Base station antenna feed network

Abstract

The utility model provides a base station antenna feed network, which comprises a cavity, a feed circuit and a PCB dielectric layer, the feed circuit and the PCB dielectric layer are both arranged in the cavity, the feed circuit comprises preset circuit layers respectively arranged at two sides of the PCB dielectric layer, and the PCB dielectric layer corresponding to more than 90% of an area within a range of 3mm outside the preset circuit layer is hollowed out to form a PCB dielectric clearance area. In the scheme, the PCB dielectric layer corresponding to more than 90% of the area within the range of 3mm outside the preset circuit layer is hollowed out to form the PCB dielectric clearance area, equivalently, the shape and the contour of the part, corresponding to the position of the feed circuit, of the PCB dielectric layer are similar, namely the shape is the same, and most of the area outside the feed circuit is not provided with the PCB dielectric layer, so that the PCB dielectric clearance area is formed, and therefore, the PCB dielectric clearance area is formed. The feed loss of the feed network can be reduced, and the efficiency of the feed network is improved, so that the efficiency of the base station antenna is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of communications, and in particular relates to a base station antenna feeding network. Background Art

[0002] With the rapid development of wireless communications, base station antennas are also developing towards green and efficient directions. The base station antenna feed network is one of the main components of antenna energy loss, so reducing the feed network loss is the main way to improve antenna efficiency.

[0003] The current base station antenna uses a phase shifter feeding network with a cavity stripline structure, which mainly includes a cavity, a feeding line, a phase shifting medium, and a line support component. There are two main types of feeding lines: a PCB feeding line with a PCB as a substrate and a feeding line with an aluminum alloy as a substrate.

[0004] In a stripline feeder circuit with a PCB as a substrate, the electrical characteristics of the material of the PCB substrate have a direct impact on the feeder circuit loss. Therefore, the present application proposes a design scheme for reducing the feeder circuit loss in a stripline feeder network with a PCB as a substrate. Utility Model Content

[0005] The technical purpose of the utility model is to provide a base station antenna feeding network, aiming to reduce the energy loss of the feeding network, so that the efficiency of the feeding network is improved, thereby improving the efficiency of the base station antenna.

[0006] In order to solve the above technical problems, the utility model is implemented as follows: a base station antenna feeding network is provided, including a cavity, a feeding line and a PCB dielectric layer, wherein the feeding line and the PCB dielectric layer are both placed in the cavity, the feeding line includes preset circuit layers arranged on both sides of the PCB dielectric layer, and the PCB dielectric layer corresponding to more than 90% of the area within 3 mm outside the preset circuit layer is hollowed out to form a PCB dielectric clearance area.

[0007] Furthermore, the preset circuit layers are parallel to each other, and different preset circuit layers are connected by forming metallized vias in the PCB dielectric layer.

[0008] Furthermore, the PCB dielectric layer corresponding to the area within 0.1-3 mm outside the preset circuit layer is hollowed out to form the PCB dielectric clearance area.

[0009] Furthermore, the PCB dielectric layer corresponding to the area within 0.2-3 mm outside the preset circuit layer is hollowed out to form the PCB dielectric clearance area.

[0010] Furthermore, at least a portion of the area outside 3 mm outside the preset circuit corresponding to the PCB dielectric layer is hollowed out as a part of the PCB dielectric clearance area.

[0011] Furthermore, the PCB dielectric layer and the feeder line are made of double-sided PCB copper-clad laminate.

[0012] Furthermore, the cavity is a die-cast metal cavity, and the feed line and the PCB dielectric layer are placed in the middle of the cavity in the height direction.

[0013] Furthermore, the feeder line and the PCB dielectric layer are replaced to be placed in the middle position of the cavity in the height direction and offset in one direction by a predetermined distance.

[0014] Furthermore, the PCB dielectric layer includes a support structure connected to an edge of the preset circuit layer and located outside the PCB dielectric clearance area.

[0015] Furthermore, the support structure includes an annular frame surrounding the preset circuit layer, and the preset circuit layer includes a circuit pad extending to the annular frame.

[0016] Compared with the prior art, the base station antenna feeding network in the utility model has the following beneficial effects:

[0017] In this solution, a PCB dielectric clearance zone is formed by hollowing out the PCB dielectric layer corresponding to more than 90% of the area within 3 mm outside the preset circuit layer, which is equivalent to the shape and contour of the corresponding part of the PCB dielectric layer and the feeder line position being similar, that is, common, and most of the area outside the feeder line has no PCB dielectric layer, forming a PCB dielectric clearance zone. In this way, the feeding loss of the feeding network can be reduced, the efficiency of the feeding network can be improved, and the efficiency of the base station antenna can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of a single line of a base station antenna feed network cut away from a side view in an embodiment of the utility model;

[0019] Figure 2 It is a schematic diagram of the feeding circuit and PCB dielectric layer structure of the base station antenna feeding network in the embodiment of the utility model;

[0020] Figure 3 yes Figure 2 Enlarged view of detail A.

[0021] In the accompanying drawings, each figure mark represents: 1. cavity; 2. feeding line; 21. preset circuit layer; 22. metallized via; 23. circuit pad; 3. PCB dielectric layer; 31. supporting structure; 32. PCB dielectric clearance area; 311. annular frame. DETAILED DESCRIPTION

[0022] The embodiments of the utility model are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the utility model, and cannot be understood as limiting the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the utility model.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "circumferential", "radial" and the like 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, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0025] In this embodiment, combined with Figure 1-3 , a base station antenna feeding network is provided, including a cavity 1, a feeding line 2 and a PCB dielectric layer 3, the feeding line 2 and the PCB dielectric layer 3 are both placed in the cavity 1, the feeding line 2 includes a preset circuit layer 21 arranged on both sides of the PCB dielectric layer 3, and the PCB dielectric layer 3 corresponding to more than 90% of the area within 3 mm outside the preset circuit layer 21 is hollowed out to form a PCB dielectric clearance area 32.

[0026] In the present solution, the PCB dielectric clearance area 32 is formed by hollowing out the PCB dielectric layer 3 corresponding to more than 90% of the area within the 3 mm range outside the preset circuit layer 21, which is equivalent to the shape and contour of the corresponding part of the PCB dielectric layer 3 and the feeder line 2 being similar, that is, common, and most of the area outside the feeder line 2 does not have the PCB dielectric layer 3, forming a PCB dielectric clearance area 32. In this way, the feeding loss of the feeding network can be reduced, the efficiency of the feeding network can be improved, and the efficiency of the base station antenna can be improved.

[0027] It should be understood that hollowing out the PCB dielectric layer 3 corresponding to more than 90% of the area within 3 mm outside the preset circuit layer 21 to form a PCB dielectric clearance area 32 only refers to most of the outside of the preset circuit layer 21, not all of the outside. When the outside of the preset circuit layer 21 has necessary fixed support points, the area of ​​the fixed support points is not hollowed out.

[0028] Furthermore, the preset circuit layers 21 are parallel to each other, and different preset circuit layers 21 are connected by forming metallized vias 22 on the PCB dielectric layer 3. Specifically, in the present embodiment, the PCB dielectric layer 3 and the feeder circuit 2 are made of a double-sided PCB copper-clad board, and both sides of the double-sided PCB copper-clad board have copper-clad layers. The copper-clad layers first form the preset circuit layer 21, and then, a hollow area is formed by removing the material of the PCB dielectric layer 3 in the PCB dielectric clearance area 32 to reduce the feeding loss of the feed network. The preset circuit layer 21 can be designed in any form according to the electrical characteristics of actual requirements, and the metallized vias 22 on the circuit can be set according to the required spacing to connect the preset circuit layers 21 on both sides of the PCB dielectric layer 3.

[0029] The range of the PCB dielectric clearance area 32 can be deformed in a variety of ways. Due to the influence of processing accuracy in the actual production process, in order to avoid damage to the preset circuit layer 21 during processing, a part of the PCB dielectric material is reserved on the outside of the preset circuit layer 21, that is, it can be set to hollow out the PCB dielectric layer 3 corresponding to the area within 0.1-3mm outside the preset circuit layer 21 to form a PCB dielectric clearance area 32, or the PCB dielectric layer 3 corresponding to the area within 0.2-3mm outside the preset circuit layer 21 is hollowed out to form a PCB dielectric clearance area 32, or the PCB dielectric layer 3 corresponding to the area within 3mm from the outside of the preset circuit layer 21 is hollowed out to form a PCB dielectric clearance area 32. The main effective range is within 0-3mm from the preset circuit, and this distance is a range with a better effect of reducing losses.

[0030] It should be understood that it is also possible for the PCB dielectric clearance area 32 to exceed the 3mm range outside the preset circuit layer 21, that is, the hollowing out of the PCB dielectric layer 3 corresponding to at least part of the area outside the preset circuit 3mm can be used as a part of the PCB dielectric clearance area 32, but the influence of the medium exceeding the 3mm range on the feeder line 2 will become smaller and smaller, such as within 0-4mm, 0-5mm, etc. outside the preset circuit layer 21. Therefore, the design of increasing the clearance area also falls within the protection range of 0-3mm of this application, and this application focuses on protecting the range design of the PCB dielectric clearance area 32 of 0-3mm.

[0031] Further, the cavity 1 is a die-cast metal cavity 1, and the feeder line 2 and the PCB dielectric layer 3 are placed in the middle position of the height direction of the cavity 1. In the present embodiment, the cavity 1 is a die-cast metal cavity 1 with an inner height of 6 mm and a wall thickness of 1-2 mm. It should be understood that the inner height and wall thickness of the cavity 1 can be adjusted according to actual conditions and are not limited here. In some embodiments, the feeder line 2 and the PCB dielectric layer 3 are replaced by being placed in the middle position of the height direction of the cavity 1 and offset in one direction by a predetermined distance, for example, offset upward by 1-2 mm in the height direction.

[0032] Furthermore, the PCB dielectric layer 3 includes a support structure 31 connected to the edge of the preset circuit layer 21 and located outside the PCB dielectric clearance area 32 .

[0033] Specifically, in the present embodiment, the support structure 31 includes an annular frame 311 surrounding the outside of the preset circuit layer 21, and the preset circuit layer 21 includes a circuit pad 23 extending to the annular frame 311. The annular frame 311 can be used to fix with the cavity 1, so that the feeder circuit 2 is fixed in the cavity 1, and the PCB medium area corresponding to the feeder circuit 2 is connected to the annular frame 311, and the support structure 31 can also include a support edge arranged between the outer sides of two adjacent preset circuit layers 21 with a distance exceeding 3mm and / or a support edge of the outer side of the preset circuit layer 21 and the annular frame 311 bracket. Through the arrangement of the support structure 31, on the one hand, the structure of the feeder circuit 2 itself is stable, and on the other hand, the feeder circuit 2 can be stably fixed on the cavity 1.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A base station antenna feeding network, characterized in that: It includes a cavity, a feeder circuit and a PCB dielectric layer, wherein the feeder circuit and the PCB dielectric layer are both placed in the cavity, the feeder circuit includes preset circuit layers arranged on both sides of the PCB dielectric layer, and the PCB dielectric layer corresponding to more than 90% of the area within 3 mm outside the preset circuit layer is hollowed out to form a PCB dielectric clearance area.

2. The base station antenna feeding network according to claim 1, characterized in that: The preset circuit layers are parallel to each other, and different preset circuit layers are connected by forming metallized vias in the PCB dielectric layer.

3. The base station antenna feeding network according to claim 1, characterized in that: The PCB dielectric layer corresponding to the area within 0.1-3 mm outside the preset circuit layer is hollowed out to form the PCB dielectric clearance area.

4. The base station antenna feeding network according to claim 1, characterized in that: The PCB dielectric layer corresponding to the area within 0.2-3 mm outside the preset circuit layer is hollowed out to form the PCB dielectric clearance area.

5. The base station antenna feeding network according to claim 3 or 4, characterized in that: The PCB dielectric layer corresponding to at least a portion of the area outside 3 mm outside the preset circuit is hollowed out as a part of the PCB dielectric clearance area.

6. The base station antenna feeding network according to claim 1, characterized in that: The PCB dielectric layer and the feeder line are made of double-sided PCB copper-clad plates.

7. The base station antenna feeding network according to claim 1, characterized in that: The cavity is a die-cast metal cavity, and the feeder circuit and the PCB dielectric layer are placed in the middle of the cavity in the height direction.

8. The base station antenna feeding network according to claim 7, characterized in that: The feed line and the PCB dielectric layer are replaced to be placed in the middle of the cavity in the height direction and offset in one direction by a predetermined distance.

9. The base station antenna feeding network according to claim 1, characterized in that: The PCB dielectric layer includes a support structure connected to the edge of the preset circuit layer and located outside the PCB dielectric clearance area.

10. The base station antenna feeding network according to claim 9, characterized in that: The support structure includes an annular frame surrounding the preset circuit layer, and the preset circuit layer includes a circuit pad extending to the annular frame.

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