Piezoelectric driving device, antenna and base station

Abstract

The invention provides a piezoelectric driving device, an antenna and a base station, and relates to the technical field of communication. The piezoelectric driving device provided by the invention is used for the phase shifter. The piezoelectric driving device comprises a device fixing frame, a resonance assembly, a forward pre-pressing assembly and a driven piece, wherein the device fixing frame is used for being connected with a frame. The resonance assembly is connected with the device fixing frame and comprises a metal elastic body and a piezoelectric material layer, the piezoelectric material layer is arranged on at least one surface of the metal elastic body, and the metal elastic body comprises a driving foot. The driven part is located on the side, facing the frame, of the device fixing frame, and the forward pre-pressing assembly is used for pressing the driving foot of the metal elastic body to the driven part under the action of elastic force. In this way, the high-frequency microcosmic motion of the resonance assembly can be converted into the macroscopic displacement of the driven part, so that the driving foot drives the driven part to move relative to the device fixing frame. The piezoelectric driving device directly outputs the driving force meeting the movement requirement, so that the occupied space is small, and the miniaturization design requirement of the antenna is met.

Description

Technical Field

[0001] The present application relates to the field of communication technologies, and particularly to a piezoelectric driving device, an antenna, and a base station. Background Art

[0002] With the development of mobile communication, the usage rate of mobile terminals is getting higher and higher, and the network coverage of mobile cellular networks is the key to mobile communication. Since the key device in a mobile cellular network is an antenna, in order to meet different network coverages, the antenna usually adopts an electrical tuning system to adjust the signal coverage range. Currently, in order to change the coverage range of the antenna and optimize the signal coverage area of the antenna, it is generally achieved by changing the signal radiation inclination angle of the antenna. The adjustment of the signal radiation inclination angle of the antenna is usually to change the phase distribution of the antenna array through a phase shifter to adjust the radiation pattern of the antenna, so as to achieve the purpose of adjusting the signal coverage range.

[0003] The phase shifter can drive the movement of its medium through a power mechanism to change the relative position between the medium and the strip line, thereby changing the dielectric constant on the signal transmission path in the phase shifter. In this way, when the signal of the antenna passes through the phase shifter, it can cause a certain phase delay or advance in the transmission of the signal of the antenna, so as to achieve the directional adjustment of the radiation direction of the signal of the antenna. However, the current power mechanism used for the phase shifter is large in size and weight, and it cannot meet the development requirements of antenna miniaturization and lightweight. Summary of the Invention

[0004] The present application provides a piezoelectric driving device, an antenna, and a base station to achieve the miniaturization and lightweight design of the antenna.

[0005] In a first aspect, the present application provides a piezoelectric driving device, which can be used in a phase shifter. When the piezoelectric driving device is specifically arranged, it includes a device fixing frame, a resonance component, a forward preloading component, and a follower. The device fixing frame is used to connect with the frame of the phase shifter, so that the device fixing frame plays a supporting role for other structures of the piezoelectric driving device. In addition, the resonance component is arranged on the device fixing frame, and the resonance component includes a metal elastic body and a piezoelectric material layer. The piezoelectric material layer is arranged on at least one surface of the metal elastic body, and the metal elastic body includes a driving foot. The follower is located on one side of the resonance component facing the frame, and the forward preloading component is used to press the driving foot of the metal elastic body against the follower under the action of elastic force. The driving foot is used to drive the follower to move relative to the device fixing frame. By using the piezoelectric driving device provided by the present application, the microscopic movement of the resonance component can be directly converted into the macroscopic movement of the follower, and the intermediate transmission mechanism is omitted, so that the structure of the piezoelectric driving device is relatively simple, the volume is small, and the weight is light. In addition, since no magnetic structure member is provided in the piezoelectric driving device, when it is used in an antenna, it can effectively avoid interfering with the signal of the antenna, thereby being beneficial to improving the signal radiation performance of the antenna.

[0006] The specific setting method of the piezoelectric driving device provided by the present application can be various. In a possible implementation manner, the metal elastic body includes a first surface and a second surface arranged opposite to each other, and the second surface faces the device fixing frame. The resonance component includes two piezoelectric material layers, and the two piezoelectric material layers are arranged on the first surface of the metal elastic body and are arranged adjacent to each other. In addition, the driving foot is arranged on the second surface of the metal elastic body, and the driving foot protrudes from the second surface in the direction from the first surface to the second surface. This facilitates the contact between the driving foot and the follower. When there is a certain phase difference between the high-frequency voltages of the two piezoelectric material layers applied to the first surface of the metal elastic body, the metal elastic body can form a certain regular microscopic elliptical movement, thereby driving the driving foot to move synchronously, and further driving the follower to move relative to the device fixing frame.

[0007] In a possible implementation manner of the present application, the piezoelectric driving device further includes a resonance component support and a resonance component fixing frame. The resonance component fixing frame is located between the device fixing frame and the resonance component support. Among them, the resonance component fixing frame is connected to the device fixing frame, and the resonance component fixing frame includes an installation groove. The metal elastic body is connected to the resonance component support, and the resonance component support is installed in the installation groove. Such a setting can be beneficial to improving the structural reliability of the resonance component.

[0008] In this application, in order to avoid interfering with the movement of the resonant component, the resonant component bracket is not rigidly connected to the resonant component fixing bracket. Instead, the resonant component bracket is lapped on the side of the resonant component fixing bracket that faces away from the device fixing bracket. Additionally, the piezoelectric driving device further includes a lateral preloading component. Along the arrangement direction of the two piezoelectric material layers, the lateral preloading component is located between the end of the resonant component bracket and the wall of the installation groove. The lateral preloading component includes a lateral preloading elastic member and a first rolling member. One end of the lateral preloading elastic member abuts against the wall of the installation groove, and the other end of the lateral preloading elastic member presses the first rolling member against the end of the resonant component bracket. Thus, under the elastic force of the lateral preloading elastic member, the first rolling member is pressed against the end of the resonant component bracket. This can limit the movement of the resonant component bracket in the direction along the arrangement of the two piezoelectric material layers during the movement of the resonant component bracket along with the metal elastic body, thereby preventing the resonant component bracket from moving erratically in this direction. Also, since the end of the resonant component bracket abuts against the first rolling member, the setting of the lateral preloading component will not affect the movement of the resonant component bracket along with the metal elastic body. Therefore, by providing a lateral preloading component between the resonant component bracket and the wall of the installation groove, the movement stability of the resonant component bracket can be effectively improved, thereby enhancing the movement stability of the resonant component, which is beneficial to improving the stability of the driving force output by the resonant component through the driving feet.

[0009] In a possible implementation manner of this application, the follower is located between the resonant component and the device fixing bracket. The surface of the follower facing the resonant component abuts against the driving feet of the resonant component, so that the driving feet apply a driving force to the follower.

[0010] To increase the friction between the driving feet and the follower, the piezoelectric driving device further includes a friction member. The friction member is connected to the surface of the follower facing the resonant component, and the driving feet abut against the friction member. By increasing the friction between the driving feet and the follower, the transmission efficiency of the driving force from the driving feet to the follower can be effectively improved, which is beneficial to reducing the power consumption of the piezoelectric driving device.

[0011] In a possible implementation manner of this application, the piezoelectric driving device further includes a second rolling member. The second rolling member is located between the follower and the device fixing bracket. Both the follower and the device fixing bracket abut against the surface of the second rolling member. In this way, during the movement of the follower relative to the device fixing bracket, the friction pair between the follower and the device fixing bracket is a rolling friction pair, which can make the resistance of the relative movement between the follower and the device fixing bracket smaller, thus being beneficial to reducing the power consumption of the piezoelectric driving device.

[0012] To improve the movement reliability of the second rolling member, at least one of the device fixing bracket and the follower may further be provided with a limiting groove, and at least a part of the second rolling member is received in the limiting groove to limit the second rolling member in the limiting groove.

[0013] In a possible implementation of the present application, in order to enable the forward preloading component to apply an elastic force to the resonant component, the piezoelectric driving device further includes a cover plate, and the cover plate is connected to the resonant component fixing frame. The forward preloading component is located between the resonant component and the cover plate, and the forward preloading component abuts against the cover plate and the resonant component, so that the forward preloading component is pressed against the resonant component by the connecting force between the cover plate and the resonant component fixing frame.

[0014] When specifically setting the forward preloading component, it may include a forward preloading elastic member and a pressing plate. The forward preloading elastic member is located between the pressing plate and the cover plate, and the forward preloading elastic member abuts against the cover plate and the pressing plate. In addition, the pressing plate abuts against the resonant component. This can improve the uniformity and stability of the elastic force applied by the forward preloading elastic member to the resonant component.

[0015] In a possible implementation of the present application, the piezoelectric driving device further includes a buffer pad, and the buffer pad is located between the forward preloading component and the resonant component. This can effectively prevent the forward preloading component from squeezing and damaging the piezoelectric material layer, so as to improve the structural reliability of the piezoelectric driving device.

[0016] The resonant component of the piezoelectric driving device provided in the present application can also adopt other possible setting methods. For example, in a possible implementation, the metal elastic body is connected to the device fixing frame. At this time, the resonant component includes four piezoelectric material layers. Two of the four piezoelectric material layers are located on the first surface of the metal elastic body, and the other two of the four piezoelectric material layers are located on the second surface of the metal elastic body. Among them, the first surface and the second surface are two opposite surfaces of the metal elastic body. In addition, the metal elastic body includes a hollow area and two driving feet. The two piezoelectric material layers located on the same surface of the metal elastic body are respectively located on both sides of the hollow area, and the two piezoelectric material layers located on the first surface correspond to the two piezoelectric material layers located on the second surface one by one. The two driving feet are located on both sides of the hollow area, and the arrangement direction of the two driving feet intersects with the arrangement direction of the two piezoelectric material layers located on the same surface of the metal elastic body, and the two driving feet protrude from the corresponding side surfaces of the metal elastic body in a direction away from the hollow area. When the resonant component adopts the above design method, by applying the same voltage to the two piezoelectric material layers arranged on the same side surface of the metal elastic body, and there is a certain phase difference between the high-frequency voltages applied to the piezoelectric material layers on the two surfaces of the metal elastic body, the metal elastic body can form a certain regular microscopic elliptical motion, thereby driving the driving feet to move synchronously, and further enabling the driving feet to drive the driven member to move.

[0017] In a possible implementation manner of the present application, the piezoelectric driving device further includes a friction member, and the friction member is connected to the surface of the driven member facing the resonant assembly. Additionally, the friction member includes two friction plates disposed opposite to each other, a metal elastic body is located between the two friction plates, and the two driving feet are in one-to-one contact with the two friction plates respectively. This can effectively increase the friction force between the driving feet and the driven member, thereby effectively improving the transmission efficiency of the driving force from the driving feet to the driven member, which is beneficial to reducing the power consumption of the piezoelectric driving device.

[0018] In a possible implementation manner of the present application, the forward preloading assembly is connected to the surface of the driven member facing the resonant assembly, and the forward preloading assembly abuts against the surface of each friction plate facing away from the metal elastic body. In this way, under the elastic force of the forward preloading assembly, each friction plate can be pressed against the corresponding driving foot, and the extrusion force between the friction plate and the corresponding driving foot can be adjusted by adjusting the elastic force of the forward preloading assembly, thereby realizing the adjustment of the friction force between the friction plate and the corresponding driving foot.

[0019] When specifically setting the forward preloading assembly, it may include a claw-shaped spring piece, at least one elastic claw portion of the claw-shaped spring piece abuts against the surface of one friction plate facing away from the metal elastic body, and at least one elastic claw portion of the claw-shaped spring piece abuts against the surface of the other friction plate facing away from the metal elastic body. In this way, while the forward preloading assembly presses the friction plate against the driving foot, the structure of the forward preloading assembly can be relatively simple.

[0020] Another possible implementation manner of the present application also provides a setting method for the resonant assembly. Specifically, the metal elastic body of the resonant assembly is connected to the device fixing bracket, and the resonant assembly includes two piezoelectric material layers, and the two piezoelectric material layers are respectively disposed on two opposite surfaces of the metal elastic body. The resonant assembly further includes a driving shaft, the driving shaft passes through the two piezoelectric material layers and the metal elastic body, and the driving feet of the metal elastic body are connected to the driving shaft. Additionally, the driven member and the resonant assembly are located on the same side of the device fixing bracket, the device fixing bracket includes a first mounting portion and a second mounting portion disposed opposite to each other, and two ends of the driving shaft are respectively mounted on the first mounting portion and the second mounting portion. In order to transfer the microscopic movement generated by the resonant assembly to the driven member, the piezoelectric driving device further includes a friction member, the friction member is connected to the driven member, and the forward preloading assembly is used to press the friction member against the driving shaft under the action of the elastic force, so as to achieve the effect of squeezing the driven member and the driving shaft, and transfer the microscopic movement generated by the resonant assembly to the driven member through the driving shaft, thereby driving the driven member to move.

[0021] When specifically setting the friction member, the friction member includes two clamping portions, and one of the two clamping portions is connected to the driven member. Additionally, the driving shaft is located between the two clamping portions, and the forward preloading assembly is used to press the two clamping portions against the driving shaft under the action of the elastic force, so that the driven member is in reliable contact with the driving shaft.

[0022] In a possible implementation manner of the present application, the forward preloading component includes two reed pieces, and each reed piece is used to press the corresponding ends of the two clamping parts together. In this way, while the forward preloading component presses the driven member towards the driving shaft, the structure of the forward preloading component can be relatively simple.

[0023] In a second aspect, the present application further provides an antenna, which includes a phase shifter and the piezoelectric driving device of the first aspect. The phase shifter includes a frame, a medium and a strip line accommodated in the frame. The device fixing bracket of the piezoelectric driving device is connected to the frame, and the driven member is connected to the medium. In this antenna, when the piezoelectric driving device works, it can directly convert the microscopic movement of the resonant component into the macroscopic movement of the driven member, so that the driven member drives the medium of the phase shifter to move relative to the strip line, so as to achieve the purpose of changing the dielectric constant of the strip line. Since the piezoelectric driving device provided in the present application directly outputs the driving force in a piezoelectric driving manner, it omits the intermediate transmission mechanism, so that the structure of the piezoelectric driving device is relatively simple, the volume is small and the weight is light, which is beneficial to realizing the miniaturization and light weight design of the antenna. In addition, since no magnetic structure is provided in the piezoelectric driving device, when it is used in an antenna, interference to the signal of the antenna can be avoided, which is beneficial to improving the signal radiation performance of the antenna.

[0024] In a third aspect, the present application further provides a base station, which includes a radio frequency processing unit, a baseband processing unit and the antenna of the second aspect. The baseband processing unit is connected to the antenna through the radio frequency processing unit. The base station provided in the present application has better signal radiation performance. Description of the Drawings

[0025] Figure 1 It is a schematic diagram of a system architecture provided by an embodiment of the present application;

[0026] Figure 2 It is a schematic diagram of an application scenario of an antenna provided by an embodiment of the present application;

[0027] Figure 3 It is a schematic diagram of a structure of an antenna provided by an embodiment of the present application;

[0028] Figure 4 It is a schematic diagram of an assembled structure of a piezoelectric driving device and a phase shifter provided by an embodiment of the present application;

[0029] Figure 5 is Figure 4 The exploded structure schematic diagram of the piezoelectric driving device shown in;

[0030] Figure 6 is Figure 5 A schematic diagram of a structure of a resonant component of the piezoelectric driving device shown in;

[0031] Figure 7 It is Figure 6 a schematic structural diagram of the resonant component shown from another angle;

[0032] Figure 8 It is another schematic structural diagram of the resonant component provided by the embodiment of the present application;

[0033] Figure 9 It is Figure 5 a schematic connection diagram of the piezoelectric driving device and the phase shifter shown;

[0034] Figure 10 It is another schematic structural diagram of the piezoelectric driving device provided by the embodiment of the present application;

[0035] Figure 11 It is Figure 10 an exploded view of the piezoelectric driving device shown in

[0036] Figure 12 It is provided by the embodiment of the present application Figure 10 a schematic connection diagram of the piezoelectric driving device and the phase shifter shown;

[0037] Figure 13 It is another schematic structural diagram of the piezoelectric driving device provided by the embodiment of the present application;

[0038] Figure 14 It is Figure 13 a schematic structural diagram of the resonant component of the piezoelectric driving device shown;

[0039] Figure 15 It is Figure 13 an exploded view of the piezoelectric driving device shown;

[0040] Figure 16 It is provided by the embodiment of the present application Figure 13 a schematic connection diagram of the piezoelectric driving device and the phase shifter shown.

[0041] Reference numerals:

[0042] 1000 - Base station; 2000 - Terminal;

[0043] 100 - Antenna; 10 - Radome; 20 - Antenna connector; 30 - Radiation unit; 40 - Reflector; 50 - Adjusting unit; 5a - Power mechanism;

[0044] 5b - Calibration network; 60 - Phase shifter; 601 - Frame; 602 - Dielectric; 603 - Stripline;

[0045] 5 - Piezoelectric driving device; 501 - Device fixing bracket; 5011 - Guide groove; 5012 - Limit groove; 5013 - First mounting portion;

[0046] 50131 - First mounting hole; 5014 - Second mounting part; 50141 - Second mounting hole; 502 - Resonant component; 5021 - Metal elastomer;

[0047] 50211 - First surface; 50212 - Second surface; 50213 - Driving foot; 50214 - Hollow area; 5022 - Piezoelectric material layer; 5023 - Circuit board;

[0048] 5024 - Driving shaft; 503 - Resonant component bracket; 504 - Resonant component fixing bracket; 5041 - Mounting groove; 50411 - Lapping part;

[0049] 50412 - First groove wall; 50413 - Second groove wall; 505 - Lateral pre - pressing component; 5051 - Lateral pre - pressing elastic member; 5052 - First rolling member;

[0050] 506 - Driven member; 5061 - Slide block; 5062 - Protrusion; 5063 - Fixing bracket; 507 - Friction member; 5071 - Friction plate; 5072 - Clamping part;

[0051] 508 - Forward pre - pressing component; 5081 - Pre - pressing elastic member; 5082 - Pressure plate; 50821 - Accommodating groove; 509 - Buffer pad; 510 - Cover plate;

[0052] 511 - Second rolling member; 200 - Holding rod; 300 - RF processing unit; 400 - Baseband unit; 500 - Connecting wire; 600 - Adjusting bracket;

[0053] 700 - Grounding device. Detailed implementation manners

[0054] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Identical reference numerals in the drawings represent the same or similar structures, and thus repeated descriptions thereof will be omitted. The words expressing positions and directions described in the embodiments of the present application are all illustrated by taking the accompanying drawings as examples, but can be changed according to needs, and all the changes made are included in the protection scope of the present application. The accompanying drawings of the embodiments of the present application are only used to illustrate the relative position relationship, and they do not represent the true scale.

[0055] It should be noted that specific details are set forth in the following description to facilitate understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the connotation of the present application. Therefore, the present application is not limited by the specific implementation manners disclosed below.

[0056] To facilitate the understanding of the piezoelectric drive device, antenna, and base station provided in this application, the application scenarios thereof will be introduced first below. Figure 1 An exemplary schematic diagram of a system architecture applicable to the embodiments of this application is shown, such as Figure 1 As shown, the system architecture may include a base station 1000 and a terminal 2000. Wireless communication can be achieved between the base station 1000 and the terminal 2000. The base station 1000 can also be referred to as an access network device, which can be located in a base station subsystem (BBS), a UMTS terrestrial radio access network (UTRAN), or an evolved universal terrestrial radio access (E-UTRAN) for cell coverage of signals to enable communication between terminal devices and wireless networks. Specifically, the base station 1000 can be a base transceiver station (BTS) in a global system for mobile communication (GSM) or a code division multiple access (CDMA) system, or a Node B (NB) in a wideband code division multiple access (WCDMA) system, or an evolved Node B (eNB or eNodeB) in a long term evolution (LTE) system, or a radio controller in a cloud radio access network (CRAN) scenario. Or the base station 1000 can also be a relay station, an access point, a vehicle-mounted device, a wearable device, and a g node (gNodeB or gNB) in a new radio (NR) system, an access network device in a future evolved network, etc. The embodiments of this application do not limit this.

[0057] The base station 1000 is equipped with an antenna 100 to achieve signal transmission in space. Figure 2 Shows such as Figure 1 An application scenario schematic diagram of the antenna 100 equipped in the base station 1000 as shown. Figure 2Structures such as the guyed mast 200 and the antenna 100 are shown. The antenna 100 includes a radome 10. The antenna 100 is fixed to the guyed mast 200 or a tower through the radome 10, so as to facilitate the reception or transmission of signals by the antenna 100. The radome 10 has good electromagnetic wave penetration characteristics in terms of electrical performance and can withstand the influence of the external harsh environment in terms of mechanical performance, so as to protect the antenna system from the influence of the external environment.

[0058] The base station 1000 may further include a radio frequency processing unit 300 and a baseband processing unit 400. The antenna 100 is connected to the radio frequency processing unit 300 through an antenna connector 20 located outside the radome 10. The baseband processing unit 400 can be connected to the antenna 100 through the radio frequency processing unit 300. In some embodiments, the radio frequency processing unit 300 may also be referred to as a remote radio unit (RRU), and the baseband processing unit 400 may also be referred to as a baseband unit (BBU).

[0059] The guyed mast 200 is fixed to the ground and at a certain height from the ground. The antenna 100 is fixed to the guyed mast 200, which can meet the radiation distance requirement of the antenna 100. The antenna 100 is specifically detachably fixed to the guyed mast 200 through an adjustment bracket 600, so as to facilitate the reception or transmission of signals by the antenna 100. Along the direction perpendicular to the height of the guyed mast 200, the orientation of the antenna 100 can be adjusted through the adjustment bracket 600.

[0060] In a possible embodiment, as Figure 2 shown, the radio frequency processing unit 300 may be integrally provided with the antenna 100, and the baseband processing unit 400 is located at the far end of the antenna 100. At this time, the radio frequency processing unit 300 and the antenna 100 can be collectively referred to as an active antenna unit (AAU). It should be noted that Figure 2 this is only an example of the positional relationship between the radio frequency processing unit 300 and the antenna 100. In some other embodiments, the radio frequency processing unit 300 and the baseband processing unit 400 may also be located at the far end of the antenna 100 at the same time. The radio frequency processing unit 300 and the baseband processing unit 400 can be connected through a connecting wire 500.

[0061] A grounding device 700 is provided between the baseband processing unit 400 and the connection wire 500. The grounding device 700 generally includes a grounding electrode buried underground. A seal can be provided at the connection between the antenna 100 and the connection wire 500, and a seal can also be provided at the connection between the grounding device 700 and the connection wire 500. The seal can specifically include at least one of an insulating sealing tape and a polyvinyl chloride (PVC) insulating tape. Of course, the seal can also be of other structures and is not limited to the form of a tape.

[0062] Further, Figure 3 FIG. is a schematic structural diagram of the antenna 100 provided by an embodiment of the present application. As Figure 3 shown, the antenna 100 can include a radiation unit 30 and a reflector 40. Among them, the radiation unit 30 can also be referred to as an antenna element, an element, etc. The radiation unit 30 is a unit that constitutes the basic structure of an antenna array, and it can effectively radiate or receive antenna signals. The frequencies of different radiation units 30 can be the same or different. The reflector 40 can also be referred to as a bottom plate, an antenna panel, or a metal reflecting surface, etc. The reflector 40 can reflect and concentrate the received signal at the receiving point. The radiation unit 30 is usually placed on one side of the reflector 40, which can not only greatly enhance the signal receiving or transmitting ability but also block and shield the interference signals from the back of the reflector 40. Among them, in the present application, the back of the reflector 40 refers to the side of the reflector 40 opposite to the side where the radiation unit 30 is provided.

[0063] In the antenna 100, a feeding network is provided between the radiation unit 30 and the antenna connector 20. The feeding network can provide specific power and phase for the radiation unit 30. As Figure 3 shown, the feeding network can include an adjustment unit 50 and a phase shifter 60. The adjustment unit 50 is used to achieve different radiation beam directions, and the phase shifter 60 is used to change the maximum direction of signal radiation. By correspondingly adjusting the corresponding radiation unit 30 through the phase shifter 60, the electrical downtilt angle of the radiation signals of each radiation unit 30 can be changed, so as to change the radiation direction of each radiation unit 30 to meet the signal coverage requirements.

[0064] As Figure 3As shown, a functional module 70 may also be provided between the phase shifter 60 and the antenna connector 20. The functional module 70 can expand the performance of the antenna 100. Exemplarily, the functional module 70 may include one or a combination of at least two of a combiner, a power divider, a filter, and a microwave circuit. The combiner or the power divider can be used in the forward or reverse direction to divide a single signal into multiple signals or combine multiple signals into a single signal. The filter can be used to filter out interference signals. In some cases, the phase shifter 60 also has the function of a power divider or a combiner, and in this case, the power divider or the combiner can be omitted from the feed network. Different devices included in the feed network can be connected through transmission lines and connectors. It should be noted that the power divider or the combiner can be located inside or outside the radome 10, and the connection relationships between the various different components mentioned above are not unique, Figure 3 and only one possible positional relationship and connection method of each component are illustrated.

[0065] Reference may continue to Figure 3 , and the adjustment unit 50 may specifically include a power mechanism 5a and a calibration network 5b. The power mechanism 5a can drive the phase shifter 60 to change the pointing directions of different radiation beams of the antenna 100. The calibration network 5b sends a calibration signal to the power mechanism 5a to control the operation of the power mechanism 5a.

[0066] Among them, the principle of the power mechanism 5a driving the phase shifter 60 to change the pointing directions of different radiation beams of the antenna 100 is as follows: The power mechanism 5a drives the relative movement of the dielectric of the phase shifter 60 with respect to the strip line, thereby changing the relative position between the dielectric and the strip line. Since both the dielectric and the strip line of the phase shifter 60 are metal parts with a certain dielectric constant, when the relative position between the dielectric and the strip line changes, the dielectric constant of the strip line can be changed. And the strip line can be electrically connected to the radiation unit 30 of the antenna 100. By changing the dielectric constant of the strip line, the phase of the antenna signal passing through the strip line can be adjusted, thereby realizing the directivity adjustment of the radiation direction of the signal of the antenna 100.

[0067] Currently, the power mechanisms of traditional phase shifters mostly adopt a combination of a rotary motor and a rack and pinion to convert the rotary motion of the motor into a linear motion, so as to drive the relative linear movement of the dielectric of the phase shifter with respect to the strip line. However, the above-mentioned power mechanism is large in volume and weight, and its cost is high, and it cannot meet the current development requirements of miniaturization and lightweight of antennas.

[0068] In view of this, the present application adopts a piezoelectric drive device as the power mechanism of the phase shifter to drive the medium to move relative to the strip line, so as to convert the high-frequency microscopic motion of the resonant component of the piezoelectric drive device into the macroscopic displacement of the medium. Since the driving force directly output by the piezoelectric drive device meets the movement requirements of the medium, it omits the intermediate transmission mechanism, so the piezoelectric drive device occupies a small space, which is conducive to meeting the miniaturization design requirements of the antenna. And because the piezoelectric drive device is not provided with a magnetic structural part, when it is applied to the antenna, it can avoid interference with the antenna signal, thereby improving the signal radiation performance of the antenna and the base station using the piezoelectric drive device. In order to facilitate the understanding of the technical solution of the present application, the phase shifter provided by the present application will be specifically described in combination with the accompanying drawings and specific implementation methods.

[0069] Reference Figure 4 , Figure 4 The present invention provides a schematic diagram of an assembly structure of a piezoelectric drive device 5 and a phase shifter 60 , wherein the phase shifter 60 includes a frame 601 , and the piezoelectric drive device 5 is mounted on the frame 601 .

[0070] When the piezoelectric drive device 5 is specifically set, reference may be made to Figure 5 , Figure 5 for Figure 4 The exploded structural diagram of the piezoelectric drive device 5 is shown in FIG. The piezoelectric drive device 5 includes a device fixing frame 501 and a resonance component 502, and the ... Figure 4 and Figure 5 The device fixing frame 501 is used to be fixedly connected to the frame 601 of the phase shifter 60 , and can serve as a supporting component of the entire piezoelectric driving device 5 to support other structures of the piezoelectric driving device 5 .

[0071] You can continue to refer to Figure 5 The resonant component 502 is located on one side of the device fixing frame 501. Specifically, the resonant component 502 is located on the side of the device fixing frame 501 away from the frame 601 of the phase shifter 60. In this application, for the convenience of description, the arrangement direction of the resonant component 502 and the device fixing frame 501 can be defined as the Y direction.

[0072] Reference Figure 6 , Figure 6 for Figure 5A schematic structural diagram of the resonance component 502 of the piezoelectric driving device 5 shown in the figure. The resonance component 502 includes a metal elastic body 5021 and a piezoelectric material layer 5022. Among them, the material of the metal elastic body 5021 can be a metal material that is prone to deformation, such as stainless steel or phosphor bronze. The piezoelectric material layer 5022 can include a plurality of stacked piezoelectric ceramic layers. The piezoelectric material layer 5022 is disposed on at least one surface of the metal elastic body 5021, and the piezoelectric material layer 5022 can be connected to the surface of the metal elastic body 5021 by means of bonding or the like.

[0073] In the embodiment of the present application, the number of the piezoelectric material layers 5022 in the resonance component 502 is not limited, and it can be selected according to specific needs. For example, in Figure 6 the resonance component 502 shown in the figure, it includes two piezoelectric material layers 5022, and the two piezoelectric material layers 5022 are disposed on the first surface 50211 of the metal elastic body 5021. Among them, the first surface 50211 of the metal elastic body 5021 faces away from the device fixing bracket 501. In addition, in Figure 6 the resonance component 502 shown in the figure, the two piezoelectric material layers 5022 are arranged adjacent to each other. In the embodiment of the present application, for the convenience of description, the arrangement direction of the two piezoelectric material layers 5022 in the resonance component 502 shown in Figure 6 the figure can be defined as the X direction.

[0074] Refer to Figure 7 , Figure 7 For Figure 6 the schematic structural diagram of the resonance component 502 shown in the figure from another angle. The metal elastic body 5021 further includes a driving foot 50213. The driving foot 50213 is disposed on the second surface 50212 of the metal elastic body 5021, and the driving foot 50213 protrudes from the second surface 50212 along the direction from the first surface 50211 to the second surface 50212. Among them, the second surface 50212 of the metal elastic body 5021 is disposed opposite to the first surface 50211. In the present application, the number of the driving feet 50213 of the metal elastic body 5021 is not limited. Exemplarily, in Figure 7 the resonance component 502 shown in the figure, the number of the driving feet 50213 of the metal elastic body 5021 is two; or in Figure 8 the resonance component 502 shown in the figure, the number of the driving feet 50213 of the metal elastic body 5021 is one; or in other possible embodiments, the number of the driving feet 50213 of the metal elastic body 5021 can also be three, four or more.

[0075] In the present application, the metal elastomer 5021 may be an integrally formed structure, that is to say, the driving foot 50213 is a part of the metal elastomer 5021. The two have the same material and are obtained through a single processing technology to simplify the structure of the metal elastomer 5021 and improve production efficiency. Or the driving foot 50213 may be an independent structure, which can be fixed to the second surface 50212 of the metal elastomer 5021 by means of welding or bonding. At this time, the materials of the driving foot 50213 and the metal elastomer 5021 may be the same or different, which is beneficial to improving the setting flexibility of the driving foot 50213.

[0076] Reference may continue to Figure 5 , the resonant assembly 502 further includes a circuit board 5023. The circuit board 5023 may be disposed on the first surface 50211 of the metal elastomer 5021, or may be disposed on the second surface 50212 of the metal elastomer 5021, or may be disposed on the side surface of the metal elastomer 5021. The circuit board 5023 may be provided with a power supply module ( Figure 6 not shown in the figure). The power supply module is electrically connected to each piezoelectric material layer 5022 to supply power to each piezoelectric material layer 5022 through the power supply module. In the present application, the circuit board 5023 may be a flexible printed circuit (FPC) to improve the setting flexibility of the circuit board 5023. In this way, when there is a certain phase difference between the high-frequency voltages applied by the power supply module to the two piezoelectric material layers 5022 disposed on the first surface 50211 of the metal elastomer 5021, the metal elastomer 5021 can form a certain regular microscopic movement, thereby driving the synchronous movement of the driving foot 50213.

[0077] In Figure 5 the piezoelectric driving device 5 shown also includes a resonant assembly bracket 503 and a resonant assembly fixing bracket 504. Among them, the metal elastomer 5021 of the resonant assembly 502 is connected to the resonant assembly bracket 503, and the connection method may but is not limited to threaded connection, welding or riveting, etc.

[0078] The resonant assembly fixing bracket 504 is located between the device fixing bracket 501 and the resonant assembly bracket 503, and the resonant assembly fixing bracket 504 is fixedly connected to the device fixing bracket 501. The resonant assembly fixing bracket 504 includes an installation groove 5041. Along the arrangement direction of the resonant assembly fixing bracket 504 and the device fixing bracket 501, the installation groove 5041 penetrates through the resonant assembly fixing bracket 504. In addition, the installation groove 5041 is provided with a lapping portion 50411, and the lapping portion 50411 may be a convex structure provided on the groove wall of the installation groove 5041, and it extends into the interior of the installation groove 5041 along the groove wall of the installation groove 5041.

[0079] The resonant component bracket 503 is installed in the installation groove 5041 of the above-mentioned resonant component fixing bracket 504, and the resonant component bracket 503 overlaps on the side of the overlapping part 50411 away from the device fixing bracket 501. It is worth mentioning that in this application, there is no connection relationship between the resonant component bracket 503 and the resonant component fixing bracket 504. When the metal elastic body 5021 of the resonant component 502 makes a microscopic elliptical motion, the resonant component bracket 503 can be driven to move synchronously with the metal elastic body 5021. In addition, the resonant component bracket 503 can not only overlap on the overlapping part 50411 in the installation groove 5041, but also directly overlap on the side of the resonant component fixing bracket 504 away from the device fixing bracket 501 to simplify the structure of the piezoelectric driving device 5.

[0080] Continue to refer to Figure 5 , along the X direction, the installation groove 5041 includes a first groove wall 50412 and a second groove wall 50413 arranged oppositely, and a lateral preloading component 505 is arranged between the resonant component bracket 503 and at least one of the first groove wall 50412 and the second groove wall 50413.

[0081] In this application, the lateral preloading component 505 includes a lateral preloading elastic member 5051 and a first rolling member 5052. The lateral preloading elastic member 5051 can be, but is not limited to, elastic structural members such as a reed, a wave spring, a compression spring or a tension spring. Taking the lateral preloading component 505 being arranged between the resonant component bracket 503 and the first groove wall 50412 as an example, one end of the lateral preloading elastic member 5051 abuts against the first groove wall 50412, and the other end of the lateral preloading elastic member 5051 abuts against the first rolling member 5052, so that under the elastic force of the lateral preloading elastic member 5051, the first rolling member 5052 is pressed against the end of the resonant component bracket 503 facing the first groove wall 50412. In this way, during the movement of the resonant component bracket 503 with the metal elastic body 5021, the lateral preloading component 505 can limit the movement of the resonant component bracket 503 along the arrangement direction of the first groove wall 50412 and the second groove wall 50413, thereby preventing the resonant component bracket 503 from moving erratically in this direction. Also, since the end face of the resonant component bracket 503 facing the first groove wall 50412 abuts against the first rolling member 5052, the setting of the lateral preloading component 505 will not affect the movement of the resonant component bracket 503 with the metal elastic body 5021. Therefore, by arranging the lateral preloading component 505 between the resonant component bracket 503 and the first groove wall 50412, the movement stability of the resonant component bracket 503 can be effectively improved, thereby improving the movement stability of the resonant component 502, which is beneficial to improving the stability of the driving force output by the resonant component 502 through the driving foot 50213.

[0082] It can be understood that, in order to enable the first rolling member 5052 to stably contact the end of the resonant component bracket 503, a groove may be provided at the end of the resonant component bracket 503 facing the first groove wall 50412. At least a part of the first rolling member 5052 can be accommodated in the groove, and the side wall of the first rolling member 5052 fits against the groove wall, so that the first rolling member 5052 can roll relative to the groove.

[0083] In the embodiment of the present application, the first rolling member 5052 can be, for example, a roller. In addition, a lateral preloading component 505 may or may not be provided between the resonant component bracket 503 and the second groove wall 50413. When a lateral preloading component 505 is provided between the resonant component bracket 503 and the second groove wall 50413, it can be specifically set with reference to the above embodiments, and details are not described herein. Alternatively, only one first rolling member 5052 can be provided between the resonant component bracket 503 and the second groove wall 50413 to simplify the structure of the piezoelectric driving device 5 while improving the stability of the movement of the resonant component bracket 503.

[0084] The piezoelectric driving device 5 provided in the present application further includes a follower 506, which is used for medium connection with the phase shifter 60 to drive the medium to move relative to the strip line. In the present application, the driving force output by the driving foot 50213 of the resonant component 502 can act on the follower 506, thereby driving the follower 506 to move along a set trajectory such as a straight line or a curve. Specifically in implementation, reference can be continued to Figure 5 , along the Y direction, the follower 506 is located between the device fixing bracket 501 and the resonant component 502, and the surface of the follower 506 facing the resonant component 502 abuts against the driving foot 50213 of the resonant component 502, so that the follower 506 moves with the driving foot 50213 under the action of the frictional force between it and the driving foot 50213.

[0085] It is worth mentioning that, in the present application, by adjusting the voltage applied by the power supply module to the piezoelectric material layer 5022, the movement law of the metal elastic body 5021 and the driving foot 50213 can be adjusted, and further the movement trajectory of the follower 506 can be adjusted.

[0086] In addition, the circuit board 5023 of the resonant component 502 can also be provided with a displacement detection device ( Figure 5 not shown in the figure), which is used to calibrate the theoretically output movement displacement of the resonant component 502 with the actual displacement of the follower 506, and send the calibration result to the resonant component 502 to control the resonant component 502 to act according to the calibration result, thereby improving the driving accuracy of the piezoelectric driving device 5.

[0087] Since the friction between the follower 506 and the driving foot 50213 is the key to ensure the movement stability of the follower 506, in order to increase the friction between the follower 506 and the driving foot 50213, the piezoelectric driving device 5 provided in the present application also includes a friction member 507. Figure 5 In the piezoelectric driving device 5 shown, the friction member 507 is disposed on the surface of the driven member 506 facing the resonance component 502 , and the driving foot 50213 of the resonance component 502 can abut against the friction plate 5071 .

[0088] In the present application, the friction member 507 may be a metal sheet, and the friction member 507 is fixedly connected to the surface of the follower 506 facing the resonance component 502, and the connection method may be but is not limited to welding, bonding or clamping, etc. Alternatively, the friction member 507 and the follower 506 are an integrally formed structure, and the friction member 507 may be a portion of the surface of the follower 506 facing the resonance component 502 with a larger friction coefficient formed by a grinding process.

[0089] In addition, in order to make the driving foot 50213 of the resonance component 502 abut against the driven member 506, the piezoelectric driving device 5 provided in the embodiment of the present application further includes a positive preload component 508, which is located on the side of the resonance component 502 away from the device fixing bracket, and the positive preload component 508 presses the resonance component 502 toward the driven member 506 under the action of elastic force. Figure 5 As shown, the positive preload component 508 may include a positive preload elastic member 5081 and a pressure plate 5082. The positive preload elastic member 5081 may be located on a side of the pressure plate 5082 away from the resonance component 502, so that the positive preload elastic member 5081 presses the pressure plate 5082 toward the resonance component 502 under the action of elastic force, thereby pressing the resonance component 502 toward the follower 506. In the present application, the positive preload elastic member 5081 may be, but is not limited to, an elastic structural member such as a leaf spring, a wave spring, a compression spring, or a tension spring.

[0090] exist Figure 5 In the piezoelectric drive device 5 shown, a receiving groove 50821 may be further provided on the side of the pressure plate 5082 facing the positive preload elastic member 5081, and a portion of the positive preload elastic member 5081 may be received in the receiving groove 50821 of the pressure plate 5082 to improve the structural reliability of the positive preload component 508.

[0091] It is worth mentioning that in Figure 5In the piezoelectric driving device 5 shown, since the piezoelectric material layer 5022 is located on the side of the metal elastomer 5021 facing the forward preloading assembly 508, in order to prevent the forward preloading assembly 508 from damaging the piezoelectric material layer 5022, the piezoelectric driving device 5 may further include a buffer pad 509. The buffer pad 509 is located between the forward preloading assembly 508 and the resonant assembly 502, and the forward preloading assembly 508 presses the buffer pad 509 against the resonant assembly 502 under the action of elastic force. The present application does not limit the material of the buffer pad 509, and it can be an exemplary flexible material layer such as foam.

[0092] Reference can continue to be made to Figure 5 , the piezoelectric driving device 5 further includes a cover plate 510. The forward preloading assembly 508 is located between the cover plate 510 and the resonant assembly 502, and the cover plate 510 is fixedly connected to the resonant assembly fixing frame 504. The connection method can be but is not limited to threaded connection, so that the cover plate 510 and the resonant assembly fixing frame 504 are detachably connected, which is convenient for overhauling or replacing the resonant assembly 502. In some possible embodiments, the cover plate 510 and the resonant assembly fixing frame 504 can also be fixedly connected by welding, bonding or riveting, etc., to improve the connection reliability between the cover plate 510 and the resonant assembly fixing frame 504.

[0093] In addition, it can be understood that the forward preloading elastic member 5081 of the forward preloading assembly 508 is located between the cover plate 510 and the pressing plate 5082. The forward preloading elastic member 5081 can be abutted against the cover plate 510 and the pressing plate 5082, and the pressing plate 5082 is abutted against the resonant assembly 502. In this way, the forward preloading assembly 508 can be pressed against the resonant assembly 502 through the connection between the cover plate 510 and the resonant assembly fixing frame 504, so that the forward preloading assembly 508 applies a normal positive pressure to the resonant assembly 502, so that the forward preloading assembly 508 presses the driving foot of the resonant assembly 502 against the driven member 506.

[0094] As can be seen from the above introduction, the driven member 506 can move relative to the device fixing frame 501 under the drive of the resonant assembly 502. In order to improve the movement stability of the driven member 506, as Figure 5 shown, the device fixing frame 501 includes a guiding groove 5011. The specific shape of the guiding groove 5011 can be adjusted according to the movement trajectory of the driven member 506 relative to the device fixing frame 501. It can be an exemplary linear sliding groove, and the guiding groove 5011 extends along the X direction. In addition, the driven member 506 may further include a slider ( Figure 5 not shown in the figure). The slider can be located on the surface of the driven member 506 facing away from the resonant assembly 502. The slider can be inserted into the guiding groove 5011. Then, under the drive of the resonant assembly 502, the slider of the driven member 506 can slide along the guiding groove 5011.

[0095] To improve the smoothness of the movement of the follower 506 relative to the device fixing bracket 501, the piezoelectric drive device 5 provided in the embodiment of the present application further includes a second rolling member 511. The second rolling member 511 is located between the follower 506 and the device fixing bracket 501, and both the follower 506 and the device fixing bracket 501 are in contact with the surface of the second rolling member 511. In this way, during the movement of the follower 506 relative to the device fixing bracket 501, the friction pair between the follower 506 and the device fixing bracket 501 is a rolling friction pair, which can make the resistance of the relative movement between the follower 506 and the device fixing bracket 501 smaller, thus helping to reduce the power consumption of the piezoelectric drive device 5.

[0096] In the present application, the specific type of the second rolling member 511 is not limited, and it can be, for example, a roller or a ball. It can be understood that, in order to improve the movement reliability of the second rolling member 511, at least one of the device fixing bracket 501 and the follower 506 can also be provided with a limiting groove 5012. For example, in Figure 5 the device fixing bracket 501 is provided with a limiting groove 5012, and at least a part of the second rolling member 511 can be accommodated in the limiting groove 5012. In the embodiment of the present application, the device fixing bracket 501 and the follower 506 can also be both provided with a limiting groove 5012, and the limiting grooves 5012 of the two are arranged oppositely. In this way, a part of the second rolling member 511 is located in the limiting groove 5012 of the device fixing bracket 501, and a part of the second rolling member 511 is located in the limiting groove 5012 of the follower 506.

[0097] The present application does not limit the number of the second rolling members 511, and it can be, for example, two, three or more, and it can be specifically set according to the installation space between the device fixing bracket 501 and the follower 506. In addition, the present application does not limit the shape of the limiting groove 5012. Exemplarily, the cross-sectional shape of the limiting groove 5012 of the device fixing bracket 501 can be V-shaped or U-shaped, etc., and the cross-sectional shape of the limiting groove 5012 of the follower 506 can be V-shaped or U-shaped, etc., so as to prevent the second rolling member 511 from coming out between the device fixing bracket 501 and the follower 506.

[0098] In the present application, in order to facilitate the connection between the follower 506 and the medium 602 of the phase shifter 60, the guiding groove 5011 of the device fixing bracket 501 can be a through groove, that is, along the Y direction, the guiding groove 5011 penetrates the device fixing bracket 501. Refer to Figure 9 , Figure 9 For Figure 5Schematic diagram of the connection relationship between the piezoelectric driving device 5 and the phase shifter 60 shown. Among them, the dielectric 602 and the strip line 603 of the phase shifter 60 are accommodated in the frame 601. The device fixing bracket 501 of the piezoelectric driving device 5 is connected to the frame 601. One side of the driven member 506 of the piezoelectric driving device 5 facing away from the resonance assembly 502 is connected to the dielectric 602 of the phase shifter 60. Specifically, the slider 5061 inserted into the guiding groove 5011 of the driven member 506 can be used to connect to the dielectric 602 of the phase shifter 60, which is beneficial to improving the connection convenience between the piezoelectric driving device 5 and the phase shifter 60, and is beneficial to realizing the miniaturized design of the piezoelectric driving device 5, thereby reducing the space occupied by the piezoelectric driving device 5 in the antenna.

[0099] For the piezoelectric driving device 5 provided in the present application, by frictionally contacting the driving foot 50213 of the metal elastic body 5021 of the resonance assembly 502 with the driven member 506, the microscopic movement of the resonance assembly 502 is converted into the macroscopic movement of the driven member 506, so as to directly output the driving force that meets the movement requirements by using the piezoelectric driving method, which omits the intermediate transmission mechanism, making the structure of the piezoelectric driving device 5 relatively simple, with a smaller volume and lighter weight. In addition, since no magnetic structure member is provided in the piezoelectric driving device 5, when it is used in an antenna, interference with the signal of the antenna can be avoided, which is beneficial to improving the signal radiation performance of the antenna.

[0100] Based on the introduction of the driving principle of the piezoelectric driving device 5 provided in the above embodiments, a series of deformations can also be made to the specific structure of the piezoelectric driving device 5. Exemplarily, referring to Figure 10 , Figure 10 Another structural schematic diagram of the piezoelectric driving device 5 provided in the embodiment of the present application. Figure 10 The piezoelectric driving device 5 shown also mainly includes a device fixing bracket 501, a resonance assembly 502, a driven member 506, a positive preloading assembly 508 and a friction member 507. Among them, the device fixing bracket 501 is still fixedly connected to the frame 601 of the phase shifter 60 to serve as the support component of the entire piezoelectric driving device 5 to support other structures of the piezoelectric driving device 5.

[0101] The metal elastic body 5021 of the resonance assembly 502 is connected to one side surface of the device fixing bracket 501, and the connection method can be but is not limited to threaded connection or riveting, etc. In addition, as Figure 10 shown, the resonance assembly 502 and the driven member 506 can be separately arranged on both sides of the device fixing bracket 501. In some possible embodiments, the resonance assembly 502 can also be on the same side of the device fixing bracket 501 as the driven member 506.

[0102] In Figure 10In the piezoelectric driving device 5 shown, the metal elastic body 5021 includes a first surface 50211 and a second surface ( Figure 10 not shown in the figure) arranged back to back, wherein the first surface 50211 faces away from the device fixing bracket 501. The resonance assembly 502 includes four piezoelectric material layers 5022, and two of the four piezoelectric material layers 5022 are arranged on the first surface 50211 of the metal elastic body 5021, and the other two of the four piezoelectric material layers 5022 are arranged on the second surface of the metal elastic body 5021. Figure 10 Only the two piezoelectric material layers 5022 arranged on the first surface 50211 of the metal elastic body 5021 are shown. In this embodiment of the present application, the arrangement directions of the two piezoelectric material layers 5022 arranged on the first surface 50211 of the metal elastic body 5021 are the same as those of the two piezoelectric material layers 5022 arranged on the second surface of the metal elastic body 5021, and they are all arranged along the X direction.

[0103] In addition, refer to Figure 11 , Figure 11 is Figure 10 the exploded view of the piezoelectric driving device 5 shown in the figure. Among them, the metal elastic body 5021 includes a hollow area 50214, and the two piezoelectric material layers 5022 arranged on the first surface 50211 of the metal elastic body 5021 are respectively located on both sides of the hollow area 50214, and the two piezoelectric material layers 5022 arranged on the second surface 50212 of the metal elastic body 5021 are respectively located on both sides of the hollow area 50214.

[0104] In a possible embodiment of the present application, the two piezoelectric material layers 5022 arranged on the first surface 50211 of the metal elastic body 5021 and the two piezoelectric material layers 5022 arranged on the second surface 50212 of the metal elastic body 5021 can be arranged in one-to-one correspondence, so that the two piezoelectric material layers 5022 arranged on the first surface 50211 of the metal elastic body 5021 and the two piezoelectric material layers 5022 arranged on the second surface 50212 of the metal elastic body 5021 are symmetrically arranged with respect to the metal elastic body 5021, which is beneficial to the miniaturized design of the resonance assembly 502, and thus beneficial to the reduction of the volume of the piezoelectric driving device 5.

[0105] Continue to refer to Figure 5, there are two driving feet 50213 of the metal elastomer 5021. These two driving feet 50213 are located on both sides of the above-mentioned hollow area 50214. The arrangement direction of the two driving feet 50213 intersects with the arrangement direction of the two piezoelectric material layers 5022 provided on the same surface of the metal elastomer 5021. Exemplarily, the arrangement direction of the two driving feet 50213 is perpendicular to the arrangement direction of the two piezoelectric material layers 5022 provided on the same surface of the metal elastomer 5021. In addition, each driving foot 50213 protrudes from the corresponding side surface of the metal elastomer 5021 in a direction away from the hollow area 50214.

[0106] It is worth mentioning that in the present application, the metal elastomer 5021 can be an integrally formed metal sheet structure, which is beneficial to simplifying the structure of the resonance component 502, and thus can be beneficial to reducing the volume of the piezoelectric driving device 5. Or, the driving foot 50213 can be an independent structure, which can be fixed to the side surface of the metal elastomer 5021 by means such as welding or bonding. At this time, the materials of the driving foot 50213 and the metal elastomer 5021 can be the same or different, which is beneficial to improving the flexibility of setting the driving foot 50213.

[0107] As Figure 11 shown, the friction member 507 is located on the side of the driven member 506 facing the resonance component 502, and the friction member 507 is connected to the surface of the driven member 506 facing the resonance component 502. The connection method can be but is not limited to welding, bonding or snap connection, etc. In addition, the friction member 507 includes two relatively arranged friction plates 5071. Please refer to Figure 10 and Figure 11 , the metal elastomer 5021 is located between the two friction plates 5071, and the two driving feet 50213 are in one-to-one contact with the two friction plates 5071. In the piezoelectric driving device 5 shown in the present application Figure 11 , the surface of the driven member 506 facing the resonance component 502 may further include a fixing bracket 5063. The fixing bracket 5063 protrudes from the surface of the driven member 506 in the direction from the driven member 506 to the resonance component 502. Then, the two friction plates 5071 can be connected to the fixing bracket 5063, which can improve the connection convenience and reliability between the friction plates 5071 and the driven member 506.

[0108] It is worth mentioning that the fixing bracket 5063 and the driven member 506 can be an integrally formed structure to improve the integration of the piezoelectric driving device 5. Or, the fixing bracket 5063 and the driven member 506 can be detachably connected, which is beneficial to improving the flexibility of setting the fixing bracket 5063.

[0109] Please continue to refer to Figure 10 and Figure 11, the forward preloading assembly 508 is connected to the surface of the follower 506 facing the resonance assembly 502, and the connection method can be but is not limited to welding, bonding, clamping, etc. The forward preloading assembly 508 abuts against the surface of each friction plate 5071 facing away from the metal elastomer 5021, and the forward preloading assembly 508 can apply a normal positive pressure to each friction plate 5071, so that the forward preloading assembly 508 presses each friction plate 5071 against the corresponding driving foot 50213 under the action of elastic force.

[0110] It is worth mentioning that in the piezoelectric driving device 5 shown in the present application Figure 11 , the forward preloading assembly 508 may include a claw-shaped spring piece. At least one elastic claw portion of the claw-shaped spring piece abuts against the surface of a friction plate 5071 facing away from the metal elastomer 5021, and at least one elastic claw portion of the claw-shaped spring piece abuts against the surface of another friction plate 5071 facing away from the metal elastomer 5021, so as to apply a normal positive pressure to each friction plate 5071, thereby pressing each friction plate 5071 against the corresponding driving foot 50213. In addition, in order to increase the frictional force between the friction plate 5071 and the driving foot 50213, the extrusion force applied by the forward preloading assembly 508 to the friction plate 5071 can be increased. Specifically, in implementation, the forward preloading assembly 508 may include two or more claw-shaped spring pieces, and at least one elastic claw portion of each claw-shaped spring piece abuts against the surface of a friction plate 5071 facing away from the metal elastomer 5021, and at least one elastic claw portion of each claw-shaped spring piece abuts against the surface of another friction plate 5071 facing away from the metal elastomer 5021. In addition, two or more claw-shaped spring pieces of the forward preloading assembly 508 are detachably connected to improve the setting flexibility of the forward preloading assembly 508.

[0111] Figure 10 and Figure 11 The other structures of the piezoelectric driving device 5 shown can be set with reference to any of the above embodiments, and will not be elaborated here.

[0112] In Figure 10 and Figure 11In the piezoelectric driving device 5 shown, when the power supply module applies the same voltage to the two piezoelectric material layers 5022 disposed on the same side surface of the metal elastic body 5021, when there is a certain phase difference between the high-frequency voltages applied to the piezoelectric material layers 5022 disposed on the two surfaces of the metal elastic body 5021, the metal elastic body 5021 can form a regular microscopic elliptical motion, thereby driving the driving feet 50213 to move synchronously. Also, since each driving foot 50213 abuts against the corresponding friction plate 5071, under the frictional force between the driving foot 50213 and the corresponding friction plate 5071, the driving foot 50213 drives the friction plate 5071 to move along a set trajectory such as a straight line or a curve, so as to convert the microscopic motion of the resonant assembly 502 into the macroscopic motion of the friction plate 5071. Also, since the friction plate 5071 is connected to the driven member 506, the synchronous movement of the driven member 506 with the friction plate 5071 can be realized.

[0113] Referring to Figure 12 , Figure 12 is a schematic connection diagram of the piezoelectric driving device 5 provided in the embodiment of the present application Figure 10 shown and the phase shifter 60. Among them, the device fixing frame 501 is fixedly connected to the frame 601 of the phase shifter 60, and one side of the driven member 506 facing away from the resonant assembly 502 is connected to the dielectric 602 of the phase shifter 60. Then, during the operation of the piezoelectric driving device 5, the microscopic motion of the resonant assembly 502 can be directly converted into the macroscopic motion of the driven member 506, so that the driven member 506 drives the dielectric 602 of the phase shifter 60 to move relative to the strip line 603, so as to achieve the purpose of changing the dielectric constant of the strip line 603. Since the piezoelectric driving device 5 provided in the embodiment of the present application directly outputs a driving force that meets the motion requirements by using a piezoelectric driving method, it omits the intermediate transmission mechanism, so that the structure of the piezoelectric driving device 5 is relatively simple, the volume is small, and the weight is light. In addition, since no magnetic structure member is provided in the piezoelectric driving device 5, when it is used for an antenna, interference with the signal of the antenna can be avoided, which is beneficial to improving the signal radiation performance of the antenna.

[0114] Referring to Figure 13 , Figure 13 is another structural schematic diagram of the piezoelectric driving device 5 provided in the embodiment of the present application. In this piezoelectric driving device 5, the resonant assembly 502 further includes a driving shaft 5024 in addition to the metal elastic body 5021 and the piezoelectric material layer 5022. When the resonant assembly 502 is specifically arranged, it can refer to Figure 14 , Figure 14 is Figure 13Schematic structural diagram of the resonant component 502 of the piezoelectric driving device 5 shown. Among them, the resonant component 502 includes two piezoelectric material layers 5022. One of the piezoelectric material layers 5022 is disposed on the first surface 50211 of the metal elastic body 5021, and the other piezoelectric material layer 5022 is disposed on the second surface 50212 of the metal elastic body 5021. The drive shaft 5024 passes through the two piezoelectric material layers 5022 and the metal elastic body 5021, and the drive foot of the metal elastic body 5021 ( Figure 14 not shown in the figure) is connected to the drive shaft 5024, and the connection method can be but is not limited to bonding. In this way, the drive shaft 5024 can move synchronously with the drive foot, so the drive shaft 5024 can also be understood as the drive foot of the metal elastic body 5021.

[0115] In addition, referring to Figure 15 , Figure 15 is Figure 13 the exploded view of the piezoelectric driving device 5 shown. The resonant component 502 is located on one side of the device fixing frame 501. The device fixing frame 501 includes a first mounting portion 5013 and a second mounting portion 5014 which are oppositely arranged. The first mounting portion 5013 includes a first mounting hole 50131, and the second mounting portion 5014 includes a second mounting hole 50141. The drive shaft 5024 passes through the first mounting hole 50131 and the second mounting hole 50141 in sequence, so that both ends of the drive shaft 5024 are respectively mounted on the first mounting portion 5013 and the second mounting portion 5014. In addition, in the present application, the metal elastic body 5021 can be connected to the first mounting portion 5013 to realize the connection between the metal elastic body 5021 and the device fixing frame 501.

[0116] It can be understood that the two piezoelectric material layers 5022 are electrically connected to the power supply module disposed on the circuit board 5023. Then, when there is a certain phase difference between the high-frequency voltages applied to the two piezoelectric material layers 5022 disposed on the metal elastic body 5021 by the power supply module, the metal elastic body 5021 and the drive shaft 5024 are driven to form high-frequency vibrations.

[0117] Continue to refer to Figure 15 , in this piezoelectric driving device 5, the friction member 507 includes two clamping portions 5072. The two clamping portions 5072 are buckled and arranged on both sides of the drive shaft 5024, so that the drive shaft 5024 is clamped between the two clamping portions 5072. In this way, the friction member 507 can be driven to move linearly along the drive shaft 5024 under the drive of the high-frequency vibration output by the above-mentioned resonant component 502.

[0118] In addition, the positive preload assembly 508 can be used to apply positive pressure along the normal direction to the two clamping parts 5072 respectively, so as to press the two clamping parts 5072 toward the drive shaft 5024, that is, to press the friction member 507 toward the drive shaft 5024, so that the two clamping parts 5072 clamp the drive shaft 5024, thereby increasing the friction force between the clamping parts 5072 and the drive shaft 5024. In this embodiment of the present application, the positive preload assembly 508 may include two reeds, which are respectively located at two opposite ends of the friction member 507, and the two reeds are connected to the corresponding ends of the two clamping parts 5072, and the connection method thereof may be but is not limited to a threaded connection, so that each reed presses the corresponding ends of the two clamping parts 5072 together.

[0119] It is worth mentioning that in this embodiment of the present application, the number of the resonant components 502 is not limited, and the exemplary number may be: Figure 15 When there are two or more resonant components 502, the driving shaft 5024 of each resonant component 502 is clamped between the two clamping parts 5072 of the friction member 507, which is conducive to improving the stability of the movement of the friction member 507 and can effectively increase the driving force applied to the friction member 507, thereby improving the movement speed of the friction member 507.

[0120] Can be referred to together Figure 13 and Figure 15 The friction member 507 is located between the device fixing frame 501 and the driven member 506, and a protrusion 5062 is provided on the surface of the driven member 506 facing the friction member 507. In addition, the two clamping parts 5072 of the friction member 507 are arranged in the direction from the device fixing frame 501 to the driven member 506. For the convenience of description, the two clamping parts 5072 can be named as the first clamping part 5072 and the second clamping part 5072, respectively, wherein the first clamping part 5072 is closer to the driven member 506 than the second clamping part 5072, and the surface of the first clamping part 5072 facing the driven member 506 can be provided with a groove ( Figure 15 In this way, the protrusion 5062 of the driven member 506 can be inserted into the groove of the first clamping portion 5072, so that the first clamping portion 5072 and the driven member 506 are clamped, thereby realizing the clamping of the driven member 506 and the friction member 507, so that the friction member 507 can drive the driven member 506 to move therewith.

[0121] In some possible embodiments of the present application, a groove may be provided on the surface of the follower 506 facing the friction member 507, and a protrusion 5062 may be provided on the surface of the first clamping portion 5072 facing the follower 506, which may also realize the clamping connection between the follower 506 and the first clamping portion 5072. Of course, the follower 506 and the friction member 507 may also be connected in other possible ways, which are not introduced one by one here, but they should all be understood to fall within the protection scope of the present application. In addition, in another possible embodiment of the present application, the first clamping portion 5072 and the follower 506 may be an integrally formed structure, which is conducive to improving the movement consistency of the follower 506 and the friction member 507, thereby improving the driving accuracy of the resonance component 502 on the displacement of the follower 506, and further helping to improve the phase adjustment accuracy of the phase shifter 60 using the piezoelectric drive device 5.

[0122] Figure 13 The other structures of the piezoelectric driving device 5 shown can be arranged with reference to any of the above embodiments, and will not be described in detail here.

[0123] Reference Figure 16 , Figure 16 Provided in the embodiments of this application Figure 13 The schematic diagram of the connection relationship between the piezoelectric drive device 5 and the phase shifter 60 shown. Among them, the device fixing frame 501 is fixedly connected to the frame 601 of the phase shifter 60, and the side of the follower 506 that is away from the resonance component 502 is connected to the medium 602 of the phase shifter 60. Then, during the operation of the piezoelectric drive device 5, the microscopic motion of the resonance component 502 can be directly converted into the macroscopic motion of the follower 506, so that the follower 506 drives the medium 602 of the phase shifter 60 to move relative to the strip line 603, so as to achieve the purpose of changing the dielectric constant of the strip line 603. Since the piezoelectric drive device 5 provided in the embodiment of the present application adopts a piezoelectric drive method to directly output a driving force that meets the motion requirements, it omits the intermediate transmission mechanism, so that the structure of the piezoelectric drive device 5 is relatively simple, the volume is small and the weight is light. In addition, since no magnetic structural parts are provided in the piezoelectric drive device 5, when it is used for an antenna, interference with the antenna signal can be avoided, which is beneficial to improving the signal radiation performance of the antenna.

[0124] It is understandable that the above embodiments of the present application are only several exemplary descriptions of the specific configuration of the piezoelectric drive device 5 provided by the present application. Based on the above design principle of the piezoelectric drive device 5 provided by the present application, the adaptive deformation of the structure of the piezoelectric drive device 5 should be understood to be within the protection scope of the present application, and will not be introduced one by one here.

[0125] The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A piezoelectric driving device for a phase shifter, the phase shifter including a frame, characterized in that, The piezoelectric drive device comprises a device fixing frame, a resonance component, a positive preload component and a driven member, wherein the device fixing frame is used to be connected to the frame, wherein: The resonant component is arranged on the device fixing frame, the resonant component comprises a metal elastic body and a piezoelectric material layer, the piezoelectric material layer is arranged on at least one surface of the metal elastic body, and the metal elastic body comprises a driving foot; The follower is located on the side of the resonance component facing the frame, and the positive preload component is used to press the driving foot of the metal elastic body toward the follower under the action of elastic force, and the driving foot is used to drive the follower to move relative to the device fixing frame.

2. The piezoelectric driving device according to claim 1, wherein The metal elastic body comprises a first surface and a second surface which are arranged opposite to each other, and the second surface faces the device fixing frame; the resonant component comprises two piezoelectric material layers, the two piezoelectric material layers are arranged on the first surface of the metal elastic body, and the two piezoelectric material layers are arranged adjacent to each other; The driving foot is disposed on the second surface of the metal elastic body, and the driving foot protrudes from the second surface along a direction from the first surface to the second surface.

3. The piezoelectric drive device according to claim 2, characterized in that, The piezoelectric driving device also includes a resonance component bracket and a resonance component fixing frame, the resonance component fixing frame is located between the device fixing frame and the resonance component bracket; the resonance component fixing frame is connected to the device fixing frame, and the resonance component fixing frame includes a mounting groove; the metal elastomer is connected to the resonance component bracket, and the resonance component bracket is installed in the mounting groove.

4. The piezoelectric driving device according to claim 3, wherein The resonant component bracket is overlapped on a side of the resonant component fixing frame that is away from the device fixing frame; The piezoelectric drive device also includes a lateral pre-stress component, which is located between the end of the resonance component bracket and the groove wall of the mounting groove along the arrangement direction of the two piezoelectric material layers; the lateral pre-stress component includes a lateral pre-stress elastic member and a first rolling member, one end of the lateral pre-stress elastic member abuts against the groove wall of the mounting groove, and the other end of the lateral pre-stress elastic member presses the first rolling member toward the end of the resonance component bracket.

5. The piezoelectric driving device according to claim 3 or 4, characterized in that, The driven member is located between the resonance component and the device fixing frame, and the surface of the driven member facing the resonance component abuts against the driving foot of the resonance component.

6. The piezoelectric driving device according to claim 5, characterized in that, The piezoelectric driving device further comprises a friction member, wherein the friction member is connected to a surface of the driven member facing the resonance component, and the driving foot abuts against the friction member.

7. The piezoelectric driving device according to claim 5 or 6, characterized in that, The piezoelectric drive device further comprises a second rolling member, wherein the second rolling member is located between the driven member and the device fixing frame, and the driven member and the device fixing frame are both in contact with the surface of the second rolling member.

8. The piezoelectric driving device according to claim 7, characterized in that, At least one of the device fixing frame and the driven member is provided with a limiting groove, and at least a part of the second rolling member is accommodated in the limiting groove.

9. The piezoelectric driving device according to any one of claims 5 to 8, characterized in that, The piezoelectric drive device also includes a cover plate, which is connected to the resonant component fixing frame; the positive preload component is located between the resonant component and the cover plate, and the positive preload component is in contact with the cover plate and the resonant component.

10. The piezoelectric driving device according to claim 9, characterized in that, The forward preloading assembly includes a forward preloading elastic member and a pressing plate. The forward preloading elastic member is located between the pressing plate and the cover plate. The forward preloading elastic member abuts against the cover plate and the pressing plate, and the pressing plate abuts against the resonant assembly.

11. The piezoelectric driving device according to claim 9 or 10, characterized in that, The piezoelectric driving device further includes a buffer pad, and the buffer pad is located between the forward preloading assembly and the resonant assembly.

12. The piezoelectric driving device according to claim 1, wherein The metal elastic body is connected to the device fixing bracket; the resonant assembly includes four piezoelectric material layers. Two of the four piezoelectric material layers are located on the first surface of the metal elastic body, and the other two of the four piezoelectric material layers are located on the second surface of the metal elastic body. The first surface and the second surface are arranged in opposite directions. The metal elastic body includes a hollowed-out area and two driving feet. The two piezoelectric material layers located on the same surface of the metal elastic body are respectively located on both sides of the hollowed-out area, and the two piezoelectric material layers located on the first surface are arranged in one-to-one correspondence with the two piezoelectric material layers located on the second surface; the two driving feet are located on both sides of the hollowed-out area, and the arrangement direction of the two driving feet intersects with the arrangement direction of the two piezoelectric material layers located on the same surface of the metal elastic body, and the two driving feet protrude from the corresponding side surfaces of the metal elastic body in a direction away from the hollowed-out area.

13. The piezoelectric drive device according to claim 12, characterized in that, The piezoelectric driving device further includes a friction member, and the friction member is connected to the surface of the driven member facing the resonant assembly; the friction member includes two relatively arranged friction plates, the metal elastic body is located between the two friction plates, and the two driving feet are in one-to-one abutment with the two friction plates.

14. The piezoelectric driving device according to claim 13, wherein The forward preloading assembly is connected to the surface of the driven member facing the resonant assembly. The forward preloading assembly abuts against the surface of each friction plate facing away from the metal elastic body, and the forward preloading assembly presses each friction plate against the corresponding driving foot under the action of elastic force.

15. The piezoelectric driving device according to claim 14, wherein The forward preloading assembly includes a claw-shaped spring piece. At least one elastic claw portion of the claw-shaped spring piece abuts against the surface of one friction plate facing away from the metal elastic body, and at least one elastic claw portion of the claw-shaped spring piece abuts against the surface of the other friction plate facing away from the metal elastic body.

16. The piezoelectric driving device according to claim 1, wherein The resonant assembly further includes a driving shaft. The metal elastic body is connected to the device fixing bracket; the resonant assembly includes two piezoelectric material layers, and the two piezoelectric material layers are respectively arranged on two opposite surfaces of the metal elastic body; the driving shaft passes through the two piezoelectric material layers and the metal elastic body, and the driving feet of the metal elastic body are connected to the driving shaft. The driven member and the resonant assembly are located on the same side of the device fixing bracket. The device fixing bracket includes a first mounting portion and a second mounting portion arranged relatively. Two ends of the driving shaft are respectively mounted on the first mounting portion and the second mounting portion. The piezoelectric driving device further includes a friction member, the friction member is connected to the driven member, and the forward preloading assembly is configured to press the friction member against the driving shaft under the action of an elastic force.

17. The piezoelectric drive device according to claim 16, characterized in that, The friction member includes two clamping portions, one of the two clamping portions is connected to the driven member; the driving shaft is located between the two clamping portions, and the forward preloading assembly is configured to press the two clamping portions against the driving shaft under the action of an elastic force.

18. The piezoelectric driving device according to claim 17, wherein The forward preloading assembly includes two reed pieces, the two reed pieces are respectively located at two relatively arranged ends of the friction piece, and each reed piece is configured to press the corresponding ends of the two clamping portions together.

19. An antenna, characterized in that, It includes a phase shifter and the piezoelectric driving device according to any one of claims 1 to 18, wherein the phase shifter includes a frame and a medium and a strip line accommodated in the frame, the device fixing frame of the piezoelectric driving device is connected to the frame, and the driven member is connected to the medium.

20. A base station, characterized in that, It includes a radio frequency processing unit, a baseband processing unit and the antenna according to claim 19, and the baseband processing unit is connected to the antenna through the radio frequency processing unit.

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