Microstrip feed-in structure suitable for waveguide antenna and waveguide antenna

Abstract

The utility model provides a microstrip feed-in structure suitable for a waveguide antenna and the waveguide antenna, and the structure comprises a nail bed structure which is connected between the waveguide antenna and a PCB substrate; the microstrip lead-in gap and the nail bed structure are jointly arranged on the outer side of a waveguide opening of the waveguide antenna in a surrounding manner; the nail bed structure comprises a plurality of nail beds, and one end of each nail bed is connected to the outer side of the waveguide opening in the side edge direction of the waveguide opening. The micro-strip lead-in gap is positioned on the outer side of one short edge of the rectangle; the microstrip feeder line on the PCB substrate extends into the projection of the waveguide opening on the PCB substrate from the side where the microstrip lead-in gap is located.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of antenna, specifically, a microstrip feed structure suitable for waveguide antenna and waveguide antenna. BACKGROUND

[0002] The traditional microstrip-to-waveguide transmission structure design is mostly inserted into the microstrip feed line at the narrow edge or wide edge of the rectangular waveguide end along the direction of the side of the waveguide, and the microstrip feed line is fed with signals of appropriate frequency to excite the electrical signals that can be transmitted along the waveguide transmission line, thereby playing the role of switching and transmission. Figure 1 A typical microstrip-to-waveguide structure design is provided. In this typical microstrip-to-waveguide structure design, the microstrip feed line is arranged on a PCB board and connected to a radio frequency chip, and the microstrip feed line is inserted into the end of the waveguide cavity. This design has defects: the insertion structure design needs to maintain a certain gap, which may cause energy leakage and other risks, resulting in significant insertion loss. The insertion structure design has high assembly difficulty, low production efficiency, and it is difficult to ensure product consistency. In addition, this design usually has high requirements for the assembly precision of parts, increasing the manufacturing cost of the product. Moreover, this design cannot completely separate the microstrip feed line and the waveguide cavity in space, further increasing the difficulty of product design, part manufacturing and assembly. SUMMARY

[0003] In view of the defects in the prior art, the utility model aims to provide a microstrip feed structure suitable for waveguide antenna and waveguide antenna.

[0004] According to the microstrip feed structure suitable for waveguide antenna provided by the utility model, the microstrip feed structure suitable for waveguide antenna comprises:

[0005] A nail bed structure is connected between the waveguide antenna 2 and the PCB substrate 7.

[0006] A microstrip lead-in gap 51 is arranged on the outer side of the waveguide opening 4 of the waveguide antenna 2 together with the nail bed structure.

[0007] The nail bed structure comprises a plurality of nail beds 5, and one end of the plurality of nail beds 5 is connected to the outer side of the waveguide opening 4 along the side direction of the waveguide opening 4.

[0008] The microstrip lead-in gap 51 is located on the outer side of a short side of the waveguide opening.

[0009] The microstrip feed line 6 on the PCB substrate 7 extends into the projection of the waveguide opening 4 on the PCB substrate 7 from the side where the microstrip lead-in gap 51 is located.

[0010] Further, the other end of the nail bed 5 is connected to the PCB substrate 7 or gap-fitted.

[0011] Further, the gap between the other end of the nail bed 5 and the PCB substrate 7 is 0mm-0.5mm.

[0012] Further, the projection of the microstrip feed line 6 and the midline of the short side on the PCB substrate 7 coincide.

[0013] Further, the end of the microstrip feed line 6 is located at the projection center of the waveguide opening 4 on the PCB substrate 7.

[0014] Further, in the nail bed structure corresponding to the short side, the microstrip lead-in gap 51 is formed between two adjacent nail beds 5.

[0015] Alternatively, there is no nail bed 5 in the extension direction of the outer side of the short side.

[0016] Further, the center distance between the two adjacent nail beds 5 is 1mm-1.5mm.

[0017] Further, the height of the nail bed 5 is 0.7mm-1.2mm.

[0018] Further, the material of the nail bed 5 is a non-conductive material, and the surface of the nail bed 5 is plated with a metal film; or the nail bed 5 is a conductive metal material.

[0019] According to the waveguide antenna provided by the application, the microstrip feed-in structure suitable for the waveguide antenna is provided.

[0020] Compared with the prior art, the utility model has the beneficial effects that:

[0021] 1) The microstrip-to-waveguide structure design adopts a nail bed structure, which can effectively reduce the loss of the microstrip-to-waveguide.

[0022] 2) The setting of the nail bed structure simultaneously reduces the precision requirement of the assembly of the waveguide antenna and the PCB, and is more conducive to improving the production efficiency and product quality and reducing the product manufacturing cost.

[0023] 3) The microstrip-to-waveguide structure can effectively separate the microstrip PCB substrate and the waveguide transmission line, and reduce the difficulty of structural design and assembly manufacturing.

[0024] 4) The microstrip-to-waveguide structure can be designed to adapt to the microstrip feed line fed into the waveguide port from the short side, so that the size of the multi-waveguide transmission line arranged transversely can be reduced, and the product volume can be more easily controlled. BRIEF DESCRIPTION OF DRAWINGS

[0025] Other features, objects and advantages of the utility model will become more apparent through reading the detailed description of the non-limiting embodiments with reference to the following drawings:

[0026] Figure 1 It is a schematic view of a traditional microstrip-to-waveguide structure.

[0027] Figure 2 It is a perspective view of the waveguide antenna.

[0028] Figure 3 It is a sectional view of the waveguide antenna.

[0029] Figure 4 It is a plan view of the microstrip feed-in structure. DETAILED DESCRIPTION

[0030] The utility model will be explained in detail below in combination with specific embodiments. The following embodiments will help the person skilled in the art to further understand the utility model, but do not limit the utility model in any form. It should be pointed out that, for those skilled in the art, without departing from the concept of the utility model, a number of changes and improvements can be made. These all belong to the protection scope of the utility model.

[0031] As shown in Figure 2 , Figure 3 and Figure 4 , the microstrip feed-in structure suitable for the waveguide antenna provided by the embodiment comprises a nail bed structure and a microstrip lead-in gap 51. The nail bed structure is connected between the waveguide antenna 2 and the PCB substrate 7, and the microstrip lead-in gap 51 is arranged outside the waveguide opening 4 of the waveguide antenna 2 together with the nail bed structure.

[0032] The nail bed structure comprises a plurality of nail beds 5. One end of the plurality of nail beds 5 is connected outside the waveguide opening 4 along the side direction of the waveguide opening 4, and the other end of the nail bed 5 is connected with or gap-fitted with the PCB substrate 7. The gap is 0mm-0.5mm. The center distance between the adjacent two nail beds 5 is 1mm-1.5mm, and the height of the nail bed 5 is 0.7mm-1.2mm. The nail bed 5 is made of non-conductive material, and the surface of the nail bed 5 is plated with a metal film. Alternatively, the nail bed 5 is made of conductive metal material.

[0033] There are two ways to constitute the microstrip lead-in gap 51. One is that the microstrip lead-in gap 51 is constituted between two adjacent nail beds 5 in the nail bed structure corresponding to the short side, which is suitable for the case that the short side is still relatively long compared with the microstrip feed line 6. The other is that there is no nail bed 5 in the extension direction outside the short side, and a one-side-opened nail bed structure is directly formed.

[0034] The microstrip lead-in gap 51 is located outside a short side of the waveguide opening, and the microstrip feed line 6 on the PCB substrate 7 extends into the projection of the waveguide opening 4 on the PCB substrate 7 from the side where the microstrip lead-in gap 51 is located.

[0035] The microstrip feed line 6 coincides with the projection of the short side midline onto the PCB substrate 7, and the end of the microstrip feed line 6 is located at the projection center of the waveguide opening 4 onto the PCB substrate 7.

[0036] like Figure 2 , Figure 3 As shown, this embodiment also provides a waveguide antenna, including the above-mentioned bed of nails structure, which is suitable for the 76GHz-81GHz frequency band and can be matched with existing traditional microstrip radio frequency chips, bringing the feasibility of developing next-generation waveguide antenna radars to radar manufacturers.

[0037] The waveguide antenna 2 is designed with a waveguide transmission line 1, a bed of nails structure and a slot antenna subarray 21. The base material is a good electrical conductor (such as aluminum alloy, copper alloy, etc.) or plastic material with a metal film coated on the surface.

[0038] The design of two or more microstrip feed lines 6, perpendicular to the short side of the waveguide opening 4 and centered on the opening 4, is mounted on a PCB substrate 7. With appropriate sizing, the microstrip feed lines 6 can generate an alternating electromagnetic field perpendicular to the long side of the waveguide transmission line 1 within the waveguide cavity, thereby forming an electromagnetic wave that can propagate in the waveguide transmission line 1. The number of microstrip feed lines 6 depends on the chip specifications and radar performance requirements, and they are integrated onto the PCB substrate 7 using PCB printing technology. Various sizes of microstrip feed lines 6 can be designed, and no specific size is limited here.

[0039] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0040] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A microstrip feed structure suitable for use with a waveguide antenna, characterized by, The application relates to a microstrip feed-in structure for a waveguide antenna. The microstrip feed-in structure comprises: a peg bed structure connected between the waveguide antenna (2) and a PCB substrate (7); a microstrip feed-in gap (51) arranged outside the waveguide opening (4) of the waveguide antenna (2) in cooperation with the peg bed structure; wherein the peg bed structure comprises a plurality of peg beds (5), one end of the peg beds (5) being connected outside the waveguide opening (4) along the side direction of the waveguide opening (4); the microstrip feed-in gap (51) is located outside a short side of the waveguide opening (4); 2. The microstrip feed structure suitable for use with a waveguide antenna according to claim 1, wherein, a microstrip feed line (6) on the PCB substrate (7) extends into the projection of the waveguide opening (4) on the PCB substrate (7) from the side where the microstrip feed-in gap (51) is located.

3. The microstrip feed structure suitable for use with a waveguide antenna according to claim 2, wherein, The other end of the peg bed (5) is connected to the PCB substrate (7) or is in clearance fit.

4. The microstrip feed structure suitable for use with a waveguide antenna according to claim 1, wherein, The clearance between the other end of the peg bed (5) and the PCB substrate (7) is 0mm-0.5mm.

5. The microstrip feed structure suitable for use with a waveguide antenna according to claim 1, wherein, The center line of the short side coincides with the projection of the microstrip feed line (6) on the PCB substrate (7).

6. The microstrip feed structure suitable for use with a waveguide antenna according to claim 1, wherein, The end of the microstrip feed line (6) is located at the center of the projection of the waveguide opening (4) on the PCB substrate (7). In the peg bed structure corresponding to the short side, the microstrip feed-in gap (51) is formed between two adjacent peg beds (5).

7. The microstrip feed structure suitable for use with a waveguide antenna according to claim 1, wherein, Alternatively, there is no peg bed (5) in the extension direction outside the short side.

8. The microstrip feed structure suitable for use with a waveguide antenna according to claim 1, wherein, The center distance between the two adjacent peg beds (5) is 1mm-1.5mm.

9. The microstrip feed structure suitable for use with a waveguide antenna according to claim 1, wherein, The height of the peg bed (5) is 0.7mm-1.2mm.

10. A waveguide antenna, characterized by The peg bed (5) is made of non-conductive material, and the surface of the peg bed (5) is plated with a metal film (3); or the peg bed (5) is made of conductive metal material. The application further discloses a microstrip feed-in structure for a waveguide antenna.

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