Antenna downtilt adjustment apparatus and communications device

This application provides an antenna downtilt adjustment apparatus, including: a first transmission assembly, a flexible transmission assembly, and a second transmission assembly that are disposed on a mounting plate. The flexible transmission assembly includes a transmission element and a guiding element. The transmission element is in an integrated long strip shape and bendable. One end of the transmission element mates with the first transmission assembly, and the other end of the transmission element mates with the second transmission assembly. The guiding element is secured to the mounting plate, and the guiding element is configured to constrain an extension path of the transmission element on the mounting plate. The first transmission assembly is driven by an antenna information management module, and transmits a force to the second transmission assembly by using the transmission element. The second transmission assembly is configured to drive a phase shifter, to adjust an antenna downtilt.

TECHNICAL FIELD

This application relates to the field of communications technologies, and specifically, to an antenna downtilt adjustment apparatus and a communications device.

BACKGROUND

In a mobile communications system, a beam tilt (generally referred to as a downtilt of a beam, a downtilt for short) of an antenna is adjusted to adjust an area covered by a mobile communications signal. The beam tilt of the antenna is adjusted by adjusting a phase shifter inside the antenna. In this way, a signal phase of each unit inside the antenna changes, thereby changing the beam tilt.

With limitation on a site resource of a mobile base station, a multi-band antenna is increasingly demanded. Currently, the multi-band antenna is already a mainstream application. Because of strength of a mechanical part (such as a pole or a tower) bearing the multi-band antenna, a structure size, especially a length and a width of the antenna needs to be as small as possible, to reduce wind load and weight. Therefore, smaller space occupied by a downtilt adjustment apparatus disposed inside the multi-band antenna is more conducive to reducing a size of the multi-band antenna.

Currently, a mainstream downtilt adjustment apparatus is transmitted and connected by using a rigid mechanical part, and cannot be flexibly disposed inside the antenna. In addition, because of a plurality of times of transfer connections and connections, the mainstream downtilt adjustment apparatus occupies large space inside the antenna, and has low transmission efficiency.

SUMMARY

Embodiments of this application provide an antenna downtilt adjustment apparatus and a communications device. The antenna downtilt adjustment apparatus has an advantage of flexible disposition, and can reduce a quantity of times of transfer connections and improve transmission efficiency.

A first aspect of this application provides an antenna downtilt adjustment apparatus, including: a first transmission assembly, a flexible transmission assembly, and a second transmission assembly that are disposed on a mounting plate. The flexible transmission assembly includes a transmission element and a guiding element. The transmission element is in an integrated long strip shape and bendable. One end of the transmission element mates with the first transmission assembly, and the other end of the transmission element mates with the second transmission assembly. The guiding element is secured to the mounting plate, and the guiding element is configured to constrain an extension path of the transmission element on the mounting plate. The first transmission assembly is driven by an antenna information management module, and transmits a force to the second transmission assembly by using the transmission element. The second transmission assembly is configured to drive a phase shifter, to adjust an antenna downtilt.

Specifically, the transmission element transmits a straight pull force or a rotational force between the first transmission assembly and the second transmission assembly.

In an implementation, the mounting plate is a metal reflection plate, to reflect an antenna signal. The transmission element is insulated from the mounting plate, to isolate the transmission element from an antenna, and to ensure an effect of receiving and sending a signal by the antenna.

In an implementation, the transmission element includes a transmission component and an insulated sleeve wrapped around a periphery of the transmission component. The insulated sleeve is wrapped around the periphery of the transmission component, to isolate the transmission component from the outside. Disposition of the insulated sleeve can isolate the transmission element from another component (for example, a component of the antenna) on the mounting plate, to avoid intermodulation.

In an implementation, the guiding element includes a securing part, a connecting part, and a mating part. The securing part is configured to be securely connected to the mounting plate, the connecting part is connected between the securing part and the mating part, and the mating part is configured to mate with the transmission element, to guide and support installation of the transmission element on the mounting plate. The connecting part is disposed between the mating part and the securing part, to absorb a vibration generated during a working process of the transmission element, thereby reducing impact of the vibration on the antenna.

In an implementation, a through hole is provided in the connecting part, and the through hole is provided between the mating part and the securing part. The provision of the through hole increases flexibility of the connecting part, and improves an effect of absorbing the vibration.

In an implementation, a material of the connecting part is a material having a buffer function, for example, silica gel. In this embodiment, an effect of absorbing the vibration generated by the transmission element of the connecting part is enhanced by selecting the material.

In an implementation, the antenna downtilt adjustment apparatus further includes a reset assembly. The reset assembly is elastically connected between the transmission element and the second transmission assembly, and is configured to provide a reset force for the transmission element.

Specifically, the reset assembly includes a spring and a securing block. The securing block is secured to the mounting plate, and installation space is provided between the securing block and the second transmission assembly. The spring is sleeved around a periphery of the transmission element and is accommodated in the installation space. One end of the spring is secured to the securing block, and the other end of the spring is secured to the second transmission assembly or the transmission element.

One part of the transmission element for sleeving of the spring and the other part of the transmission element may be of an integrated structure. Alternatively, a guiding rod may be secured to one end of the transmission element, and the spring may be sleeved around a periphery of the guiding rod. The guiding rod may be designed as a telescopic rod. A length of the guiding rod can be adjusted, and an elastic force of the spring may be adjusted by adjusting the length of the guiding rod.

In an implementation, the antenna downtilt adjustment apparatus further includes the antenna information management module and the phase shifter. The antenna information management module and the phase shifter are installed on a back side of the mounting plate and each are close to one of two opposite ends of the mounting plate. A radiating element of the antenna is disposed on a front side of the mounting plate. The phase shifter is connected to the radiating element of the antenna and is configured to adjust an antenna downtilt.

Specifically, a control plate and a communications interface and a motor that are electrically connected to the control plate are disposed in the antenna information management module. The communications interface is configured to receive a control signal from a base station. The control plate drives the motor after processing the control signal, and the motor is configured to drive the first transmission assembly.

In an implementation, the first transmission assembly includes a motor interface, the motor interface is connected to the motor of the antenna information management module, to transmit a driving force of the motor; and the antenna information management module drives the first transmission assembly by using the motor.

In an implementation, the second transmission assembly is a straight pull rod. One end of the straight pull rod is secured to the transmission element, and the other end is secured to the phase shifter. The first transmission assembly drives the transmission element to move, to push or pull the straight pull rod.

In an implementation, the first transmission assembly drives the transmission element to rotate. The second transmission assembly includes a worm and worm wheel assembly. A rotational motion of the transmission element drives a rotational motion of the second transmission assembly, and drives the phase shifter to rotate.

In an implementation, the second transmission assembly is a push and pull rod. A conversion assembly is disposed between the second transmission assembly and the transmission element. The first transmission assembly drives the transmission element to rotate, and the conversion assembly converts the rotational motion of the transmission element into a direct motion, to drive the second transmission assembly to move in a straight line.

Specifically, the conversion assembly includes a worm wheel, a worm, a gear, and a gear rack. The worm is connected to the transmission element, the gear rack is connected to the second transmission assembly, and the worm wheel shares a shaft with the gear. The transmission element drives the worm to rotate, drives the gear to rotate through mating of the worm and the worm wheel and synchronous rotation of the worm wheel and the gear, and drives the second transmission assembly to move in a straight line through mating of the gear and the gear rack.

In an implementation, there are at least two phase shifters and at least two second transmission assemblies. Each of the second transmission assemblies drives one phase shifter, to form a one-to-one correspondence. The transmission element is connected to the at least two second transmission assemblies.

In an implementation, there are at least two phase shifters, at least two second transmission assemblies, and at least two transmission elements. Each of the second transmission assemblies is connected between one transmission element and one phase shifter. A combiner module is disposed between the at least two transmission elements and the first transmission assembly, and the combiner module is configured to implement conversion between the first transmission assembly and the at least two transmission elements.

Specifically, the combiner module includes one input shaft and at least two output shafts. The input shaft is connected to the first transmission assembly, and the at least two output shafts are separately connected to the at least two transmission elements. A force between the input shaft and the at least two output shafts is transmitted by using a gear.

According to another aspect, this application further provides a communications device, including a base station and the foregoing antenna downtilt adjustment apparatus. An antenna information management module of the antenna downtilt adjustment apparatus is communicatively connected the base station, to receive a control signal from the base station, adjust an antenna downtilt, and report adjustment information to the base station.

According to the antenna downtilt adjustment apparatus provided in this application, the transmission element of the flexible transmission assembly is in an integrated long strip shape, so that the flexible transmission assembly transmits a force between the first transmission assembly and the second transmission assembly. The transmission element in an integrated long strip shape can reduce a quantity of times of transfer connections between the first transmission assembly and the second transmission assembly, and improve transmission efficiency. In addition, the transmission element is bendable, and therefore installation of the transmission element on the mounting plate is more flexible through mating of the transmission element and the guiding element. If there is a component that needs to be avoided on the extension path of the transmission element, the transmission element may be bent as required. In this way, the transmission element can be extended in an open area on the mounting plate.

DESCRIPTION OF EMBODIMENTS

An embodiment of this application provides an antenna downtilt adjustment apparatus installed inside an antenna apparatus. The antenna apparatus is usually installed on a pole or a tower, and is communicatively connected to a base station. In a network, the base station is a part that connects a terminal to a wireless network, and may also be referred to as a radio access network (Radio Access Network, RAN) node, or a node or device that connects a terminal to a wireless network. The base station described in this application may also be another radio access network node, for example, a transmission reception point (Transmission Reception Point, TRP), an evolved NodeB (evolved Node B, eNB), a radio network controller (radio network controller, RNC), a node B (Node B, NB), a base station controller (Base Station Controller, BSC), a home base station (for example, Home evolved NodeB or Home Node B, HNB), a baseband unit (BaseBand Unit, BBU), or a Wi-Fi access point (Access Point, AP).

As shown inFIG. 1, an antenna downtilt adjustment apparatus is provided, including: an antenna information management module10, a first transmission assembly20, a flexible transmission assembly30, a second transmission assembly40, and a phase shifter50. The antenna information management module10is communicatively connected to a base station, and is configured to receive a control signal from the base station (for example, a signal sent by the base station indicates setting an antenna downtilt to 2 degrees) and drive the first transmission assembly20according to the control signal, so that the first transmission assembly20drives the flexible transmission assembly30to move. The flexible transmission assembly30transmits a force to the second transmission assembly40, to further drive the phase shifter50to work. The phase shifter50is connected to an antenna, and the phase shifter50is configured to change the antenna downtilt (for example, adjusting the antenna downtilt to 2 degrees by using the phase shifter50). At the same time, the antenna information management module10reports information about the antenna downtilt to the base station. The antenna information management module10stores a correspondence between a position of each second transmission assembly40and a downtilt. Specifically, the antenna information management module10may include a plurality of pairs of connectors, configured to be communicatively connected to a plurality of base stations. There may be a plurality of phase shifters50. Therefore, the antenna downtilt adjustment apparatus provided in this embodiment of this application may adjust a plurality of antennas. Correspondingly, there may also be a plurality of flexible transmission assemblies30, to drive the plurality of phase shifters50to move. One flexible transmission assembly30may also simultaneously drive two or more phase shifters50.

The antenna downtilt adjustment apparatus includes a mounting plate101disposed in a housing (such as an antenna radome). In an embodiment, an antenna, specifically, a radiating element of the antenna is disposed on one side (side A) of the mounting plate101. A transceiver circuit or a feeding circuit of the antenna may be disposed on another side (side B) of the mounting plate101. The antenna information management module10, the first transmission assembly20, the flexible transmission assembly30, the second transmission assembly40, and the phase shifter50may be disposed on the side B of the mounting plate101. The side A and the side B are two sides or two facets of the mounting plate. The antenna information management module10and the phase shifter50are located on the side B of the mounting plate101and each are close to one of two opposite ends of the mounting plate101. The phase shifter50is connected to the radiating element of the antenna on the side A of the mounting plate101. The phase shifter50is configured to adjust the antenna downtilt.

In an implementation, the mounting plate101is of a metal plate structure, to serve as a reflector of the antenna. In an implementation, the mounting plate101is an insulation plate, and a surface of one side of the mounting plate101on which the antenna is disposed is coated with a reflection layer (such as a metal layer), to reflect an antenna signal. In this case, the insulation plate can isolate apparatuses (such as the antenna information management module10, the first transmission assembly20, the flexible transmission assembly30, the second transmission assembly40, and the phase shifter50) disposed on the other side of the antenna from the antenna, to ensure an effect of receiving and sending a signal by the antenna.

FIG. 2schematically depicts a disposition architecture of the flexible transmission assembly30on the mounting plate101. The flexible transmission assembly30provided in this embodiment of this application includes a transmission element32and a guiding element34. The transmission element32is in an integrated long strip shape, and the transmission element32is bendable. One end of the transmission element32mates with the first transmission assembly20, and the other end of the transmission element32mates with the second transmission assembly40. The transmission element32is connected between the first transmission assembly20and the second transmission assembly40. Because the transmission element32is bendable, an extension path of the transmission element32on the mounting plate101is more flexible. The transmission element32may be flexibly disposed depending on a specific space of the mounting plate101. If a position needs to be avoided, the transmission element32only needs to be bent. The extension path of the transmission element32on the mounting plate101is constrained by using the guiding element34. To be specific, the guiding element34is configured to secure the transmission element32on the mounting plate101, and guide the transmission element32. The guiding element34is disposed at a position at which the transmission element32is bent, so that the transmission element32changes an extension direction after passing through the guiding element34. There may be one, two, or more guiding elements34. An extending part of the guiding element34between the guiding elements34(or between the guiding element34and the two ends of the transmission element32) may be in a straight line shape.

In an implementation, the transmission element32is a steel rope, and the transmission element32that is in a form of a steel rope can transmit push and pull forces. The steel rope is bendable when a force is applied in a direction perpendicular to a length direction of the steel rope. If a push force or a pull force is applied to one end of the steel rope e, the steel rope can transmit the force from one end to the other end.

In another implementation, the transmission element32is a flexible core shaft, and is configured to transmit a rotational force. The flexible core shaft is easy to bend. After the guiding element34constraints an extension path of the flexible core shaft, a rotational force is applied to one end of the flexible core shaft, to enable the flexible core shaft to rotate. The flexible core shaft transmits a rotational force from one end to the other end, and therefore the other end of the flexible core shaft also rotates.

When the mounting plate101is a metal plate, an isolation component is disposed between the transmission element32and the mounting plate101, to isolate the transmission element32from the mounting plate101. In an embodiment, an insulation layer may be disposed on a surface of the mounting plate101on which the transmission element32is disposed. In another embodiment, an outer surface of the transmission element32is set to be insulated. Specifically, the transmission element32includes a transmission component and an insulated sleeve wrapped around a periphery of the transmission component. To ensure strength of the transmission component, the transmission component is made of a metal material. The insulated sleeve is wrapped around the periphery of the transmission component, to insulate the transmission component from the mounting plate101, and can also isolate the transmission element32from another element (such as a component of an antenna) on the mounting plate101, to reduce intermodulation (such as passive intermodulation, also referred to as intermodulation distortion, caused by nonlinear characteristics of passive components in a radio frequency system).

FIG. 3andFIG. 4show two guiding elements34of different structures. The guiding element34includes a securing part341, a connecting part342, and a mating part343. The securing part341is configured to be securely connected to the mounting plate101, the connecting part342is connected between the securing part341and the mating part343, and the mating part343is configured to mate with the transmission element32, to guide and support installation of the transmission element32on the mounting plate101. The guiding element34may be made of a metal material, or may be made of a plastic material. A vibration may be generated during a working process of the transmission element32. The mating part343is in direct contact with the transmission element32, and is greatly affected by the vibration. The vibration may be transmitted to the connecting part342, and the connecting part342can absorb a part of the vibration, thereby reducing impact of the vibration on the securing part341. In other words, impact of the vibration on the mounting plate101is reduced. The antenna is disposed on the mounting plate101, and the connection part342absorbs a part of the vibration. This reduces impact of the vibration generated on the antenna during the working process of the transmission element32, thereby ensuring antenna performance.

Specifically, a through hole3421is provided in the connection part342, and the through hole3421is provided between the mating part343and the securing part341. The provision of the through hole3421is conducive to increasing elasticity of the connecting part342and increasing isolation between the mating part343and the securing part341. In this way, the connecting part342absorbs more vibrations and reduces impact of a motion of the transmission element32on the mounting plate101. As shown inFIG. 3andFIG. 4, with the provision of the through hole3421, the connecting part342serves as a rib connected between the securing part341and the mating part343. A shape of the through hole3421is not limited herein.

In an implementation, materials of the mating part343and the securing part341are rigid, to implement stability of a connection between the mating part343and the transmission element32and stability of a connection between the securing part341and the mounting plate101. A material of the connecting part342is a material having a buffer function, for example, silica gel. An effect of absorbing the vibration generated by the transmission element32of the connecting part342is enhanced by selecting the material.

The mating part343may be of a sleeve structure or a gripping jaw structure. Both the mating part343shown inFIG. 3and the mating part343shown inFIG. 4are of the sleeve structure. Specifically, a through hole3432is provided in the mating part343, and the transmission element32passes through the through hole3432. For ease of installation, a size of the through hole3432is greater than a peripheral size of the transmission element32, so that the transmission element32easily passes through the through hole3432. The gripping jaw structure may be understood as a pair of oppositely disposed gripping jaws disposed on the mating part. Clamping space is formed between the pair of gripping jaws. The transmission element32is clamped into the clamping space from an opening of the pair of gripping jaws, and the transmission element32is secured by a clamping force of the pair of gripping jaws. Specifically, the pair of gripping jaws secures the insulated sleeve of the transmission element32, and the transmission component disposed in the insulated sleeve can be moved and rotated in the insulated sleeve.

The securing part341of the guiding element34shown inFIG. 3is of a snap-fit structure. The guiding element34is installed on the mounting plate101through mating of a snap and a hook on the mounting plate101. The securing part341of the guiding element34shown inFIG. 4is of a screw assembly structure. A pair of screw holes is provided on the securing part341, and the guiding element34is secured to the mounting plate101by screwing bolts into the pair of screw holes.

FIG. 5shows an internal structure of the antenna information management module10. A control plate12and a communications interface14and a motor16that are electrically connected to the control plate12are disposed in the antenna information management module10. The communications interface14is configured to be communicatively connected to a base station, to receive a control signal from the base station. A main control device (such as an RRU, namely, Remote Radio Unit, remote radio unit) of a mobile base station is connected to the communications interface14by using a cable assembly, and the communications interface14of the antenna information management module10may be an AISG connector. The control plate12drives the motor16to work after processing the control signal. The motor16includes a first motor162and a second motor164. Both the first motor162and the second motor164are connected to the first transmission assembly20by using a mechanical structure disposed on a shaft end of the motor, to drive the first transmission assembly20to move.

FIG. 6Ais a schematic structural diagram of the first transmission assembly20. The first transmission assembly20includes a first shaft21and a second shaft22. The first shaft21and the second shaft22are connected to the first motor162and the second motor164, respectively. Motor interfaces are disposed at an end of the first shaft21and an end of the second shaft22, and the motor interfaces are configured to plug in and mate with transfer interfaces of the first motor162and the second motor164, to accept a force from the antenna information management module10.

The first transmission assembly20is connected to the transmission element32, to drive the transmission element32to move in a straight line or rotate. In an implementation, the first transmission assembly20further includes a plurality of transmission screws23, and each transmission screw23is connected to one transmission element32. A force connection is formed between the motor interface and the transmission screw23by using a transmission shaft (namely, the first shaft21) and a gear assembly. Referring toFIG. 6AandFIG. 6B, specifically, the gear assembly includes a planetary carrier gear24, a planetary gear25, and a plurality of transmission gears26. A first gear212that meshes with the planetary gear25is disposed on the first shaft21, and the planetary carrier gear24is also disposed on the first shaft21. The planetary carrier gear24shares a shaft with the first gear212. InFIG. 6A, the first gear212is obscured by the planetary carrier gear24, while inFIG. 6B, the planetary carrier gear24is hidden, and the first gear212is visible. Rotation of the first shaft21drives the first gear212and the planetary carrier gear24to rotate. The planetary gear25is secured to the planetary carrier gear24by using a rotation center shaft252. In a process in which the first shaft21drives the planetary carrier gear24to rotate, the rotation center shaft252follows rotation of the planetary carrier gear24, so that the planetary gear25revolves. At the same time, the first gear212drives the planetary gear25to autorotate around the rotation center shaft252. Centering around the first shaft21, the plurality of transmission gears26are circularly disposed around a periphery of the planetary gear25. Rotation angles of the planetary gear25correspond to different transmission gears26. In this way, the planetary gear25meshes with different transmission gears26, to select different transmission gears26.

The transmission gears26are configured to drive the transmission screws23. The first transmission assembly20further includes a transmission nut27and a transmission guiding rod28that mate with the transmission screw23, and the transmission nut27is connected to the transmission guiding rod28. Rotation of the transmission screw23drives the transmission nut27to move in a straight line along the transmission guiding rod28. The transmission nut27is connected to the transmission element32, to drive the transmission element32to move in a straight line, so that the transmission element32transmits a straight pull force between the first transmission assembly20and the second transmission assembly40.

In another implementation, the transmission screw23may be directly connected to the transmission element32. In this way, rotation of the transmission screw23drives the transmission element32to rotate, so that the transmission element32transmits a rotational force between the first transmission assembly20and the second transmission assembly40.

In another implementation, the first transmission assembly20may not include the transmission screw23, the transmission nut27, and the transmission guiding rod28, and directly use rotation of the transmission gear26to drive the transmission element32to rotate.

A transmission relationship between the transmission element32and the second transmission assembly40may be: a push and pull straight line translation (as shown inFIG. 7), a rotational motion of the transmission element32being converted into a rotational motion of the second transmission assembly40(as shown inFIG. 10andFIG. 11), or a rotational motion of the transmission element32being converted into a straight line translation of the second transmission assembly40(as shown inFIG. 15). The following describes a specific architecture.

In an implementation, as shown inFIG. 7andFIG. 8, the second transmission assembly40is a straight pull rod. One end of the straight pull rod is secured to the transmission element32, and the other end is secured to the phase shifter50. The first transmission assembly20drives the transmission element32to move, to push or pull the straight pull rod. The second transmission assembly40is securely connected to the transmission element32by using a pull rod adapter41.

The antenna downtilt adjustment apparatus further includes a reset assembly80. The reset assembly80is elastically connected between the transmission element32and the second transmission assembly40. When the transmission element32drives the second transmission assembly40, the reset assembly80is elastically deformed, and when a reverse move or a return is needed, the reset assembly80provides a reset force for the transmission element32.

In the implementations shown inFIG. 7andFIG. 9, the transmission element32transmits a straight pull force. To be specific, when the second transmission assembly40is pulled or compressed by a straight line motion of the transmission element32, the reset assembly80is a reset mechanism in a straight line direction. Specifically, the reset assembly80includes a spring82and a securing block84, the securing block84is secured to the mounting plate101, and installation space is provided between the securing block84and the second transmission assembly30. The spring82is sleeved around a periphery of the transmission element32and is accommodated in the installation space. Reset is implemented by using a resilient force of the spring82. For example, if the motor16rotates in a forward direction to compress and stretch the spring and drive the phase shifter50to work, when the motor16rotates reversely, the transmission element32resets under the action of a spring force and also drives the phase shifter50to work in a reverse direction. One part of the transmission element32for sleeving of the spring82and the other part of the transmission element32may be of an integrated structure. Alternatively, a guiding rod321may be secured to one end of the transmission element32, and the spring82may be sleeved around a periphery of the guiding rod321. The guiding rod321may be designed as a telescopic rod. A length of the guiding rod321can be adjusted, and an elastic force of the spring may be adjusted by adjusting the length of the guiding rod321.

One end of the spring82is secured to the securing block84, and the other end of the spring82is secured to the second transmission assembly40or the transmission element32. In the implementation example shown inFIG. 9, the other end of the spring82is secured to the pull rod adapter41of the second transmission assembly40. Because the transmission element32and the second transmission assembly40are synchronously moved, a reset function may also be implemented when the spring82is secured to the transmission element32. In a process in which the transmission element32drives the second transmission assembly40to move in a straight line relative to the securing block84, the spring82is compressed or stretched.

In another implementation, if the transmission element32transmits a rotational force, in other words, if rotation of the transmission element32drives rotation of the second transmission assembly40, the reset assembly80may be a reset mechanism in a rotation direction. Specifically, the reset assembly80may include a torsional spring (instead of the spring, to implement a resilient force in the rotation direction) and a securing block84. The securing block84is secured to the mounting plate101. One end of the torsional spring is secured to the securing block84, and the other end of the torsional spring is secured to the second transmission assembly40or the transmission element32. In a process in which the transmission element32drives the second transmission assembly40to rotate relative to the secured block84, the torsional spring is elastically deformed.

In an implementation, as shown inFIG. 10,FIG. 11, andFIG. 12, the first transmission assembly20drives the transmission element32to rotate. The second transmission assembly40includes a worm and worm wheel assembly. A rotational motion of the transmission element32drives a rotational motion of a worm42of the second transmission assembly40. The worm wheel44is driven to rotate through mating of the worm42and a worm wheel44, and then the phase shifter50is driven to rotate and adjust the antenna downtilt. The transmission element32and the worm42may be secured by welding. As shown inFIG. 11, the two phase shifters50may be connected in series to one end of a same transmission element32. The two phase shifts50may be connected in series by using a flexible transmission element similar to the transmission element32.

As shown inFIG. 11, at least two phase shifters50, at least two second transmission assemblies40, and at least two transmission elements32are disposed in a one-to-one correspondence. To be specific, each second transmission assembly40is connected between one transmission element32and one phase shifter50, to form at least two transmission paths that are connected in parallel. A combiner module70is disposed between the at least two transmission elements32and the first transmission assembly20, and the combiner module70is configured to implement conversion between the first transmission assembly20and the at least two transmission elements32.

Specifically, as shown inFIG. 13andFIG. 14, the combiner module70includes one input shaft71and at least two output shafts72. The input shaft71is connected to the first transmission assembly20, and the at least two output shafts72are separately connected to the at least two transmission elements32. A force between the input shaft71and the at least two output shafts72is transmitted by using a gear. As shown inFIG. 14, an input gear712is disposed on the input shaft71, an output gear722is disposed on each output shaft72, and conversion between the first transmission assembly20and the two transmission elements32is implemented through simultaneous meshing of the input gear712and the two output gears722. If there are more than two transmission elements32, a planetary carrier and a planetary gear may be disposed in the combiner module70. Conversion between the first transmission assembly20and a plurality of transmission elements32may be implemented through mating of a plurality of planetary gears and a sun gear connected to the input shaft71.

As shown inFIG. 15, the second transmission assembly40is a push and pull rod, and can translate in a straight line. A conversion assembly46is disposed between the second transmission assembly40and the transmission element32. The first transmission assembly20drives the transmission element32to rotate, and the conversion assembly46converts a rotational motion of the transmission element32into a direct motion, to drive the second transmission assembly40to move in a straight line. Specifically, as shown inFIG. 16, the conversion assembly46includes a worm wheel462, a worm464, a gear466, and a gear rack468. The worm464is connected to the transmission element32, the gear rack468is connected to the second transmission assembly40, and the worm wheel462shares a shaft with the gear466. The transmission element32drives the worm464to rotate, drives the gear466to rotate through mating of the worm464and the worm wheel462and synchronous rotation of the worm wheel462and the gear466, and drives the second transmission assembly40to move in a straight line through mating of the gear466and the gear rack468.

In an implementation, the transmission element32can be simultaneously connected to at least two second transmission assemblies40. There are at least two phase shifters50and at least two second transmission assemblies40, and the at least two phase shifters50and the at least two second transmission assemblies40are disposed in a one-to-one correspondence. To be specific, each second transmission assembly40drives one phase shifter50.