Radar antenna and radar

Abstract

The invention relates to the technical field of antennas, and discloses a radar antenna and a radar, and the radar antenna comprises an antenna carrier, an antenna unit and a copper-clad plate. The antenna carrier is provided with an antenna cavity; the antenna unit is arranged in the antenna cavity; the copper-clad plate comprises a fitting part and a radiation blind hole group, the radiation blind hole group is formed on one surface, facing the antenna carrier, of the copper-clad plate, the radiation blind hole group is arranged opposite to the antenna unit, and the fitting part surrounds the periphery of the radiation blind hole group. And the antenna carrier is tightly attached to the attaching part so as to seal the antenna unit in the antenna cavity. According to the radar antenna, an antenna cover does not need to be additionally configured, so that the research and development period is shortened, and the overall manufacturing cost is also reduced.

Description

Technical Field

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

[0002] In recent years, the application of millimeter-wave radar antennas has become increasingly widespread and in-depth in industries such as automotive, IoT, drones, security, and sports. This has led to increasing and increasingly demanding requirements for radar functionality and performance. The antenna is the only component that enables radar to communicate over the air interface, and its design significantly impacts the overall performance of the millimeter-wave radar.

[0003] In recent years, plastic metallized air waveguide antennas have been widely used in automotive radar, communications equipment, and other fields due to their lightweight, low cost, and excellent high-frequency performance. However, existing technologies have the following drawbacks: the radiating aperture of traditional waveguide antennas directly connects to the chip connector, requiring an additional radome to prevent the intrusion of contaminants such as dust and moisture. The radome must strictly match the electromagnetic characteristics of the antenna, requiring repeated adjustments in material selection and dimensional design, significantly extending the R&D cycle. Furthermore, the independent radome requires separate mold creation and production, increasing raw material costs and assembly steps, thereby increasing overall manufacturing costs. Summary of the Invention

[0004] In order to address the deficiencies of the prior art, the present invention provides a radar antenna and a radar, which, since no additional radome is required, shortens the R&D cycle and reduces the overall manufacturing cost.

[0005] The technical effects to be achieved by the present invention are achieved through the following aspects: In a first aspect, the present invention provides a radar antenna, comprising: An antenna carrier, wherein the antenna carrier is provided with an antenna cavity; an antenna unit, disposed in the antenna cavity; and A copper clad laminate, comprising a bonding portion and a radiation blind hole group, wherein the radiation blind hole group is formed on a surface of the copper clad laminate facing the antenna carrier, and the radiation blind hole group is arranged directly opposite the antenna unit, and the bonding portion is arranged around the periphery of the radiation blind hole group; The antenna carrier is tightly fitted to the fitting portion to seal the antenna unit in the antenna cavity.

[0006] In some implementations, there are multiple antenna units and multiple antenna cavities, and one antenna unit is disposed in each antenna cavity.

[0007] In some implementations, the antenna carrier further includes a feeding structure and a transmission line, and the antenna unit is electrically connected to the feeding structure via the transmission line.

[0008] In this implementation, the feed structure divides the input signal equally among the antenna elements, ensuring uniform energy distribution and thus guaranteeing the reliability of the radar antenna.

[0009] In some implementations, the bonding portion is configured as a pad structure.

[0010] In this implementation, the bonding portion can be tightly bonded to the antenna carrier by welding, thereby ensuring a stable connection between the antenna carrier and the copper clad laminate. Preferably, the copper clad laminate is bonded to the antenna carrier by soldering.

[0011] In some implementations, the bonding portion is formed on an entire surface of the copper clad laminate facing the antenna carrier; or The bonding portion is formed on a periphery of a side of the copper-clad laminate facing the antenna carrier.

[0012] In some implementations, the antenna unit is a waveguide slot antenna, the radiation blind hole group includes a plurality of radiation blind holes, and the plurality of radiation blind holes are respectively arranged in a one-to-one correspondence with the slots of the plurality of antenna units.

[0013] In this implementation, the electromagnetic waves radiated by multiple antenna units are coherently superimposed in space to improve the gain. A group of radiation blind holes is directly opposite to one antenna unit. The electromagnetic waves radiated by the antenna unit pass through multiple radiation blind holes. The narrow beam improves the long-distance communication capability, thereby enhancing the performance of the radar antenna.

[0014] In some implementations, the thickness of the copper clad board is any value between one twentieth and one twenty-fifth of the radiation wavelength of the antenna unit.

[0015] In a second aspect, the present invention provides a radar, comprising: The housing comprises a receiving cavity having an opening; a signal processing module, disposed in the accommodating cavity; and The radar antenna is connected to the signal processing module for power feeding and covers the opening of the accommodating cavity so that the accommodating cavity forms a sealed cavity.

[0016] In some implementations, the signal processing module includes a PCB board and at least one functional circuit arranged on the PCB board, and the at least one functional circuit is connected to the radar antenna feed.

[0017] In this implementation, the radar transmits microwave signals through the radar antenna. When the microwave signals encounter the target object, part of the signal will be reflected back. These reflected signals are received by the radar antenna and transmitted back to the radar through the feeding structure for processing. The radar processes the received reflected signals and extracts information such as the distance, speed and direction of the target object.

[0018] In some implementations, the signal processing module is connected to a surface of the antenna carrier facing away from the copper-clad laminate, and the antenna carrier covers an opening of the accommodating cavity.

[0019] In this implementation, the metal layer around the edge of the antenna carrier near the bottom shell is partially etched away to expose the plastic, which is then ultrasonically or laser welded to the bottom shell to achieve a seamless connection, thereby ensuring waterproof and dustproof performance. It should be noted that the bottom shell is made of plastic.

[0020] In some implementations, the copper clad plate covers the opening of the accommodating cavity.

[0021] In some implementations, the radar further includes a seal, a first connection hole is provided on the periphery of the antenna carrier, a second connection hole is provided on the shell that cooperates with the first connection hole, the seal is provided between the antenna carrier and the shell, and screws are passed through both the first connection hole and the second connection hole.

[0022] In summary, the present invention has at least the following benefits: The radar antenna provided by the present invention has an antenna carrier with an antenna cavity, an antenna unit disposed within the cavity, and a copper-clad laminate including a bonding portion and a group of radiating blind holes. The radiating blind holes are positioned directly opposite the antenna unit. The bonding portion tightly fits the antenna carrier to enclose the antenna unit within the cavity, allowing electromagnetic waves from the antenna unit to pass through the group of radiating blind holes. While achieving wave transmission, the copper-clad laminate also protects the antenna unit from intrusion of contaminants such as dust and water vapor. This eliminates the need for a separate radome, shortening the development cycle and reducing overall manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the structure of the radar antenna of Example 1; Figure 2 for Figure 1 Another perspective structural diagram of the radar antenna shown; Figure 3 Schematic diagram of the structure of the radar antenna of Example 2; Figure 4 Schematic diagram of the structure of the laminating portion of Example 2; Figure 5Schematic diagram of the structure of the copper clad plate and antenna carrier of Example 2; Figure 6 Schematic diagram comparing the S11 parameter performance of the radar antenna of Example 2 with that of the antenna in the prior art; Figure 7 Schematic diagram comparing the 77 GHz radiation direction of the radar antenna of Example 2 with that of the antenna in the prior art; Figure 8 This is an exploded view of the radar of Example 3; Figure 9 This is a schematic structural diagram of the radar of Example 3.

[0024] Markings in the figure: 10. Radar antenna; 100, antenna carrier; 101, antenna cavity; 110, feeding structure; 120, transmission line; 200, antenna unit; 300, copper clad laminate; 310, bonding portion; 320, radiating blind via group; 321, radiating blind via; 20. Radar; 400, housing; 401, opening; 402, accommodating cavity; 500, signal processing module; 510, PCB board. DETAILED DESCRIPTION

[0025] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0027] Example 1: Please see the attached Figure 1 ~Attached Figure 2 The radar antenna 10 of the present invention includes an antenna carrier 100, an antenna unit 200 and a copper clad plate 300.

[0028] Please combine Figure 1 and Figure 2 , Figure 1 and Figure 2The diagram illustrates the structural relationship between the antenna carrier 100, antenna unit 200, and copper-clad laminate 300 in an embodiment of the present invention. Specifically, the antenna carrier 100 defines an antenna cavity 101; the antenna unit 200 is disposed within the antenna cavity 101; and the copper-clad laminate 300 includes a bonding portion 310 and a group of radiating blind vias 320. The group of radiating blind vias 320 is formed on the side of the copper-clad laminate 300 facing the antenna carrier 100, and is positioned directly opposite the antenna unit 200. The bonding portion 310 surrounds the group of radiating blind vias 320. The antenna carrier 100 and the bonding portion 310 are tightly bonded to each other, enclosing the antenna unit 200 within the antenna cavity 101.

[0029] In this embodiment, the radar antenna 10 includes an antenna carrier 100, an antenna unit 200 and a copper clad laminate 300. The antenna unit 200 is correspondingly installed in an antenna cavity 101 opened on the antenna carrier 100. The copper clad laminate 300 is tightly connected to the antenna carrier 100, thereby enclosing the antenna unit 200 in the antenna cavity 101.

[0030] Specifically, the copper clad laminate 300 includes a bonding portion 310 and a radiation blind hole group 320, and the radiation blind hole group 320 is arranged opposite to the antenna unit 200, that is, the radiation blind hole group 320 is arranged corresponding to the antenna unit 200, and the bonding portion 310 is arranged around the periphery of the radiation blind hole group 320. The bonding portion 310 is tightly fitted with the antenna carrier 100, so that the copper clad laminate 300 is tightly fitted and connected to the antenna carrier 100, thereby enclosing the antenna unit 200 in the antenna cavity 101 to prevent the intrusion of pollutants such as dust and water vapor.

[0031] It can be understood that due to the close fit between the copper-clad laminate 300 and the antenna carrier 100, the copper-clad laminate 300 encloses the antenna unit 200 within the antenna cavity 101, thus providing protection for the antenna unit 200. At the same time, due to the etching of the radiation blind hole group 320 on the copper-clad laminate 300, electromagnetic waves can pass through the radiation blind hole group 320, thereby ensuring the efficient transmission capability of the radar antenna 10. In this way, the radar antenna 10 does not need to be equipped with a separate radome, and can provide protection for the antenna unit 200 while also meeting the radar antenna 10's wave transmission requirements.

[0032] It should be noted that the copper-clad board 300 is made of wave-transparent material, such as metallized plastic, and copper is clad on the surface of the plastic board and a radiation blind hole group 320 is etched. The antenna carrier 100 has an antenna cavity 101 on one side which is tightly connected to the copper-clad side of the plastic board.

[0033] In the radar antenna 10 described above, the antenna carrier 100 defines an antenna cavity 101, and the antenna unit 200 is disposed within the antenna cavity 101. The copper-clad laminate 300 includes a bonding portion 310 and a group of radiating blind holes 320. The radiating blind holes 320 are positioned directly opposite the antenna unit 200. The bonding portion 310 is tightly bonded to the antenna carrier 100 to enclose the antenna unit 200 within the antenna cavity 101. Electromagnetic waves from the antenna unit 200 can pass through the group of radiating blind holes 320. While achieving a wave-transmitting function, the copper-clad laminate 300 also protects the antenna unit 200 from the intrusion of contaminants such as dust and water vapor. This shortens the R&D cycle and reduces overall manufacturing costs, as no separate radome is required.

[0034] In some preferred embodiments, there are multiple antenna units 200 and antenna cavities 101, with one antenna unit 200 installed in each antenna cavity 101. That is, each antenna unit 200 is installed in one antenna cavity 101, and multiple antenna units 200 are installed in multiple antenna cavities 101 in a one-to-one correspondence. By installing antenna units 200 in multiple locations, signal coverage can be ensured over a wider area, reducing signal blind spots. Furthermore, multiple antenna units 200 can provide diversity reception, i.e., receiving signals from multiple paths, which helps reduce signal fading and interference, thereby improving signal stability and reliability.

[0035] Example 2: The difference between this embodiment and embodiment 1 is that this embodiment further optimizes the structure of the radar antenna 10 of the present invention. Figure 1 ~Attached Figure 2 .

[0036] Please combine Figure 1 and Figure 2 , Figure 1 and Figure 2 The schematic diagram shows the structural relationship among the antenna unit 200, the feeding structure 110 and the transmission line 120 in the embodiment of the present invention. Specifically, the antenna carrier 100 further includes the feeding structure 110 and the transmission line 120, and the antenna unit 200 is electrically connected to the feeding structure 110 via the transmission line 120.

[0037] In this embodiment, the antenna unit 200 is used to radiate or receive electromagnetic waves and is responsible for converting electromagnetic waves into electrical signals. The transmission line 120 is a conductor connecting the antenna unit 200 and the feed structure 110, used for signal transmission. The feed structure 110 achieves impedance matching and power distribution between the signal source and the antenna unit 200. Specifically, the feed structure 110 evenly distributes the input signal to each antenna unit 200, ensuring uniform energy distribution and thus ensuring the reliability of the radar antenna 10.

[0038] In some preferred embodiments, the bonding portion 310 is configured as a solder pad structure. This allows the bonding portion 310 to be tightly bonded to the antenna carrier 100 by welding, thereby ensuring a secure connection between the antenna carrier 100 and the copper-clad laminate 300. Preferably, the copper-clad laminate 300 is bonded to the antenna carrier 100 by soldering. Specifically, solder paste is applied to the bonding portion 310 of the copper-clad laminate 300 to achieve a connection between the copper-clad laminate 300 and the antenna carrier 100.

[0039] In some preferred embodiments, the bonding portion 310 is formed on the entire surface of the copper clad laminate 300 facing the antenna carrier 100; or the bonding portion 310 is formed on the periphery of the surface of the copper clad laminate 300 facing the antenna carrier 100. Figure 1 As shown, when the bonding portion 310 is formed on the entire surface of the copper clad laminate 300 facing the antenna carrier 100, that is, the entire surface of the copper clad laminate 300 facing the antenna carrier 100 is the bonding portion 310, the connection between the copper clad laminate 300 and the antenna carrier 100 is more stable. During welding, first ensure that the surfaces of the antenna carrier 100 and the bonding portion 310 are clean and oil-free, then apply solder paste to the corresponding areas of the antenna carrier 100 and the bonding portion 310, so that the antenna carrier 100 and the bonding portion 310 are connected by soldering. This welding method allows the copper clad laminate 300 to completely enclose the antenna unit 200 in the antenna cavity 101 without the need for a separate radome. While achieving dust and water resistance, it effectively avoids signal interference caused by the radome and also reduces the manufacturing cost of the radar antenna.

[0040] like Figure 3 As shown, when the bonding portion 310 is formed on the periphery of the copper-clad laminate 300 facing the antenna carrier 100, the antenna unit 200 is enclosed within the antenna cavity 101 while reducing material costs. For example, simply applying solder paste to the periphery of the copper-clad laminate 300 facing the antenna carrier 100 can provide a secure connection between the copper-clad laminate 300 and the antenna carrier 100. Specifically, solder paste is coated on the periphery of one side of the copper clad laminate 300 having the radiation blind hole group 320, and an external device is used to align the copper clad laminate 300 and the antenna carrier 100, that is, the periphery of the antenna carrier 100 is aligned with the periphery of the copper clad laminate 300, so that the copper clad laminate 300 and the antenna carrier 100 can be stably connected by soldering. In this way, the antenna unit 200 is sealed in the antenna cavity 101 by the copper clad laminate 300, avoiding the problem of dust and water vapor entering the antenna cavity 101 through the gap between the copper clad laminate 300 and the antenna carrier 100, thereby damaging the antenna unit 200.

[0041] In other embodiments, Figure 4As shown, the bonding portion 310 can also be formed around the outer periphery of the radiation blind hole group 320, so that the outer periphery of each radiation blind hole group 320 is tightly bonded to the antenna carrier 100, so that the multiple antenna cavities 101 are not connected to each other, thereby enhancing the sealing of each antenna cavity 101. In this way, even if the radar antenna 10 is affected by external factors and a gap is partially generated between the copper clad plate 300 and the antenna carrier 100, only the antenna unit 200 in one antenna cavity 101 is affected, and the remaining antenna units 200 continue to operate normally. At the same time, this structure effectively reduces the amount of solder used and avoids the problem of interference with the radiated signal.

[0042] In some preferred embodiments, please continue to see Figure 4 , Figure 4 This figure illustrates the specific structure of multiple radiation blind holes 320 in an embodiment of the present invention. Specifically, the antenna unit 200 is a waveguide slot antenna. The radiation blind hole 320 group includes multiple radiation blind holes 321, each corresponding to the slots of the multiple antenna units 200. The electromagnetic waves radiated by the multiple antenna units 200 are spatially coherently superimposed to increase gain. A group of radiation blind hole groups 320 corresponds directly to one antenna unit 200. The electromagnetic waves radiated by the antenna unit 200 pass through the multiple radiation blind holes 321, creating a narrow beam that improves long-range communication capabilities and, in turn, enhances the performance of the radar antenna 10. It should be noted that the number of radiation blind holes 321 in each radiation blind hole group 320 corresponds to the number of slots in the antenna unit 200. That is, the number of radiation blind holes 321 in each radiation blind hole group 320 is determined by the number of slots in each antenna unit 200. In this embodiment, there are six radiation blind holes 321, which form a radiation blind hole group 320. Among them, the position of the radiating blind hole corresponds to the slot in the slot antenna, thereby adjusting the radiation pattern of the antenna, enhancing the gain in a specific direction or suppressing the side lobe, and the radiating blind hole group forms an array corresponding to the slot antenna and can also form an electromagnetic shield, reducing the impact of surrounding circuits or metal structures on antenna performance, and improving long-distance communication capabilities.

[0043] In some more preferred embodiments, the thickness of the copper-clad laminate 300 ranges from one-twentieth to one-twenty-fifth of the wavelength of radiation from the antenna unit 200. This allows the current or voltage to form standing waves on the conductor, with current antinodes appearing on the feed structure 110 for maximum radiation and voltage nodes at the end for minimum impedance, thereby enhancing the performance of the radar antenna 10. Preferably, the thickness of the copper-clad laminate 300 is one-twenty-fifth of the wavelength of radiation from the antenna unit 200.

[0044] Although the antenna structure of the embodiment of the present invention removes the structure of the radome, the antenna performance of the antenna structure of the embodiment of the present invention can still be guaranteed. In fact, due to the elimination of the interference of the radome, its performance is better than the existing technology in some aspects. The embodiment of the present invention is used for performance verification of the single-channel antenna structure. Please refer to Figure 5-Figure 7 .

[0045] The single-channel antenna structure formed by the technical means of the embodiment of the present invention is as follows Figure 5 As shown, it includes an antenna carrier 100 and a copper-clad laminate 300. The side of the copper-clad laminate 300, on which a group of radiation blind holes 320 are etched, fits tightly against the side of the antenna carrier 100 with the antenna cavity 101, thereby sealing the antenna unit 200 within the antenna cavity 101. A conventional waveguide antenna (not shown) comprises an antenna carrier, a PCB with radiation holes, and a radome. The PCB is connected to the antenna carrier, and the radome covers the PCB and antenna carrier, thereby preventing dust and moisture from entering the antenna cavity through the radiation holes. In other words, the structural difference between the two is that the present invention uses an integrated antenna structure, while the conventional antenna uses a conventional radome. The remaining structures are the same.

[0046] The antennas of the above two structures were tested respectively, and the following results were obtained: Figure 6 and Figure 7 Schematic diagram of antenna performance.

[0047] in, Figure 6 The S11 parameter performance diagram for the two antenna structures is shown. It specifically reflects the reflection coefficient at the antenna input port. The lower the value, the better the antenna matching and the less energy reflection.

[0048] The analysis focuses on the frequency range of 75 to 80 GHz: Low frequency band (75 to 76.5 GHz): The two antennas have similar S11 values ​​and matching characteristics, but the integrated antenna of the embodiment of the present invention is slightly better.

[0049] Mid-frequency band (76.5 to 79 GHz): The integrated antenna of this invention achieves lower S11 values ​​than conventional radome solutions, resulting in better signal matching. In particular, around 78.5 GHz, the integrated antenna's S11 value reaches a minimum of -16.5, approaching ideal matching. Conventional radome solutions achieve optimal matching between 77.5 and 79 GHz, with a minimum S11 value approaching -17.

[0050] High frequency band (79 to 80 GHz): The S11 values ​​of both antennas rebound, and the matching becomes worse, but the rebound of the integrated antenna is smaller, and the matching is still relatively good.

[0051] Therefore, it can be seen that in the frequency range of 75 to 80 GHz, the integrated antenna of the embodiment of the present invention exhibits better matching characteristics, especially around 78.5 GHz.

[0052] Also, see Figure 7 , Figure 7 The comparison between the 77 GHz radiation direction and the existing radome technology solution is shown.

[0053] In terms of gain comparison, the vertical axis in the figure shows how gain changes with angle. The integrated antenna of the embodiment of the present invention has a significantly higher gain in the 0° main radiation direction than the prior art, approximately 1.5-2dB higher. This means that the present invention has stronger signal transmission and reception capabilities in specific directions. At an off-axis angle of ±30°, the integrated antenna of the embodiment of the present invention still maintains a gain of more than -3dB, while the gain of the antenna of the prior art decreases more rapidly, indicating that the integrated antenna also has a stronger signal retention capability in the side lobe direction.

[0054] In terms of directivity, the integrated antenna of the present invention has a sharper main lobe beam, with an angle of approximately ±8°. The existing radome solution has a wider main lobe beam, with an angle of approximately ±12°. This demonstrates that the integrated antenna of the present invention has stronger directivity, more concentrated energy in a specific direction, and is more suitable for communication scenarios requiring precise pointing.

[0055] In terms of beamwidth comparison, the integrated antenna of the present invention has a beamwidth of approximately 16° at -3dB, while the waveguide antenna + radome has a beamwidth of approximately 24°. The narrower beamwidth means the integrated antenna of the present invention has higher spatial resolution, making it suitable for radar or communication systems that require precise target positioning.

[0056] In summary, the integrated antenna of the present invention has higher directivity, higher gain, and a narrower beam than existing technologies. Not only does it offer superior performance, but its structure also achieves wave-transmission while the copper-clad laminate protects the antenna unit from dust, moisture, and other contaminants. This eliminates the need for a separate radome, shortening the development cycle and reducing overall manufacturing costs.

[0057] Example 3: This embodiment provides a radar 20 based on the above embodiment. Figure 8 ~Attached Figure 9 .

[0058] A radar 20 includes a housing 400 , a signal processing module 500 , and the radar antenna 10 described above.

[0059] Among them, see Figure 8 , Figure 8The schematic diagram illustrates the structural relationship between the housing 400, signal processing module 500, and radar antenna 10 in an embodiment of the present invention. Specifically, the housing 400 includes a housing chamber 402 with an opening 401; the signal processing module 500 is disposed within the housing chamber 402; and the radar antenna 10 is connected to the signal processing module 500 for power supply and covers the opening 401 of the housing chamber 402, forming a sealed cavity.

[0060] In this embodiment, the signal processing module 500 is used to analyze and forward signals received by the antenna unit 200, ensuring the reliability of the radar 20. The signal processing module 500 is connected to the radar antenna 10 for power supply and is disposed within the accommodating cavity 402. The radar antenna 10 covers the opening 401 of the accommodating cavity 402. The radar antenna 10 forms a sealed cavity within the accommodating cavity 402, thereby protecting the antenna carrier 100 and the signal processing module 500 and preventing contaminants such as dust and moisture from entering the accommodating cavity 402 and causing malfunctions of the radar 20.

[0061] In some preferred embodiments, the signal processing module 500 includes a PCB board 510 and at least one functional circuit disposed on the PCB board 510. The at least one functional circuit is electrically connected to the radar antenna 10. This electrically connected signal processing module 500 and the radar antenna 10 enable the radar 20 to transmit and receive electromagnetic wave signals. Specifically, the radar 20 transmits microwave signals via the radar antenna 10. When the microwave signals encounter a target object, portions of the signals are reflected. These reflected signals are received by the radar antenna 10 and transmitted back to the radar 20 via the feed structure 110 for processing. The radar 20 then processes the received reflected signals to extract information such as the target object's distance, speed, and direction.

[0062] In some preferred embodiments, see Figure 9 , Figure 9 The schematic diagram shows the structural relationship between the antenna carrier 100 and the housing 400 in an embodiment of the present invention. Specifically, the signal processing module 500 is connected to the side of the antenna carrier 100 facing away from the copper-clad board 300, and the antenna carrier 100 covers the opening 401 of the accommodating cavity 402. That is, the PCB board 510 is connected to the antenna carrier 100, thereby improving the compactness of the structure. The metal layer on the peripheral edge of the side of the antenna carrier 100 close to the bottom shell is partially etched away to expose the plastic, and then ultrasonic welding or laser welding is performed between the antenna carrier 100 and the bottom shell to achieve a seamless connection, thereby ensuring waterproof and dustproof performance. It should be noted that the bottom shell is made of plastic.

[0063] In some preferred embodiments, the copper-clad laminate 300 covers the opening 401 of the accommodating cavity 402. By etching away a portion of the metal layer around the periphery of the side of the copper-clad laminate 300 that connects to the antenna carrier 100 to expose the plastic, the copper-clad laminate 300 is then ultrasonically or laser welded to the bottom shell to achieve a seamless connection, thereby ensuring waterproof and dustproof performance. It will be understood that when the copper-clad laminate 300 is used to cover the opening 401 of the accommodating cavity 402, the radial length of the antenna carrier 100 will be smaller than the radial length of the copper-clad laminate 300, so that the copper-clad laminate 300 can completely cover the opening 401 of the accommodating cavity 402.

[0064] In some preferred embodiments, the radar 20 further includes a seal. A first connection hole is defined on the periphery of the antenna carrier 100, and a second connection hole is defined on the housing 400 that mates with the first connection hole. The seal is positioned between the antenna carrier 100 and the housing 400, with screws inserted through both the first and second connection holes. This creates a sealed connection between the antenna carrier 100 and the bottom housing, ensuring the radar 20's waterproof and dustproof properties and enhancing overall structural reliability.

[0065] In the radar 20 of the present invention, the antenna carrier 100 defines an antenna cavity 101, and the antenna unit 200 is disposed within the antenna cavity 101. The copper-clad laminate 300 includes a bonding portion 310 and a group of radiating blind holes 320. The radiating blind holes 320 are disposed directly opposite the antenna unit 200. The bonding portion 310 is tightly bonded to the antenna carrier 100 to enclose the antenna unit 200 within the antenna cavity 101. Electromagnetic waves from the antenna unit 200 can pass through the group of radiating blind holes 320. While achieving a wave-transmitting function, the copper-clad laminate 300 also protects the antenna unit 200 from intrusion of contaminants such as dust and water vapor. This shortens the R&D cycle and reduces overall manufacturing costs because no separate radome is required.

[0066] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0067] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0068] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0069] In the present invention, unless otherwise expressly specified or limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0070] Although the present invention has been described with reference to the above specific embodiments, it will be apparent to those skilled in the art that many substitutions, modifications, and variations can be made based on the above. Therefore, all such substitutions, modifications, and variations are intended to be encompassed within the spirit and scope of the appended claims.

Claims

1. A radar antenna, characterized in that: include: An antenna carrier (100), wherein the antenna carrier (100) is provided with an antenna cavity (101); An antenna unit (200) is arranged in the antenna cavity (101); and A copper-clad plate (300) comprising a bonding portion (310) and a radiation blind hole group (320), wherein the radiation blind hole group (320) is formed on a surface of the copper-clad plate (300) facing the antenna carrier (100), and the radiation blind hole group (320) is arranged opposite to the antenna unit (200), and the bonding portion (310) is arranged around the periphery of the radiation blind hole group (320); The antenna carrier (100) is tightly fitted to the fitting portion (310) to enclose the antenna unit (200) in the antenna cavity (101).

2. The radar antenna according to claim 1, characterized in that There are multiple antenna units (200) and multiple antenna cavities (101), and one antenna unit (200) is provided in each antenna cavity (101).

3. The radar antenna according to claim 1 or 2, characterized in that The antenna carrier (100) further comprises a feeding structure (110) and a transmission line (120), and the antenna unit (200) is electrically connected to the feeding structure (110) via the transmission line (120).

4. The radar antenna according to claim 1, wherein: The bonding portion (310) is configured as a pad structure.

5. The radar antenna according to claim 4, characterized in that The bonding portion (310) is formed on an entire surface of the copper-clad plate (300) facing the antenna carrier (100); or The bonding portion (310) is formed on the periphery of a side of the copper-clad plate (300) facing the antenna carrier (100).

6. The radar antenna according to claim 1, characterized in that The antenna unit (200) is a waveguide slot antenna, the radiation blind hole group (320) comprises a plurality of radiation blind holes (321), and the plurality of radiation blind holes (321) are respectively arranged in a one-to-one correspondence with the slots of the plurality of antenna units (200).

7. The radar antenna according to claim 1, wherein: The thickness of the copper-clad plate (300) is any value between one twentieth and one twenty-fifth of the radiation wavelength of the antenna unit (200).

8. A radar, characterized in that: include: The housing (400) includes a receiving cavity (402) having an opening (401); A signal processing module (500) is disposed in the accommodating cavity (402); and The radar antenna (10) according to any one of claims 1 to 7, wherein the radar antenna (10) is connected to the signal processing module (500) for feeding and covers the opening (401) of the accommodating cavity (402) so that the accommodating cavity (402) forms a sealed cavity.

9. The radar according to claim 8, characterized in that The signal processing module (500) comprises a PCB board (510) and at least one functional circuit arranged on the PCB board (510), wherein the at least one functional circuit is connected to the radar antenna (10) for feeding.

10. The radar according to claim 9, characterized in that The signal processing module (500) is connected to a surface of the antenna carrier (100) facing away from the copper-clad plate (300), and the antenna carrier (100) covers the opening (401) of the accommodating cavity (402).

11. The radar according to claim 9, characterized in that The copper-clad plate (300) covers the opening (401) of the accommodating cavity (402).

12. The radar according to claim 9, characterized in that The invention also includes a sealing member, wherein a first connection hole is provided on the periphery of the antenna carrier (100), and a second connection hole cooperating with the first connection hole is provided on the shell (400), and the sealing member is provided between the antenna carrier (100) and the shell (400), and screws are simultaneously provided through the first connection hole and the second connection hole.

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