfortable and safe driving experience can be provided for the driver. This integrated design not only improves the performance of the car, but also helps to improve the comfort and satisfaction of passengers. The specific structure of the millimeter wave radar antenna 1000 refers to the above embodiment. Since the car adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0053] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A feeding structure for a millimeter wave radar antenna, characterized in that: include: Connecting segment; A conversion section, wherein the connection section and the conversion section are sequentially connected along the length direction of the connection section, the connection section and the conversion section both include a first metal layer, a substrate and a second metal layer sequentially arranged along the height direction of the connection section, and the first metal layer includes a first connection portion, a microstrip line and a second connection portion sequentially arranged at intervals along the width direction of the connection section; A grounding copper column row, the grounding copper column row comprising a first copper column row and a second copper column row respectively arranged on both sides of the microstrip line, the first copper column row having two ends in the axial direction connected to the first connection portion and the second metal layer respectively, and the second copper column row having two ends in the axial direction connected to the second connection portion and the second metal layer respectively; The connecting section includes a first end away from the conversion section and a second end used to connect the conversion section, the first end is used for feeding connection, the spacing between the first copper column row and the second copper column row in the first end is smaller than the spacing between the first copper column row and the second copper column row in the second end, the width of the microstrip line changes correspondingly with the spacing between the first copper column row and the second copper column row, and the width of the microstrip line on the conversion section gradually increases in a direction away from the connecting section.

2. The feeding structure according to claim 1, characterized in that: The connecting section includes a first section, a second section and a third section connected in sequence along a direction close to the conversion section. The projections of the microstrip lines of the first section and the third section on the substrate are both rectangular structures. Along the direction close to the third section, the width of the microstrip line gradually increases.

3. The feeding structure according to claim 2, characterized in that: The diameter of the grounding copper pillar is d, and the distance between the centers of two adjacent grounding copper pillars along the length direction of the connecting section is p, and 2≤p / d≤4.

4. The feeding structure according to claim 1, characterized in that: The feeding structure is prepared and formed by adopting LDS-MID technology.

5. The feeding structure according to claim 1, characterized in that: The conversion section is provided with metal layers on both sides along the length direction.

6. A millimeter wave radar antenna, characterized in that: include: The feeding structure according to any one of claims 1 to 5; Dielectric waveguide port; as well as A horn antenna, wherein two ends of the dielectric waveguide opening along the length direction are respectively connected to the conversion section and the horn antenna.

7. The millimeter wave radar antenna according to claim 6, characterized in that: The bottom surface of the horn antenna is parallel to the bottom surface of the second metal layer, and the height of the horn antenna gradually increases in a direction away from the dielectric waveguide opening.

8. The millimeter wave radar antenna according to claim 6, characterized in that: The horn antenna comprises a right-angle section and a curved surface section, wherein the right-angle section is connected to the dielectric waveguide opening, the curved surface section is connected to one end of the right-angle section away from the dielectric waveguide opening, and the side of the curved surface section facing away from the right-angle section is a curved surface structure.

9. The millimeter wave radar antenna according to claim 6, characterized in that: A feed structure, a dielectric waveguide port and a horn antenna form an antenna unit, a millimeter wave radar antenna includes a plurality of antenna units, and each feed structure is an integrated structure.

10. An automobile, characterized in that: It comprises the millimeter wave radar antenna as claimed in any one of claims 6 to 9.

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