Millimeter wave radar antenna

Abstract

The invention discloses a millimeter wave radar antenna, and relates to the technical field of antennae, the millimeter wave radar antenna comprises a waveguide member, two opposite side surfaces of the waveguide member along a first direction are respectively an opening surface and a mounting surface, the mounting surface is used for mounting a chip, and the opening surface is provided with a plurality of transmission holes penetrating through the mounting surface. The transmission hole comprises a radiation section, a transmission section and a chip connection section; the radiation section is arranged close to the opening surface and is used for transmitting or receiving an electromagnetic signal transmitted through the free space towards the free space; the transmission section is connected with the radiation section and used for transmitting electromagnetic signals, and the transmission section comprises a bending section deviating from the radiation section; and the chip connecting section is connected with the bending section, extends along the first direction, is arranged close to the mounting surface, is adjacent to the mounting position of the chip, and is used for sending an electromagnetic signal to the chip or receiving the electromagnetic signal sent by the chip. According to the technical scheme, flexible layout of the antenna can be achieved, and the space utilization rate is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of antennas, and particularly to a millimeter-wave radar antenna. Background Art

[0002] The antenna forms used in automotive millimeter-wave radar antennas include PCB antennas, and the PCB antennas include forms such as microstrip patch antennas and microstrip comb antennas. However, under substrates of 30 - 300 GHz, the antenna gain is small, the antenna efficiency is low, and the feeder loss is large.

[0003] Using waveguide antennas can improve the antenna efficiency and reduce the feeder loss. Common waveguide antennas include waveguide horn antennas, waveguide slot antennas, etc. However, since automotive millimeter-wave radar antennas are usually MIMO arrays, it is required that the antenna has a small independent volume, a compact structure, and flexible feeder routing. While the volume of waveguide antennas is usually large and the layout is not flexible.

[0004] Therefore, how to achieve flexible layout of the antenna has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] The main object of the present invention is to propose a millimeter-wave radar antenna, aiming to achieve flexible layout of the antenna.

[0006] To achieve the above object, the millimeter-wave radar antenna proposed by the present invention includes a waveguide member. The two opposite side surfaces of the waveguide member along the first direction are respectively an opening surface and a mounting surface. The mounting surface is used for mounting a chip. The opening surface is provided with a plurality of transmission holes penetrating the mounting surface. The transmission holes include a radiation section, a transmission section, and a chip connection section. The radiation section is arranged close to the opening surface and is used for emitting or receiving electromagnetic signals transmitted through free space towards free space. The transmission section is connected to the radiation section and is used for transmitting electromagnetic signals. The transmission section includes a bending section facing away from the radiation section. The bending section includes at least one first bending unit bent along the second direction, and / or the bending section includes at least one second bending unit bent along the third direction. The chip connection section is connected to the bending section, extends along the first direction, is arranged close to the mounting surface, and is adjacent to the mounting position of the chip, and is used for emitting electromagnetic signals towards the chip or receiving electromagnetic signals emitted by the chip.

[0007] In an embodiment, the transmission section further includes a transition section and at least one opening connection section. One end of the transition section is connected to the first bending unit and / or the second bending unit, and the cross-sectional area of the transition section is set to change along the transmission direction of the electromagnetic signal. One end of each opening connection section is communicated with the transition section, and the other end is communicated with the radiation section.

[0008] In one embodiment, the transition section includes a first matching section and a second matching section; the first matching section is connected to the first bending unit and / or the second bending unit, and along the direction from the chip connection section to the radiation section, the cross-sectional area of the first matching section is set to gradually decrease; both ends of the second matching section are respectively communicated with the first matching section and the opening connection section, the second matching section includes a main section and at least one branch section, the main section is connected to the first matching section, and the cross-sectional area of the main section is larger than the maximum cross-sectional area of the first matching section, and the branch section is correspondingly connected to the opening connection section.

[0009] In one embodiment, a protrusion is provided on the inner side wall of the second matching section, the height of the protrusion is a, the wavelength of the electromagnetic signal is λ, and a ≤ λ / 2.

[0010] In one embodiment, the waveguide further includes at least one partition, and at least one partition is arranged on the side wall of each radiation section to divide the radiation section into a plurality of radiation cavities arranged along a third direction to enhance the concentration of electromagnetic signals.

[0011] In one embodiment, the waveguide includes a first waveguide plate and a second waveguide plate; one side surface of the first waveguide plate along the first direction forms an opening surface, the other side surface along the first direction is a first connection surface, a radiation groove is opened on the opening surface, and a first transmission groove communicated with the radiation groove is opened on the first connection surface; one side surface of the second waveguide plate along the first direction forms an installation surface, the other side surface along the first direction is a second connection surface, a second transmission groove is opened on the second connection surface, and a transceiver groove is opened at the bottom of the second transmission groove. The second waveguide plate is stacked with the first waveguide plate, and the second connection surface is attached to the first connection surface so that the first transmission groove is communicated with the second transmission groove; wherein, the radiation groove forms the radiation section of the transmission hole, the first transmission groove and the second transmission groove jointly form the transmission section of the transmission hole, and the transceiver groove forms the chip connection section of the transmission hole.

[0012] In one embodiment, the waveguide further includes a conductive convex part, and the conductive convex part is arranged at the installation position of the chip to reduce the leakage of electromagnetic signals between the chip and the chip connection section.

[0013] In one embodiment, along the direction close to the transmission section, the cross-sectional dimensions of the chip connection section are set to gradually change.

[0014] In one embodiment, auxiliary grooves are respectively opened on both sides of each radiation section of the waveguide along the second direction, and the auxiliary grooves extend along the third direction.

[0015] In one embodiment, the wavelength of the electromagnetic signal is λ, wherein the dimension of the auxiliary groove along the third direction is l, l = λ / 4; and / or, the dimension of the auxiliary groove along the first direction is h, 1mm ≤ h ≤ 1.5mm; and / or, the distance between the center lines of the two auxiliary grooves of each radiation section along the second direction is d, d = 1.5λ.

[0016] In the technical solution of the present invention, the transmission path of the electromagnetic signal starts from the free chip connection section, passes through the transmission section and then reaches the radiation section. The first bending unit and the second bending unit of the radiation section make the path of the transmission section tortuous, flexibly controlling the length of the transmission path of the electromagnetic signal within the limited space of the millimeter-wave radar antenna, effectively improving the signal transmission efficiency, reducing the path loss, ensuring the stable performance of the antenna. Moreover, the radiation sections of multiple transmission holes are integrated at the installation position adjacent to the chip, making full use of the limited space of the millimeter-wave radar antenna to integrate the transmission holes, enhancing the space utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0018] Figure 1 It is a schematic structural diagram of an embodiment of a millimeter-wave radar antenna provided by the present invention;

[0019] Figure 2 It is Figure 1 a schematic diagram of the back of the millimeter-wave radar antenna in

[0020] Figure 3 It is Figure 1 a schematic diagram of a partial structure of the millimeter-wave radar antenna in

[0021] Figure 4 It is Figure 3 a schematic diagram of the transmission hole in

[0022] Figure 5 It is Figure 4 a schematic diagram of the transition section structure in

[0023] Figure 6 It is Figure 1 a schematic diagram of all the transmission holes of the millimeter-wave radar antenna in

[0024] Figure 7 It is a schematic diagram of a partial structure of another embodiment of the millimeter-wave radar antenna provided by the present invention;

[0025] Figure 8 It is Figure 7 a schematic diagram of the transition section of the transmission hole in

[0026] Figure 9 It is Figure 8 a top view structural diagram of the transition section in

[0027] Figure 10 For Figure 1 the radiation pattern of a millimeter-wave radar antenna in the millimeter and sub-millimeter wave bands.

[0028] Explanation of the reference numerals in the attached drawings:

[0029] 100. Millimeter-wave radar antenna; 1. Waveguide component; 1A. Opening surface; 1B. Mounting surface; 11. First waveguide plate; 12. Second waveguide plate; 13. Protrusion; 14. Partition; 15. Conductive protrusion; 2. Transmission hole; 21. Radiation section; 211. Radiation cavity; 22. Transmission section; 221. Bent section; 222. Transition section; 2221. First matching section; 2222. Second matching section; 2222A. Main body section; 2222B. Branch section; 223. Opening connection section; 23. Chip connection section; 3. Auxiliary groove.

[0030] The realization, functional features and advantages of the objectives of the present invention will be further described with reference to the embodiments and the attached drawings. Specific embodiments

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the attached drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0033] In addition, if there are descriptions such as "first" and "second" involved in the embodiments of the present invention, the descriptions of "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0034] When the PCB board antenna is under a substrate of 30 - 300 GHz, the antenna gain is small, the antenna efficiency is low, the feeder loss is large, and the volume of the waveguide antenna is usually large, making the layout inflexible.

[0035] Based on this, the present invention proposes a millimeter - wave radar antenna 100.

[0036] Please refer to Figure 1 With Figure 4 , in an embodiment of the present invention, the millimeter - wave radar antenna 100 includes a waveguide member 1. The two opposite side surfaces of the waveguide member 1 along the first direction are respectively an opening surface 1A and a mounting surface 1B. The mounting surface 1B is used for mounting a chip. The opening surface 1A is provided with a plurality of through - holes 2 that penetrate the mounting surface 1B. The through - holes 2 include a radiation section 21, a transmission section 22, and a chip connection section 23. The radiation section 21 is disposed close to the opening surface 1A and is used for emitting or receiving electromagnetic signals transmitted through free space towards free space. The transmission section 22 is connected to the radiation section 21 and is used for transmitting electromagnetic signals. The transmission section 22 includes a bent section 221 facing away from the radiation section 21. The bent section 221 includes at least one first bending unit bent along the second direction, and / or the bent section 221 includes at least one second bending unit bent along the third direction. The chip connection section 23 is connected to the bent section 221, extends along the first direction, is disposed close to the mounting position of the chip, and is used for emitting electromagnetic signals towards the chip or receiving electromagnetic signals emitted by the chip.

[0037] In the technical solution of the present invention, the transmission path of the electromagnetic signal starts from the chip connection section 23, reaches the radiation section 21 after passing through the transmission section 22. The first bending unit and the second bending unit of the radiation section 21 make the path of the transmission section 22 tortuous, flexibly controlling the length of the transmission path of the electromagnetic signal within the limited space of the millimeter - wave radar antenna 100, effectively improving the signal transmission efficiency, reducing the path loss, ensuring the stable performance of the antenna. Moreover, the radiation sections 21 of the plurality of through - holes 2 are integrated at the mounting position adjacent to the chip, making full use of the limited space of the millimeter - wave radar antenna 100 to integrate the through - holes 2, enhancing the space utilization rate.

[0038] It should be noted that among the plurality of through - holes 2, some of the through - holes 2 are used as receiving antennas, and the rest of the through - holes 2 are used as transmitting antennas. Through reasonable layout and design, an optimized configuration of the receiving and transmitting functions can be achieved, improving the overall performance of the antenna. In some embodiments, the waveguide member 1 is provided with eight through - holes 2, four of which are used for receiving signals and four are used for transmitting signals. The eight through - holes 2 are distributed in a MIMO array.

[0039] Moreover, the lengths of the plurality of through - holes 2 are controlled by the bending design of the transmission section 22 so that the phases of the electromagnetic signals emitted by each through - hole 2 are consistent.

[0040] Wherein, the second direction and the third direction are two mutually perpendicular directions perpendicular to the first direction, and the transmission section 22 is bent at least along one of the second direction or the third direction.

[0041] Please refer to Figure 6 , in an embodiment, the transmission section 22 includes a first bending unit bent along the second direction and a second bending unit bent along the third direction, in an "L" shape or approximately an "L" shape; in another embodiment, the transmission section 22 includes a plurality of first bending units bent along the second direction and a plurality of second bending units bent along the third direction, in an "S" shape or approximately an "S" shape, in a "U" shape or approximately a "U" shape.

[0042] In an embodiment of the present invention, the transmission section 22 further includes a transition section 222 and at least one open connection section 223; one end of the transition section 222 is connected to the first bending unit and / or the second bending unit, and along the transmission direction of the electromagnetic signal, the cross-sectional area of the transition section 222 is set to change; one end of each open connection section 223 is communicated with the transition section 222, and the other end is communicated with the radiation section 21. Thus, the bandwidth matching of the millimeter-wave radar antenna 100 is achieved.

[0043] Please refer to in combination Figure 5 , in an embodiment of the present invention, the transition section 222 includes a first matching section 2221 and a second matching section 2222; the first matching section 2221 is connected to the first bending unit and / or the second bending unit, and along the direction from the chip connection section 23 to the radiation section 21, the cross-sectional area of the first matching section 2221 is set to gradually decrease; both ends of the second matching section 2222 are respectively communicated with the first matching section 2221 and the open connection section 223, and the second matching section 2222 includes a main body section 2222A and at least one branch section 2222B, the main body section 2222A is connected to the first matching section 2221, and the cross-sectional area of the main body section 2222A is larger than the maximum cross-sectional area of the first matching section 2221, and the branch section 2222B is correspondingly connected to the open connection section 223. Thus, through step-by-step matching optimization, the stability and efficiency during the signal transmission process are ensured. Specifically, the cross-sectional area of each branch section 2222B is smaller than that of the main body section 2222A, forming a gradient change, so that the electromagnetic signal can smoothly transition during transmission, reducing reflection and loss, thereby improving the performance of the antenna.

[0044] In an embodiment of the present invention, a protrusion 13 is provided on the inner sidewall of the second matching section 2222. The height of the protrusion 13 is a, and the wavelength of the electromagnetic signal is λ, where a ≤ λ / 2. In this way, the protrusion 13 plays a role in improving the propagation characteristics of the electromagnetic signal. By providing the protrusion 13 on the inner sidewall, the scattering of the electromagnetic signal during transmission can be increased, thereby enhancing the uniformity of the signal in different directions. And since the height of the protrusion 13 is controlled below half of the wavelength, it ensures that the electromagnetic signal will not cause serious interference effects when passing through the protrusion 13, but is guided and dispersed in a relatively smooth manner.

[0045] It should be noted that the number of the protrusions 13 is related to the number of the branch sections 2222B. A plurality of protrusions 13 are respectively arranged at the interval positions between the connections of every two adjacent branch sections 2222B and the main body section 2222A.

[0046] Please refer to Figures 7 to 9 , in an embodiment of the present invention, the waveguide member 1 further includes at least one partition member 14. The at least one partition member 14 is arranged on the sidewall of each radiation section 21 to divide the radiation section 21 into a plurality of radiation cavities 211 arranged along the third direction, so as to enhance the concentration of the electromagnetic signal. In this way, the arrangement of the plurality of radiation cavities 211 enables the electromagnetic signal to be better directionally propagated in space, improving the radiation efficiency and directivity of the antenna.

[0047] Among them, in one implementation manner, the partition member 14 is formed by the solid structure when the transmission hole 2 is opened; in another implementation manner, the partition member 14 is in close fit with the sidewall of the radiation section 21 through an embedded design.

[0048] It should be noted that there is no fixed corresponding relationship between the number of the radiation cavities 211 and the number of the protrusions 13, and it can be flexibly adjusted according to specific design and performance requirements. In some implementation manners, the number of the radiation cavities 211 is relatively large to cover a wider propagation angle. In other implementation manners, the reduction of the number of the radiation cavities 211 helps to enhance the transmission intensity of the signal in a specific direction.

[0049] Moreover, the number of the protrusions 13 provided on the inner sidewall of the second matching section 2222, the number of the branch sections 2222B, and the number of the opening connection sections 223 are matched with the number of the radiation cavities 211 to achieve the best signal distribution and propagation effect. The propagation path of the electromagnetic signal in each transmission hole 2 is the chip connection section 23 - the bending section 221 - the first matching section 2221 - the main body section 2222A of the second matching section 2222 - a plurality of branch sections 2222B - a plurality of opening connection sections 223 - a plurality of radiation cavities 211. Among them, the plurality of branch sections 2222B and the plurality of opening connection sections 223 are correspondingly arranged, and each opening connection section 223 is connected to at least one radiation cavity 211.

[0050] In an embodiment of the present invention, the waveguide member 1 includes a first waveguide plate 11 and a second waveguide plate 12; one side surface of the first waveguide plate 11 in the first direction forms an opening surface 1A, and the other side surface in the first direction is a first connection surface. A radiation slot is formed on the opening surface 1A, and a first transmission slot communicating with the radiation slot is formed on the first connection surface; one side surface of the second waveguide plate 12 in the first direction forms an installation surface 1B, and the other side surface in the first direction is a second connection surface. A second transmission slot is formed on the second connection surface, and a transceiver slot is formed at the bottom of the second transmission slot. The second waveguide plate 12 is stacked on the first waveguide plate 11, and the second connection surface is attached to the first connection surface so that the first transmission slot communicates with the second transmission slot; wherein, the radiation slot forms a radiation section 21 of the transmission hole 2, the first transmission slot and the second transmission slot together form a transmission section 22 of the transmission hole 2, and the transceiver slot forms a chip connection section 23 of the transmission hole 2. Thus, the first waveguide plate 11 and the second waveguide plate 12 can be independently processed and assembled into a complete waveguide member 1, greatly reducing the production cost and simplifying the assembly process.

[0051] Please refer to Figure 2 , in an embodiment of the present invention, the waveguide member 1 further includes a conductive convex portion 15. The conductive convex portion 15 is disposed at the installation position of the chip to reduce the leakage of electromagnetic signals between the chip and the chip connection section 23. Thus, the conductive convex portion 15 provides additional protection for the transmission of electromagnetic signals, helps reduce the loss of electromagnetic signals, and improves the stability and reliability of electromagnetic signals.

[0052] In one embodiment, the conductive convex portion 15 includes a plurality of metal columns disposed on the installation surface 1B, and the metal columns are fixed on the installation surface 1B by welding or crimping. The arrangement of the metal columns can also provide structural support to ensure that the chip remains stable in the high-frequency working state and prevent small displacements caused by vibration or temperature changes.

[0053] In an embodiment of the present invention, along the direction close to the transmission section 22, the cross-sectional dimensions of the chip connection section 23 are set to gradually change. Thus, a progressive impedance matching is formed, thereby reducing reflection and loss.

[0054] Please refer to Figure 3 , in an embodiment of the present invention, auxiliary slots 3 are respectively formed on both sides of each radiation section 21 of the waveguide member 1 in the second direction, and the auxiliary slots 3 extend in the third direction. Thus, by providing the auxiliary slots 3, the radiation pattern of the radiation section 21 is adjusted to form a wide-beam radiation pattern as shown in Figure 10 , which can optimize the radiation characteristics and enable the waveguide member 1 to maintain a good radiation effect at different angles.

[0055] In an embodiment of the present invention, the wavelength of the electromagnetic signal is λ, where the dimension of the auxiliary slot 3 in the third direction is l, and l = λ / 4. By setting the length of the radiation slot to one-fourth of the wavelength λ in this way, further impedance matching can be achieved, reducing the reflection of electromagnetic waves in the waveguide member 1 and ensuring that the signal can be transmitted more efficiently.

[0056] In an embodiment of the present invention, the dimension of the auxiliary slot 3 in the first direction is h, and 1 mm ≤ h ≤ 1.5 mm. By adjusting the depth of the radiation slot in this way, the radiation range and direction of the electromagnetic waves can be effectively controlled, improving the overall performance of the waveguide member 1.

[0057] In an embodiment of the present invention, the distance between the centerlines of the two auxiliary slots 3 of each radiation segment 21 in the second direction is d, and d = 1.5λ. In this way, the radiation pattern of the waveguide member 1 can be further optimized, enhancing the consistency of the beam width, and thus providing a more uniform radiation effect in different application environments.

[0058] The above description is only an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A millimeter wave radar antenna, characterized in that: The invention comprises a waveguide component, wherein two opposite sides of the waveguide component along a first direction are respectively an opening surface and a mounting surface, wherein the mounting surface is used to mount a chip, and the opening surface is provided with a plurality of transmission holes penetrating the mounting surface, wherein the transmission holes include: A radiation section, disposed close to the opening surface, for emitting toward the free space or receiving electromagnetic signals transmitted through the free space; a transmission section connected to the radiation section for transmitting electromagnetic signals, the transmission section comprising a bending section away from the radiation section, the bending section comprising at least one first bending unit bent along a second direction, and / or the bending section comprising at least one second bending unit bent along a third direction; and The chip connection section is connected to the bending section, extends along the first direction, is arranged close to the mounting surface, and is adjacent to the mounting position of the chip, for sending an electromagnetic signal to the chip or receiving an electromagnetic signal sent by the chip.

2. The millimeter wave radar antenna according to claim 1, characterized in that: The transmission segment also includes: A transition section, one end of which is connected to the first bending unit and / or the second bending unit, and a cross-sectional area of ​​the transition section is changed along the transmission direction of the electromagnetic signal; and At least one open connecting section, one end of each of the open connecting sections is connected to the transition section, and the other end is connected to the radiation section.

3. The millimeter wave radar antenna according to claim 2, characterized in that: The transition section includes: a first matching section connected to the first bending unit and / or the second bending unit, wherein the cross-sectional area of ​​the first matching section is gradually reduced along the direction from the chip connecting section to the radiation section; and The second matching segment has two ends respectively connected to the first matching segment and the open connecting segment, the second matching segment includes a main segment and at least one branch segment, the main segment is connected to the first matching segment, and the cross-sectional area of ​​the main segment is larger than the maximum cross-sectional area of ​​the first matching segment, and the branch segment is correspondingly connected to the open connecting segment.

4. The millimeter wave radar antenna according to claim 3, characterized in that: The inner side wall of the second matching section is provided with a protrusion, the height of the protrusion is a, the wavelength of the electromagnetic signal is λ, and a≤λ / 4.

5. The millimeter wave radar antenna according to claim 2, characterized in that: The waveguide also includes at least one partition, which is arranged on the side wall of each radiation slot to separate the radiation section into a plurality of radiation cavities arranged along a third direction, so as to enhance the concentration of the electromagnetic signal.

6. The millimeter wave radar antenna according to claim 1, characterized in that: The waveguide comprises: A first waveguide plate, wherein one side surface along the first direction forms the opening surface, the other side surface along the first direction is a first connecting surface, a radiation slot is formed on the opening surface, and a first transmission slot connected to the radiation slot is formed on the first connecting surface; and A second waveguide plate, wherein one side surface along the first direction forms the mounting surface, and the other side surface along the first direction is a second connection surface, a second transmission groove is provided on the second connection surface, and a transceiver groove is provided at the bottom of the second transmission groove, the second waveguide plate is stacked with the first waveguide plate, and the second connection surface is attached to the first connection surface, so that the first transmission groove is connected with the second transmission groove; The radiation slot forms a radiation section of the transmission hole, the first transmission slot and the second transmission slot together form a transmission section of the transmission hole, and the transceiver slot forms a chip connection section of the transmission hole.

7. The millimeter wave radar antenna according to claim 1, characterized in that: The waveguide component further includes a conductive protrusion, which is arranged at the mounting position of the chip to reduce the leakage of electromagnetic signals between the chip and the chip connecting section.

8. The millimeter wave radar antenna according to claim 1, characterized in that: Along the direction approaching the transmission section, the cross-sectional dimensions of the chip connection section are changed step by step.

9. The millimeter wave radar antenna according to claim 1, characterized in that: The waveguide component is provided with auxiliary grooves on both sides of each radiation section along the second direction, and the auxiliary grooves extend along the third direction.

10. The millimeter wave radar antenna according to claim 9, characterized in that: The wavelength of the electromagnetic signal is λ, where The dimension of the auxiliary groove along the third direction is l, l=λ / 4; and / or, The dimension of the auxiliary groove along the first direction is h, 1mm≤h≤1.5mm; and / or, The distance between the center lines of the two auxiliary slots of each radiation segment along the second direction is d, where d=1.5λ.

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