Single-layer surface metallization plastic molded waveguide transmission structure, antenna, waveguide antenna radar and automobile

Abstract

The utility model provides a waveguide transmission structure formed by single-layer surface metallization plastic and an antenna, comprising a waveguide transmission line and a PCB, the waveguide transmission line is fixedly connected with the PCB; the PCB comprises a dielectric material and surface clad copper covering the dielectric material, two columns of separating walls are arranged on the waveguide transmission line, the surface clad copper, the waveguide transmission line and the separating walls surround to form a signal transmission cavity, one side of the signal transmission cavity is an input port, and the other side of the signal transmission cavity is an output port. According to the utility model, the copper clad on the surface of the PCB is used as a composition surface of the waveguide transmission line, so that the waveguide transmission line only needs a single-layer structure to realize signal transmission, the structure is simple, and the cost advantage is great.

Description

Technical Field

[0001] The utility model relates to the technical field of waveguide transmission lines, and particularly to a waveguide transmission structure and an antenna formed by single-layer surface metallization of plastics. Background Art

[0002] With the rapid development of wireless communication technology, microwaves and millimeter waves have gradually come into people's view and play an important role in the communication field.

[0003] Currently, in the application of vehicle-mounted millimeter-wave radars, waveguide antennas have received increasing attention due to their advantages such as low loss and high isolation. However, due to the complex internal structure of waveguide antennas, especially in the 76-81 GHz frequency band for vehicles, high requirements are imposed on dimensional accuracy, thus resulting in high requirements for processing technology and high manufacturing costs. Therefore, a low-cost waveguide transmission structure is needed. Summary of the Utility Model

[0004] Aiming at the defects in the prior art, the purpose of the utility model is to provide a waveguide transmission structure and an antenna formed by single-layer surface metallization of plastics.

[0005] According to a waveguide transmission structure formed by single-layer surface metallization of plastics provided by the utility model, it includes: a waveguide transmission line and a PCB board, and the waveguide transmission line is fixedly connected to the PCB board;

[0006] The PCB board includes a dielectric material and a surface copper coating covering the dielectric material. Two rows of isolation walls are arranged on the waveguide transmission line. The surface copper coating, the waveguide transmission line, and the isolation walls enclose to form a signal transmission cavity. One side of the signal transmission cavity is an input port, and the other side is an output port.

[0007] Preferably, two rows of cylindrical magnetic conductors are arranged between the two rows of isolation walls on the waveguide transmission line.

[0008] Preferably, the diameter of the cylindrical magnetic conductor is 0.5 - 0.8 mm, the height is 0.8 - 1.4 mm, the longitudinal center spacing is 1.0 - 1.5 mm, and the transverse spacing is 3.2 - 3.6 mm.

[0009] Preferably, the magnetic conductors and the isolation walls are arranged in parallel.

[0010] Preferably, the width of the isolation wall is 0.5 - 0.8 mm, the height is 0.8 - 1.4 mm, and the center spacing from the same-side cylindrical magnetic conductor is 1.0 - 1.5 mm.

[0011] Preferably, the thickness of the surface copper coating is greater than or equal to 0.02 mm.

[0012] Preferably, a ridge is further provided on the waveguide transmission line, and the ridge is a protruding structure with a rectangular cross-section.

[0013] Preferably, the ridge is located at the lateral center of two columns of cylindrical magnetic conductors, with a height of 0.5 - 0.8 mm and a width of 0.5 - 0.8 mm.

[0014] Preferably, the diameter of the cylindrical magnetic conductor is 0.5 - 0.8 mm, the height is 0.8 - 1.4 mm, the longitudinal center spacing is 1.0 - 1.5 mm, and the lateral spacing is 2.8 - 3.2 mm.

[0015] A waveguide antenna radar provided by the present utility model includes the waveguide transmission structure formed by single-sided surface metallization of plastic.

[0016] A vehicle provided by the present utility model includes the waveguide antenna radar.

[0017] Compared with the prior art, the present utility model has the following beneficial effects:

[0018] 1. The present utility model uses single-sided metallized plastic as the base material, which is light in weight and low in cost.

[0019] 2. The optimized structural feature dimensions of the present utility model are suitable for the injection molding process, solving the problem of insufficient precision in the injection molding process.

[0020] 3. The present utility model utilizes the copper coating on the surface of the PCB board as a constituent surface of the waveguide transmission line, enabling signal transmission with only a single-layer structure for the waveguide transmission line, which has a simple structure and a great cost advantage. Description of the Drawings

[0021] By reading the following detailed description of the non-restrictive embodiments with reference to the accompanying drawings, other features, objects, and advantages of the present utility model will become more apparent:

[0022] Figure 1 It is a three-dimensional view of the transmission line in the present utility model;

[0023] Figure 2 It is a three-dimensional view of the ridge transmission line in the present utility model;

[0024] Figure 3 It is a cross-sectional view of the transmission line in the present utility model;

[0025] Figure 4 It is a cross-sectional view of the ridge transmission line in the present utility model.

[0026] Description of the Reference Numerals:

[0027] Waveguide transmission line 1 Output port P2

[0028] Cylindrical magnetic conductor 11, PCB board 2

[0029] Partition wall 12, Copper-clad surface 21

[0030] Ridge 13, Dielectric material 22

[0031] Input port P1 Specific implementation mode

[0032] The following combines specific embodiments to elaborate on the present utility model in detail. The following embodiments will help those skilled in the art to further understand the present utility model, but do not limit the present utility model in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several changes and improvements can still be made. These all belong to the protection scope of the present utility model.

[0033] The present utility model discloses a waveguide transmission structure formed by single-layer surface metallization of plastic, referring to Figures 1 - 4 As shown, it includes a waveguide transmission line 1 and a PCB board 2. The PCB board 2 is provided with a single-sided copper-clad surface 21 and a dielectric material 22. The copper-clad surface 21 covers the surface of the dielectric material 22. The copper-clad surface 21, the waveguide transmission line 1, and the partition wall on the waveguide transmission line 1 together form a signal transmission cavity.

[0034] Under the waveguide transmission line 1, there are two columns of cylindrical magnetic conductors 11 located inside, and two columns of partition walls 12 located outside. To meet the requirements of plastic injection molding process and ensure the transmission of signals in the 76 - 81 GHz frequency band, the diameter of the cylindrical magnetic conductor 11 is 0.5 - 0.8 mm, the height is 0.8 - 1.4 mm, the longitudinal center spacing is 1.0 - 1.5 mm, and the transverse spacing is 3.2 - 3.6 mm; the width of the partition wall 12 is 0.5 - 0.8 mm, the height is 0.8 - 1.4 mm, and the center spacing from the cylindrical magnetic conductor on the same side is 1.0 - 1.5 mm.

[0035] The PCB board 2 is at least composed of a dielectric material 22 and a copper-clad surface 21, and the thickness of the copper-clad surface 21 is generally greater than or equal to 0.02 mm.

[0036] The waveguide transmission line 1 is fixed to the PCB board 2 through a certain connection method. According to the actual situation, snap connection, bolt connection, adhesive connection, etc. can be used. This connection method ensures that a cavity is formed between the waveguide transmission line 1 and the copper-clad surface 21 between the cylindrical magnetic conductors 11. This cavity can be used for signal transmission. One end of this cavity is the input port P1, and the output port is P2.

[0037] In a specific implementation mode, such as Figure 2 and Figure 4As shown in the figure, in order to reduce the product volume and optimize the transmission performance, a ridge 13 can be introduced into the transmission line; the ridge 13 is arranged on the waveguide transmission line 1, at the lateral center of the cylindrical magnetic conductor 11, with a height of 0.5 - 0.8 mm and a width of 0.5 - 0.8 mm.

[0038] For the waveguide transmission line 11 with a ridge, the lateral spacing of the cylindrical magnetic conductor 11 can be reduced to 2.8 - 3.2 mm.

[0039] The assembly gap between the waveguide transmission line 1 and the PCB board 2 in the height direction can be between 0 - 0.4 mm and still maintain good transmission efficiency.

[0040] The present utility model also discloses a waveguide transmission antenna, which adopts the above-mentioned waveguide transmission structure with single-layer surface metallized plastic molding.

[0041] In a specific embodiment, the waveguide transmission line 1 is provided with a cylindrical magnetic conductor 11 located outside and two rows of isolation walls 12 located inside below it. The cylindrical magnetic conductor 11 can be one turn, two turns or multiple turns, and the isolation wall 12 can be one layer, two layers or multiple layers.

[0042] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application 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 thus should not be construed as a limitation of the present application.

[0043] The specific embodiments of the present utility model have been described above. It should be understood that the present utility model is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present utility model. Without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A waveguide transmission structure formed by single-layer surface metallization of plastic, characterized in that, Comprising: A waveguide transmission line (1) and a PCB board (2), the waveguide transmission line (1) being connected to the PCB board (2); The PCB board (2) includes a dielectric material (22) and a copper cladding (21) covering the dielectric material (22). Two rows of isolation walls (12) are provided on the waveguide transmission line (1). The copper cladding (21), the waveguide transmission line (1), and the isolation walls (12) enclose a signal transmission cavity. One side of the signal transmission cavity is an input port, and the other side is an output port.

2. The waveguide transmission structure formed by single-layer surface metallization of plastics according to claim 1, wherein, Two rows of cylindrical magnetic conductors (11) are provided between the two rows of isolation walls (12) on the waveguide transmission line (1).

3. The waveguide transmission structure with single-layer surface metallized plastic molding according to claim 2, characterized in that, The diameter of the cylindrical magnetic conductor (11) is 0.5 - 0.8 mm, the height is 0.8 - 1.4 mm, the longitudinal center spacing is 1.0 - 1.5 mm, and the transverse spacing is 3.2 - 3.6 mm.

4. The waveguide transmission structure with single-layer surface metallized plastic molding according to claim 2, characterized in that The cylindrical magnetic conductors (11) are arranged in parallel with the isolation walls (12).

5. The waveguide transmission structure with single-layer surface metallized plastic molding according to claim 4, characterized in that, The width of the isolation wall (12) is 0.5 - 0.8 mm, the height is 0.8 - 1.4 mm, and the center spacing from the cylindrical magnetic conductor (11) on the same side is 1.0 - 1.5 mm.

6. The waveguide transmission structure formed by single-layer surface metallization of plastic according to claim 1, characterized in that, The thickness of the copper cladding (21) is greater than or equal to 0.02 mm.

7. The waveguide transmission structure with single-layer surface metallized plastic molding according to claim 1, characterized in that A ridge (13) is further provided on the waveguide transmission line (1), and the ridge (13) is a protruding structure with a rectangular cross-section.

8. The waveguide transmission structure formed by single-layer surface metallization of plastic according to claim 7, characterized in that, The ridge (13) is located at the transverse center of the two rows of cylindrical magnetic conductors (11), with a height of 0.5 - 0.8 mm and a width of 0.5 - 0.8 mm; The diameter of the cylindrical magnetic conductor (11) is 0.5 - 0.8 mm, the height is 0.8 - 1.4 mm, the longitudinal center spacing is 1.0 - 1.5 mm, and the transverse spacing is 2.8 - 3.2 mm.

9. A waveguide antenna radar, characterized in that, Comprising the waveguide transmission structure formed by single-layer surface metalized plastic as described in any one of claims 1 to 8.

10. A vehicle, characterized in that, Including the waveguide antenna radar as described in claim 9.

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