Downward inclination angle adjusting device and base station antenna

Abstract

The invention relates to the technical field of antenna communication, and provides a downward inclination angle adjusting device and a base station antenna. The downward inclination angle adjusting device comprises a support, a phase shifting assembly and a switching assembly, the phase shifting assembly comprises a screw and a nut, the nut is rotationally connected to the support, a gear structure is formed on the outer side face of the nut, the switching assembly comprises a transmission gear and a transmission rack, and the transmission gear is rotationally connected to the support and driven by a first driving mechanism to rotate; a cam is arranged on the transmission rack, the transmission rack is driven by a second driving mechanism to move, and the transmission gear is configured to be engaged with the gear structure when the cam abuts against the transmission rack and be disengaged from the gear structure when the cam does not abut against the transmission rack. According to the downward inclination angle adjusting device, switchable phase adjustment among the multiple phase shifters can be achieved only through the first driving mechanism and the second driving mechanism, driving structures corresponding to the antenna frequency band number do not need to be arranged, the antenna size is effectively reduced, and the antenna weight is reduced.

Description

Technical Field

[0001] The present application relates to the field of antenna communication technology, and in particular to a downtilt angle adjustment device and a base station antenna. Background Art

[0002] Currently, base station antennas use two main methods for adjusting downtilt: mechanical downtilt and electrical downtilt. Electrical downtilt works by changing the phase of the phase shifter, thereby changing the phase of the antenna element. This in turn changes the amplitude of the vertical and horizontal components, altering the field strength of the combined component and ultimately changing the vertical energy distribution of the antenna.

[0003] As the number of mobile communication frequency bands continues to increase, operators' relative site resources are becoming increasingly scarce. Therefore, the emergence of multi-frequency electrically tilted antennas has helped operators address site resource constraints. However, multi-frequency electrically tilted antennas require independent downtilt control for each communication frequency band. Typically, multiple motors are used to adjust the downtilt angle for each frequency band. This results in large size, high weight, and significant wind load, making them unable to meet the trend of antenna miniaturization. Summary of the Invention

[0004] In order to solve the above technical problem or at least partially solve the above technical problem, the present application provides a downtilt angle adjustment device and a base station antenna.

[0005] A first aspect of the present application provides a downtilt angle adjustment device, comprising:

[0006] Bracket;

[0007] A phase shift assembly, comprising a screw and a nut, wherein the nut is sleeved on the outside of the screw and engages with the screw thread, the nut is rotatably connected to the bracket, and a gear structure is formed on the outer side of the nut;

[0008] a switching assembly including a transmission gear and a transmission rack;

[0009] The transmission gear is rotatably connected to the bracket and driven to rotate by a first driving mechanism, and an elastic member is provided between the transmission gear and the bracket;

[0010] A cam is provided on the transmission rack, and the transmission rack is driven to move by a second driving mechanism to drive the cam to abut or release the abutment with the transmission gear;

[0011] The transmission gear is configured to move toward the nut relative to the bracket and engage with the gear structure when the cam abuts, and to move away from the nut relative to the bracket through the elastic member and disengage from the gear structure when the cam releases the abutment.

[0012] Optionally, there are multiple phase shifting components and multiple transmission gears, and they are arranged in a one-to-one correspondence, and the cam can switchably abut against one of the multiple transmission gears;

[0013] The plurality of phase shifting components are sequentially spaced apart along a first direction, and the plurality of transmission gears are sequentially spaced apart along a second direction, and the first direction is parallel to the second direction.

[0014] Optionally, the transmission gear is rotatably connected to the bracket via a first rotating shaft, and the first rotating shaft is further provided with a first bevel gear;

[0015] The first driving mechanism includes a first driving member and a transmission shaft. The output end of the first driving member is connected to the second bevel gear. The transmission shaft is provided with a third bevel gear and multiple fourth bevel gears. The third bevel gear is meshed with the second bevel gear for transmission, and the multiple fourth bevel gears are meshed with the multiple first bevel gears for transmission one by one.

[0016] Optionally, the transmission gear is slidingly engaged with the first rotating shaft along the axial direction of the first rotating shaft.

[0017] Optionally, a first limiting surface is formed on the first rotating shaft, and the first limiting surface is extended along the axial direction of the first rotating shaft;

[0018] A through hole is provided at the center of the transmission gear, a first matching surface is formed on the inner wall surface of the through hole, the first rotating shaft is inserted into the through hole, and the first limiting surface and the first matching surface are positioned and abutted against each other.

[0019] Optionally, the second driving mechanism includes a second driving member and a driving gear connected to the second driving member, the driving gear is engaged with the transmission rack for transmission, and the transmission rack moves along the arrangement direction of the transmission gears.

[0020] Optionally, a first stop block is provided on the screw rod, a second stop block is provided on the nut, and the phase shift assembly is configured to have a zero position and a phase shift position. When the phase shift assembly is at the zero position, the first stop block and the second stop block abut against each other.

[0021] Optionally, an anti-rotation hole is opened on the bracket, a second limiting surface is formed on the screw, a second mating surface is formed on the inner wall surface of the anti-rotation hole, the screw is passed through the anti-rotation hole, and the second limiting surface and the second mating surface are positioned and abutted against each other.

[0022] Optionally, a receiving groove is provided on the bracket, the notch of the receiving groove is arranged toward the transmission gear, and the elastic member elastically abuts between the bottom wall of the receiving groove and the transmission gear.

[0023] A second aspect of the present application provides a base station antenna, comprising a phase shifter and a downtilt angle adjustment device as described in any one of the above items, wherein the screw of the downtilt angle adjustment device is configured to adjust the phase of the phase shifter.

[0024] The technical solution provided by the embodiments of the present application has the following advantages compared with the prior art:

[0025] The downtilt angle adjustment device and base station antenna provided by the present application include a bracket, a phase shifting assembly and a switching assembly. The nut is connected to the bracket and can only rotate relative to the bracket. In this way, when the nut rotates, it can drive the screw to move along its own axial direction. The phase of the phase shifter can be adjusted by the displacement of the screw. The second driving mechanism can drive the transmission rack to move, and the cam can follow the transmission rack to move so that the cam can abut against the transmission gear. Under the action of the cam, the transmission gear moves relative to the bracket until the transmission gear and the gear structure outside the nut can engage with each other. When the first driving mechanism drives the transmission gear to rotate, the nut can rotate accordingly, thereby driving The screw rod is displaced until the phase adjustment of the phase shifter is completed. When the transmission rack continues to move, the cam can be released from the abutment with the transmission gear. Under the action of the elastic member, the transmission gear is disengaged from the gear structure outside the nut. At this point, the phase adjustment of the phase shifter at the current position is completed. The transmission rack can move further to adjust the phase of the phase shifter at other positions, that is, switchable phase adjustment between multiple phase shifters can be achieved. There is no need to set a drive structure corresponding to the number of antenna frequency bands. Only the first drive mechanism and the second drive mechanism can switch different positions to adjust the phase of multiple phase shifters, which can effectively reduce the size of the antenna, reduce the weight of the antenna, and improve the reliability of the antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0028] Figure 1 This is a schematic structural diagram of a downtilt angle adjustment device according to an embodiment of the present application;

[0029] Figure 2 for Figure 1 A partial enlarged view of part A in the middle;

[0030] Figure 3A cross-sectional view of a downtilt angle adjustment device according to an embodiment of the present application;

[0031] Figure 4 A schematic structural diagram of a downtilt angle adjustment device according to an embodiment of the present application from another perspective;

[0032] Figure 5 for Figure 4 A partial enlarged view of part B in the middle;

[0033] Figure 6 This is a structural schematic diagram of a downtilt angle adjustment device according to an embodiment of the present application from another perspective;

[0034] Figure 7 This is a schematic structural diagram of a transmission rack according to an embodiment of the present application;

[0035] Figure 8 This is a structural diagram of a nut according to an embodiment of the present application;

[0036] Figure 9 This is a schematic structural diagram of a screw rod according to an embodiment of the present application.

[0037] In the figure: 1. bracket; 11. anti-rotation hole; 12. accommodating groove; 2. phase shifting assembly; 21. screw; 211. first stop block; 212. second limiting surface; 22. nut; 221. gear structure; 222. second stop block; 223. second rotating shaft; 224. limiting ring; 3. switching assembly; 31. transmission gear; 311. first mating surface; 32. transmission rack; 321. cam; 33. elastic member; 34. first rotating shaft; 341. first bevel gear; 342. first limiting surface; 4. first driving mechanism; 41. transmission shaft; 411. third bevel gear; 412. fourth bevel gear; 42. second bevel gear; 5. second driving mechanism; 51. driving gear. DETAILED DESCRIPTION

[0038] In order to more clearly understand the above-mentioned objectives, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0039] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application can also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present application, not all of the embodiments.

[0040] The downtilt angle adjustment device and the base station antenna are described in detail below through specific embodiments:

[0041] Reference Figures 1 to 9As shown, some embodiments of the present application provide a downtilt angle adjustment device, including a bracket 1, a phase shifting component 2 and a switching component 3.

[0042] Among them, the phase shifting assembly 2 includes a screw 21 and a nut 22. The nut 22 is sleeved on the outside of the screw 21 and is threadedly engaged with the screw 21. The nut 22 is rotatably connected to the bracket 1, that is, the nut 22 is connected to the bracket 1 and can only rotate relative to the bracket 1. In this way, when the nut 22 rotates, it can drive the screw 21 to move along its own axial direction. The phase of the phase shifter can be adjusted by the displacement of the screw 21.

[0043] Specifically, the switching assembly 3 includes a transmission gear 31 and a transmission rack 32. The transmission gear 31 is rotatably connected to the bracket 1 and is driven to rotate by the first driving mechanism 4. An elastic member 33 is provided between the transmission gear 31 and the bracket 1. The transmission gear 31 can move relative to the bracket 1 and can restore to its original position under the action of the elastic member 33.

[0044] A cam 321 is provided on the transmission rack 32, and the transmission rack 32 is driven to move by the second driving mechanism 5 to drive the cam 321 to abut or release the abutment with the transmission gear 31. A gear structure 221 is formed on the outer side of the nut 22. The transmission gear 31 is configured to move toward the nut 22 relative to the bracket 1 and engage with the gear structure 221 when the cam 321 abuts, and to move away from the nut 22 relative to the bracket 1 and release the meshing with the gear structure 221 through the elastic member 33 when the cam 321 releases the abutment.

[0045] That is to say, the second driving mechanism 5 can drive the transmission rack 32 to move, and the cam 321 can move following the transmission rack 32, so that the cam 321 can abut against the transmission gear 31. Under the action of the cam 321, the transmission gear 31 moves relative to the bracket 1 until the transmission gear 31 and the gear structure 221 outside the nut 22 can engage with each other. When the first driving mechanism 4 drives the transmission gear 31 to rotate, the nut 22 can rotate accordingly, thereby driving the screw 21 to move until the phase adjustment of the phase shifter is completed.

[0046] When the transmission rack 32 continues to move, the cam 321 can be released from the abutment with the transmission gear 31. Under the action of the elastic member 33, the transmission gear 31 is disengaged from the gear structure 221 outside the nut 22. At this point, the phase adjustment of the phase shifter at the current position is completed, and the transmission rack 32 can move further to adjust the phase of the phase shifter at other positions, that is, it is possible to achieve switchable phase adjustment between multiple phase shifters. There is no need to set a drive structure corresponding to the number of antenna frequency bands. Only the first drive mechanism 4 and the second drive mechanism 5 can switch different positions to adjust the phase of multiple phase shifters, which can effectively reduce the size of the antenna, reduce the weight of the antenna, and improve the reliability of the antenna.

[0047] In some embodiments, there are multiple phase shifting assemblies 2 and transmission gears 31, and they are arranged in a one-to-one correspondence, wherein multiple screws 21 correspond to phase shifters of multiple frequency bands, and the cam 321 can switchably abut against one of the multiple transmission gears 31 to adjust the phase of only one phase shifter at the same time. During the movement of the transmission rack 32 and the cam 321, the phase of each phase shifter is adjusted to ensure that the phase of each phase shifter can be moved into place.

[0048] Reference Figure 1 As shown, multiple phase shifting assemblies 2 are spaced apart in a first direction, and multiple transmission gears 31 are spaced apart in a second direction. The first and second directions are parallel, meaning that the line formed by the centers of the multiple transmission gears 31 is parallel to the axis formed by the centers of the nuts 22 in the multiple phase shifting assemblies 2, and there is no spatial interference between them. With this arrangement, when the transmission rack 32 moves in one direction, the cams 321 on the transmission rack 32 abut against the transmission gears 31 one by one, allowing the phase shifter 2 to adjust its phase one by one.

[0049] Specifically, the transmission rack 32 is extended along the arrangement direction of the plurality of transmission gears 31 .

[0050] For example, the transmission rack 32 is provided with two cams 321. The two cams 321 are configured to push a set of transmission gears 31 into engagement with the nut 22 when in different positions. When the cams 321 are not pushing the transmission gears 31, the elastic member 33 pushes the transmission gears 31 out, disengaging the transmission gears 31 from the nut 22. Furthermore, when two cams 321 are provided on the transmission rack 32, by properly positioning the cams 321, it is possible to ensure that the cams 321 sequentially contact the transmission gears 31 during movement, while reducing the travel of the transmission rack 32 and improving the efficiency of downcast angle adjustment.

[0051] When implementing it, refer to Figure 3 and Figure 4 As shown, the transmission gear 31 is rotatably connected to the bracket 1 via the first rotating shaft 34, and the first rotating shaft 34 is also provided with a first bevel gear 341. In other words, the first rotating shaft 34 is provided on the bracket 1 and can rotate relative to the bracket 1, and when the first rotating shaft 34 rotates, the transmission gear 31 and the first bevel gear 341 can rotate synchronously.

[0052] In some embodiments, the first driving mechanism 4 includes a first driving member and a transmission shaft 41. The output end of the first driving member is connected to the second bevel gear 42. A third bevel gear 411 and multiple fourth bevel gears 412 are provided on the transmission shaft 41. The third bevel gear 411 is meshed with the second bevel gear 42 for transmission, and the multiple fourth bevel gears 412 are meshed with the multiple first bevel gears 341 one by one for transmission.

[0053] In specific implementation, the first driving member can drive the second bevel gear 42 to rotate, thereby driving the third bevel gear 411 engaged with the second bevel gear 42 to rotate, and then driving the transmission shaft 41 to rotate. The fourth bevel gear 412 on the transmission shaft 41 can rotate synchronously, thereby driving the first bevel gear 341 engaged with the fourth bevel gear 412 to rotate, and by driving the first rotating shaft 34 to rotate, the transmission gear 31 can be driven to rotate.

[0054] There are multiple fourth bevel gears 412 set on the transmission shaft 41, and they correspond one-to-one to multiple transmission gears 31. Multiple transmission gears 31 can be driven to rotate by a first driving member. When the phase of the phase shifter needs to be adjusted, the cam 321 abuts against one of the transmission gears 31 so that it can engage with the nut 22 gear, thereby realizing the displacement of the screw 21 along its own axial direction. The present application has a simple structure, light weight, fewer mechanical transmission chains, and a compact mechanical structure.

[0055] In some embodiments, reference Figure 1 and Figure 2 As shown, the transmission gear 31 is slidably engaged with the first rotating shaft 34 along the axial direction of the first rotating shaft 34. It is understood that the transmission gear 31 can slide along the axial direction of the first rotating shaft 34 to achieve engagement with the external gear structure 221 of the nut 22 while ensuring that the first rotating shaft 34 does not undergo axial displacement, thereby ensuring that the first bevel gear 341 is always engaged with the fourth bevel gear 412 to transmit power.

[0056] In specific implementation, a first limiting surface 342 is formed on the first rotating shaft 34, and the first limiting surface 342 is extended along the axial direction of the first rotating shaft 34. A through hole is opened in the center of the transmission gear 31, and a first mating surface 311 is formed on the inner wall surface of the through hole. The first rotating shaft 34 is inserted into the through hole, and the first limiting surface 342 and the first mating surface 311 are positioned and abutted against each other to achieve the purpose of anti-rotation.

[0057] Specifically, a first limiting surface 342 is formed on the first rotating shaft 34, and a first mating surface 311 is formed on the inner wall of the through hole. This means that the cross-sections of the first rotating shaft 34 and the through hole can both be formed into irregular shapes. This prevents relative rotation when the first rotating shaft 34 is inserted into the through hole. This arrangement allows the transmission gear 31 to both move axially along the first rotating shaft 34 and rotate driven by the first rotating shaft 34, thereby driving the nut 22 to rotate.

[0058] For example, referring to Figure 2As shown, the cross section of the first rotating shaft 34 is formed into a hexagonal cross section, and any of its faces can be formed into a first limiting surface 342, thus achieving the purpose of anti-rotation. Of course, the cross section of the first rotating shaft 34 can also be formed into a triangle or polygon, or a protrusion or groove can be provided on the surface of the first rotating shaft 34, and the wall surface of the protrusion or groove forms the first limiting surface 342, or the first rotating shaft 34 is formed into a flat shaft, and its side surface can be formed into the first limiting surface 342. This application is not limited to this, as long as the shapes of the first rotating shaft 34 and the through hole can be adapted so that the transmission gear 31 can not only move along the axial direction of the first rotating shaft 34, but also rotate under the drive of the first rotating shaft 34.

[0059] In some embodiments, the second drive mechanism 5 includes a second drive member and a driving gear 51 connected to the second drive member. The driving gear 51 meshes with the transmission rack 32 for transmission, and the transmission rack 32 moves along the arrangement direction of the transmission gears 31. In a specific implementation, the driving gear 51 is a spur gear. The driving gear 51 meshes with the transmission rack 32 for transmission, thereby converting the rotational motion of the driving gear 51 into linear motion of the transmission rack 32, thereby driving the linear motion of the cam 321, so that the cam 321 can switchably abut against different transmission gears 31.

[0060] In specific implementation, the first driving member and the second driving member can be driving motors. Multiple outputs can be achieved by using two driving motors, which not only reduces the number of motors, but also reduces the cost and weight of the antenna; since the number of driving motors is relatively small, the control circuit board is relatively simple and the program is also simple, which improves the control reliability of the antenna; this device is an integrated design, which can realize integrated assembly, and is easy to achieve standardized and automated assembly, thereby improving assembly efficiency and reducing production costs.

[0061] Reference Figure 5 As shown, the screw 21 is provided with a first stop 211, and the nut 22 is provided with a second stop 222. The phase shift assembly 2 is configured to have a zero position and a phase shift position. When the phase shift assembly 2 is in the zero position, the first stop 211 and the second stop 222 abut against each other. It will be understood that when the first stop 211 and the second stop 222 abut against each other, the nut 22 and the screw 21 are relatively stationary, that is, neither relative rotation nor relative sliding occurs. At this time, the screw 21 and the phase shifter are in the initial zero position. When the nut 22 begins to rotate, the screw 21 can move along its own axis to begin adjusting the phase of the phase shifter and adjust the downtilt angle of the antenna.

[0062] In this application, the terminal output is the rotational motion of the nut 22 and the linear motion of the screw 21, which has the characteristics of high-precision output and self-locking. In addition, this application has very low requirements for the precision control of the motor and even lower requirements for the motor, which is conducive to low-cost control.

[0063] Continue to refer to Figure 5 As shown, an anti-rotation hole 11 is opened on the bracket 1, a second limiting surface 212 is formed on the screw 21, a second matching surface is formed on the inner wall surface of the anti-rotation hole 11, the screw 21 is passed through the anti-rotation hole 11, and the second limiting surface 212 and the second matching surface are positioned and abutted against each other.

[0064] In other words, the cross-sections of the anti-rotation hole 11 and the screw 21 can both be formed into irregular shapes, preventing relative rotation when the screw 21 is inserted into the anti-rotation hole 11. With this arrangement, the rotation of the screw 21 is restricted, allowing only axial movement, thereby enabling phase adjustment of the phase shifter. Specifically, the screw 21 can be formed into a flat structure, with its side surface formed as a second limiting surface 212, effectively preventing the screw 21 from rotating on the bracket 1.

[0065] In specific implementation, the nut 22 is rotatably connected to the bracket 1 through the second rotating shaft 223. The nut 22 is set on the second rotating shaft 223. A through hole is commonly opened in the center of the nut 22 and the second rotating shaft 223. The screw 21 is passed through the through hole and can rotate in the through hole to ensure that the nut 22 can rotate.

[0066] Specifically, the second rotating shaft 223 is set through the bracket 1, and a limiting ring 224 is set at one end of the second rotating shaft 223. The limiting ring 224 abuts against one side of the bracket 1, and the nut 22 is located on the other side of the bracket 1. In this way, the nut 22 can be connected and fixed on the bracket 1.

[0067] In some embodiments, reference Figure 3 As shown, the bracket 1 is provided with a receiving groove 12, the notch of the receiving groove 12 being arranged toward the transmission gear 31, and the elastic member 33 elastically abuts between the bottom wall of the receiving groove 12 and the transmission gear 31. It is understood that the elastic member 33 is located within the receiving groove 12, and the position of the elastic member 33 can be determined by the receiving groove 12. The two ends of the elastic member 33 respectively abut against the bottom of the receiving groove 12 and the transmission gear 31, ensuring that the elastic force is sufficient to enable the transmission gear 31 to move toward or away from the bracket 1, while ensuring the stability of the installation of the elastic member 33.

[0068] Some other embodiments of the present application provide a base station antenna, comprising a phase shifter and a downtilt angle adjustment device as described above, wherein the screw 21 of the downtilt angle adjustment device is configured to adjust the phase of the phase shifter.

[0069] The base station antenna provided in the embodiment of the present application includes the downtilt angle adjustment device of any of the above embodiments, and thus has the beneficial effects of the downtilt angle adjustment device of any of the above embodiments, which will not be described in detail here.

[0070] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device that includes the element.

[0071] The above are merely specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to these embodiments herein, but is intended to be construed in the broadest manner consistent with the principles and novel features disclosed herein.

Claims

1. A downtilt angle adjustment device, characterized in that: include: Bracket (1); A phase shift assembly (2) comprises a screw (21) and a nut (22), wherein the nut (22) is sleeved on the outside of the screw (21) and is threadably engaged with the screw (21), the nut (22) is rotatably connected to the bracket (1), and a gear structure (221) is formed on the outer side of the nut (22); A switching assembly (3), comprising a transmission gear (31) and a transmission rack (32); The transmission gear (31) is rotatably connected to the bracket (1) and driven to rotate by a first driving mechanism (4); an elastic member (33) is provided between the transmission gear (31) and the bracket (1); A cam (321) is provided on the transmission rack (32), and the transmission rack (32) is driven to move by a second driving mechanism (5) to drive the cam (321) to abut or release the abutment with the transmission gear (31); The transmission gear (31) is configured to move relative to the bracket (1) toward the nut (22) and engage with the gear structure (221) when the cam (321) abuts, and to move relative to the bracket (1) away from the nut (22) through the elastic member (33) and disengage from the gear structure (221) when the cam (321) is released from abutment.

2. The downtilt angle adjustment device according to claim 1, characterized in that: The phase shifting components (2) and the transmission gears (31) are both multiple in number and are arranged in a one-to-one correspondence, and the cam (321) can be switchably abutted against one of the multiple transmission gears (31); The plurality of phase shifting components (2) are sequentially spaced apart along a first direction, and the plurality of transmission gears (31) are sequentially spaced apart along a second direction, and the first direction is arranged in parallel with the second direction.

3. The downtilt angle adjustment device according to claim 2, characterized in that: The transmission gear (31) is rotatably connected to the bracket (1) via a first rotating shaft (34), and a first bevel gear (341) is also provided on the first rotating shaft (34); The first driving mechanism (4) comprises a first driving member and a transmission shaft (41); the output end of the first driving member is connected to a second bevel gear (42); a third bevel gear (411) and a plurality of fourth bevel gears (412) are provided on the transmission shaft (41); the third bevel gear (411) is meshed with the second bevel gear (42) for transmission, and the plurality of fourth bevel gears (412) are meshed with the plurality of first bevel gears (341) for transmission one by one.

4. The downtilt angle adjustment device according to claim 3, characterized in that: The transmission gear (31) is slidably engaged with the first rotating shaft (34) along the axial direction of the first rotating shaft (34).

5. The downtilt angle adjustment device according to claim 4, characterized in that: A first limiting surface (342) is formed on the first rotating shaft (34), and the first limiting surface (342) is extended along the axial direction of the first rotating shaft (34); A through hole is provided at the center of the transmission gear (31), a first mating surface (311) is formed on the inner wall surface of the through hole, the first rotating shaft (34) is inserted into the through hole, and the first limiting surface (342) and the first mating surface (311) are positioned and abutted against each other.

6. The downtilt angle adjustment device according to claim 2, characterized in that: The second driving mechanism (5) comprises a second driving member and a driving gear (51) connected to the second driving member, the driving gear (51) meshes with the transmission rack (32) for transmission, and the transmission rack (32) moves along the arrangement direction of the transmission gear (31).

7. The downtilt angle adjustment device according to any one of claims 1 to 6, characterized in that: A first stop block (211) is provided on the screw rod (21), and a second stop block (222) is provided on the nut (22). The phase shift assembly (2) is configured to have a zero position and a phase shift position. When the phase shift assembly (2) is at the zero position, the first stop block (211) and the second stop block (222) abut against each other.

8. The downtilt angle adjustment device according to any one of claims 1 to 6, characterized in that: An anti-rotation hole (11) is provided on the bracket (1), a second limiting surface (212) is formed on the screw rod (21), a second matching surface is formed on the inner wall surface of the anti-rotation hole (11), the screw rod (21) is inserted into the anti-rotation hole (11), and the second limiting surface (212) and the second matching surface are positioned and abutted against each other.

9. The downtilt angle adjustment device according to any one of claims 1 to 6, characterized in that: The bracket (1) is provided with a receiving groove (12), the notch of the receiving groove (12) is arranged toward the transmission gear (31), and the elastic member (33) elastically abuts between the bottom wall of the receiving groove (12) and the transmission gear (31).

10. A base station antenna, characterized in that: The invention comprises a phase shifter and the downtilt angle adjustment device according to any one of claims 1 to 9, wherein the screw (21) of the downtilt angle adjustment device is configured to adjust the phase of the phase shifter.

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