CN114221132A - Transmission device for phase shifter, phase shifter and electrically-controlled antenna - Google Patents

Abstract

The invention discloses a transmission device for a phase shifter, the phase shifter and an electrically-adjusted antenna, which comprise transmission units and a switching mechanism, wherein the transmission units are provided with at least two dielectric plates and correspond to the dielectric plates one by one; the switching mechanism comprises a switching gear which can move and is meshed with different guide gears; the switching gear and the guide gear do not rotate, and the screw rod can move in a telescopic mode relative to the nut gear when the nut gear rotates, so that the corresponding medium plate is driven to move in a telescopic mode. After the switching gear is meshed with the guide gear, the switching gear, the guide gear and the screw rod all stop rotating, the nut gear rotates to enable the screw rod to move in a telescopic mode relative to the nut gear, so that the corresponding medium plate is driven to move in a telescopic mode, the structure is simpler, and the cost is reduced.

Description

Transmission device for phase shifter, phase shifter and electrically-controlled antenna

Technical Field

The invention relates to the technical field of communication equipment, in particular to a transmission device for a phase shifter, the phase shifter and an electrically tunable antenna.

Background

The phase shifter is one of the components of the electrically tunable antenna, and the phase of the wave can be adjusted by making the dielectric plate of the phase shifter move in a telescopic way. In the traditional phase shifter structure, a medium plate is provided with a transmission device, the transmission device adopts a gear set and the like to realize transmission so as to pull the medium plate to move telescopically, and finally the phase adjusting function of the phase shifter is realized. However, the transmission device of the multi-gear set is complex in structure and high in cost.

Disclosure of Invention

Based on this, it is necessary to provide a transmission device for a phase shifter, a phase shifter and an electrically tunable antenna; the transmission device for the phase shifter is simple in structure and relatively low in cost; the phase shifter comprises the transmission device for the phase shifter; the electrically tunable antenna comprises the phase shifter.

The technical scheme is as follows:

an embodiment provides an actuator for a phase shifter, comprising:

the transmission units are provided with at least two transmission units which correspond to the medium plates one by one, each transmission unit comprises a fixed seat, a nut gear, a screw and a guide gear, the nut gear is rotatably arranged on the fixed seat, the screw is in threaded connection with the nut gear, one end of the screw is connected with the corresponding medium plate, and the other end of the screw is connected with the guide gear;

a switching mechanism including a switching gear that is movable and engages with the different guide gear; the switching gear and the guide gear do not rotate, and when the nut gear rotates, the screw rod can move in a telescopic mode relative to the nut gear to drive the corresponding dielectric slab to move in a telescopic mode.

According to the transmission device for the phase shifter, when a certain phase needs to be adjusted, the switching gear moves to the position of the transmission unit corresponding to the phase and is meshed with the guide gear, then the switching gear stops rotating, the guide gear stops rotating, the screw rod also stops rotating along with the guide gear, although the screw rod cannot rotate, the nut gear is arranged on the fixed seat and cannot move but only rotate due to the fact that the screw rod is in threaded connection with the nut gear, therefore, the nut gear rotates and enables the screw rod to telescopically move relative to the nut gear to drive the corresponding medium plate to telescopically move to achieve adjustment of the phase, and after the phase is adjusted in place, the switching gear is separated from the guide gear to stop adjustment of the phase; compared with the traditional complex gear set structure, the gear set structure is simpler and reduces the cost.

The technical solution is further explained below:

in one embodiment, the switching mechanism further comprises an arc-shaped rack, the switching gear is meshed with the arc-shaped rack, and the switching gear can move along the arc-shaped rack to be meshed with different guide gears.

In one embodiment, the switching mechanism further comprises a ring gear, the switching gear being in mesh with the ring gear, the switching gear being movable along the ring gear to mesh with the different guide gears.

In one embodiment, the ring gear is rotatable, and the ring gear rotates and drives the switching gear to rotate, so that the switching gear moves along the ring gear.

In one embodiment, the ring gear has an inner tooth portion and an outer tooth portion, the switching gear is meshed with the ring gear through the inner tooth portion, and the switching mechanism further includes a first driving gear meshed with the ring gear through the outer tooth portion to drive the ring gear to rotate.

In one embodiment, the number of the switching gears is smaller than that of the guide gears.

In one embodiment, the other end of the screw rod is provided with a guide part, the cross section of the guide part is non-circular, and the guide gear is provided with a guide groove matched with the guide part so that the screw rod can move telescopically relative to the guide gear.

In one embodiment, the transmission unit further comprises a first bearing, the first bearing is arranged on the fixed seat, and the nut gear is rotatably arranged on the fixed seat through the first bearing;

the transmission unit further comprises a second driving gear, and the second driving gear is meshed with all the nut gears to drive the nut gears to rotate.

In one embodiment, the transmission unit further comprises a connecting seat, one end of the screw rod is rotatably connected with the connecting seat, and the medium plate is connected with the connecting seat.

In one embodiment, the transmission unit further comprises a second bearing, the second bearing is arranged on the connecting seat, and one end of the screw rod is rotatably connected with the connecting seat through the second bearing;

the transmission unit further comprises a first clamping ring and a second clamping ring, the first clamping ring is used for enabling the second bearing to be fixed on the connecting seat, and the second clamping ring is used for enabling the screw rod to be not separated from the second bearing.

In one embodiment, the transmission unit further includes a guide block fixedly disposed, the guide block and the fixing seat are respectively located at two opposite sides of the connecting seat, the guide block is provided with a guide hole, and the medium plate is in guide fit with the guide hole.

In one embodiment, the transmission unit further includes a pin shaft, the pin shaft is arranged on the connecting seat, one end of the medium plate is rotatably connected with the connecting seat through the pin shaft, and the other end of the medium plate penetrates through the guide hole, so that the medium plate is in guide fit with the guide block.

Another embodiment provides a phaser comprising an actuator as described in any one of the above claims for a phaser.

The phase shifter comprises the transmission device for the phase shifter, so that the complexity of the structure is reduced, and the cost is reduced.

Still another embodiment provides an electrically tunable antenna, including the phase shifter according to the above technical solution.

The electrically tunable antenna comprises the phase shifter, so that the complexity of the structure is reduced, and the cost is reduced.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Furthermore, the drawings are not drawn to a 1:1 scale, and the relative sizes of the various elements in the drawings are drawn only by way of example, and not necessarily to true scale.

FIG. 1 is a schematic diagram of an actuator for a phase shifter according to an embodiment of the present invention;

FIG. 2 is an assembly view of the screw, the connecting seat, the guide block and the dielectric plate in the embodiment of FIG. 1;

FIG. 3 is a block diagram of an embodiment of a switching gear and an arc rack in a transmission for a phase shifter;

FIG. 4 is a block diagram of one embodiment of a switching gear and ring gear for use in a transmission for a phaser;

FIG. 5 is a block diagram of another embodiment of a switching gear and ring gear for use in a transmission for a phaser;

fig. 6 is an assembly structural view of a plurality of nut gears engaged with the second driving gear in the embodiment of fig. 1.

Reference is made to the accompanying drawings in which:

110. a fixed seat; 111. a first bearing; 120. a nut gear; 130. a screw; 131. a threaded portion; 140. a guide gear; 150. a second drive gear; 160. a connecting seat; 161. a second bearing; 171. a first snap ring; 172. a second snap ring; 180. a guide block; 181. a guide hole; 190. a pin shaft; 210. a switching gear; 221. an arc-shaped rack; 222. a ring gear; 2221. an inner tooth portion; 2222. an outer tooth portion; 230. a first drive gear; 300. a dielectric plate.

Detailed Description

Embodiments of the present invention are described in detail below with reference to the accompanying drawings:

in order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

The multi-frequency electrically tunable antenna adjusts a corresponding phase through the phase shifter, and particularly adjusts the corresponding phase through expansion of the dielectric plate 300 of the phase shifter.

Referring to fig. 1, an embodiment provides an actuator for a phase shifter, including an actuator unit and a switching mechanism. Wherein:

the transmission units are provided with at least two and correspond to the dielectric slabs 300 one to one.

The number of the dielectric plates 300 is at least two, and when a certain dielectric plate 300 is extended or contracted and the position of the dielectric plate 300 is changed, the corresponding phase is changed, thereby realizing the phase adjustment. In order to satisfy the telescopic movement of the at least two dielectric slabs 300, at least two transmission units are provided to correspond one-to-one to the dielectric slabs 300.

As shown in fig. 1, the transmission unit includes a fixing base 110, a nut gear 120, a screw 130 and a guide gear 140, the nut gear 120 is rotatably disposed on the fixing base 110, the screw 130 is screwed with the nut gear 120, one end of the screw 130 is connected with a corresponding dielectric plate 300, and the other end of the screw 130 is connected with the guide gear 140.

As shown in fig. 1, the switching mechanism includes a switching gear 210, and the switching gear 210 is movable and engaged with the different guide gears 140; the switching gear 210 and the guide gear 140 do not rotate, and when the nut gear 120 rotates, the screw 130 can move telescopically relative to the nut gear 120 to drive the corresponding dielectric plate 300 to move telescopically.

When a certain phase needs to be adjusted, the switching gear 210 moves to the position of the transmission unit corresponding to the phase and is meshed with the guide gear 140, then the switching gear 210 stops rotating, the guide gear 140 stops rotating, the screw 130 also stops rotating along with the guide gear 140, although the screw 130 cannot rotate, because the screw 130 is in threaded connection with the nut gear 120, the nut gear 120 is arranged on the fixed seat 110 and cannot move but only rotate, therefore, the nut gear 120 rotates and enables the screw 130 to telescopically move relative to the nut gear 120 so as to drive the corresponding medium plate 300 to telescopically move, so that the phase is adjusted, and when the phase is adjusted in place, the switching gear 210 is separated from the guide gear 140, so that the phase is stopped being adjusted; compared with the traditional complex gear set structure, the gear set structure is simpler and reduces the cost.

As shown in fig. 1, when the phase adjustment is not required, the switching gear 210 is disengaged from the guide gear 140, and at this time, the nut gear 120 may be in a rotating state or a non-rotating state. Wherein:

when the nut gear 120 is in a rotating state, since the guide gear 140 is not restricted by the switching gear 210, the screw 130 and the guide gear 140 thereon both rotate with the nut gear 120, there is no telescopic movement of the screw 130 along the length direction thereof, and thus the medium plate 300 does not move telescopically (the screw 130 can rotate relative to the medium plate 300 when rotating).

When the nut gear 120 is in a non-rotating state, there is no movement of the screw 130, and thus the medium plate 300 does not move telescopically.

As shown in fig. 1, when the phase adjustment is required, the position of the switching gear 210 is changed so that the switching gear 210 moves to a position where it engages with the guide gear 140 and engages with it, and the transmission unit in which the guide gear 140 is located corresponds to the medium plate 300 whose phase is required to be adjusted, so that the adjustment of the required phase can be achieved by performing a certain degree of telescopic movement of the medium plate 300. Specifically, the method comprises the following steps:

when corresponding phase adjustment is needed, if the nut gear 120 is always in a rotating state, after the switching gear 210 is meshed with the guide gear 140, the guide gear 140 stops rotating, because the switching gear 210 is meshed with the guide gear 140, the guide gear 140 also stops rotating, and because the other end of the screw 130 is connected with the guide gear 140, the screw 130 cannot rotate due to the fact that the guide gear 140 stops rotating, at this time, because the screw 130 is in threaded connection with the nut gear 120 and the nut gear 120 is in a rotating state, the screw 130 stretches and retracts along the length direction of the screw 130 relative to the nut gear 120, so that the medium plate 300 is driven to stretch and retract, and phase adjustment is achieved.

When corresponding phase adjustment is needed, if the nut gear 120 is in a non-rotating state, after the switching gear 210 is meshed with the guide gear 140, the guide gear 140 stops rotating, the switching gear 210 and the screw 130 do not rotate, then the nut gear 120 rotates, and due to the fact that the screw 130 is in threaded connection with the nut gear 120, the screw 130 stretches and retracts relative to the nut gear 120 along the length direction of the screw 130, the medium plate 300 is driven to stretch and retract, and phase adjustment is achieved.

Alternatively, when the screw 130 moves telescopically relative to the nut gear 120, there are two cases of the screw 130 and the guide gear 140:

one situation is: the screw 130 drives the guide gear 140 to synchronously extend and retract, and the guide gear 140 moves relative to the switching gear 210. In this case, it is necessary to ensure that the guide gear 140 and the switching gear 210 are not separated from each other and are always in a meshed non-rotating state within the extension range of the screw 130, and the screw 130 can drive the guide gear 140 to rotate synchronously when rotating.

The other situation is that: the screw 130 moves telescopically with respect to the guide gear 140, and the guide gear 140 does not move with respect to the switching gear 210. In this case, it needs to be ensured that the other end of the screw 130 does not depart from the guide gear 140 all the time within the extension range of the screw 130, and the screw 130 can drive the guide gear 140 to rotate synchronously when rotating.

It can be understood that:

the telescopic direction of the screw 130 relative to the nut gear 120 can be realized by the forward and reverse rotation of the nut gear 120, so as to realize the telescopic adjustment of the dielectric plate 300, which is not described in detail.

In one embodiment, referring to fig. 3, the switching mechanism further includes an arc-shaped rack 221, the switching gear 210 is engaged with the arc-shaped rack 221, and the switching gear 210 can move along the arc-shaped rack 221 to engage with different guide gears 140.

This embodiment can be divided into two cases:

first, the arc-shaped rack 221 is fixed, the switching gear 210 rotates, and the switching gear 210 moves along the arc-shaped rack 221 during the rotation to reach the guide gear 140 of the transmission unit corresponding to the medium plate 300 requiring phase adjustment and to be engaged with the guide gear 140.

Second, the arc-shaped rack 221 can swing/rotate to drive the switching gear 210 to rotate, so that the switching gear 210 moves to the corresponding guide gear 140 and engages with the guide gear 140.

It should be noted that:

in the process of meshing the switching gear 210 with the arc-shaped rack 221, a corresponding limiting frame or limiting plate can be configured, and the switching gear 210 and the arc-shaped rack 221 are ensured to be always in a meshed state through a guide groove or a slide rail and are not separated.

In another embodiment, referring to fig. 4 and 5, the switching mechanism further includes a ring gear 222, the switching gear 210 is engaged with the ring gear 222, and the switching gear 210 can move along the ring gear 222 to engage with different guide gears 140.

As shown in fig. 4 and 5, the switching gear 210 and the ring gear 222 cooperate to form a planetary gear set, and the switching gear 210 moves along the ring gear 222 to engage with different guide gears 140, thereby performing the telescopic movement of the corresponding screw 130 and the corresponding dielectric plate 300.

It can be understood that: the switching gear 210 and the ring gear 222 may be at least one motion to perform the function of the switching gear 210 moving along the ring gear 222.

It should be noted that:

in the process of meshing the switching gear 210 with the gear ring 222, a corresponding limit frame or limit plate can be configured, and the switching gear 210 and the gear ring 222 are ensured to be always in a meshed state through a guide groove or a slide rail and are not separated.

In one embodiment, referring to fig. 4 and 5, the gear ring 222 can rotate, and the gear ring 222 rotates and drives the switching gear 210 to rotate, so that the switching gear 210 moves along the gear ring 222.

As shown in fig. 4 and 5, the ring gear 222 and the switching gear 210 form a set of planetary gear sets, and when the ring gear 222 rotates, the switching gear 210 is driven to rotate, and the switching gear 210 is driven to rotate, so that the switching gear 210 moves along the ring gear 222 to be meshed with different guide gears 140.

In one embodiment, referring to fig. 4 and 5, the ring gear 222 has internal teeth 2221 and external teeth 2222, the switching gear 210 is engaged with the ring gear 222 through the internal teeth 2221, and the switching mechanism further includes a first driving gear 230, and the first driving gear 230 is engaged with the ring gear 222 through the external teeth 2222 to drive the ring gear 222 to rotate.

As shown in fig. 4 and 5, the external teeth portion 2222 of the ring gear 222 is engaged with the first drive gear 230, the internal teeth portion 2221 of the ring gear 222 is engaged with the switching gear 210, the first drive gear 230 rotates to drive the ring gear 222 to rotate, and the ring gear 222 rotates to drive the switching gear 210 to rotate, so that the switching gear 210 moves and is engaged with different guide gears 140.

Alternatively, the first drive gear 230 may be driven by a first drive member (e.g., a drive motor).

In one embodiment, referring to fig. 5, at least two switching gears 210 are provided and are spaced apart from each other in the circumferential direction of the ring gear 222, and the number of the switching gears 210 is smaller than that of the guide gears 140.

As shown in fig. 5, there are two switching gears 210 and four guiding gears 140, and when the gear ring 222 rotates, the two switching gears 210 can be driven to move simultaneously, so that the two switching gears 210 are engaged with the corresponding guiding gears 140 according to a set requirement, thereby achieving the purpose of adjusting the two medium plates 300 by telescopic movement.

Alternatively, after the two switching gears 210 are respectively engaged with the corresponding guide gears 140, both of the corresponding two medium plates 300 can be adjusted. In this case, if the rotation speeds of the nut gears 120 matched with the screws 130 corresponding to the two dielectric plates 300 are the same or the screws 130 are both driven by the same nut gear 120, the expansion amplitudes of the two dielectric plates 300 are the same; if the rotation speeds of the nut gears 120 matched with the screws 130 corresponding to the two dielectric plates 300 are different, the expansion and contraction amplitudes of the two dielectric plates 300 may be different. Those skilled in the art can perform corresponding setting according to the requirement of the adjustment range of the dielectric plate 300, and will not be described herein.

In one embodiment, the other end of the screw 130 is provided with a guide portion having a non-circular cross-sectional shape, and the guide gear 140 is provided with a guide groove engaged with the guide portion so that the screw 130 can move telescopically with respect to the guide gear 140.

The guide portion of the screw 130 may have a substantially square or oval cross-section or the like to enable transmission between the screw 130 and the guide gear 140; meanwhile, the screw 130 can be telescopically moved with respect to the guide gear 140 when the screw 130 is telescopically extended in the length direction thereof.

In one embodiment, referring to fig. 1, the transmission unit further includes a first bearing 111, the first bearing 111 is disposed on the fixing base 110, and the nut gear 120 is rotatably disposed on the fixing base 110 through the first bearing 111. The first bearing 111 realizes the rotary connection between the nut gear 120 and the fixed seat 110.

In one embodiment, referring to fig. 1, the transmission unit further includes a second driving gear 150, and the second driving gear 150 is engaged with all the nut gears 120 to drive the nut gears 120 to rotate.

The second driving gear 150 drives all the nut gears 120 to rotate. When the phase adjustment is not needed, the second driving gear 150 drives all the nut gears 120 to rotate, and since all the guide gears 140 are not engaged with the switching gear 210, the screw 130 idles and does not move telescopically. When the switching gear 210 is engaged with a certain guide gear 140, the switching gear 210 stops rotating, so that the guide gear 140 also stops rotating, and at this time, the screw 130 cannot rotate but can only move telescopically relative to the nut gear 120, thereby achieving the effect of driving the corresponding dielectric plate 300 to move telescopically, and completing the phase adjustment.

Alternatively, the second drive gear 150 may be driven by a second drive member (e.g., a drive motor).

As shown in fig. 1 and 2, a threaded portion 131 is provided at the middle of the screw 130, and the threaded portion 131 is screwed with the threaded hole of the nut gear 120, so as to realize the screwed fit of the screw 130 and the nut gear 120.

In one embodiment, referring to fig. 6, there are four nut gears 120, there is one second driving gear 150, all the nut gears 120 are engaged with the second driving gear 150, and the four nut gears 120 are arranged at equal intervals along the circumference of the second driving gear 150.

In one embodiment, referring to fig. 1 and 2, the transmission unit further includes a connection seat 160, one end of the screw 130 is rotatably connected to the connection seat 160, and the medium plate 300 is connected to the connection seat 160.

When the screw 130 rotates without telescopic movement, the screw 130 does not drive the connecting seat 160 to rotate, thereby not affecting the dielectric plate 300.

In one embodiment, referring to fig. 1 and 2, the transmission unit further includes a second bearing 161, the second bearing 161 is disposed on the connection seat 160, and one end of the screw 130 is rotatably connected to the connection seat 160 through the second bearing 161.

As shown in fig. 1, the upper end of the screw 130 is rotatably connected to the connection base 160 through the second bearing 161, the lower end of the screw 130 is engaged with the guide gear 140 through the guide portion and is in driving engagement, and the middle portion of the screw 130 is engaged with the nut gear 120 through the screw portion 131.

In one embodiment, referring to fig. 1 and 2, the transmission unit further includes a first snap ring 171 and a second snap ring 172, the first snap ring 171 is used for fixing the second bearing 161 on the connection seat 160, and the second snap ring 172 is used for preventing the screw 130 from being disengaged from the second bearing 161.

In one embodiment, referring to fig. 1 and 2, the transmission unit further includes a guide block 180 fixedly disposed, the guide block 180 and the fixing base 110 are respectively located at two opposite sides of the connecting base 160, the guide block 180 is provided with a guide hole 181, and the medium plate 300 is in guide fit with the guide hole 181.

As shown in fig. 2, the guide block 180 has a guide hole 181 arranged in the longitudinal direction, and the medium plate 300 is guided to fit into the guide hole 181 so that the medium plate 300 can move telescopically in the longitudinal direction.

In one embodiment, referring to fig. 2, the transmission unit further includes a pin 190, the pin 190 is disposed on the connection seat 160, one end of the dielectric plate 300 is rotatably connected to the connection seat 160 through the pin 190, and the other end of the dielectric plate 300 passes through the guide hole 181, so that the dielectric plate 300 is in guide fit with the guide block 180.

In the process of telescopic movement of the dielectric plate 300, in order to prevent the dielectric plate 300 from being jammed between the hole walls of the guide hole 181, the pin shaft 190 is provided, so that the dielectric plate 300 swings in the guide hole 181 with a preset amplitude, thereby preventing the jamming.

For example, the medium plate 300 may be made to have a swing in the range of-2 ° to-2 °.

Another embodiment provides a phaser comprising an actuator as described in any of the above embodiments for a phaser.

The phase shifter comprises the transmission device for the phase shifter, so that the complexity of the structure is reduced, and the cost is reduced.

Yet another embodiment provides an electrically tunable antenna including the phase shifter according to the above embodiment.

The electrically tunable antenna comprises the phase shifter, so that the complexity of the structure is reduced, and the cost is reduced.

Optionally, this electricity is transferred antenna includes the control panel, and first driving piece and second driving piece all with control panel electric connection, the control panel can send control signal towards first driving piece and second driving piece to make first driving piece drive first drive gear 230 and rotate or do not rotate, make second driving piece drive second drive gear 150 and rotate or do not rotate, no longer describe repeatedly.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (14)

1. An actuator for a phase shifter, comprising:

the transmission units are provided with at least two transmission units which correspond to the medium plates one by one, each transmission unit comprises a fixed seat, a nut gear, a screw and a guide gear, the nut gear is rotatably arranged on the fixed seat, the screw is in threaded connection with the nut gear, one end of the screw is connected with the corresponding medium plate, and the other end of the screw is connected with the guide gear;

a switching mechanism including a switching gear that is movable and engages with the different guide gear; the switching gear and the guide gear do not rotate, and when the nut gear rotates, the screw rod can move in a telescopic mode relative to the nut gear to drive the corresponding dielectric slab to move in a telescopic mode.

2. The transmission for a phase shifter according to claim 1, wherein the switching mechanism further includes an arc-shaped rack, the switching gear being engaged with the arc-shaped rack, the switching gear being movable along the arc-shaped rack to engage with different ones of the guide gears.

3. The transmission for a phase shifter as recited in claim 1, wherein said switching mechanism further includes a ring gear, said switching gear being engaged with said ring gear, said switching gear being movable along said ring gear to engage with different said guide gears.

4. The transmission for phase shifters of claim 3 wherein said ring gear is rotatable, said ring gear rotating and bringing said switching gear into rotation to move said switching gear along said ring gear.

5. The transmission for a phase shifter as recited in claim 4, wherein said ring gear has inner teeth portions and outer teeth portions, said switching gear is meshed with said ring gear through said inner teeth portions, and said switching mechanism further comprises a first drive gear meshed with said ring gear through said outer teeth portions to drive said ring gear to rotate.

6. The transmission for the phase shifter as claimed in claim 4, wherein the switching gears are provided in at least two and are spaced apart in a circumferential direction of the ring gear, and the number of the switching gears is smaller than the number of the guide gears.

7. A transmission for a phase shifter according to any one of claims 1 to 6 wherein the other end of the screw is provided with a guide portion, the guide portion having a non-circular cross-sectional shape, and the guide gear is provided with a guide groove engaged with the guide portion to enable the screw to move telescopically with respect to the guide gear.

8. The transmission device for the phase shifter according to any one of claims 1 to 6, wherein the transmission unit further comprises a first bearing, the first bearing being provided on the fixed base, the nut gear being rotatably provided on the fixed base by the first bearing;

the transmission unit further comprises a second driving gear, and the second driving gear is meshed with all the nut gears to drive the nut gears to rotate.

9. A transmission device for a phase shifter according to any one of claims 1 to 6, wherein the transmission unit further includes a connection seat, one end of the screw rod is rotatably connected to the connection seat, and the medium plate is connected to the connection seat.

10. The transmission device for a phase shifter according to claim 9, wherein the transmission unit further includes a second bearing provided on the connection block, and one end of the screw rod is rotatably connected to the connection block through the second bearing;

the transmission unit further comprises a first clamping ring and a second clamping ring, the first clamping ring is used for enabling the second bearing to be fixed on the connecting seat, and the second clamping ring is used for enabling the screw rod to be not separated from the second bearing.

11. The transmission device for the phase shifter according to claim 9, wherein the transmission unit further comprises a guide block fixedly disposed, the guide block and the fixing seat are respectively disposed at two opposite sides of the connecting seat, the guide block is provided with a guide hole, and the dielectric plate is in guide fit with the guide hole.

12. The transmission device for the phase shifter according to claim 11, wherein the transmission unit further comprises a pin shaft, the pin shaft is disposed on the connecting seat, one end of the dielectric plate is rotatably connected to the connecting seat through the pin shaft, and the other end of the dielectric plate passes through the guide hole, so that the dielectric plate is guide-fitted to the guide block.

13. A phaser, comprising an actuator for a phaser according to any one of claims 1-12.

14. An electrically tunable antenna comprising the phase shifter of claim 13.

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