Feed structure, millimeter-wave radar antenna and automobile

Abstract

This invention discloses a feeding structure, a millimeter-wave radar antenna, and an automobile, relating to the antenna field. The feeding structure includes a connecting section, a switching section, and a grounding copper column array. The connecting section and the switching section are connected along the length direction and each includes a first metal layer, a substrate, and a second metal layer arranged along the height direction. The first metal layer includes a first connecting portion, a microstrip line, and a second connecting portion arranged sequentially at intervals along the width direction. The grounding copper column array includes a first copper column array and a second copper column array disposed on both sides of the microstrip line. The first copper column array is connected to the first connecting portion and the second metal layer at both ends, and the second copper column array is connected to the second connecting portion and the second metal layer at both ends. The connecting section includes a first end away from the switching section and a second end connected to the switching section. The first end is used for feeding connection. The spacing of the grounding copper column arrays at the first end is smaller than the spacing within the second end. The width of the microstrip line changes correspondingly to the spacing between the grounding copper column arrays. The width of the microstrip line in the switching section gradually increases along the direction away from the connecting section.

Description

Technical Field

[0001] This invention relates to the field of antenna technology, and in particular to a feeding structure, a millimeter-wave radar antenna, and an automobile. Background Technology

[0002] Millimeter waves refer to electromagnetic waves with wavelengths between 1 and 10 millimeters, corresponding to a frequency range of approximately 30 GHz to 300 GHz. This frequency band possesses a series of unique properties, making it highly suitable for radar systems. With technological advancements, millimeter-wave radar is becoming increasingly economical, smaller, and easier to integrate into existing systems, playing a crucial role in automotive safety systems. The design and implementation of millimeter-wave radar systems require precise feed structures to ensure effective signal transmission and reception, a vital prerequisite for achieving high-performance radar systems.

[0003] Most mainstream 77GHz millimeter-wave radars currently use planar printed antennas made of high-frequency dielectric substrates, which are not only expensive but also have significant dielectric loss. Furthermore, because the dielectric constant of the dielectric substrate fluctuates depending on the manufacturing process, the antenna experiences substantial loss during power transmission, leading to a decrease in the efficiency of the millimeter-wave radar. Summary of the Invention

[0004] The main objective of this invention is to propose a feeding structure, a millimeter-wave radar antenna, and an automobile, aiming to reduce antenna losses during the feeding transmission process and improve the efficiency of the millimeter-wave radar antenna.

[0005] To achieve the above objectives, the present invention proposes a power supply structure comprising:

[0006] Connecting segment;

[0007] The transition segment is connected to the connecting segment along the length of the connecting segment. Both the connecting segment and the transition segment include a first metal layer, a substrate, and a second metal layer arranged sequentially along the height of the connecting segment. The first metal layer includes a first connecting portion, a microstrip line, and a second connecting portion arranged at intervals along the width of the connecting segment.

[0008] The grounding copper column includes a first copper column and a second copper column respectively disposed on both sides of the microstrip line. The first copper column is connected to the first connecting part and the second metal layer at both ends along the axial direction, and the second copper column is connected to the second connecting part and the second metal layer at both ends along the axial direction.

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

[0010] In one embodiment, the connecting segment sequentially includes a first segment, a second segment, and a third segment along the direction close to the transition segment. The projections of the microstrip lines of the first segment and the third segment onto the substrate are both rectangular structures, and the width of the microstrip lines gradually increases along the direction close to the third segment.

[0011] In one embodiment, the diameter of the grounding copper post is d, and the center distance between two adjacent grounding copper posts along the length of the connecting segment is p, where 2≤p / d≤4.

[0012] In one embodiment, the power supply structure is fabricated using LDS-MID technology.

[0013] In one embodiment, the transition section has metal layers on both sides along its length.

[0014] The present invention also proposes a millimeter-wave radar antenna, wherein the millimeter-wave radar includes the feeding structure described above;

[0015] Dielectric waveguide port; and

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

[0017] In one embodiment, 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 the direction away from the dielectric waveguide port.

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

[0019] In one embodiment, a feeding structure, a dielectric waveguide port, and a horn antenna constitute an antenna unit, and a millimeter-wave radar antenna includes multiple antenna units, with each feeding structure being an integral structure.

[0020] The present invention also proposes a vehicle comprising the millimeter-wave radar antenna described above.

[0021] The present invention proposes a feeding structure for a millimeter-wave radar antenna. This structure includes a connecting section and a switching section, which are connected sequentially along the length of the feeding structure. Both the connecting section and the switching section 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. A grounded waveguide structure is formed by the first metal layer, the substrate, the second metal layer, and the grounded copper pillars to facilitate impedance matching. Furthermore, the first and second copper pillars on both sides of the microstrip line block electromagnetic signals, reducing electromagnetic leakage during transmission. The gradually increasing width of the microstrip line away from the connecting section helps in the formation of signal radiation modes, allowing the signal to be output more effectively from the feeding structure, reducing antenna loss during transmission and improving antenna efficiency. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 A schematic diagram of an embodiment of the power supply structure provided by the present invention;

[0024] Figure 2 for Figure 1 Top view of the connecting section;

[0025] Figure 3 for Figure 1 A partially enlarged schematic diagram of the connecting segment;

[0026] Figure 4 This is a schematic diagram of the horn antenna before optimization in this invention;

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

[0028] Figure 6 A schematic diagram simulating the propagation path of electromagnetic signals from a horn antenna without the addition of an arc segment;

[0029] Figure 7 A schematic diagram simulating the propagation path of electromagnetic signals after adding a curved section to a horn antenna;

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

[0031] Figure 9This is a schematic diagram of a directional coefficient simulation structure according to an embodiment of the present invention.

[0032] Explanation of icon numbers:

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

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

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort 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 positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0037] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0038] Millimeter waves refer to electromagnetic waves with wavelengths between 1 and 10 millimeters, corresponding to a frequency range of approximately 30 GHz to 300 GHz. This frequency band possesses a series of unique properties, making it highly suitable for radar systems. With technological advancements, millimeter-wave radar is becoming increasingly economical, smaller, and easier to integrate into existing systems, playing a crucial role in automotive safety systems. The design and implementation of millimeter-wave radar systems require precise feed structures to ensure effective signal transmission and reception, a vital prerequisite for achieving high-performance radar systems.

[0039] Most mainstream 77GHz millimeter-wave radars currently use planar printed antennas made of high-frequency dielectric substrates, which are not only expensive but also have significant dielectric loss. Furthermore, because the dielectric constant of the dielectric substrate fluctuates depending on the manufacturing process, the antenna experiences substantial loss during power transmission, leading to a decrease in the efficiency of the millimeter-wave radar.

[0040] To solve the above problems, please refer to... Figures 1 to 9 This invention proposes a power supply structure 100, including a connecting section 1, a switching section 2, and a grounding copper column bar 3. The connecting section 1 and the switching section 2 are connected sequentially along the length of the connecting section 1. Both the connecting section 1 and the switching section 2 include a first metal layer 11, a substrate 12, and a second metal layer 13 arranged sequentially along the height of the connecting section 1. The first metal layer 11 includes a first connecting portion 111, a microstrip line 112, and a second connecting portion 113 arranged sequentially at intervals along the width of the connecting section 1. The grounding copper column bar 3 includes a first copper column bar 31 and a second copper column bar 32 respectively disposed on both sides of the microstrip line 112. The two ends of the first copper column bar 31 along the axial direction are respectively The first connecting part 111 and the second metal layer 13 are connected. The two ends of the second copper column 32 along the axial direction are respectively connected to the second connecting part 113 and the second metal layer 13. The connecting section 1 includes a first end away from the conversion section 2 and a second end for connecting the conversion section 2. The first end is used for power supply connection. The distance between the first copper column 31 and the second copper column 32 in the first end is smaller than the distance between the first copper column 31 and the second copper column 32 in the second end. The width of the microstrip line 112 changes correspondingly to the distance between the first copper column 31 and the second copper column 32. 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 present invention proposes a feeding structure 100 for a millimeter-wave radar antenna 1000. This structure includes a connecting section 1 and a transition section 2, which are sequentially connected along the length of the feeding structure 100. Both the connecting section 1 and the transition section 2 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. A grounding waveguide structure is formed by the first metal layer 11, the substrate 12, the second metal layer 13, and the grounded copper pillars 3, facilitating impedance matching. Furthermore, the first copper pillars 31 and the second copper pillars 32 on both sides of the microstrip line 112 block electromagnetic signals, reducing electromagnetic leakage during antenna signal transmission. The gradually increasing width of the microstrip line 112 away from the connecting section 1 helps to form a signal radiation mode, enabling the signal to be output more effectively from the feeding structure 100, reducing antenna loss during transmission, and improving antenna efficiency.

[0042] In an optional embodiment, for ease of impedance matching of connection segment 1, please refer to... Figures 1 to 3 The connecting segment 1, along the direction close to the conversion segment 2, includes a first segment 1a, a second segment 1b, and a third segment 1c connected sequentially. The projections of the microstrip lines 112 of the first segment 1a and the third segment 1c onto the substrate 12 are both rectangular structures. The width of the microstrip lines 112 gradually increases along the direction close to the third segment 1c. In this scheme, the first segment 1a in the connecting segment 1 is used for connection to the chip. The connection problem can be effectively solved by forming a grounded coplanar waveguide through the connecting segment 1. By adjusting the height of the substrate 12, the width of the microstrip lines 112, and the gap widths between the microstrip lines 112 and the first connecting portion 111 and the second connecting portion 113, respectively, an impedance matching value of 50 ohms can be obtained, thereby minimizing signal loss during transmission. Since the corresponding connection structures on the chip are mostly of fixed dimensions, the size of the first segment 1a generally corresponds to the size of the connection structures on the chip. In other words, the first segment 1a has a fixed size, while the third segment 1c is used to connect to the corresponding transition segment 2. Setting the first segment 1a and the third segment 1c as a rectangular structure allows for a buffer distance between the signal entering the first segment 1a and leaving the third segment 1c, thus achieving smooth transmission. In addition, to facilitate the transition of the signal from the connection segment 1 to the transition segment 2, a second segment 1b is additionally set between the first segment 1a and the third segment 1c to realize the signal transmission transition.

[0043] In this embodiment, the cross-sectional shape of the second segment 1b is an flared structure with straight boundaries. From the first segment 1a towards the third segment 1c, the width of the microstrip line 112 gradually increases, and correspondingly, the spacing between the first copper pillar row 31 and the second copper pillar row 32 also increases. The spacing between the first copper pillar row 31 and the second copper pillar row 32 changes accordingly with the width of the microstrip line 112. This ensures stable signal transmission while simultaneously blocking the signal through the first and second copper pillar rows 31 and 32, thereby reducing signal leakage during transmission. This reduces antenna signal loss during transmission and improves signal transmission efficiency.

[0044] In other embodiments, the width of the microstrip line 112 in the second segment 1b, and the spacing between the first copper pillar 31 and the second copper pillar 32, can also be flared structures with other boundary shapes, such as concave or convex arc structures, which can also achieve signal transition during transmission. Structures with straight boundaries are simpler than other shapes and are easier to form during manufacturing, making it easier to control product quality during mass production. Therefore, a transition structure with straight boundaries is adopted in this embodiment. In summary, the width of the microstrip line 112 gradually increases along the direction closer to the third segment 1c. This not only helps to achieve a gradual signal transition and reduce potential signal distortion, but also helps to match the impedance of different parts, reduce signal reflection during transmission, and improve signal transmission efficiency. This makes the feed structure 100 more adaptable to the signal transmission requirements of different frequencies and power levels, thereby improving the overall performance of the millimeter-wave radar antenna 1000.

[0045] Furthermore, in order to improve the signal blocking effect of the first copper column 31 and the second copper column 32, thereby minimizing signal loss during transmission, please refer to... Figures 1 to 3 The diameter of the grounding copper post is d, and the center-to-center distance between two adjacent grounding copper posts along the length of connection segment 1 is p, where 2 ≤ p / d ≤ 4. This proportional range is set based on electromagnetic principles and signal shielding considerations. By precisely controlling the size and spacing of the grounding copper posts, interference during signal transmission can be effectively reduced, improving signal integrity and stability. 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, to facilitate the fabrication of the feed structure 100, it is fabricated using LDS-MID technology. The principle of LDS-MID technology is to use a plastic material containing special additives to form the desired component through injection molding. Then, a laser beam is used to irradiate specific areas of these plastic components, activating the additives. In the subsequent metallization process, metallic elements such as copper are deposited on the laser-processed surface, forming conductive patterns. This creates a high-precision three-dimensional circuit on the plastic surface. LDS (Laser Direct Molding) technology allows for the direct formation of metallic patterns on three-dimensional plastic components, while MID technology directly integrates electronic circuitry into the plastic components. This combination of technologies enables high-precision, high-density circuit structures while maintaining a lightweight and miniaturized structure. This fabrication method not only improves the performance and reliability of the feed structure 100 but also helps reduce production costs and increase production efficiency. This advanced fabrication technology allows for more complex and refined circuit designs, thus meeting the requirements of the millimeter-wave radar antenna 1000 for a high-performance feed structure 100.

[0047] In an optional embodiment, to reduce antenna signal loss at the switching section 2, metal layers are provided on both sides of the switching section 2 along its length. The presence of the metal layers can enhance the electromagnetic compatibility of the structure, reduce signal interference during transmission, and improve signal stability and reliability. Simultaneously, the metal layers can also serve as heat dissipation paths, helping to disperse and conduct heat generated during signal transmission, thereby protecting sensitive electronic components from overheating. By providing metal layers on both sides of the switching section 2 instead of the first copper column 31 and the second copper column 32, signal shielding can be achieved, reducing signal loss during transmission. Furthermore, it facilitates the integration of multiple feed structures 100. When connecting multiple feed structures 100 together, only metal layers on both sides of the edge are needed to achieve signal shielding, simplifying the integrated design of millimeter-wave radar. Moreover, it is simpler and more convenient to manufacture than the grounded copper column 3, facilitating production operations.

[0048] This 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. The two ends of the dielectric waveguide port 4 along its length are respectively connected to a conversion section 2 and the horn antenna 5. The specific structure of the feeding structure 100 is as described in the above embodiments. Since this millimeter-wave radar antenna 1000 adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated further here. The combined use of the feeding structure 100 with the dielectric waveguide port 4 and the horn antenna 5 helps to achieve high directivity, high gain, and low sidelobe characteristics of the millimeter-wave radar antenna 1000, which is crucial for improving the target detection capability and anti-interference capability of the radar system. By precisely controlling the transmission and radiation of signals, this antenna design can improve the radar system's ability to identify and track targets, thereby improving vehicle safety and the performance of driver assistance systems.

[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. Under normal circumstances, to ensure that the propagation direction of the electromagnetic wave is directly forward (parallel to the ground), the shape of the horn antenna 5 is an outwardly spreading horn shape, such as... Figure 4 As shown, this would prevent the horn antenna 5 from being fixed in place, and its waveguide port would be in a floating state, unable to connect to the chip. Therefore, in this solution, the structure of the horn antenna 5 is optimized, as follows: Figure 5 As shown, by cutting off the lower half of the horn antenna 5 to make it flush with the bottom surface of the feed structure 100, the millimeter-wave radar can be attached to the radar board to complete the connection with the chip, thereby effectively controlling the radiation direction and beamwidth of the signal and improving the performance of the radar system.

[0050] To further optimize the electromagnetic wave transmission path, the horn antenna 5 includes a right-angle section 51 and an arc-shaped section 52. The right-angle section 51 is connected to the dielectric waveguide port 4, and the arc-shaped section 52 is connected to the end of the right-angle section 51 away from the dielectric waveguide port 4. The side of the arc-shaped section 52 facing away from the right-angle section 51 has an arc-shaped structure. Please refer to... Figure 5 and Figure 6 When the lower half of the horn antenna 5 is removed, the electromagnetic wave propagation distances along paths a and b are different, resulting in different exit times for the electromagnetic wave. This causes the electromagnetic wave propagation direction to no longer be parallel to the ground, but rather propagate slightly upwards. To optimize the electromagnetic wave propagation direction and achieve better signal transmission, please refer to... Figure 1 and Figure 7By setting an arc segment 52 at the tail of the horn antenna 5, the arc segment 52 slows down the propagation speed of path b, making the time required for paths a and b to propagate into the air similar, thereby achieving the effect of correcting the direction of electromagnetic wave propagation. Figure 6 and Figure 7 The images show simulated electromagnetic wave propagation paths before and after the addition of the curved section 52. Figure 6 It can be seen that, without the addition of the curved section 52, at the tail of the horn antenna 5, the electromagnetic wave above lags significantly behind the electromagnetic wave below, resulting in... Figure 6 The electromagnetic wave propagates diagonally upwards because its propagation path in direction a is longer than that in direction b. Please refer to [the documentation / reference] after adding the curved section 52 to the tail of the horn antenna 5. Figure 7 By slowing down the propagation speed of electromagnetic waves in the b-direction through the arc segment 52, it can be seen that the upper and lower parts of the same electromagnetic wave beam maintain a near-synchronous transmission effect, causing the electromagnetic waves to propagate primarily in the horizontal direction. This optimizes the transmission path of the electromagnetic waves, giving the horn antenna 5 better directivity. Optionally, in this 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, depending on actual needs. Optimizing the structure of the horn antenna 5 reduces phase errors during signal transmission, improving signal transmission quality. Optimizing the signal transmission path helps improve the radar system's ability to identify and track targets, thereby improving vehicle safety and the performance of driver assistance systems. Please refer to... Figure 8 and Figure 9 , Figure 8 This diagram illustrates the reflection coefficient of a horn antenna 5 with an arc segment 52 in one embodiment of this scheme. The impedance matching of the horn antenna 5 is 50 ohms. As can be seen from the diagram, the reflection coefficient is less than -18dB in the range of 76GHz to 81GHz. Figure 9 The diagram shows a simulated structure of the directivity coefficient of the horn antenna 5. As can be seen from the diagram, the directivity coefficient reaches 11.67 dBi at the center frequency, and the actual gain of the antenna reaches 8.33 dBi, indicating good directivity and gain.

[0051] In an optional embodiment, 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 constitute an antenna unit. The millimeter-wave radar antenna 1000 includes multiple antenna units, and each feed structure 100 is an integrated structure. This design facilitates the modularization and integration of the millimeter-wave radar antenna 1000, simplifies the production and assembly process, and improves production efficiency. Simultaneously, the integrated structure helps reduce the complexity of connections between components, improving the stability and reliability of the overall structure. This modular design also makes it easier to maintain and replace antenna units, thereby reducing maintenance costs and improving system reliability.

[0052] This invention also proposes a vehicle including a millimeter-wave radar antenna 1000. Integrating the millimeter-wave radar antenna 1000 into the vehicle provides key sensors required for advanced driver assistance systems, such as adaptive cruise control, collision warning, and blind spot detection. By integrating the high-performance millimeter-wave radar antenna 1000 into the vehicle, the vehicle's safety and intelligence levels can be improved, providing the driver with a more comfortable and safer driving experience. This integrated design not only improves the vehicle's performance but also helps enhance passenger comfort and satisfaction. The specific structure of the millimeter-wave radar antenna 1000 is as described in the above embodiments. Since this vehicle adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated further here.

[0053] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A millimeter-wave radar antenna, characterized in that, The system includes a power supply structure, which includes a connection section, a conversion section, and a grounding copper column. The connection section and the conversion section are connected sequentially along the length of the connection section. Both the connection section and the conversion section include a first metal layer, a substrate, and a second metal layer arranged sequentially along the height of the connection section. The first metal layer includes a first connecting portion, a microstrip line, and a second connecting portion arranged at intervals along the width of the connection section. The grounding copper column includes a first copper column and a second copper column respectively disposed on both sides of the microstrip line. The first copper column is connected to the first connecting part and the second metal layer at both ends along the axial direction, and the second copper column is connected to the second connecting part and the second metal layer at both ends along the axial direction. The connecting segment includes a first end away from the conversion segment and a second end for connecting to the conversion segment. The first end is used for power supply connection. The spacing between the first copper column and the second copper column in the first end is smaller than the spacing between the first copper column and the second copper column in the second end. The width of the microstrip line varies correspondingly to the spacing between the first and second copper column. The width of the microstrip line on the conversion segment gradually increases in the direction away from the connecting segment; dielectric waveguide port; as well as The horn antenna has a dielectric waveguide port with the two ends of the conversion section connected to the horn antenna along its length. The horn antenna includes a right-angle section and an arc section. The right-angle section is connected to the dielectric waveguide port, and the arc section is connected to the end of the right-angle section away from the dielectric waveguide port. The side of the arc section facing away from the right-angle section has an arc structure.

2. The millimeter-wave radar antenna as described in claim 1, characterized in that, The connecting segment includes a first segment, a second segment, and a third segment connected in sequence along the direction close to the transition segment. The projections of the microstrip lines of the first segment and the third segment onto the substrate are both rectangular structures. Along the direction close to the third segment, the width of the microstrip line gradually increases.

3. The millimeter-wave radar antenna as described in claim 2, characterized in that, The diameter of the grounding copper post is d, and the center distance between two adjacent grounding copper posts along the length of the connecting section is p, where 2≤p / d≤4.

4. The millimeter-wave radar antenna as described in claim 1, characterized in that, The power supply structure is fabricated using LDS-MID technology.

5. The millimeter-wave radar antenna as described in claim 1, characterized in that, The transition section has metal layers on both sides along its length.

6. The millimeter-wave radar antenna as described in claim 1, 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 the direction away from the dielectric waveguide port.

7. The millimeter-wave radar antenna as described in claim 1, characterized in that, A feeding structure, a dielectric waveguide port, and a horn antenna constitute an antenna unit. A millimeter-wave radar antenna includes multiple antenna units, and each feeding structure is an integrated structure.

8. A car, characterized in that, Includes a millimeter-wave radar antenna as described in any one of claims 1 to 7.

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