Patent Publication Number: US-2022224007-A1

Title: Adjustment apparatus, multi-band antenna, and base station

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of International Application No. PCT/CN2019/109150, filed on Sep. 29, 2019, the disclosure of which is hereby incorporated in its entirety. 
    
    
     TECHNICAL FIELD 
     This application relates to the field of communications device technologies, and in particular, to an adjustment apparatus, a multi-band antenna, and a base station. 
     BACKGROUND 
     Cell signal coverage in mobile communication is implemented by installing a base station antenna at a base station and making a beam cover a planning area. A radiation direction of the antenna beam of the base station needs to be adjusted based on changes of factors such as a cell geographic feature and user distribution. The adjustment of the radiation direction generally includes a beam downtilt angle in a vertical dimension and a beam azimuth angle in a horizontal dimension. 
     The adjustment of the beam downtilt angle and the beam azimuth angle is generally implemented by using two implementation solutions: One is to adjust a physical location of the entire base station antenna by using a mechanical apparatus, to adjust the radiation direction of the antenna beam. The other is that a physical location of the base station antenna remains unchanged, and a signal phase of each antenna unit inside the antenna is changed by adjusting a phase shifter inside the antenna, to change the radiation direction of the beam. The first solution is generally implemented by designing a rotatable apparatus on a mounting bracket of the base station antenna and designing an electrically controlled power output apparatus in the antenna, that is, a mechanical electrical tilt (Mechanical electrical tilt, MET). The second solution is generally implemented by designing, in the antenna, a phase shifter connected to each antenna unit and a controller that can control a phase of each output port of the phase shifter, that is, a remote electrical tilt (Remote electrical tilt, RET). 
     As quantities of mobile communications standards and bands increase, obtaining a site resource is increasingly difficult, and sharing a site (sharing a same site location by network operators) becomes a main requirement of an operator. In a co-site case, to avoid visual pollution caused by installing excessive antennas on different bands on the top of a tower of a base station, and increase a load-bearing burden of the tower of the base station, a multi-band antenna, that is, one antenna integrating a plurality of bands, has become an important trend of development of base station antennas. To enable the multi-band antenna to have the foregoing beam pointing adjustment function, the first adjustment solution based on the mechanical electrical tilt cannot meet different tilt function requirements. In the second adjustment solution based on the remote electrical tilt apparatus, a phase shifter and a corresponding MET or RET need to be installed on each band in the antenna. 
     An adjustment apparatus configured to adjust movement of a phase shifter shown in  FIG. 1  includes a drive apparatus  01 , a selection apparatus  02 , a conversion apparatus  03 , and an output apparatus  04 . The drive apparatus  01  includes a first drive shaft  05  and a second drive shaft  06 . The conversion apparatus  03  includes at least two followers. The output apparatus  04  includes at least two output parts, the output part is configured to be connected to the phase shifter, and the selection apparatus includes at least one selection part. The first drive shaft  05  is configured to control the selection part. The selection part is configured to trigger connection or disconnection between the follower and the output part under the drive of the first drive shaft  05 . The second drive shaft  06  is configured to drive the follower, and when the follower is connected to the output part, the follower is configured to drive the output part to rotate under the drive of the second drive shaft  06 , to drive the phase shifter to perform linear movement along an L direction, to change feed phases of different radiation oscillators of an antenna, so that a radiation beam direction of the antenna is tilted downward by a specific angle, thereby changing an electrical downtilt angle of the antenna. 
     As a quantity of bands of an antenna increases, a size of a whole machine of an antenna with 12 bands or more (for example, 20 bands) is limited by factors such as wind resistance, a tower bearing capability, an antenna erection size, and transportation. In addition, a user needs to miniaturize an antenna. All these factors limit the size of the whole machine of the antenna, and internal space of the antenna is increasingly compact, leaving less space for an adjustment apparatus configured to adjust a phase shifter. When the adjustment apparatus shown in  FIG. 1  is used, a plurality of output parts connected to a plurality of phase shifters of a plurality of bands of an antenna are arranged along a direction P. If the bands of the antenna are extended to 12 or more or even to 20, a size of the antenna along the direction P is significantly increased, and therefore a size of a whole machine of the antenna along the direction P (which is generally a width size of the whole machine of the antenna) is significantly increased. Because the width size of the whole machine of the antenna is significantly increased, use performance of the antenna is affected by relatively large wind resistance, and the width size is not balanced with a size (a thickness size of the whole machine of the antenna) along a direction Q vertical to the direction P. To balance the sizes of the whole machine of the antenna along the direction P and the direction Q, and ensure use performance of the antenna, output parts connected to a plurality of phase shifters of bands of the antenna may be arranged along the direction P and the direction Q. In this way, a new adjustment apparatus needs to be designed. 
     SUMMARY 
     Embodiments of this application provide an adjustment apparatus, a multi-band antenna, and a base station, and are mainly intended to provide an adjustment apparatus that can adjust adjustment rods arranged along a first direction and an up-down direction, so as to fully and properly utilize available space inside the antenna while ensuring performance of the antenna. In this way, the entire antenna meets a miniaturization design requirement. 
     To achieve the foregoing objective, the following technical solutions are used in the embodiments of this application. 
     According to a first aspect, this application provides an adjustment apparatus, including: 
     a drive unit; 
     a plurality of adjustment rods, where the plurality of adjustment rods are configured to be correspondingly connected to a plurality of loads one by one, the plurality of adjustment rods are classified into a first adjustment rod group and a second adjustment rod group that are arranged along an up-down direction, the first adjustment rod group and the second adjustment rod group each include a plurality of adjustment rods that are arranged in parallel and at intervals along a first direction, and the first direction is perpendicular to the up-and-down direction; 
     a selection unit, where the selection unit is connected to the drive unit, and the drive unit is configured to drive the selection unit to be connected to at least one adjustment rod in the first adjustment rod group or at least one adjustment rod in the second adjustment rod group; 
     a shift unit, where the shift unit is configured to enable the selection unit to be switched between the first adjustment rod group and the second adjustment rod group; and 
     an adjustment unit, where the adjustment unit is connected to the drive unit, and the drive unit is configured to drive the adjustment unit to drive the adjustment rod connected to the selection unit to move, to drive the corresponding load to move along a direction consistent with an axial direction of the adjustment rod. 
     According to the adjustment apparatus provided in the embodiments of this application, because the plurality of adjustment rods that are correspondingly connected to the plurality of loads one by one are classified into the first adjustment rod group and the second adjustment rod group that are arranged along the up-down direction, the first adjustment rod group and the second adjustment rod group each include the plurality of adjustment rods that are arranged in parallel and at intervals along the first direction, that is, the plurality of adjustment rods are arranged along the up-down direction and along the first direction perpendicular to the up-down direction. For example, when the load is a phase shifter in an antenna, the plurality of adjustment rods are classified into the first adjustment rod group and the second adjustment rod group along the up-down direction. Compared with arranging all the adjustment rods along the first direction, a size of the entire antenna along the first direction can be effectively reduced, thereby avoiding a phenomenon that performance of the antenna is greatly affected due to a relatively large wind resistance caused by a relatively large size of the antenna along the first direction, and ensuring a balance between a size of the antenna along the first direction and a size of the antenna along the up-down direction. Because the first adjustment rod group and the second adjustment rod group are disposed along the up-down direction, the shift unit may be used to enable the selection unit to be switched between the first adjustment rod group and the second adjustment rod group, so as to ensure that the selection unit can select all the adjustment rods, thereby ensuring that phase adjustment can be performed on all the phase shifters. 
     In a possible implementation of the first aspect, the selection unit includes a moving frame, where the moving frame is slidably disposed on a support rod, the drive unit is connected to the moving frame by using a first transmission unit, to drive the moving frame to slide along the support rod, and a sliding direction of the moving frame is parallel to the first direction; a shift shaft that can move synchronously with the moving frame is disposed on the moving frame, an axial direction of the shift shaft is consistent with the axial direction of the adjustment rod, the shift shaft is located between the first adjustment rod group and the second adjustment rod group, a shift wheel is disposed on the shift shaft, a driven wheel matched with the shift wheel is disposed on the adjustment rod, the driven wheel is disposed on a limit frame, the limit frame is configured to prevent the driven wheel from moving along the axial direction of the adjustment rod, the shift shaft is connected to the adjustment unit that can drive the shift shaft to rotate, and the shift shaft can be switched between the first adjustment rod group and the second adjustment rod group by using the shift unit; and the adjustment rod is threadedly connected to the driven wheel; or the adjustment rod is fixedly connected to the driven wheel, the adjustment rod is connected to the corresponding load by using a conversion structure, and the conversion structure is configured to convert rotational movement of the adjustment rod into movement of the load along a direction consistent with the axial direction of the adjustment rod. The selection unit uses the moving frame moving along the first direction, to drive the shift wheel to move along the first direction, so as to implement connection to a driven wheel at an unused location, and drive movement of a load at an unused location. The selection unit has a simple structure, and is easy to implement. The adjustment rod may be threadedly or fixedly connected to the driven wheel. When the adjustment rod is fixedly connected to the driven wheel, the conversion structure is used to convert the rotational movement of the adjustment rod into the movement of the load along the direction consistent with the axial direction of the adjustment rod. 
     In a possible implementation of the first aspect, the conversion structure includes: a first bevel gear, where the first bevel gear is disposed on the adjustment rod; and a second bevel gear, where the second bevel gear is meshed with the first bevel gear, the second bevel gear is connected to a spur gear by using a connecting shaft, a rack matched with the spur gear is disposed on the load, and an extension direction of the rack is consistent with the axial direction of the adjustment rod. When the adjustment rod is fixedly connected to the driven wheel, the rotating driven wheel drives the adjustment rod to rotate synchronously. By using the conversion structure of the structure, that is, the rotating driven wheel drives the adjustment rod to rotate, the rotating adjustment rod drives the second bevel gear to rotate by using the first bevel gear, the second bevel gear drives the spur gear to rotate by using the connecting shaft, and further drives the adjustment rod to move along the axial direction of the adjustment rod by using the rack matched with the spur gear. 
     In a possible implementation of the first aspect, the drive unit includes a first drive shaft, the first transmission unit includes transmission teeth disposed on the first drive shaft, meshing teeth matched with the transmission teeth are disposed on the moving frame, and an arrangement direction of the meshing teeth is parallel to the first direction. By using the transmission teeth disposed on the first drive shaft and the meshing teeth disposed on the moving frame, rotational movement of the first drive shaft is converted into linear movement of the moving frame, the shift shaft, and the shift wheel along the first direction. In addition, the first transmission unit has a simple structure and stable transmission. 
     In a possible implementation of the first aspect, the limit frame includes a first limit plate and a second limit plate that are disposed oppositely, the driven wheel is disposed between the first limit plate and the second limit plate, and the adjustment rod sequentially passes through the first limit plate, the driven wheel, and the second limit plate along an axial direction of the driven wheel. The driven wheel is disposed between the first limit plate and the second limit plate that are opposite, so as to prevent the driven wheel from moving along the axial direction of the adjustment rod, thereby ensuring movement of the adjustment rod. The first limit plate and the second limit plate that are arranged oppositely are used, so that the entire structure is more compact. 
     In a possible implementation of the first aspect, the support rod includes a first support rod and a second support rod that are disposed oppositely, and correspondingly, both ends of the shift shaft are slidably disposed on the first support rod and the second support rod. Using the first support rod and the second support rod that are arranged oppositely can ensure stability of the moving frame and sliding of the shift shaft. 
     In a possible implementation of the first aspect, the adjustment unit includes a transmission shaft, where an axial direction of the transmission shaft is parallel to the first direction, the drive unit is connected to the transmission shaft by using a second transmission unit, to drive the transmission shaft to rotate, the transmission shaft is connected to the shift shaft by using a linkage structure, and the linkage structure is configured to enable the transmission shaft to drive the shift shaft to rotate synchronously. The adjustment apparatus provided in the embodiments of this application is not provided with an independent transmission unit to drive the driven wheel to rotate, but directly uses the linkage structure to drive the rotating transmission shaft to drive the shift shaft to move. In this way, a structure of the entire adjustment apparatus is effectively simplified, a quantity of components is reduced, and space occupied by the adjustment apparatus is reduced. 
     In a possible implementation of the first aspect, the linkage structure includes: a primary bevel gear, where the primary bevel gear is disposed on the transmission shaft; and a secondary bevel gear, where the secondary bevel gear is disposed on the shift shaft and meshed with the primary bevel gear, the primary bevel gear is connected to the shift shaft by using a connecting part, and when the shift shaft moves along the first direction, the primary bevel gear can be driven to move along the transmission shaft by using the connecting part. The primary bevel gear disposed on the transmission shaft and the secondary bevel gear disposed on the shift shaft and matched with the primary bevel gear are used to drive the shift shaft to rotate, to drive the shift wheel to rotate, thereby driving the driven wheel to rotate. A structure is simple. 
     In a possible implementation of the first aspect, the connecting part includes a first connecting plate slidably disposed on the transmission shaft, a second connecting plate connected to the first connecting plate is disposed on the shift shaft, the primary bevel gear is rotatably connected to the first connecting plate, and the secondary bevel gear is rotatably connected to the second connecting plate. By using the first connecting plate and the second connecting plate that are connected, the shift shaft slides to any location, and the primary bevel gear can slide along the transmission shaft, so as to ensure meshing with the secondary bevel gear, thereby ensuring that the rotating transmission shaft drives the shift shaft to rotate. In addition, a structure of the connecting part is relatively simple. 
     In a possible implementation of the first aspect, the drive unit includes a second drive shaft, and the second transmission unit includes a turbine disposed on the transmission shaft and a worm disposed on the second drive shaft and matched with the turbine. The second transmission unit is obtained through meshing of the turbine and the worm, to drive the transmission shaft to rotate. In addition, a structure of the second transmission unit is simple. 
     In a possible implementation of the first aspect, the moving frame is slidably disposed between adjustment rods at both ends of the first adjustment rod group or slidably disposed between adjustment rods at both ends of the second adjustment rod group, the shift shaft includes a first shift shaft and a second shift shaft that are disposed at both ends of the moving frame, the shift wheel includes a first shift wheel disposed on the first shift shaft and a second shift wheel disposed on the second shift shaft, and in a process in which the moving frame moves along the first direction, when one of the first shift wheel and the second shift wheel is meshed with a corresponding driven wheel, the other is located between two corresponding driven wheels. The shift wheel includes a first shift wheel and a second shift wheel. Therefore, when the first shift wheel is meshed with the driven wheel, the second shift wheel is not meshed with the driven wheel, and when the first shift wheel is not meshed with the driven wheel, the second shift wheel is meshed with the driven wheel. Because it is ensured that the shift wheel can be meshed with any one of the driven wheels, a length size of the moving frame along the first direction can be reduced, and further space occupied by the moving frame can be reduced. 
     In a possible implementation of the first aspect, the shift unit includes a first shift conversion box and a second shift conversion box that are disposed oppositely, where the first shift conversion box and the second shift conversion box are disposed oppositely at both ends of the first adjustment rod group and both ends of the second adjustment rod group, a bracket is movably disposed between the first shift conversion box and the second shift conversion box, the shift wheel is disposed on the bracket, the shift shaft passes through the bracket and can slide along an extension direction of the bracket synchronously with the shift wheel, a first abutment surface and a second abutment surface that abut the shift wheel are formed at both ends of the bracket, the first abutment surface is close to the first shift conversion box, the second abutment surface is close to the second shift conversion box, and an up slide is disposed on the first shift conversion box, and a down slide is disposed on the second shift conversion box; and when the shift wheel abuts the first abutment surface, the moving shift shaft and the shift wheel drive the bracket to move along the up slide, so that the shift wheel and the bracket move to the first adjustment rod group, and when the shift wheel abuts the second abutment surface, the moving shift shaft and the shift wheel drive the bracket to move along the down slide, so that the shift wheel and the bracket move to the second adjustment rod group. By using the up slide disposed on the first shift conversion box and the down slide disposed on the second shift conversion box, it is ensured that the shift wheel can be switched between the first adjustment rod group and the second adjustment rod group, so that the shift wheel can be selectively connected to all driven wheels. In addition, the shift unit has a simple structure, and is easy to manufacture. 
     In a possible implementation of the first aspect, the moving frame is disposed on a side of the first adjustment rod group and the second adjustment rod group that are arranged along an up-down direction, the first adjustment rod group is closer to the moving frame relative to the second adjustment rod group, both the up slide and the down slide are inclined slides, one end of the inclined slide faces the first adjustment rod group and the other end faces the second adjustment rod group, and the shift wheel and the bracket are slidably disposed on the shift shaft. The first adjustment rod group and the second adjustment rod group are not disposed oppositely along an up-down direction, so that a size of the entire adjustment apparatus along an up-down direction can be reduced. 
     In a possible implementation of the first aspect, the shift shaft is connected to the shift wheel by using a spline structure, an external spline is disposed on the shift shaft, and an internal spline matched with the outer spline is disposed on the shift wheel. The first adjustment rod group and the second adjustment rod group are not disposed oppositely along the up-down direction. Therefore, when the shift wheel is switched between the first adjustment rod group and the second adjustment rod group, the shift shaft is connected to the shift wheel by using the spline, so that the shift wheel can move along the shift shaft during switching, thereby ensuring that the switched shift wheel can be matched with a corresponding driven wheel of the first adjustment rod group or the second adjustment rod group. 
     In a possible implementation of the first aspect, first support grooves for supporting the bracket are oppositely disposed on the first shift conversion box and the second shift conversion box, and the up slide communicates with the first support groove of the first shift conversion box; and second support grooves for supporting the bracket are oppositely disposed on the first shift conversion box and the second shift conversion box, and the down slide communicates with the second support groove of the second gear shift conversion box. The first support groove and the second support groove are used as support structures of the bracket. The bracket has a simple structure, and is easy to implement. 
     In a possible implementation of the first aspect, the drive unit is disposed above or below the moving frame, the drive unit has a first output shaft, a second output shaft, a first drive shaft arranged up and down with the first output shaft, and a second drive shaft arranged up and down with the second output shaft, the first drive shaft is connected to the selection unit, the second drive shaft is connected to the adjustment unit, a first driving wheel is disposed on the first output shaft, a first driven wheel meshed with the first driving wheel is disposed on the first drive shaft, a second driving wheel is disposed on the second output shaft, and a second driven wheel meshed with the second driving wheel is disposed on the second drive shaft. The drive unit is disposed above or below the moving frame. Therefore, compared with disposing the drive unit on a side of the moving frame, a size occupied by the entire adjustment apparatus along a direction consistent with the axial direction of the adjustment rod is reduced, and a size above or below the moving frame is fully utilized, so that a layout of the entire adjustment apparatus is proper. 
     According to a second aspect, this application further provides a multi-band antenna, including: 
     an antenna array, where the antenna array is configured to radiate an electromagnetic wave in a plurality of bands; 
     a phase shifter, where the phase shifter is connected to the antenna array, and is configured to adjust a phase of the electromagnetic wave of the antenna array, and there are a plurality of phase shifters; and the adjustment apparatus in the possible implementations of the first aspect, where the plurality of adjustment rods of the adjustment apparatus are correspondingly connected to the plurality of phase shifters one by one. 
     According to the multi-band antenna provided in the embodiments of this application, the multi-band antenna includes the adjustment apparatus described in any one of the foregoing technical solutions. Therefore, because the plurality of adjustment rods that are in the adjustment apparatus and that are correspondingly connected to the plurality of phase shifters are classified into the first adjustment rod group and the second adjustment rod group that are disposed along the up-down direction, a size of the entire antenna along the first direction can be effectively reduced, thereby avoiding a phenomenon that the antenna is greatly affected due to a relatively large wind resistance caused by a relatively large size of the antenna along the first direction, and ensuring a balance between a size of the antenna along the first direction and a size of the antenna along the up-down direction. Because the first adjustment rod group and the second adjustment rod group are arranged along the up-down direction, the shift unit may be used to enable the selection unit to be switched between the first adjustment rod group and the second adjustment rod group, so as to ensure that the selection unit can select all the adjustment rods, thereby ensuring that phase adjustment can be performed on all the phase shifters. 
     According to a third aspect, this application further provides a base station, including: 
     a transceiver, and the multi-band antenna in the possible implementations of the second aspect, where 
     the transceiver is configured to receive and transmit a signal transmitted by the multi-band antenna. 
     According to the base station provided in the embodiments of this application, because the base station uses the multi-band antenna described in the implementations of the second aspect, the base station provided in the embodiments of this application can resolve a same technical problem as the multi-band antenna described in the foregoing technical solution, and achieve a same expected effect. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a schematic diagram of a structure of an adjustment apparatus in the conventional technology; 
         FIG. 2  is a schematic diagram of a structure of a multi-band antenna according to an embodiment of this application; 
         FIG. 3  is a block diagram of a structure of an adjustment apparatus according to an embodiment of this application; 
         FIG. 4  is a perspective view of an adjustment apparatus according to an embodiment of this application; 
         FIG. 5  is a top view of an adjustment apparatus according to an embodiment of this application; 
         FIG. 6  is a side view of an adjustment apparatus according to an embodiment of this application; 
         FIG. 7  is a bottom view of an adjustment apparatus according to an embodiment of this application; 
         FIG. 8  is an enlarged view of a part A in  FIG. 7 ; 
         FIG. 9  is a schematic diagram of a structure of a drive unit according to an embodiment of this application; 
         FIG. 10  is a schematic diagram of a connection relationship between a first shift conversion box, a second shift conversion box, a bracket, a shift shaft, and a shift wheel according to an embodiment of this application; 
         FIG. 11  is a schematic diagram of a connection relationship between a first shift conversion box, a second shift conversion box, a bracket, a shift shaft, and a shift wheel according to an embodiment of this application; 
         FIG. 12  is a schematic diagram of a structure of an adjustment apparatus according to an embodiment of this application; 
         FIG. 13  is a schematic diagram of a structure of a conversion structure according to an embodiment of this application; 
         FIG. 14  is a schematic diagram of a meshing state of a first shift wheel, a second shift wheel, and a driven wheel according to an embodiment of this application; 
         FIG. 15  is a schematic diagram of a meshing state of a first shift wheel, a second shift wheel, and a driven wheel according to an embodiment of this application; 
         FIG. 16  is a schematic diagram of a structure of an up side according to an embodiment of this application; and 
         FIG. 17  is a schematic diagram of a structure of a down side according to an embodiment of this application. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Embodiments of this application relate to an adjustment apparatus, a multi-band antenna, and a base station. The following describes the adjustment apparatus, the multi-band antenna, and the base station in detail with reference to accompanying drawings. 
     According to one aspect, an embodiment of this application provides an adjustment apparatus. As shown in  FIG. 2  and  FIG. 3 , an adjustment apparatus  1  includes a drive unit  11 , a plurality of adjustment rods  12 , a selection unit  13 , an adjustment unit  14 , and a shift unit  15 . The plurality of adjustment rods  12  are configured to be correspondingly connected to a plurality of loads one by one, the plurality of adjustment rods  12  are classified into a first adjustment rod group  121  and a second adjustment rod group  122  that are arranged along an up-down direction. As shown in  FIG. 4 , the first adjustment rod group  121  and the second adjustment rod group  122  each include a plurality of adjustment rods  12  that are arranged in parallel and at intervals along a first direction X, and the first direction X is perpendicular to the up-down direction. The selection unit  13  is connected to the drive unit  11 , and the drive unit  11  is configured to drive the selection unit  13  to be connected to at least one adjustment rod  12  in the first adjustment rod group  121  or at least one adjustment rod  12  in the second adjustment rod group  122 . The shift unit  15  is configured to enable the selection unit  13  to be switched between the first adjustment rod group  121  and the second adjustment rod group  122 . The adjustment unit  14  is connected to the drive unit  11 , and the drive unit  11  is configured to drive the adjustment unit  14  to drive the adjustment rod  12  connected to the selection unit  13  to move, to drive the corresponding load to move along a direction consistent with an axial direction of the adjustment rod  12 . 
     It should be noted that, that the plurality of adjustment rods  12  are configured to be correspondingly connected to a plurality of loads one by one indicates that one adjustment rod  12  is configured to be connected to one load. 
     That is, the plurality of adjustment rods  12  are classified into the first adjustment rod group  121  and the second adjustment rod group  122  that are arranged along the up-down direction, and the first adjustment rod group  121  and the second adjustment rod group  122  each include the plurality of adjustment rods  12  that are arranged along the first direction X. In this way, the plurality of adjustment rods  12  are arranged along the first direction X and arranged along the up-down direction. Compared with the conventional technology in which not all adjustment rods  12  are disposed along the first direction, sizes occupied along the first direction when all the adjustment rods  12  are disposed along the first direction can be reduced. For example, when the load is a phase shifter, the adjustment apparatus in this application reduces a size of the entire antenna along the first direction, so as to avoid a phenomenon of a relatively large wind resistance caused by a relatively large size along the first direction. In addition, the adjustment rods are arranged along the up-down direction, so as to ensure a balance between a size of the antenna along the first direction and a size of the antenna along the up-down direction. In this way, a layout of the antenna is proper. 
     Because the adjustment rods  12  are classified into the first adjustment rod group  121  and the second adjustment rod group  122  that are disposed along the up-down direction, the shift unit  15  may be used to enable the selection unit  13  to be switched between the first adjustment rod group  121  and the second adjustment rod group  122 , so as to ensure that the selection unit  13  can be selectively connected to the adjustment rods in the first adjustment rod group  121  and the adjustment rods in the second adjustment rod group  122 , thereby implementing selective connection to all the adjustment rods  12 , and finally ensuring adjustment of all the loads. 
     In some implementations, as shown in  FIG. 4 , the selection unit  13  includes a moving frame  131 , where the moving frame  131  is slidably disposed on a support rod  132 , the drive unit  11  is connected to the moving frame  131  by using a first transmission unit, to drive the moving frame  131  to slide along the support rod  132 , and a sliding direction of the moving frame  131  is parallel to the first direction X. As shown in  FIG. 5  and  FIG. 6 , a shift shaft  133  that can move synchronously with the moving frame  131  is disposed on the moving frame  131 , an axial direction of the shift shaft  133  is consistent with the axial direction of the adjustment rod  12 , the shift shaft  133  is located between the first adjustment rod group  121  and the second adjustment rod group  122 , a shift wheel  134  (as shown in  FIG. 10 ) is disposed on the shift shaft  133 , and a driven wheel  136  matched with the shift wheel  134  is disposed on the adjustment rod  12 . As shown in  FIG. 4 , the driven wheel  136  is disposed on a limit frame  135 , the limit frame  135  is configured to prevent the driven wheel  136  from moving along the axial direction of the adjustment rod  12 , the shift shaft  133  is connected to the adjustment unit  14  that can drive the shift shaft  133  to rotate, and the shift shaft  134  can be switched between the first adjustment rod group  121  and the second adjustment rod group  122  by using the shift unit  15 . 
     A working principle of the selection unit  13  is as follows: The drive unit  11  drives the moving frame  131  to move along the first direction X by using the first transmission unit, and the moving frame  131  that is moving drives the shift shaft  133  and the shift wheel  134  to also move along the first direction X. When the moving frame  131  moves to an adjustment rod  12  that needs to be selected from the first adjustment rod group  121  or the second adjustment rod group  122 , the drive unit  11  drives the moving frame  131  to stop moving by using the first transmission unit, so that the shift wheel  134  is meshed with the selected driven wheel  136 . When switching between the first adjustment rod group  121  and the second adjustment rod group  122  needs to be performed, the shift wheel  134  may be switched between the first adjustment rod group  121  and the second adjustment rod group  122  by using the shift unit  15 , so that the shift wheel  134  moves to the first adjustment rod group  121  or the second adjustment rod group  122 . 
     There are a plurality of cases of a connection structure between the driven wheel  136  and the adjustment rod  12 . For example, as shown in  FIG. 4 , the adjustment rod  12  is threadedly connected to the driven wheel  136 , that is, the driven wheel  136  and the adjustment rod  12  are screwed. When the driven wheel  136  rotates around a rotation axis of the driven wheel  136 , the adjustment rod  12  moves linearly along an axis of the adjustment rod  12 , to drive the load to move along a direction consistent with the axial direction of the adjustment rod  12 . As shown in  FIG. 12 , for another example, the adjustment rod  12  is fixedly connected to the driven wheel  136 . To enable the load to move along a direction consistent with the axial direction of the adjustment rod  12 , the adjustment rod  12  is connected to the corresponding load by using a conversion structure  123 , and the conversion structure  123  is configured to convert rotational movement of the adjustment rod  12  into movement of the load along the direction consistent with the axial direction of the adjustment rod  12 . Compared with a structure shown in  FIG. 12 , in the structure shown in  FIG. 4 , the driven wheel  136  is threadedly connected to the adjustment rod  12 , a structure is simple, and a quantity of parts is small, thereby effectively simplifying a structure of the entire adjustment apparatus, and further reducing space occupied by the entire adjustment apparatus. Certainly, that the adjustment rod  12  is connected to the driven wheel  136  in another connection structure is also within the protection scope of this application. 
     In some implementations, as shown in  FIG. 13 , the conversion structure  123  includes a first bevel gear  1231 , a second bevel gear  1232 , a connecting shaft  1233 , and a spur gear  1234 , and the first bevel gear  1231  is disposed on the adjustment rod  12 . The second bevel gear  1232  is meshed with the first bevel gear  1231 , the second bevel gear  1232  is connected to the spur gear  1234  by using the connecting shaft  1233 , a rack matched with the spur gear  1234  is disposed on the load, and an extension direction of the rack is consistent with the axial direction of the adjustment rod. A working principle of the conversion structure  123  is as follows: When the first bevel gear  1231  rotates synchronously with the adjustment rod  12 , the second bevel gear  1232  rotates around a rotation axis of the second bevel gear  1232 , and then the spur gear  1234  rotates by using the connecting shaft  1233 . The rotating spur gear  1233  is meshed with the rack on the load, to drive the load to move linearly along a direction consistent with the axial direction of the adjustment rod  12 . Certainly, the conversion structure  123  may also be of another structure, and a conversion structure  123  of any structure falls within the protection scope of this application. 
     To further simplify the structure of the entire adjustment apparatus, a drive unit for driving the selection unit  13  and a drive unit for driving the adjustment unit  14  are a same drive unit. As shown in  FIG. 9 , the drive unit  11  includes a first drive shaft  111  and a second drive shaft  112 . The first drive shaft  111  is connected to the selection unit  13 , and the second drive shaft  112  is connected to adjustment unit  14 . That is, the first drive shaft  111  first drives the selection unit  13 , so that the shift wheel is meshed with a driven wheel  136  that needs to be selected. Then, the second drive shaft  112  drives the adjustment unit  14 , so that the shift wheel  134  drives the selected driven wheel  136  to rotate, thereby driving the load to move. 
     In some implementations, as shown in  FIG. 4 , the first transmission unit includes transmission teeth  138  disposed on the first drive shaft  111 , meshing teeth  137  matched with the transmission teeth  138  are disposed on the moving frame  131 , and an arrangement direction of the meshing teeth  137  is parallel to the first direction X, that is, rotational movement of the first drive shaft  111  is converted into linear movement of the moving frame  131 , and a structure of the first transmission unit is simple and easy to implement. 
     To make the structure of the entire adjustment apparatus compact, as shown in  FIG. 4  and  FIG. 5 , the limit frame  135  for preventing the driven wheel  136  from moving along the axial direction of the adjustment rod  12  in embodiments of this application includes a first limit plate and a second limit plate that are disposed oppositely, the driven wheel  136  is disposed between the first limit plate and the second limit plate, and the adjustment rod  12  sequentially passes through the first limit plate, the driven wheel  136 , and the second limit plate along an axial direction of the driven wheel  136 . The first adjustment rod group  121  includes a plurality of adjustment rods, and correspondingly, there are a plurality of driven wheels  136 . Similarly, the second adjustment rod group  122  includes a plurality of adjustment rods, and correspondingly, there are a plurality of driven wheels  136 . Therefore, to simplify the structure, there is one first limit plate and one second limit plate that are used to limit the plurality of driven wheels  136  in the first adjustment rod group  121 , and similarly, there is one first limit plate and one second limit plate that are used to limit the plurality of driven wheels  136  in the second adjustment rod group  122 . This simplifies the structure and facilitates installation. 
     In some implementations, as shown in  FIG. 4 , the adjustment unit  14  includes a transmission shaft  141 . An axial direction of the transmission shaft  141  is parallel to the first direction X, the drive unit  11  is connected to the transmission shaft  141  by using a second transmission unit, to drive the transmission shaft  141  to rotate, the transmission shaft  141  is connected to the shift shaft  133  by using a linkage structure, and the linkage structure is configured to enable the transmission shaft  141  to drive the shift shaft to rotate synchronously. As shown in  FIG. 7  and  FIG. 8 , for example, the linkage structure includes a primary bevel gear  142  and a secondary bevel gear  143 . The primary bevel gear  142  is disposed on the transmission shaft  141 , and can rotate synchronously with the transmission shaft  141 . The secondary bevel gear  143  is disposed on the shift shaft  133  and meshed with the primary bevel gear  142 , the primary bevel gear  142  is connected to the shift shaft  133  by using a connecting part, and when the shift shaft  133  moves along the first direction X, the primary bevel gear  142  can be driven to move along the transmission shaft  141  by using the connecting part. For another example, the linkage structure includes a worm disposed on the transmission shaft and a turbine disposed on the shift shaft and matched with the worm. Certainly, the linkage structure may also be another structure. 
     A working principle of the adjustment unit  14  is as follows: The drive unit  11  drives the transmission shaft  141  to rotate around a rotation axis of the transmission shaft  141  by using the second transmission unit, and the rotating transmission shaft  141  drives the primary bevel gear  142  to rotate, to drive the secondary bevel gear  143  to rotate. The rotating secondary bevel gear  143  drives the shift shaft  133  to rotate, to finally drive the driven wheel  136  meshed with the shift wheel  134  to rotate. 
     The adjustment unit  14  provided in embodiments of this application drives the shift shaft  133  to rotate by using the linkage structure, to drive the shift wheel  134  to rotate, and further drive the driven wheel  136  to rotate. In this way, it is advantageous that the transmission unit that directly drives the driven wheel  136  is not used, but the shift shaft  133  is driven to rotate by using the linkage structure, so that a quantity of parts can be reduced, a structure can be simplified, and space occupied by the entire adjustment apparatus can be reduced. 
     When the primary bevel gear disposed on the transmission shaft  141  rotates with the transmission shaft  141 , the primary bevel gear also needs to move with the shift shaft  134  along the first direction. For example, the primary bevel gear is connected to the transmission shaft by using a spline, that is, an external spline is disposed on the transmission shaft, and an internal spline is disposed on the primary bevel gear. 
     In some implementations, as shown in  FIG. 8 , the connecting part includes a first connecting plate  144  slidably disposed on the transmission shaft  141 , a second connecting plate  145  connected to the first connecting plate  144  is disposed on the shift shaft  133 , the primary bevel gear  142  is rotatably connected to the first connecting plate  144 , and the secondary bevel gear  143  is rotatably connected to the second connecting plate  145 . The connecting part may also be of another structure. A specific structure of the connecting part is not limited herein, and any structure falls within the protection scope of this application. 
     As shown in  FIG. 4 , the second transmission unit includes a turbine  145  disposed on the transmission shaft  141  and a worm  146  disposed on the second drive shaft  112  and matched with the turbine  145 . The transmission shaft  141  is driven to rotate by using the turbine and the worm. This achieves a simple structure, and relatively stable transmission of the turbine and the worm. 
     When the adjustment rod  12  in the first adjustment rod group  121  or the adjustment rod  12  in the second adjustment rod group  122  is selectively connected, any adjustment rod  12  in the first adjustment rod group  121  or the second adjustment rod group  122  needs to be connected. To reduce a size of the moving frame  131  along the first direction and ensure that any adjustment rod  12  can be connected, as shown in  FIG. 4 , the moving frame  131  is slidably disposed between adjustment rods  12  at both ends of the first adjustment rod group  121  or slidably disposed between adjustment rods  12  at both ends of the second adjustment rod group  122  (as shown in  FIG. 4 , the adjustment rods  12  at both ends of the first adjustment rod group  121  are an adjustment rod A 1  and an adjustment rod A 2 , and the adjustment rods  12  at both ends of the second adjustment rod group  122  are an adjustment rod B 1  and an adjustment rod B 2 ). As shown in  FIG. 6 , the shift shaft includes a first shift shaft  1331  and a second shift shaft  1332  that are disposed at both ends of the moving frame, and the shift wheel  134  includes a first shift wheel  1341  disposed on the first shift shaft  1331  and a second shift wheel  1342  disposed on the second shift shaft  1332 . As shown in  FIG. 14  and  FIG. 15 , in a process in which the moving frame moves along the first direction, when one of the first shift wheel  1341  and the second shift wheel  1342  is meshed with a corresponding driven wheel  136 , the other is located between two corresponding driven wheels  136 . 
     With reference to  FIG. 14  and  FIG. 15 , for example, if there are seven driven wheels  136  on the first adjustment rod group  121 , which are a first driven wheel, a second driven wheel, a third driven wheel, a fourth driven wheel, a fifth driven wheel, a sixth driven wheel, and a seventh driven wheel from left to right, and a distance between every two adjacent driven wheels is a, a distance between an axle center of the first driven wheel and an axle center of the seventh driven wheel is 6a, there are the first shift wheel  1341  and the second shift wheel  1342  from left to right, and a distance between an axle center of the first shift wheel  1341  and an axle center of the second shift wheel  1342  is 3.5a. When the axle center of the first shift wheel  1341  is aligned with the axle center of the first driven wheel, the axle center of the second shift wheel  1342  is located between an axle center of the fourth driven wheel and an axle center of the fifth driven wheel. If the axle center of the second shift wheel  1342  needs to be aligned with the axle center of the fifth driven wheel, the moving frame moves to the right by a/2. In this case, the axle center of the second shift wheel  1342  is aligned with the axle center of the fifth driven wheel, and the axle center of the first shift wheel  1341  is located between the axle center of the first driven wheel and the axle center of the second driven wheel. A technical effect achieved in this design is as follows: A length size of the moving frame is only 3.5a, so that selective meshing of all the driven wheels on the first adjustment rod group can be ensured. If only one shift wheel is used, the length size of the moving frame is at least 6a. Therefore, the technical solution used in this application can significantly reduce a size of the moving frame, to further reduce a size of the entire adjustment apparatus along the first direction, and coincides with a technical effect achieved by setting the first adjustment rod group and the second adjustment rod group. It should be noted that, the foregoing is described only by using the specific embodiments in  FIG. 14  and  FIG. 15 , and it is not determined that the distance between the two adjacent driven wheels is a, the distance between the axle center of the first driven wheel and the axle center of the seventh driven wheel is 6a, and the distance between the axle center of the first shift wheel  1341  and the axle center of the second shift wheel  1342  is 3.5a. 
     In some implementations, as shown in  FIG. 10  and  FIG. 11 , the shift unit  15  includes a first shift conversion box  151  and a second shift conversion box  152  that are disposed oppositely. The first shift conversion box  151  and the second shift conversion box  152  are disposed oppositely at both ends of the first adjustment rod group  121  and both ends of the second adjustment rod group  122 , a bracket  153  is movably disposed between the first shift conversion box  151  and the second shift conversion box  152 , the shift wheel  134  is disposed on the bracket  153 , the shift shaft  133  passes through the bracket  153  and can slide along an extension direction of the bracket  153  synchronously with the shift wheel  134 , a first abutment surface  154  and a second abutment surface  155  that abut the shift wheel  134  are formed at both ends of the bracket  153 , the first abutment surface  154  is close to the first shift conversion box  151 , the second abutment surface  155  is close to the second shift conversion box  152 , an up slide  156  is disposed on the first shift conversion box  151 , and a down slide  157  is disposed on the second shift conversion box  152 . When the shift wheel  134  abuts the first abutment surface  154 , the moving shift shaft  133  and the shift wheel  134  drive the bracket  153  to move along the up slide  156 , so that the shift wheel  134  and the bracket  153  move to the first adjustment rod group  121 , and when the shift wheel  134  abuts the second abutment surface  155 , the moving shift shaft  133  and the shift wheel  134  drive the bracket  153  to move along the down slide  157 , so that the shift wheel  134  and the bracket  153  move to the second adjustment rod group  122 . 
     That is, by using the up slide  156  disposed on the first shift conversion box  151  and the down slide  157  disposed on the second shift conversion box  152 , the shift wheel  134  is switched between the first adjustment rod group  121  and the second adjustment rod group  122 . In addition, in embodiments, switching movement of the shift wheel  134  between the first adjustment rod group  121  and the second adjustment rod group  122  is movement performed by using the shift shaft  133  and the shift wheel  134  along the first direction, and a push force is applied to the bracket  153 , so that the bracket  153  and the shift wheel  134  are switched between the first adjustment rod group  121  and the second adjustment rod group  122 , thereby ensuring selective meshing with the driven wheel on the first adjustment rod group  121  and the driven wheel on the second adjustment rod group  122 , without setting an independent push structure for driving the bracket  153  and the shift wheel  134  to move. In this way, the structure of the entire adjustment apparatus is effectively simplified. 
     When the shift wheel includes the first shift wheel and the second shift wheel, the first shift wheel is closer to the first shift conversion box relative to the second shift wheel, and the second shift wheel is closer to the second shift conversion box relative to the first shift wheel. In this case, when the first shift wheel abuts the first abutment surface, the moving shift shaft and the first shift wheel drive the bracket to move along the up slide, so that the first shift wheel, the second shift wheel, and the bracket move to the first adjustment rod group. When the second shift wheel abuts the second abutment surface, the moving shift shaft and the second shift wheel drive the bracket to move along the down slide, so that the second shift wheel, the first shift wheel, and the bracket move to the second adjustment rod group. 
     In some implementations, the first adjustment rod group  121  and the second adjustment rod group  122  may be disposed facing each other along an up-down direction. In some other implementations, as shown in  FIG. 4 , the first adjustment rod group  121  and the second adjustment rod group  122  are not disposed facing each other along an up-down direction. In this application, the first adjustment rod group  121  and the second adjustment rod group  122  are preferably not disposed facing each other along an up-down direction. In this way, when the first adjustment rod group  121  and the second adjustment rod group  122  are disposed facing each other along an up-down direction, the shift wheel is disposed between the first adjustment rod group  121  and the second adjustment rod group  122 . Therefore, to ensure that the shift wheel is not meshed with the driven wheel on the second adjustment rod group  122  when the shift wheel is meshed with the driven wheel on the first adjustment rod group  121 , and there is a spacing b between the shift wheel and the driven wheel on the second adjustment rod group  122  when the shift wheel is meshed with the driven wheel on the first adjustment rod group  121 . In this case, a distance between the driven wheel on the first adjustment rod group  121  and the driven wheel on the second adjustment rod group  122  is equal to a sum of a radius of the driven wheel on the first adjustment rod group  121 , a radius of the driven wheel on the second adjustment rod group  122 , and the spacing b. However, when the first adjustment rod group  121  and the second adjustment rod group  122  are not disposed facing each other along an up-down direction, a distance between the driven wheel on the first adjustment rod group  121  and the driven wheel on the second adjustment rod group  122  is equal to a sum of a radius of the driven wheel on the first adjustment rod group  121  and a radius of the driven wheel on the second adjustment rod group  122 . Therefore, the first adjustment rod group  121  and the second adjustment rod group  122  may not be disposed facing each other along an up-down direction, so that a size of the entire adjustment apparatus along an up-down direction can be reduced. 
     For example, the moving frame  131  is disposed on a side of the first adjustment rod group  121  and the second adjustment rod group  122  that are arranged along an up-down direction, and the first adjustment rod group  121  is closer to the moving frame  131  relative to the second adjustment rod group  122 . As shown in  FIG. 16  and  FIG. 17 , both the up slide  156  and the down slide  157  are inclined slides, and one end of the inclined slide faces the first adjustment rod group  121  and the other end faces the second adjustment rod group  122 . Because both the up slide  156  and the down slide  157  are inclined slides, the shift wheel and the bracket are slidably disposed on the shift shaft. In this way, it can be ensured that a shift wheel after shifting is connected to a corresponding driven wheel on the first adjustment rod group and the second adjustment rod group. 
     In some implementations, the shift shaft is connected to the shift wheel by using a spline structure, that is, an external spline is disposed on the shift shaft, and an internal spline matched with the outer spline is disposed on the shift wheel. In this way, when the bracket slides along the inclined slide, the shift wheel can slide along the shift shaft. 
     A sliding groove for the shift shaft  133  to slide along the first direction is disposed on the bracket  153 . 
     As shown in  FIG. 10  and  FIG. 11 , first support grooves  158  for supporting the bracket  153  are oppositely disposed on the first shift conversion box  151  and the second shift conversion box  152 , and the up slide  156  communicates with the first support groove  158  of the first shift conversion box  151 . Second support grooves  159  for supporting the bracket  153  are oppositely disposed on the first shift conversion box  151  and the second shift conversion box  152 , and the down slide  157  communicates with the second support groove  159  of the second gear shift conversion box  152 . Specific structures of the first support groove  158  and the second support groove  159  are not limited herein, and any structure falls within the protection scope of this application. 
     To reduce a size of the entire adjustment apparatus along a direction consistent with the axial direction of the adjustment rod, as shown in  FIG. 4  and  FIG. 6 , the drive unit  11  is disposed above or below the moving frame  131 , the drive unit  11  has a first output shaft  113 , a second output shaft  114 , a first drive shaft  111  arranged up and down with the first output shaft  113 , and a second drive shaft  112  arranged up and down with the second output shaft  114 , the first drive shaft  111  is connected to the selection unit  13 , the second drive shaft  112  is connected to the adjustment unit  14 , a first driving wheel  115  is disposed on the first output shaft  113 , a first driven wheel  116  meshed with the first driving wheel  115  is disposed on the first drive shaft  111 , a second driving wheel  117  is disposed on the second output shaft  114 , and a second driven wheel  118  meshed with the second driving wheel  117  is disposed on the second drive shaft  112 . The drive unit is disposed above or below the moving frame, instead of being disposed along a direction consistent with the axial direction of the adjustment rod. In this way, space above or below the moving frame is fully utilized, so that a layout of the entire adjustment apparatus is more proper. 
     As shown in  FIG. 4  and  FIG. 5 , the support rod includes a first support rod and a second support rod, and both ends of the shift shaft are correspondingly slidably disposed on the first support rod and the second support rod. In this way, sliding stability of the shift shaft can be improved, and working stability of the entire adjustment apparatus can be further ensured. 
     With reference to  FIG. 4 ,  FIG. 8 ,  FIG. 10 , and  FIG. 11 , a working process of the adjustment apparatus provided in embodiments of this application is described in detail: If the load correspondingly connected to the adjustment rod  12  in the first adjustment rod group  121  needs to be adjusted, the first drive shaft  111  rotates to drive the moving frame  131  to move along the first direction X, to drive the shift shaft  133  and the shift wheel  134 , and the primary bevel gear  142  disposed on the transmission shaft  141  to move. When the shift shaft  133 , the shift wheel  134 , and the primary bevel gear  142  move to the adjustment rod that corresponds to the load and that needs to be adjusted, the first drive shaft  111  stops rotating, and the second drive shaft  112  rotates, to drive the transmission shaft  141  to rotate. The rotating transmission shaft  141  drives the primary bevel gear  142  to rotate synchronously, and the primary bevel gear  142  drives the secondary bevel gear  143  to rotate, to drive the shift shaft  133  and the shift wheel  134  to rotate. The shift wheel  134  drives the driven wheel  136  meshed with the shift wheel  134  to rotate. When the adjustment rod  12  is threadedly connected to the driven wheel  136 , the rotating driven wheel  136  drives the adjustment rod  12  to move linearly along an axial direction of the driven wheel  136 , and finally drives the load to move linearly. If the load corresponding to the adjustment rod  12  in the second adjustment rod group  122  needs to be adjusted, the shift shaft  133  and the shift shaft  134  move to an end of the bracket  153  near the down slide  157 , and the moving shift shaft  133  and the shift wheel  134  drive the bracket  153  to slide along the down slide  157 . A specific process of adjusting the load correspondingly connected to the second adjustment rod group  122  is the same as the foregoing process of adjusting the load correspondingly connected to the first adjustment rod group  121 . 
     According to another aspect, an embodiment of this application further provides a multi-band antenna. As shown in  FIG. 2 , the multi-band antenna includes an antenna array  2 , a phase shifter  3 , and the adjustment apparatus  1  provided in the foregoing embodiment. The antenna array  2  is configured to radiate an electromagnetic wave in a plurality of bands, the phase shifter  3  is connected to the antenna array  2 , and is configured to adjust a phase of the electromagnetic wave of the antenna array  2 , and there are a plurality of phase shifters  3 . The plurality of adjustment rods  12  of the adjustment apparatus  1  are correspondingly connected to a plurality of phase shifters  3  one by one, that is, one adjustment rod  12  is connected to one phase shifter  3 . 
     The multi-band antenna provided in embodiments of this application includes the adjustment apparatus provided in the foregoing embodiment, and the adjustment apparatus is used to adjust the phase shifter  3  to move linearly along a direction consistent with the axial direction of the adjustment rod  12 , to adjust an electric downtilt angle of the antenna. Because the plurality of adjustment rods that are in the adjustment apparatus and that are correspondingly connected to the plurality of phase shifters are classified into the first adjustment rod group and the second adjustment rod group that are disposed along the up-down direction, a size of the entire antenna along the first direction (which is usually a width size of the antenna) can be effectively reduced, thereby avoiding a phenomenon that the antenna is greatly affected due to a relatively large wind resistance caused by a relatively large size of the antenna along the first direction, and ensuring a balance between a size (which is usually a thickness size) of the antenna along the first direction and a size of the antenna along the up-down direction. Because the first adjustment rod group and the second adjustment rod group are arranged along the up-down direction, the shift unit may be used to enable the selection unit to be switched between the first adjustment rod group and the second adjustment rod group, so as to ensure that the selection unit can select all the adjustment rods, thereby ensuring that phase adjustment can be performed on all the phase shifters. The adjustment apparatus in the antenna provided in embodiments of this application can fully and properly utilize available space inside the antenna, so that the antenna meets a miniaturization design requirement. 
     According to another aspect, an embodiment of this application further provides a base station. The base station includes a transceiver and the multi-band antenna provided in the foregoing embodiment, and the transceiver is configured to receive a signal transmitted by the multi-band antenna. 
     Because the base station includes the multi-band antenna provided in the foregoing embodiment, a technical problem resolved by the base station is the same as the technical problem resolved by the multi-band antenna, and a technical effect achieved by the base station is also the same as the technical effect achieved by the multi-band antenna. 
     In the descriptions of this specification, the described specific features, structures, materials, or characteristics may be combined in a proper manner in any one or more of the embodiments or examples. 
     The foregoing descriptions are merely specific implementations of the present invention, but are not intended to limit the protection scope of the present invention. Any variation or replacement readily figured out by a person skilled in the art within the technical scope disclosed in the present invention shall fall within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.