Antenna Rotation Adjustment Mechanism and Antenna Assembly

Abstract

The present disclosure relates to an antenna rotation adjustment mechanism and an antenna assembly. The adjustment mechanism includes a first connecting assembly and a second connecting assembly respectively connected between the antenna and a fixed base member. The first connecting assembly has a retractable first drive assembly, one end of the first drive assembly is used to connect to the antenna, the other end of the first drive assembly is used to connect to the fixed base member, and the second connecting assembly is used to be rotatably connected to the antenna to rotate the antenna in a vertical plane relative to the fixed base member. The first connecting assembly and / or the second connecting assembly also have a second drive assembly, the second drive assembly is used to connect to the antenna and is rotatably connected to the first connecting assembly and / or the second connecting assembly to rotate the antenna in a horizontal plane relative to the fixed base member. The antenna rotation adjustment mechanism and antenna assembly provided by the present disclosure adjust the antenna radiation angle by forming a four-bar linkage structure with the first drive assembly and the second drive assembly, ensuring reliable connection and reducing structural costs.

Description

Technical Field

[0001] The present disclosure relates to the technical field of communication antennas, and in particular to an antenna rotation adjustment mechanism and an antenna assembly. Background Art

[0002] As a communication device for transmitting signals, the antenna needs to be installed in a relatively open area that can cover a larger range. However, due to its fixed orientation, there will still be coverage blind spots. Therefore, it needs to be adjusted during use so that it can be moved to a more suitable or required area or direction.

[0003] Currently, most devices used to adjust the antenna azimuth can only adjust the horizontal azimuth or only adjust the downtilt angle. There are relatively few devices that have both horizontal azimuth and downtilt angle adjustment functions. In addition, the internal structure of the devices that can currently have these two functions is relatively complex, resulting in high costs and is not conducive to overall promotion and use. Summary of the Invention

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides an antenna rotation adjustment mechanism and an antenna assembly.

[0005] In a first aspect, the present disclosure provides an antenna rotation adjustment mechanism, comprising a first connecting component and a second connecting component respectively connected between an antenna and a fixed base member;

[0006] The first connecting assembly has a retractable first driving assembly, one end of the first driving assembly is used to connect to the antenna, the other end of the first driving assembly is used to connect to the fixed base member, and the second connecting assembly is used to be rotatably connected to the antenna to enable the antenna to rotate relative to the fixed base member in a vertical plane;

[0007] The first connecting component and / or the second connecting component also has a second driving component, which is used to connect to the antenna and is rotatably connected to the first connecting component and / or the second connecting component so that the antenna rotates relative to the fixed base in a transverse plane.

[0008] Optionally, the second driving component is arranged on the first connecting component, one end of the second driving component is used to connect to the fixed base, the other end of the second driving component is connected to one end of the first driving component, and the other end of the first driving component is used to connect to the antenna.

[0009] Optionally, the first driving assembly includes a swing arm group, the swing arm group includes at least two swing arms, and two adjacent swing arms are rotationally connected;

[0010] The swing arms at both ends of the swing arm group are respectively used to be hinged to the antenna and the fixed base, or the swing arms at both ends of the swing arm group are respectively used to be hinged to the antenna and the second driving assembly.

[0011] Optionally, the first driving assembly further includes a driving push rod, both ends of which are respectively connected to two adjacent swing arms to drive relative rotation between the two adjacent swing arms, so that one side of the antenna moves closer to or farther away from the fixed base.

[0012] Optionally, the second driving component includes a main body, a driving mechanism and a transmission member, the main body is used to connect with the fixed base member, the driving mechanism and the transmission member are both arranged on the main body, the transmission member is rotatably connected to the main body, and the rotating shaft of the transmission member is used to connect the first driving component or the antenna, the driving mechanism is connected to the transmission member, so that the driving mechanism drives the transmission member to drive the antenna to rotate relative to the fixed base member in a transverse plane.

[0013] Optionally, the driving mechanism includes a driving motor and a screw, wherein the driving motor is connected to one end of the screw to drive the screw to rotate;

[0014] The transmission member is rotationally connected to the main body via the rotating shaft, and the other end of the transmission member is movably connected to the surface of the screw, so that when the screw rotates, the other end of the transmission member is driven to move along the axial direction of the screw, so that the transmission member rotates relative to the main body.

[0015] Optionally, the driving mechanism also includes a transmission gear set, which has at least two mutually meshing transmission gears, wherein the two transmission gears are coaxially arranged at the end of the screw and the end of the rotating shaft of the driving motor, so that the torque of the driving motor is transmitted to the screw through the transmission gear set.

[0016] Optionally, the main body is further provided with a guide rod parallel to the screw rod, and the other end of the transmission member is provided with a connecting member, and the connecting member is sleeved on the surface of the guide rod and the screw rod;

[0017] The other end surface of the transmission member is provided with a strip-shaped hole, and one side of the connecting member is located in the strip-shaped hole and is slidable relative to the extending direction of the strip-shaped hole.

[0018] Optionally, the antenna rotation adjustment mechanism further includes an antenna connection component, wherein the antenna connection component is mounted on one side of the antenna, and the first connection component and the second connection component are both rotationally connected to the antenna connection component.

[0019] In a second aspect, the present disclosure further provides an antenna assembly, which includes an antenna, a fixed base, and the antenna rotation adjustment mechanism as described above, wherein the antenna rotation adjustment mechanism is disposed between the antenna and the fixed base.

[0020] The technical solution provided by the embodiments of the present disclosure has the following advantages over the prior art:

[0021] The antenna rotation adjustment mechanism and antenna assembly provided by the present invention connect the antenna and the fixed base member by using a first connecting assembly and a second connecting assembly, and the first connecting assembly carries a first drive assembly that can be extended and retracted. When the second connecting assembly is hinged to the antenna, the extension and retraction of the first drive assembly can push one end of the antenna closer to or farther away from the fixed base member, thereby realizing rotation in the vertical direction, that is, changing the downtilt angle of the antenna. In addition, a second drive assembly is also provided on the first connecting assembly or the second connecting assembly to realize horizontal rotation of the antenna, so that the radiation angle can be changed by adjusting the horizontal and vertical directions of the antenna to expand the radiation range of the antenna. This combined structure forms a four-bar structure between the antenna and the fixed base member, ensuring reliable connection during movement. The use status of the antenna can be flexibly adjusted in conjunction with the control software, reducing structural costs and being more economical. It also realizes the rotation of heavier objects through a smaller power drive member. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0023] In order to more clearly illustrate the embodiments of the present disclosure 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.

[0024] Figure 1 This is a schematic structural diagram of the antenna assembly according to an embodiment of the present disclosure;

[0025] Figure 2 This is a schematic structural diagram of the antenna assembly according to an embodiment of the present disclosure when the vertical direction is 0 degrees;

[0026] Figure 3 This is a structural schematic diagram of the antenna assembly according to an embodiment of the present disclosure when tilted downward by a certain angle in the vertical direction;

[0027] Figure 4 This is a schematic top view of the antenna assembly according to an embodiment of the present disclosure when the horizontal direction is 0 degrees;

[0028] Figure 5 This is a schematic top view of the antenna assembly according to an embodiment of the present disclosure when it is rotated by a certain angle in the horizontal direction;

[0029] Figure 6 This is a structural diagram of the first connection component according to an embodiment of the present disclosure;

[0030] Figure 7 This is a schematic structural diagram of the second drive assembly according to an embodiment of the present disclosure;

[0031] Figure 8 This is a schematic diagram of the internal structure of the second drive assembly according to an embodiment of the present disclosure;

[0032] Figure 9 This is a schematic structural diagram of the second connection component described in an embodiment of the present disclosure.

[0033] Among them, 1. antenna; 2. fixed base; 3. first connecting component; 31. first driving component; 311. swing arm; 312. driving push rod; 32. second driving component; 321. main body; 322. driving mechanism; 3221. driving motor; 3222. screw; 3223. transmission gear set; 323. transmission member; 324. guide rod; 325. connecting member; 326. block; 4. second connecting component; 41. second connecting base; 42. second mounting member; 5. clamp structure; 6. antenna connecting component; 7. mainboard component connector; 8. adjustment hole. DETAILED DESCRIPTION

[0034] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features therein can be combined with each other in the absence of conflict.

[0035] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may 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 disclosure, rather than all of the embodiments.

[0036] Existing small base station antenna equipment is often only capable of horizontal azimuth adjustment or only capable of downtilt adjustment. There are relatively few devices that have both horizontal azimuth and downtilt adjustment functions. In addition, the internal structure of the equipment that can currently have both functions is relatively complex, resulting in high costs and is not conducive to overall promotion and use.

[0037] To address the above-mentioned drawbacks, the antenna rotation adjustment mechanism provided in this embodiment can achieve downtilt or rotation of a heavy antenna using relatively small mechanical equipment and low-power drive components, thereby reducing manufacturing costs while ensuring high transmission accuracy and small return clearance. Its structural configuration is as follows:

[0038] like Figure 1-9 As shown, this embodiment provides an antenna rotation adjustment mechanism and an antenna assembly, which includes an antenna 1, a fixed base 2, a first connecting component 3 and a second connecting component 4, wherein both ends of the first connecting component 3 and the second connecting component 4 are connected to the antenna 1 and the fixed base 2 respectively;

[0039] The first connecting component 3 has a retractable first driving component 31, the movable end of the first driving component 31 is connected to one side of the antenna 1, and the second connecting component 4 is hinged to one side of the antenna 1 to enable the antenna 1 to rotate relative to the fixed base 2 in a vertical plane;

[0040] The first connecting component 3 and / or the second connecting component 4 also has a second driving component 32, which is connected to the antenna 1 and is rotatably connected to the first connecting component 3 and / or the second connecting component 4 so that the antenna 1 rotates relative to the fixed base 2 in the transverse plane.

[0041] The first connecting assembly 3 is located at the top of the antenna 1, while the second connecting assembly 4 is located at the bottom. The second connecting assembly 4 is hinged to one side of the antenna 1. This allows the first drive assembly 31 to push the antenna 1 to change its downtilt angle, creating a rotation axis at the second connecting assembly 4, ensuring the proper rotation. During horizontal rotation, the rotation of the second drive assembly 32 relative to the connecting assembly effectively drives the antenna 1 to rotate relative to the connecting assembly, thereby changing the horizontal angle.

[0042] A clamp structure 5 is provided on the first connecting assembly 3 and the second connecting assembly 4. This clamp structure 5 secures the antenna to the fixed base member 2. The first connecting assembly 3 and the second connecting assembly 4 are fixed in position by tightening the connecting bolts of the clamp structure 5. The fixed position of the antenna 1 can also be adjusted by adjusting the connecting bolts. Furthermore, because the clamp structure and the drive assembly are both provided on the connecting assembly, replacing the antenna 1 does not affect the adjustment function of the rotation adjustment mechanism.

[0043] The fixing base 2 is typically a pole, and the antenna 1 is secured to the pole via a connecting assembly. Of course, the fixing base 2 can also be other structures, such as a wall. Furthermore, the horizontal and vertical planes described above are relative to the pole. The vertical plane is the plane along which the pole's axial direction and the antenna's axial direction coexist, while the horizontal plane is perpendicular to the vertical plane.

[0044] The antenna rotation adjustment mechanism also includes an antenna connection assembly 6, which is mounted on one side of the antenna 1. The first connection assembly 3 and the second connection assembly 4 are both hingedly connected to the antenna connection assembly 6. Specifically, the antenna connection assembly 6 can be fixed to the side of the antenna 1 using a connecting piece with a hinge mechanism, and the first connection assembly 3 and the second connection assembly 4 can be hingedly connected to the connecting piece.

[0045] The antenna rotation adjustment mechanism connects the antenna 1 and the fixed base 2 by using a first connecting component 3 and a second connecting component 4, and the first connecting component 3 carries a first retractable driving component 31. When the second connecting component 4 is hinged to the antenna 1, the retraction of the first driving component 31 can push one end of the antenna 1 closer to or farther away from the fixed base 2, thereby realizing rotation in the vertical direction, that is, changing the downward tilt angle of the antenna 1. In addition, a second driving component 32 is also provided on the first connecting component 3 or the second connecting component 4 to realize horizontal rotation of the antenna 1, so that the radiation angle can be changed by adjusting the horizontal and vertical directions of the antenna 1, thereby expanding the radiation range of the antenna 1. This combined structure forms a four-bar structure between the antenna 1 and the fixed base 2, ensuring reliable connection during movement. The use status of the antenna 1 can be flexibly adjusted in conjunction with the control software, reducing structural costs and being more economical. It also realizes the rotation of heavier objects through smaller power driving components.

[0046] Specifically, in this embodiment, the first connecting component 3 specifically includes the second drive component 32, and the two ends of the first drive component 31 are respectively connected to the second drive component 32 and one side of the antenna 1. Through this arrangement, when the second drive component 32 rotates, it drives the first drive component 31 to rotate together, avoiding the interaction between the second drive component 32 and the first drive component 31 when the second drive component 32 acts, thereby preventing damage to the structure. Moreover, such an arrangement enables the horizontal and downward movement to be carried out simultaneously without the two affecting each other. Of course, in other embodiments, the first drive component 31 and the second drive component 32 can also be respectively arranged on the first connecting component 3 and the second connecting component 4, as long as it is ensured that the two do not affect each other when they act separately.

[0047] When the second drive component 32 is arranged on the first connecting component 3 and the first drive component 31 is also connected to the second drive component 32, the second drive component 32 can be hinged to the side of the first drive component 31, and then hinged to one side of the antenna 1 to ensure the telescopic movement of the first drive component 31. The second drive component 32 does not need to be directly connected to the antenna 1, and the rotational movement can be transmitted through the first drive component 31.

[0048] On this basis, the second connecting component 4 includes a second connecting base 41 and a second mounting member 42 . The second connecting base 41 is used to connect to the fixing base 2 , and the second mounting member 42 is used to connect to the antenna 1 .

[0049] Furthermore, the first drive assembly 31 includes a swing arm group, and the swing arm group includes at least two swing arms 311. The swing arms 311 located at both ends of the swing arm group are respectively hinged to the antenna 1 and the fixed base 2, or respectively hinged to the antenna 1 and the second drive assembly 32, and the two adjacent swing arms 311 are hinged. According to the above arrangement, in this embodiment, the swing arms 311 at both ends of the swing arm group are respectively hinged to the antenna 1 and the second drive assembly 32. Furthermore, the number of swing arms 311 is set to two, and of course it can be adjusted as needed in other embodiments. In the process of the swing arms 311 rotating and opening and closing with each other, the distance between the side of the antenna 1 connected to the swing arm 311 and the first connecting assembly 3 will change. Since the second connecting assembly 4 is only hinged, when the distance changes, the downtilt angle of the antenna 1 will change.

[0050] On this basis, the first drive assembly 31 also includes a drive push rod 312, the ends of which are connected to two adjacent swing arms 311, driving the two adjacent swing arms 311 to rotate relative to each other, causing one side of the antenna 1 to move closer to or further away from the fixed base 2. The ends of the drive push rod 312 can be connected to the middle side walls of the two swing arms 311 and hingedly connected. This allows the drive push rod 312 to push the swing arms 311 to open and close, thereby achieving the up and down swinging of the antenna 1.

[0051] As for the second driving component 32, it includes a main body 321, a driving mechanism 322 and a transmission member 323. The main body 321 is connected to the fixed base 2. The driving mechanism 322 and the transmission member 323 are both arranged on the surface of the main body 321. The transmission member 323 is rotatably connected to the main body 321. The transmission member 323 is also connected to the antenna 1 so that the driving mechanism 322 drives the transmission member 323 to drive the antenna 1 to rotate relative to the fixed base 2 in the horizontal plane.

[0052] Furthermore, the drive mechanism 322 includes a drive motor 3221 and a screw 3222. The drive motor 3221 is connected to one end of the screw 3222 to drive the screw 3222 to rotate. One end of the transmission member 323 is connected to the main body 321 via a rotating shaft, and the other end of the transmission member 323 is movably connected to the surface of the screw 3222. When the screw 3222 rotates, it drives the other end of the transmission member 323 to move along the axial direction of the screw 3222, so that the transmission member 323 rotates relative to the main body 321. The transmission is achieved through the screw 3222, which has a simple structure and a small return clearance of the screw 3222 structure, which can make the transmission process more stable.

[0053] By changing the distance between the screw 3222 and the rotating shaft, the horizontal rotation virtual position of the antenna 1 can be greatly reduced, and a smaller power motor can be used to drive the rotation of a heavier antenna. Therefore, the distance between the screw 3222 and the rotating shaft can be flexibly adjusted according to actual usage requirements, thereby changing the transmission power required by the motor.

[0054] Since the space available on the main body 321 is relatively small, in the case where the rotating shaft of the drive motor 3221 and the screw 3222 are arranged in parallel, the drive mechanism 322 further includes a transmission gear set 3223, which is coaxially arranged at the end of the screw 3222 and the end of the rotating shaft of the drive motor 3221, so that the torque of the drive motor 3221 is transmitted to the screw 3222 via the transmission gear set 3223. The transmission gear set 3223 may include two intermeshing gears, which are coaxially connected to the end of the screw 3222 and the end of the rotating shaft of the drive motor 3221, respectively. Thus, the torque of the drive motor 3221 is transmitted to the screw 3222 via the two meshing gears, causing the screw 3222 to rotate synchronously, thereby driving the transmission member 323 connected to the surface of the screw 3222 to rotate.

[0055] The operating status of the drive motor 3221 and the drive push rod 312 of the first drive assembly 31 can be controlled by a control unit. The control unit can be set in a position where the operator can touch it, and then the drive motor 3221 and the drive push rod 312 are electrically connected to the control unit to achieve remote control. Specifically, a main board can be set inside the main body 321 of the second drive assembly 32 for signal acquisition and output. In addition, a main board assembly connector 7 can be set at the bottom of the main board for scanning the position of the antenna 1 during adjustment, thereby selecting the direction to be rotated and setting the angle to be rotated to achieve adjustment of the azimuth of the antenna 1.

[0056] On this basis, to ensure that only the axial translational motion of the screw 3222 is transmitted to the transmission member 323, a guide rod 324 is further provided on the main body 321 and is parallel to the screw 3222. A connector 325 is provided at the other end of the transmission member 323. The connector 325 is sleeved over the surfaces of the guide rod 324 and the screw 3222. The other end of the transmission member 323 has a strip-shaped hole. The connector 325 is located in the strip-shaped hole and is slidable relative to the direction of the strip-shaped hole. This arrangement allows the connector 325 to be further limited by the guide rod 324, thereby absorbing the helical motion and transmitting only the axial motion. The strip-shaped hole in the transmission member 323 provides space for the connector 325 to move, allowing the transmission member 323 to maintain its rotational operation under the push of the connector 325.

[0057] Stoppers 326 may be provided at both ends of the screw 3222 to lock the connector 325 during movement, thereby providing feedback of a starting point signal to achieve calibration.

[0058] To enable manual adjustment in special circumstances, such as when high-precision adjustment is required, when there is no power, or when the control system is damaged, this embodiment further provides an adjustment hole 8 on the side of the main body 321. An adjustment screw is disposed within the adjustment hole 8. The adjustment screw is rotatable relative to the adjustment hole 8, and the bottom end of the adjustment screw is fixedly connected to one end of the screw rod 3222. In other words, by turning the adjustment screw, the screw rod 3222 is rotated, thereby driving the transmission member 323 to rotate, thereby changing the orientation of the antenna 1.

[0059] 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 comprising 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 comprising the element.

[0060] The foregoing description is intended only to provide specific embodiments of the present disclosure, intended to enable those skilled in the art to understand and implement the present disclosure. 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 disclosure. Therefore, the present disclosure is not intended to be limited to the embodiments described herein, but rather to be construed in the broadest manner consistent with the principles and novel features disclosed herein.

Claims

1. An antenna rotation adjustment mechanism, characterized in that: comprising a first connecting component and a second connecting component respectively connected between the antenna and the fixed base member; The first connecting assembly has a retractable first driving assembly, one end of the first driving assembly is used to connect to the antenna, the other end of the first driving assembly is used to connect to the fixed base member, and the second connecting assembly is used to be rotatably connected to the antenna to enable the antenna to rotate relative to the fixed base member in a vertical plane; The first connecting component and / or the second connecting component further comprises a second driving component, the second driving component being configured to be connected to the antenna and being rotatably connected to the first connecting component and / or the second connecting component so as to rotate the antenna relative to the fixed base member in a transverse plane; The second drive assembly includes a main body, a drive mechanism, and a transmission member. The main body is used to connect to the fixed base member. The drive mechanism and the transmission member are both provided on the main body. The transmission member is rotationally connected to the main body. The rotating shaft of the transmission member is used to connect to the first drive assembly or the antenna. The drive mechanism is connected to the transmission member so that the drive mechanism drives the transmission member to rotate the antenna in a transverse plane relative to the fixed base member. The driving mechanism includes a driving motor and a screw, wherein the driving motor is connected to one end of the screw to drive the screw to rotate; The transmission member is rotatably connected to the main body via the rotating shaft, and the other end of the transmission member is movably connected to the surface of the screw, so that when the screw rotates, the other end of the transmission member is driven to move along the axial direction of the screw, so that the transmission member rotates relative to the main body; Stoppers are provided at both ends of the screw.

2. The antenna rotation adjustment mechanism according to claim 1, characterized in that: The second driving component is arranged on the first connecting component, one end of the second driving component is used to connect to the fixed base, the other end of the second driving component is connected to one end of the first driving component, and the other end of the first driving component is used to connect to the antenna.

3. The antenna rotation adjustment mechanism according to claim 1, characterized in that: The first driving assembly includes a swing arm group, the swing arm group includes at least two swing arms, and two adjacent swing arms are rotatably connected; The swing arms at both ends of the swing arm group are respectively used to be hinged to the antenna and the fixed base, or the swing arms at both ends of the swing arm group are respectively used to be hinged to the antenna and the second driving assembly.

4. The antenna rotation adjustment mechanism according to claim 3, characterized in that: The first driving assembly further includes a driving push rod, both ends of which are respectively connected to two adjacent swing arms to drive the two adjacent swing arms to rotate relative to each other, so that one side of the antenna moves closer to or farther away from the fixed base.

5. The antenna rotation adjustment mechanism according to claim 1, characterized in that: The driving mechanism also includes a transmission gear set, which has at least two transmission gears meshing with each other, wherein the two transmission gears are coaxially arranged at the end of the screw and the end of the rotating shaft of the driving motor, so that the torque of the driving motor is transmitted to the screw through the transmission gear set.

6. The antenna rotation adjustment mechanism according to claim 1, characterized in that: The main body is further provided with a guide rod parallel to the screw rod, and the other end of the transmission member is provided with a connecting member, which is sleeved on the surface of the guide rod and the screw rod; The other end surface of the transmission member is provided with a strip-shaped hole, and one side of the connecting member is located in the strip-shaped hole and is slidable relative to the extending direction of the strip-shaped hole.

7. The antenna rotation adjustment mechanism according to any one of claims 1 to 6, characterized in that: The antenna rotation adjustment mechanism further includes an antenna connection component, which is installed on one side of the antenna. The first connection component and the second connection component are both rotatably connected to the antenna connection component.

8. An antenna assembly, characterized in that: The invention comprises an antenna, a fixed base member and the antenna rotation adjustment mechanism according to any one of claims 1 to 7, wherein the antenna rotation adjustment mechanism is arranged between the antenna and the fixed base member.

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