4T4R multi-port automobile radar antenna integration module

Abstract

The invention relates to the technical field of automobile radar antennas, in particular to a 4T4R multi-port automobile radar antenna integration module which comprises an integration module unit, a feed network unit and a radiation antenna unit, the integration module unit comprises a PCB, a waveguide chip is arranged in the middle of the PCB, a waveguide chip input port is formed in the bottom of the waveguide chip, and a waveguide chip output port is formed in the middle of the PCB. A high-speed synchronous serial port is arranged on one side of the waveguide chip on the PCB; the feed network unit comprises a feed network layer plate, and a waveguide feed port corresponding to the waveguide chip input port in position is formed in the middle of the upper surface of the feed network layer plate; compared with the prior art, reasonable layering is adopted for the waveguide slot antenna, the antenna is directly in butt joint with the waveguide chip, an original microstrip-to-waveguide transmission line is omitted, loss in the transmission and switching process is greatly reduced, energy consumption is greatly reduced, and the overall radiation efficiency of the antenna is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile radar antennas, and in particular to a 4T4R multi-port automobile radar antenna integrated module. Background Art

[0002] Waveguide slot antennas can significantly improve radiation efficiency compared to microstrip antennas. At the same time, since the feeding network uses air waveguides, the transmission loss is also reduced simultaneously.

[0003] At present, the existing antenna microstrip patch form has problems with loss and radiation efficiency, resulting in a decrease in detection distance and detection accuracy. The waveguide slot antenna form improves the radiation port efficiency and reduces the transmission loss, and uses the amplitude and phase distribution of the compressed side lobe to reduce interference. For this reason, the present invention proposes a 4T4R multi-port automotive radar antenna integrated module. Summary of the invention

[0004] The object of the present invention is to provide a 4T4R multi-port automotive radar antenna integrated module to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a 4T4R multi-port automobile radar antenna integrated module, comprising an integrated module unit, a feed network unit and a radiation antenna unit, wherein the integrated module unit comprises a PCB board, a waveguide chip is provided at the middle position of the PCB board, and a waveguide chip input port is provided at the bottom of the waveguide chip, and a high-speed synchronous serial port is provided on one side of the waveguide chip on the PCB board; the feed network unit comprises a feed network layer board, and a waveguide feeding port corresponding to the position of the waveguide chip input port is provided at the middle position of the upper surface of the feed network layer board.

[0006] As a preferred technical solution of the present invention, a waveguide feeding network connected to a waveguide feeding port is provided at the bottom of the feed network layer plate, and the radiating antenna unit includes a radiating antenna board, and an upper surface of the radiating antenna board is provided with an air waveguide feeding network corresponding to the position of the waveguide feeding network.

[0007] As a preferred technical solution of the present invention, a transmitting antenna group and a receiving antenna group connected to an air waveguide feeding network are provided on the lower surface of the radiating antenna plate.

[0008] As a preferred technical solution of the present invention, the transmitting antenna group includes a first transmitting antenna, a second transmitting antenna, a third transmitting antenna, and a fourth transmitting antenna, and the first transmitting antenna, the second transmitting antenna, the third transmitting antenna, and the fourth transmitting antenna each include six transmitting radiation ports.

[0009] As a preferred technical solution of the present invention, the receiving antenna group includes a first receiving antenna, a second receiving antenna, a third receiving antenna, and a fourth receiving antenna, and the first receiving antenna, the second receiving antenna, the third receiving antenna, and the fourth receiving antenna each include six receiving radiation ports.

[0010] As a preferred technical solution of the present invention, a sealing welding groove is provided on the waveguide feeding network, and a sealing welding material is provided in the sealing welding groove.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] The 4T4R multi-port automotive radar antenna integrated module of the present invention adopts reasonable layering for the waveguide slot antenna, and the antenna is directly connected to the waveguide chip, which saves the original microstrip to waveguide transmission line, greatly reduces the loss in the transmission and switching process, greatly reduces energy consumption, and effectively improves the overall radiation efficiency of the antenna.

[0013] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0015] Figure 2 It is a schematic diagram of the top view of the integrated module unit of the present invention;

[0016] Figure 3 It is a bottom view structural schematic diagram of the integrated module unit of the present invention;

[0017] Figure 4 It is a schematic diagram of the top view of the structure of the feed network unit of the present invention;

[0018] Figure 5 It is a bottom view structural schematic diagram of the feeding network unit of the present invention;

[0019] Figure 6 It is a schematic diagram of the top view of the radiation antenna unit of the present invention;

[0020] Figure 7 It is a schematic diagram of the structure of the radiation antenna unit of the present invention when viewed from above;

[0021] Figure 8 A schematic diagram of a simulation direction proposed in an embodiment of the present invention;

[0022] Fig. 9 For the present invention Fig. 9 The left side enlarged schematic diagram;

[0023] Fig.10 For the present invention Fig. 9 The enlarged schematic diagram on the right side of

[0024] Fig.11 It is a schematic diagram of a standing wave test curve proposed in an embodiment of the present invention;

[0025] In the figure: 100, integrated module unit; 101, PCB board; 102, waveguide chip; 103, high-speed synchronous serial port; 104, waveguide chip input port; 200, feeding network unit; 201, feeding network layer board; 202, waveguide feeding port; 203, waveguide feeding network; 300, radiating antenna unit; 301, radiating antenna board; 302, air waveguide feeding network; 310, transmitting antenna group; 311, first transmitting antenna; 312, second transmitting antenna; 313, third transmitting antenna; 314, fourth transmitting antenna; 320, receiving antenna group; 321, first receiving antenna; 322, second receiving antenna; 323, third receiving antenna; 324, fourth receiving antenna. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] See also Figure 1-11In this embodiment, a 4T4R multi-port automotive radar antenna integrated module is provided, including an integrated module unit 100, a feed network unit 200 and a radiation antenna unit 300. The integrated module unit 100 includes a PCB board 101, a waveguide chip 102 is provided in the middle position of the PCB board 101, and a waveguide chip input port 104 is provided at the bottom of the waveguide chip 102, and a high-speed synchronous serial port 103 is provided on one side of the waveguide chip 102 on the PCB board 101; the feed network unit 200 includes a feed network layer board 201, and a waveguide feeding port 202 corresponding to the position of the waveguide chip input port 104 is provided in the middle position of the upper surface of the feed network layer board 201.

[0030] In this embodiment, a waveguide feeding network 203 connected to the waveguide feeding port 202 is provided at the bottom of the feed network layer plate 201, and the radiating antenna unit 300 includes a radiating antenna board 301, and an air waveguide feeding network 302 corresponding to the position of the waveguide feeding network 203 is provided on the upper surface of the radiating antenna board 301.

[0031] In this embodiment, a transmitting antenna group 310 and a receiving antenna group 320 connected to the air waveguide feeding network 302 are disposed on the lower surface of the radiating antenna board 301 .

[0032] In this embodiment, the transmitting antenna group 310 includes a first transmitting antenna 311, a second transmitting antenna 312, a third transmitting antenna 313, and a fourth transmitting antenna 314, and the first transmitting antenna 311, the second transmitting antenna 312, the third transmitting antenna 313, and the fourth transmitting antenna 314 each include six transmitting radiation ports.

[0033] In this embodiment, the receiving antenna group 320 includes a first receiving antenna 321, a second receiving antenna 322, a third receiving antenna 323, and a fourth receiving antenna 324. The first receiving antenna 321, the second receiving antenna 322, the third receiving antenna 323, and the fourth receiving antenna 324 each include six receiving radiation ports.

[0034] In this embodiment, a sealing welding groove is provided on the waveguide feeding network 203, and a sealing welding material is provided in the sealing welding groove.

[0035] The present invention adopts a design scheme of a plastic metallized waveguide structure. The antenna is divided into 4 transmitting antennas and 4 receiving antennas. Finally, it is connected to the radar radio frequency waveguide chip 102 and enters the single-chip microcomputer through the high-speed synchronous serial port 103 to perform subsequent work such as unit data verification. This scheme completes the antenna selection and design simulation, network design simulation, antenna material selection, structural mold processing, assembly and surface treatment and other process evaluations.

[0036] The specific implementation method is:

[0037] In order to meet the requirements of the near-field receiving and transmitting antenna gain and the 3dB beam width of the vertical section, a 2*0.6mm gap is used, that is, the size of the six receiving radiation ports and the six transmitting radiation ports are 2*0.6m, and the spacing between adjacent receiving radiation ports or transmitting radiation ports of the same receiving antenna or transmitting antenna (i.e. Figure 7 The lengths of L1, L2, L3, and L4 shown in the figure are also arranged in a periodic integer multiple of 2.93 mm. Each antenna uses 6 radiating units, and Taylor is used to make amplitude and phase distribution to achieve high gain and low side lobe requirements. The structural test and simulation results are shown in the figure. Figure 8-11 As shown in the simulation direction schematic diagram and the standing wave test curve schematic diagram, the waveguide feeding port adopts a multi-level anti-leakage design to ensure that there is no leakage between the waveguide port and the active interface.

[0038] The overall design of the module is divided into three layers. The upper integrated module unit 100 includes a waveguide chip 102 and a high-speed synchronous serial port 103. The lower antenna module includes a feed network unit 200 and a radiation antenna unit 300. The feed network unit 200 and the radiation antenna unit 300 are connected by a combination of screws and SMT solutions. The waveguide feeding port 202 is connected to the waveguide chip input port 104 of the waveguide chip of the integrated module and provided to the subsequent signal processing chip through the high-speed synchronous serial port 103.

[0039] The present invention also proposes a manufacturing method of a 4T4R multi-port automotive radar antenna integrated module, the steps of which are as follows: the feed network layer plate 201 and the radiation antenna plate 301 are injection molded into materials through high-precision molds and injection molding processes; the materials are subjected to a special plastic metallization process (PVD) to metallize their surface layers and have good surface roughness; a sealed welding groove design is adopted around the feed waveguide of the feed network layer plate 201; a steel mesh in the SMT process is used to fill solder paste and other materials in the sealed welding groove of the feed network layer plate 201; positioning holes and positioning columns are used to accurately position the upper and lower layers so that the feed network layer plate 201 and the radiation antenna plate 301 do not deviate; the product is fixed on a customized fixture and then reflowed and sealed; screws or sealants are used after the integrated module unit 100 and the antenna module are positioned, thereby ensuring that the waveguide feed port 202 is tightly connected to the waveguide chip input port 104;

[0040] In this embodiment, the waveguide slot antenna is reasonably layered, and the complex 3D model is manufactured in one step by injection molding, and then the plastic electroplating process is used to metalize the plastic surface and the roughness reaches within 1.0 equivalent to that of metal; after the plastic is metalized, the electrical performance of the antenna can be guaranteed to be consistent with that of metal, which greatly reduces the weight of the product, saves the machining cost, and improves the consistency of the product in the mass production process, which has become a major trend in automotive radar antennas. The antenna is directly connected to the waveguide chip, saving the original microstrip to waveguide transmission line, greatly reducing the loss in the transmission and switching process, greatly reducing energy consumption, and effectively improving the overall radiation efficiency of the antenna.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. 4T4R multi-port automotive radar antenna integrated module, characterized in that, The invention comprises an integrated module unit (100), a feed network unit (200) and a radiation antenna unit (300); the integrated module unit (100) comprises a PCB board (101); a waveguide chip (102) is provided at a middle position on the PCB board (101); a waveguide chip input port (104) is provided at the bottom of the waveguide chip (102); a high-speed synchronous serial port (103) is provided on one side of the waveguide chip (102) on the PCB board (101); and the feed network unit (200) comprises a feed network layer board (201); a waveguide feeding port (202) corresponding to the position of the waveguide chip input port (104) is provided at a middle position on the upper surface of the feed network layer board (201).

2. The 4T4R multi-port automotive radar antenna integrated module according to claim 1, characterized in that: A waveguide feeding network (203) connected to the waveguide feeding port (202) is provided at the bottom of the feed network layer plate (201); the radiation antenna unit (300) comprises a radiation antenna plate (301); and an air waveguide feeding network (302) corresponding to the position of the waveguide feeding network (203) is provided on the upper surface of the radiation antenna plate (301).

3. The 4T4R multi-port automotive radar antenna integrated module according to claim 2, characterized in that: The lower surface of the radiation antenna plate (301) is provided with a transmitting antenna group (310) and a receiving antenna group (320) which are connected to the air waveguide feeding network (302).

4. The 4T4R multi-port automotive radar antenna integrated module according to claim 3, characterized in that: The transmitting antenna group (310) includes a first transmitting antenna (311), a second transmitting antenna (312), a third transmitting antenna (313), and a fourth transmitting antenna (314), and the first transmitting antenna (311), the second transmitting antenna (312), the third transmitting antenna (313), and the fourth transmitting antenna (314) each include six transmitting radiation ports.

5. The 4T4R multi-port automotive radar antenna integrated module according to claim 3, characterized in that: The receiving antenna group (320) includes a first receiving antenna (321), a second receiving antenna (322), a third receiving antenna (323), and a fourth receiving antenna (324); the first receiving antenna (321), the second receiving antenna (322), the third receiving antenna (323), and the fourth receiving antenna (324) each include six receiving radiation ports.

6. The 4T4R multi-port automotive radar antenna integrated module according to claim 2, characterized in that: The waveguide feeding network (203) is provided with a sealing welding groove, and a sealing welding material is provided in the sealing welding groove.

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