Downtilt angle display mechanism and base station antenna

Abstract

The present application relates to a downtilt angle display mechanism and a base station antenna, comprising an end cover, the end cover being provided with at least two different numbers arranged in a circumferential direction, each number being used to correspond to a phase shifter rod setting; a turntable, the turntable being rotatably provided on the end cover, the turntable being provided with an indicator portion, the indicator portion being used to indicate any one of the numbers; a display sleeve, the display sleeve being assembled with the turntable and being capable of rotating synchronously with the turntable; and a ruler, the ruler being provided through the display sleeve and being capable of driving the display sleeve to rotate synchronously, and the ruler being capable of axially moving relative to the display sleeve, the ruler having an actuating portion and an abutting portion respectively extending out of two opposite side surfaces of the end cover, the abutting portion being used to abut and cooperate with any one of the phase shifter rods.

Description

Technical Field

[0001] The present application relates to the technical field of communication equipment, and in particular to a downtilt angle display mechanism and a base station antenna. Background Art

[0002] Antenna downtilt refers to the angle between the antenna and the vertical. In mobile communication networks, antenna downtilt is used to adjust the antenna's orientation to optimize signal coverage and reduce interference between adjacent base stations. Antenna downtilt can be adjusted mechanically or electronically. Mechanical downtilt is achieved by changing the physical position of the antenna, while electronic downtilt is achieved by adjusting the phase of the antenna feed network.

[0003] In related technologies, antenna frequency bands use scales to display downtilt angles, and multiple frequency bands often require multiple corresponding scales to display the downtilt angles respectively. On the one hand, the large number of scales increases the difficulty of layout of the scales on the antenna end cover. On the other hand, the large number of scales used will also occupy more installation space, increasing the space occupied inside the antenna and the difficulty of space layout. Summary of the Invention

[0004] Based on this, it is necessary to provide a downtilt angle display mechanism and a base station antenna to address the problems of the existing technology in that the end cover layout is difficult, occupies a large installation space, and affects the internal space layout of the antenna.

[0005] In a first aspect of the present application, a downtilt angle display mechanism is provided, comprising:

[0006] An end cap, wherein the end cap is provided with at least two different numbers arranged along the circumferential direction, each number being used to correspond to a phase shifter pull rod;

[0007] a turntable, the turntable being rotatably disposed on the end cover, the turntable being provided with an indicator portion, the indicator portion being used to indicate any one of the numbers;

[0008] A display sleeve, the display sleeve is assembled with the turntable and can rotate synchronously with the turntable; and

[0009] A ruler is provided in the display sleeve and can drive the display sleeve to rotate synchronously, and the ruler can move axially relative to the display sleeve. The ruler has an actuating portion and an abutting portion respectively extending from two opposite sides of the end cover, and the abutting portion is used to abut and cooperate with any one of the phase shifter rods.

[0010] The downtilt angle display mechanism of the present invention is applied to a base station antenna and is used to work in combination with at least two phase shifters to display the downtilt angle value of each phase shifter. Specifically, when installed and used, a phase shifter is arranged in the axial direction of each number of the end cap. When the operating actuator drives the scale to rotate, thereby driving the display sleeve and the turntable to rotate synchronously, the turntable rotates so that the indicator part aligns with the different numbers, indicating that the abutment part of the scale is now axially aligned with the phase shifter corresponding to the current number. On this basis, the scale is further pulled outward until the abutment part contacts the phase shifter pull rod of the currently aligned phase shifter, and the scale stops moving. At this time, the scale is aligned with the scale mark on the scale with the help of the display sleeve. The current downtilt angle value of the phase shifter can be obtained. (It should be noted that when each phase shifter operates at a different downtilt angle value, the distance between each phase shifter and the end cap is also different, resulting in different outward movement distances of the scale and different scale readings.) Compared with the existing technology, this solution uses only one downtilt angle display mechanism that can be simultaneously assembled with at least two phase shifters. The downtilt angle value of each phase shifter can be obtained simply by rotating and pulling the scale. This greatly simplifies the structural composition and complexity, reduces the number of components such as the scale, and reduces the difficulty of end cap layout while also reducing the space occupied by the antenna interior and the layout difficulty of the antenna interior.

[0011] The technical solution of this application is further described below:

[0012] In one embodiment, the abutting portion includes an abutting cap mounted on an end portion of the scale, and the abutting cap is provided with an abutting protrusion protruding from an outer wall of the scale.

[0013] In one embodiment, the outer wall of the ruler is provided with at least one stop surface, and the inner wall of the display sleeve is provided with at least one stop mating surface, and the stop surface is engaged with the stop mating surface to limit the relative rotation of the ruler and the display sleeve.

[0014] In one embodiment, one of the turntable and the display sleeve is provided with a bayonet, and the other of the turntable and the display sleeve is provided with a latch, and the latch is engaged with the bayonet to limit the relative rotation of the turntable and the display sleeve.

[0015] In one embodiment, the dip angle display mechanism further includes a support base, and the scale is rotatably disposed on the support base.

[0016] In one embodiment, the dip angle display mechanism further includes a rotating sleeve, which is rotatably inserted into the support seat, and the scale is axially movably inserted into the rotating sleeve. A strip through groove is provided on the side wall of the rotating sleeve, and the strip through groove extends along the axial direction of the rotating sleeve. The abutment portion extends into the strip through groove and can slide along the strip through groove.

[0017] In one embodiment, the rotating sleeve includes a sleeve and a sleeve cover, the sleeve cover is detachably mounted on the open end of the sleeve, the strip-shaped through-slot is formed on the sleeve, and one end of the strip-shaped through-slot located at the open end of the sleeve is open, while the other end of the strip-shaped through-slot away from the open end of the sleeve is closed;

[0018] A card slot is provided at one of the open end of the sleeve and the cover, and a card body is provided at the other of the open end of the sleeve and the cover, and the card body is snap-connected to the card slot.

[0019] In one embodiment, the dip angle display mechanism further includes an elastic member, which is installed between the scale and the rotating sleeve, and one end of the elastic member abuts against the abutting portion, and the other end of the elastic member abuts against the sleeve cover.

[0020] In one embodiment, the display sleeve is recessed with an assembly groove, and at least a portion of the sleeve cover is inserted into the assembly groove.

[0021] In one embodiment, the end cover is provided with a through hole, the turntable is provided with a step portion, and the turntable is rotatably inserted into the through hole through the step portion.

[0022] In one embodiment, the turntable is recessed with a receiving groove, and at least a portion of the display sleeve is inserted into the receiving groove.

[0023] In a second aspect of the present application, a base station antenna is further provided, comprising:

[0024] A downtilt angle display mechanism as described above;

[0025] At least two phase shifters, each of which has a phase shifter rod, at least two of which are circumferentially arranged around the outer periphery of the scale, each of which is provided with a positioning protrusion, and the abutment portion is used to axially abut against any one of the positioning protrusions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings that constitute a part of this application are used to provide further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute improper limitations on this application.

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

[0028] Figure 1 Schematic diagram of the structure of the downtilt angle display mechanism according to one embodiment.

[0029] Figure 2 for Figure 1 A structural diagram from another perspective.

[0030] Figure 3 FIG. 1 is a structural diagram of an assembly of a downtilt angle display mechanism and three phase shifter rods according to an embodiment.

[0031] Figure 4 for Figure 3 Schematic diagram of the structure of the rear view perspective.

[0032] Figure 5 for Figure 3 Schematic diagram of the structure from the right view perspective.

[0033] Figure 6 for Figure 3 Exploded structure diagram.

[0034] Figure 7 for Figure 3 Another perspective of the exploded structure diagram.

[0035] Description of reference numerals:

[0036] 100. Downtilt angle display mechanism; 10. End cover; 11. Number; 12. Through hole; 20. Turntable; 21. Indicator; 22. Clamping protrusion; 23. Step portion; 24. Receiving groove; 30. Display sleeve; 31. Stopping mating surface; 32. Bayonet; 33. Assembly groove; 40. Scale; 41. Actuating portion; 42. Abutting sleeve; 421. Abutting protrusion; 43. Stop surface; 50. Support seat; 60. Rotating sleeve; 61. Sleeve; 611. Strip through groove; 612. Clamping slot; 62. Sleeve cover; 621. Card body; 70. Elastic member; 200. Phase shifter pull rod; 210. Positioning ridge. DETAILED DESCRIPTION

[0037] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0038] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply 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 this application.

[0039] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0040] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0041] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0042] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0043] The present application provides a base station antenna, which includes a downtilt angle display mechanism 100 and at least two phase shifters, each of which has a phase shifter pull rod 200. Figure 1 and Figure 2 , which is a dip angle display mechanism 100 shown in one embodiment of the present application, includes an end cover 10, a turntable 20, a display sleeve 30 and a ruler 40.

[0044] The end cover 10 is provided with at least two different numbers 11 arranged along the circumferential direction, and each number 11 is used to correspond to a phase shifter rod 200 .

[0045] Optionally, the number 11 can be any one of Arabic numerals, English letters, geometric figures, etc., which can be selected according to actual needs. For example, the number 11 in this application is Arabic numerals, namely 1, 2 and 3 marked on the surface of the end cap 10.

[0046] Please continue reading Figure 3 and Figure 4 Accordingly, the present application shows an embodiment in which three phase shifter rods 200 are configured simultaneously. That is, one phase shifter rod 200 is disposed on each side of the axial direction numbered 11.

[0047] In particular, the side surface numbered 11 on the end cover 10 is defined as the outer side surface to facilitate the operator to intuitively observe the number 11, and the side surface of the end cover 10 away from the outer side surface numbered 11 is defined as the inner side surface, and the phase shifter rod 200 is used to be installed inside the inner side surface.

[0048] The turntable 20 is rotatably disposed on the end cover 10. The turntable 20 is provided with an indicator 21. The indicator 21 is used to indicate any number 11. For example, the indicator 21 is a triangular arrow, which is simple and intuitive.

[0049] The display sleeve 30 is assembled with the turntable 20 and can rotate synchronously with the turntable 20; the scale 40 is disposed through the display sleeve 30 and can drive the display sleeve 30 to rotate synchronously, and the scale 40 can move axially relative to the display sleeve 30. The scale 40 has an actuating portion 41 and an abutting portion that extend out of two opposite side surfaces of the end cover 10 respectively, and the abutting portion is used to abut and cooperate with any phase shifter rod 200.

[0050] like Figure 5 As shown, at least two phase shifter rods 200 are circumferentially arranged around the outer periphery of the scale 40 . The phase shifter rods 200 are provided with positioning protrusions 210 , and the abutting portion is used to axially abut against any one of the positioning protrusions 210 .

[0051] It is necessary to point out that when each phase shifter is operating at a different downtilt angle value, the distance between each phase shifter and the end cover 10 is also different, so that when the abutment portion and the positioning protrusion 210 are axially abutted, the outward movement stroke of each scale 40 is different, and the scale reading of the scale 40 is also different.

[0052] In summary, the implementation of the technical solution of this embodiment has the following beneficial effects: the downtilt angle display mechanism 100 of this solution is applied to a base station antenna and is configured to work in conjunction with at least two phase shifters to display the downtilt angle value of each phase shifter. Specifically, during installation and use, a phase shifter is arranged in the axial direction of each number 11 of the end cap 10. When the operating actuator 41 drives the scale 40 to rotate, thereby driving the display sleeve 30 and the turntable 20 to rotate synchronously, the turntable 20 rotates so that the indicator portion 21 aligns with a different number 11, indicating that the abutment portion of the scale 40 is now axially aligned with the phase shifter corresponding to the current number 11. On this basis, the scale 40 is further pulled outward until the abutment portion contacts the phase shifter pull rod 200 of the currently aligned phase shifter, and the scale 40 stops moving. At this time, the downtilt angle value of the current phase shifter can be obtained by aligning the display sleeve 30 with the scale line on the scale 40.

[0053] Compared to the prior art, this solution utilizes only one downtilt angle display mechanism 100 that can be simultaneously assembled with at least two phase shifters. The downtilt angle value of each phase shifter can be obtained simply by rotating and pulling the scale 40. This greatly simplifies the structural composition and complexity, reduces the number of components such as the scale 40, and reduces the difficulty of arranging the end cap 10 while also reducing the space occupied by the antenna interior and the difficulty of arranging the antenna interior.

[0054] Please continue reading Figure 6 and Figure 7 In one embodiment, the end cap 10 defines a through hole 12, and the turntable 20 defines a step 23. The turntable 20 is rotatably inserted into the through hole 12 via the step 23. The circumferential wall of the through hole 12 and the step 23 rotate in conjunction, not only improving the assembly stability of the turntable 20 and the end cap 10, but also guiding and limiting the rotation of the turntable 20, thereby improving the smooth rotation of the turntable 20.

[0055] To ensure that rotating the scale 40 synchronously drives the display sleeve 30 and the turntable 20, in one embodiment, the outer wall of the scale 40 is provided with at least one stop surface 43, and the inner wall of the display sleeve 30 is provided with at least one stop mating surface 31. The stop surface 43 engages with the stop mating surface 31 to limit relative rotation of the scale 40 and the display sleeve 30. One of the turntable 20 and the display sleeve 30 is provided with a bayonet 32, and the other of the turntable 20 and the display sleeve 30 is provided with a latching protrusion 22. The latching protrusion 22 engages with the bayonet 32 ​​to limit relative rotation of the turntable 20 and the display sleeve 30.

[0056] For example, in this embodiment, the scale 40 is a rod with a rectangular cross-section. A stop surface 43 is formed on one outer side of the scale 40. Accordingly, the display sleeve 30 has a rectangular mounting hole 12, and the stop mating surface 31 is formed on one side of the rectangular hole. The scale 40 is inserted into the mounting hole 12 of the display sleeve 30, forming four sets of interlocking stop surfaces 43 and stop mating surfaces 31 in the circumferential direction. This ensures that the scale 40 and display sleeve 30 are securely assembled and can rotate synchronously.

[0057] Of course, in other embodiments, the scale 40 and the mounting through hole 12 may also have other shapes and structures, which can be flexibly selected according to actual needs.

[0058] The turntable 20 and the display sleeve 30 are fixed by the clamping protrusion 22 and the clamping socket 32, so that the purpose of limiting the relative rotational freedom of the two is achieved by a simple assembly structure, and the feasibility is strong.

[0059] Of course, in other embodiments, the turntable 20 and the display sleeve 30 may also be assembled and fixed by at least one of bonding, magnetic connection, riveting, etc. instead of the above-mentioned snap-fit ​​fixing method.

[0060] Furthermore, in one embodiment, the abutting portion includes an abutting cap mounted on an end portion of the scale 40 , and the abutting cap is provided with an abutting protrusion 421 protruding from an outer wall of the scale 40 .

[0061] Please continue reading Figure 5By forming an abutting protrusion 421 on the abutting cap that protrudes from the outer wall of the scale 40, the abutting protrusion 421 can overlap with the axial projection of the positioning protrusion 210 on each phase shifter pull rod 200. This ensures that when the scale 40 is pulled outward, the abutting protrusion 421 can abut against the positioning protrusion 210, thereby pulling and positioning the scale 40. At this time, the alignment of the display sleeve 30 with the scale on the scale 40 represents the corresponding downtilt angle value of the phase shifter.

[0062] In the present application, the abutment cap can be integrally formed with the scale 40, or it can be detachably assembled with the scale 40. For example, the abutment cap is a separate component and is provided with a latching hole. The end of the scale 40 has at least two elastic latching hooks spaced apart along the circumference. When inserted into the latching hole, the at least two elastic latching hooks will gather, shrink, and deform until they are fully engaged. With the help of the resilience of the elastic latching hooks and the hook connection with the abutment cap, the scale 40 and the abutment cap can be assembled and fixed, providing the required strength for the abutment protrusion 421 to engage with the positioning protrusion 210. In addition, the abutment cap is detachable, thereby facilitating its use with different scales 40.

[0063] In addition, based on any of the above embodiments, the dip angle display mechanism 100 further includes a support base 50, and the scale 40 is rotatably mounted on the support base 50. The support base 50 provides rotational support for the scale 40 and improves the installation stability of the entire dip angle display mechanism 100.

[0064] Specifically, a through hole is provided on the upper portion of the support base 50 for the scale 40 to pass through and rotate supported by the hole wall. A hole is provided on the bottom of the support base 50 for convenient insertion of a threaded component for locking and fixing.

[0065] Please continue reading Figure 1 , Figure 2 , Figure 6 and Figure 7 In another embodiment, the dip angle display mechanism 100 further includes a rotating sleeve 60, which is rotatably inserted into the support seat 50, and the scale 40 is axially movably inserted into the rotating sleeve 60. The side wall of the rotating sleeve 60 is provided with a strip-shaped through groove 611, which extends along the axial direction of the rotating sleeve 60, and the abutment portion extends into the strip-shaped through groove 611 and can slide along the strip-shaped through groove 611.

[0066] Considering that if the scale 40 has a non-circular cross-section and is not suitable for direct rotational installation, the scale 40 is first installed in the rotating sleeve 60. After the rotating sleeve 60 is assembled with the support base 50, the rotating sleeve 60 can be used to smoothly rotate relative to the support base 50, meeting the uniform use requirements of the scale 40. It also avoids the scale 40 being directly rotated with the support base 50, which increases wear on the scale 40 and shortens its service life.

[0067] In addition, since the rotating sleeve 60 is provided with a strip-shaped through-slot 611, when the scale 40 moves axially, the abutting protrusion 421 can slide along the strip-shaped through-slot 611 and be guided and limited by the groove wall of the strip-shaped through-slot 611, thereby helping to improve the smoothness of the movement of the scale 40. At the same time, it can also prevent the scale 40 from accidentally rotating and deviating, causing the abutting protrusion to be unable to effectively abut against the selected target phase shifter rod 200.

[0068] Furthermore, in the present application, the rotating sleeve 60 includes a sleeve 61 and a sleeve cover 62, the sleeve cover 62 is detachably arranged at the open end of the sleeve 61, a strip-shaped through groove 611 is formed on the sleeve 61, and the end of the strip-shaped through groove 611 located at the open end of the sleeve 61 is open, and the end of the strip-shaped through groove 611 away from the open end of the sleeve 61 is closed.

[0069] A locking groove 612 is defined between the open end of the sleeve 61 and the cover 62 , and a locking body 621 is defined between the open end of the sleeve 61 and the cover 62 . The locking body 621 is connected to the locking groove 612 by snapping.

[0070] The cover 62 is assembled with the sleeve 61 through the snap-fit ​​structure of the card body 621 and the card slot 612, ensuring sufficient connection strength while facilitating disassembly. The abutment protrusion can be pulled out from the open end of the strip groove 611 or inserted into the strip groove 611, making it convenient to disassemble or assemble the scale 40 and the rotating sleeve 60.

[0071] In addition, based on any of the above embodiments, the inclination angle display mechanism 100 also includes an elastic member 70, which is installed between the scale 40 and the rotating sleeve 60, and one end of the elastic member 70 abuts against the abutting portion, and the other end of the elastic member 70 abuts against the sleeve cover 62.

[0072] When the scale 40 is pulled outward to obtain the selected phase shifter downtilt angle value, the elastic member 70 is squeezed by the abutment protrusion and is in a compressed state. At this time, when the scale 40 is released, the elastic member 70 releases the elastic force, and the scale 40 will automatically retract and reset, thereby facilitating the next operation.

[0073] For example, the elastic member 70 is a spring, which is sleeved on the outside of the scale 40, and is reliably installed and smoothly deformed.

[0074] Of course, in other embodiments, the elastic member 70 may also be any one of a spring sheet, an elastic column, etc.

[0075] In another embodiment, the display sleeve 30 is recessed with an assembly groove 33, and at least a portion of the cover 62 is inserted into the assembly groove 33. Furthermore, the turntable 20 is recessed with a receiving groove 24, and at least a portion of the display sleeve 30 is inserted into the receiving groove 24.

[0076] After such assembly, on the one hand, the assembly of the display sleeve 30 and the sleeve cover 62 as well as the turntable 20 and the display sleeve 30 can be made more firm and reliable, and on the other hand, the overall volume after assembly can be further reduced, thereby reducing the space occupied by the antenna and reducing the difficulty of layout of the antenna internal space.

[0077] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0078] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A downtilt angle display mechanism, characterized in that: include: An end cap, wherein the end cap is provided with at least two different numbers arranged along the circumferential direction, each number being used to correspond to a phase shifter pull rod; a turntable, the turntable being rotatably disposed on the end cover, the turntable being provided with an indicator portion, the indicator portion being used to indicate any one of the numbers; A display sleeve, the display sleeve is assembled with the turntable and can rotate synchronously with the turntable; and A ruler is provided in the display sleeve and can drive the display sleeve to rotate synchronously, and the ruler can move axially relative to the display sleeve. The ruler has an actuating portion and an abutting portion respectively extending from two opposite sides of the end cover, and the abutting portion is used to abut and cooperate with any one of the phase shifter rods.

2. The downtilt angle display mechanism according to claim 1, characterized in that: The abutting portion includes an abutting cap mounted on the end of the scale, and the abutting cap is provided with an abutting protrusion protruding from the outer wall of the scale.

3. The downtilt angle display mechanism according to claim 1, characterized in that: The outer wall of the ruler is provided with at least one stop surface, and the inner wall of the display sleeve is provided with at least one stop matching surface, and the stop surface is engaged with the stop matching surface to limit the relative rotation of the ruler and the display sleeve.

4. The dip angle display mechanism according to claim 1, characterized in that: One of the turntable and the display sleeve is provided with a bayonet, and the other of the turntable and the display sleeve is provided with a locking protrusion, and the locking protrusion is engaged with the bayonet to limit the relative rotation of the turntable and the display sleeve.

5. The downtilt angle display mechanism according to claim 1, characterized in that: The dip angle display mechanism further includes a support base, and the scale is rotatably disposed on the support base.

6. The downtilt angle display mechanism according to claim 5, characterized in that: The downward inclination angle display mechanism also includes a rotating sleeve, which is rotatably inserted into the support seat, and the scale is axially movably inserted into the rotating sleeve. The side wall of the rotating sleeve is provided with a strip through groove, and the strip through groove extends along the axial direction of the rotating sleeve. The abutment portion extends into the strip through groove and can slide along the strip through groove.

7. The downtilt angle display mechanism according to claim 6, characterized in that: The rotating sleeve includes a sleeve and a sleeve cover, wherein the sleeve cover is detachably arranged at the open end of the sleeve, and the strip-shaped through-slot is formed on the sleeve, and the end of the strip-shaped through-slot located at the open end of the sleeve is open, and the end of the strip-shaped through-slot away from the open end of the sleeve is closed; A card slot is provided at one of the open end of the sleeve and the cover, and a card body is provided at the other of the open end of the sleeve and the cover, and the card body is snap-connected to the card slot.

8. The downtilt angle display mechanism according to claim 7, characterized in that: The downward inclination angle display mechanism further includes an elastic member, which is installed between the scale and the rotating sleeve, and one end of the elastic member abuts against the abutting portion, and the other end of the elastic member abuts against the sleeve cover.

9. The dip angle display mechanism according to claim 7, characterized in that: The display sleeve is concavely provided with an assembly groove, and at least a portion of the sleeve cover is inserted into the assembly groove.

10. The dip angle display mechanism according to claim 1, characterized in that: The end cover is provided with a through hole, and the turntable is provided with a step portion. The turntable is rotatably inserted into the through hole through the step portion.

11. The downtilt angle display mechanism according to claim 1, characterized in that: The turntable is recessed with a receiving groove, and at least a portion of the display sleeve is inserted into the receiving groove.

12. A base station antenna, characterized in that: include: The downtilt angle display mechanism according to any one of claims 1 to 11; At least two phase shifters, each of which has a phase shifter rod, at least two of which are circumferentially arranged around the outer periphery of the scale, each of which is provided with a positioning protrusion, and the abutment portion is used to axially abut against any one of the positioning protrusions.

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