CN113922013A - Phase-shifting frequency-selecting device and multi-frequency antenna - Google Patents

Abstract

The invention provides a phase-shifting frequency-selecting device and a multi-frequency antenna, wherein the phase-shifting frequency-selecting device comprises a support and a frequency-selecting locking mechanism, the support is used for supporting two rows of phase-shifting racks, the two rows of phase-shifting racks are arranged in a staggered and opposite mode, a channel for the frequency-selecting locking mechanism to linearly run along the arrangement direction of the two rows of phase-shifting racks is formed in the support, and the frequency-selecting locking mechanism comprises a phase-shifting gear suitable for being meshed with any one of the phase-shifting racks and a locking piece suitable for being in frictional contact with limiting teeth provided by the support at the position, opposite to the meshed phase-shifting racks, of the support. The frequency-selecting locking mechanism of the phase-shifting frequency-selecting device is abutted against the limiting teeth on the bracket through the locking piece, so that when the phase-shifting gear of the frequency-selecting phase-shifting mechanism is meshed with any one phase-shifting rack, the frequency-selecting phase-shifting mechanism can be locked and fixed, the frequency-selecting phase-shifting mechanism can stably drive the phase-shifting rack, and further, the phase-shifting performance is stable.

Description

Phase-shifting frequency-selecting device and multi-frequency antenna

Technical Field

The invention belongs to the technical field of mobile communication, and particularly relates to a phase-shifting frequency-selecting device and a multi-frequency antenna provided with the same.

Background

With the increasing number of mobile communication terminal users and the popularity of 5G, the demand for network capacity of sites in a mobile cellular network is increasing, and at the same time, the interference between different sites and even between different sectors of the same site is required to be minimized, that is, the maximization of network capacity and the minimization of interference are achieved. This is usually achieved by adjusting the downtilt angle of the antenna beam at the station.

When the antenna is a multi-frequency antenna, the beam downtilt angle is mainly adjusted by adopting a mechanical downtilt mode. Specifically, a transmission device is arranged in the antenna, the transmission device is respectively connected with phase shifting parts corresponding to each frequency band in the multi-frequency antenna through a plurality of phase shifting parts, and after the transmission device is meshed with any one phase shifting part through a phase shifting gear, the phase shifting gear is rotated to drive the phase shifting part to control the phase shifting part corresponding to the frequency band to move, so that the phase shifting operation is implemented.

However, in this method, the phase shift gear is required to move linearly back and forth inside the transmission device to be engaged with any one of the phase shift members, and since the phase shift gear moves mechanically, the phase shift gear is prone to being misaligned with the corresponding phase shift member in the moving process, or the phase shift gear shakes violently when being engaged with the phase shift member, thereby affecting the phase shift effect of the phase shift member and further affecting the adjustment accuracy of the downward inclination angle of the antenna beam. Particularly, under the condition that one transmission device is used for controlling the phase shift of dozens of frequency bands, the technical proposal is particularly urgent, as to how to accurately shift the phase and ensure the structural stability of the phase shift process.

Disclosure of Invention

The first objective of the present invention is to provide a phase-shifting frequency-selecting device.

Another objective of the present invention is to provide a multi-band antenna.

The invention is suitable for the purpose of the invention and adopts the following technical scheme:

the invention provides a phase-shifting frequency-selecting device which is suitable for the first purpose and comprises a support and a frequency-selecting locking mechanism, wherein the support is used for supporting two rows of phase-shifting racks, the two rows of phase-shifting racks are arranged in a staggered and opposite mode, the support is provided with a channel for the frequency-selecting locking mechanism to linearly run along the arrangement direction of the two rows of phase-shifting racks, and the frequency-selecting locking mechanism comprises a phase-shifting gear which is suitable for being meshed with any one phase-shifting rack and a locking piece which is suitable for being abutted against limiting teeth provided by the support at the position, opposite to the meshed phase-shifting rack.

Furthermore, when the frequency-selecting locking mechanism is in a state of being meshed with one of the phase-shifting racks, an avoiding gap is formed between the locking piece and the meshed phase-shifting rack.

Further, the bracket is provided with the limiting teeth on at least one side of each phase shifting rack in the arrangement direction, wherein the limiting teeth on two sides of at least one phase shifting rack and the limiting teeth on the opposite positions of the phase shifting rack form an accommodating space of the locking mechanism together.

Specifically, the locking piece and the limiting teeth are located at one end of the support, and the end is located at the pointed end of the longitudinal direction of the phase shifting rack.

Specifically, the frequency-selecting locking mechanism further comprises a balancing piece, the balancing piece is arranged at the other end opposite to the end where the locking piece is arranged, and slides on an avoidance channel formed at the other end of the bracket when the balancing piece moves linearly along with the frequency-selecting locking mechanism.

Preferably, the balancing member has a regular rectangular profile, and the escape channel of the bracket allows the balancing member to slide with the regular rectangular profile.

Specifically, the locking piece is the boss form, spacing tooth corresponds the locking piece is the boss form.

Furthermore, the locking piece is provided with a locking plane, the limiting tooth is provided with a limiting plane, and when the frequency-selecting locking mechanism is in a state of being meshed with one of the phase-shifting racks, the locking plane is in frictional contact with the limiting plane.

Furthermore, the frequency-selecting locking mechanism is provided with two locking pieces which are symmetrically arranged along the arrangement direction and fixedly connected with each other.

Preferably, the phase shift frequency selection device comprises two frequency selection locking mechanisms linked side by side along the arrangement direction, and when one of the frequency selection locking mechanisms is engaged with one of the phase shift racks, the other frequency selection locking mechanism is not engaged with any one of the phase shift racks, or the other frequency selection locking mechanism is engaged with the other phase shift rack.

Furthermore, the bracket is suitable for each phase-shifting rack and is provided with a sliding groove for accommodating the phase-shifting rack, a rib is formed between every two adjacent sliding grooves, and the limiting teeth are arranged on the rib.

Furthermore, the spout is kept away from in its lengthwise direction the other end of spacing tooth is equipped with the stable tooth, the stable tooth sets up on the rib, the lateral surface of all stable teeth of same row of spout is located the coplanar for inject dodge one side of channel.

Specifically, when the frequency-selecting locking mechanism is in a state of being meshed with one of the phase-shifting racks, under the constraint that the balance piece of the frequency-selecting locking mechanism is matched and positioned with the stabilizing teeth, the locking piece of the frequency-selecting locking mechanism is in interference fit with the limiting teeth to realize the friction contact.

Preferably, the frequency-selecting locking mechanism comprises a box body, the phase-shifting gears are arranged in the box body, the box body is provided with two openings corresponding to the two rows of phase-shifting racks, and partial external teeth of the phase-shifting gears are exposed to the outside through the two openings so as to be meshed with the phase-shifting racks.

Preferably, the two frequency-selecting locking mechanisms are connected through a linkage piece, so that the two frequency-selecting locking mechanisms synchronously execute linear motion.

Furthermore, each phase shift rack is used for linking a phase shift component of the antenna of one frequency band.

Specifically, the phase-shifting frequency-selecting device further comprises a transmission shaft and a transmission screw, the frequency-selecting locking mechanism is further provided with a position-selecting gear meshed with the phase-shifting gear, the position-selecting gear is sleeved on the transmission screw through a threaded hole of the position-selecting gear to form a screw mechanism, and the transmission screw is rotated to drive the frequency-selecting locking mechanism to linearly run and be meshed with any one phase-shifting rack; the phase shift gear is sleeved on the transmission shaft through a gear hole of the phase shift gear, the transmission screw and the transmission shaft are driven simultaneously, and the phase shift gear drives the meshed phase shift rack to move.

The present invention further provides a multi-band antenna, which comprises a plurality of phase shifting units corresponding to a plurality of frequency bands, and the multi-band antenna comprises the phase shifting frequency selecting device according to the first aspect, wherein each phase shifting unit has a phase shifting rack corresponding to one of the phase shifting frequency selecting devices and is linked with the phase shifting rack.

Compared with the prior art, the invention has the following advantages:

firstly, the phase shift gear of the frequency-selecting locking mechanism of the phase-shifting frequency-selecting device can be meshed with any one phase shift rack, and the phase shift rack drives the phase-shifting part to move so as to implement phase shifting. The frequency-selecting locking mechanism is inconsistent with the limiting teeth on the support through the locking piece of the frequency-selecting locking mechanism, so that when the phase-shifting gear is meshed with any one phase-shifting rack in alignment, the limiting teeth and the locking piece are mutually restricted, so that the phase-shifting gear and the phase-shifting rack can be stably meshed, mechanical factors influencing the phase-shifting performance such as shaking or jumping and the like cannot be generated when the phase-shifting gear and the phase-shifting rack are meshed in alignment and transmitted, and the phase-shifting device can stably implement phase shifting.

Secondly, a plurality of limiting teeth of the phase-shifting frequency-selecting device can form an accommodating space, and after the frequency-selecting locking mechanism enters the accommodating space, a phase-shifting gear on the frequency-selecting locking mechanism can be aligned to a phase-shifting rack corresponding to the accommodating space, so that the phase-shifting gear can be easily aligned and meshed with the phase-shifting gear; and because of spacing tooth passes through the motion of locking piece restraint frequency selection locking mechanism, the accommodation space that a plurality of spacing teeth are constituteed can further retrain frequency selection locking mechanism spacing to can not shake in making the gear that moves the phase and moving the transmission of rack, influence the performance of moving the phase.

Thirdly, two sides of the frequency-selecting locking mechanism of the phase-shifting frequency-selecting device are respectively provided with a row of phase-shifting racks, and the bracket is provided with a limiting piece at one side of each phase-shifting rack corresponding to the frequency-selecting locking mechanism, so that the locking piece of the frequency-selecting locking mechanism is matched with the limiting piece to correspondingly limit the two rows of phase-shifting racks, and therefore, when the frequency-selecting locking mechanism of the phase-shifting frequency-selecting device is meshed with any one phase-shifting rack, the phase-shifting performance is not affected by jitter and the like, and the like.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a front view of a partial structure of a phase shift frequency selecting device of the present invention.

Fig. 2 is a rear view of a partial structure of the phase shift frequency selecting device of the present invention.

Fig. 3 is a schematic structural diagram of a frequency-selecting locking mechanism of the phase-shifting frequency-selecting device of the present invention.

Fig. 4 is a perspective view of the frequency-selecting locking mechanism of the phase-shifting frequency-selecting device of the present invention.

Fig. 5 is a schematic structural diagram of an upper frame plate of the phase shift frequency selection device of the present invention.

Fig. 6 is a schematic structural diagram of a lower frame plate of the phase shifting frequency selecting device of the present invention.

Fig. 7 is a schematic structural diagram of a phase shift rack and a fixing part of the phase shift frequency selecting device of the present invention.

Fig. 8 is a schematic structural view of a fixing member of the phase shift frequency selecting device of the present invention.

Fig. 9 is a schematic structural diagram of the phase shift frequency selection device of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of illustrating the present invention and are not to be construed as limiting the present invention.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The invention provides a phase-shifting frequency-selecting device, which can be respectively connected with phase-shifting parts of a plurality of frequency bands of a multi-frequency antenna, and the phase-shifting frequency-selecting device can accurately align the phase-shifting parts needing to be moved and stably move the phase-shifting parts, so that the phase-shifting performance of the phase-shifting parts is stable, and the adjustment accuracy of the downward inclination angle of an antenna beam is not influenced.

In the exemplary embodiment of the present invention, the phase shifting frequencyselective device 10 includes abracket 20, a frequencyselective locking mechanism 30, aphase shifting rack 40 and a transmission mechanism.

Referring to fig. 1, thebracket 20 is hollow so as to support the frequency-selectinglocking mechanism 30, the phase-shiftingrack 40 and the transmission mechanism. The outer contour of thebracket 20 is approximately rectangular parallelepiped with a longitudinal shape, thebracket 20 includes anupper frame plate 21 and alower frame plate 22, and the back surface of theupper frame plate 21 faces the front surface of thelower frame plate 22.

Thephase shift rack 40 is connected with a phase shift component of the antenna, and thephase shift rack 40 moves linearly to pull the phase shift component to move, so that the phase shift component shifts the phase of the signal fed into the phase shift rack. One side of thephase shift rack 40 has external teeth, and one end of thephase shift rack 40 is connected to the phase shift part.

Thebracket 20 is provided with a slidinggroove 23 for a moving path of thephase shift rack 40, so that thephase shift rack 40 can be stably arranged on thebracket 20, thephase shift rack 40 can slide through the slidinggroove 23, and the moving path of thephase shift rack 40 is restricted. Specifically, the plurality of phase shift racks 40 are divided into two rows and disposed on the back surface of theupper frame plate 21 and the front surface of thelower frame plate 22, respectively, and theupper frame plate 21 and thelower frame plate 22 are respectively provided with the slidinggrooves 23 for the phase shift racks 40 disposed thereon to slide. The slidinggroove 23 on the reverse side of theupper frame plate 21 is arranged to protrude towards the front side of thelower frame plate 22, and the slidinggroove 23 on the front side of thelower frame plate 22 is arranged to protrude towards the reverse side of theupper frame plate 22.

Referring to fig. 5 and 6, the slidinggroove 23 includes tworibs 231, and the tworibs 231 are disposed to protrude toward the oppositeupper shelf 21 orlower shelf 22 so as to form the slidinggroove 23 protruding from theupper shelf 21 orlower shelf 22. The tworibs 231 of theslide groove 23 are parallel to each other, and the tworibs 231 are symmetrical to each other about the central axis of thephase shift rack 40 in the longitudinal direction. However, because the distance between two adjacent phase shift racks 40 in the same row is small, the plurality of slidingslots 23 in the same row are convenient to arrange, so that onerib 231 is shared between two adjacent slidingslots 23 in the same row, thereby saving the space of thebracket 20, reducing the volume of thebracket 20, and facilitating the miniaturization of the phase shiftfrequency selection device 10.

Referring to fig. 9, the two rows of phase shift racks 40 are parallel to each other, and the two rows of phase shift racks 40 are disposed in opposite directions and staggered to each other. Specifically, the distance between two adjacent phase shift racks 40 in the same row of phase shift racks 40 is equal, and the projections of the two rows of phase shift racks 40 on the front surface of thelower frame plate 22 are alternately arranged in sequence, so that the upper and lower rows of phase shift racks 40 are alternately arranged in a spatially staggered manner in opposite directions. That is, the projection of onephase shift rack 40 disposed on theupper frame plate 21 on the front surface of thelower frame plate 22 is adjacent to the projection of onephase shift rack 40 or two adjacent phase shift racks 40 on thelower frame plate 22 on the front surface of thelower frame plate 22, so that two rows of phase shift racks 40 are disposed in a staggered manner.

Referring to fig. 1, 5 and 6, thebracket 20 is provided with two rows of slidinggrooves 23 corresponding to the two rows of phase shift racks 40, and respectively arranged on theupper frame plate 21 and thelower frame plate 22 for accommodating the two rows of phase shift racks 40. The two rows of slidingchutes 23 may be correspondingly referred to the arrangement of the two rows of phase-shiftingracks 40, that is, the two rows of slidingchutes 23 are spatially alternately arranged in a staggered manner.

Because the two rows of slidingchutes 23 are staggered and arranged oppositely, and the two adjacent slidingchutes 23 in the same row share onerib 231, theribs 231 of the two rows of slidingchutes 23 are also staggered and arranged oppositely in turn in space. That is, the projections of theribs 231 of the two rows of slidinggrooves 23 on the front surface of thelower frame plate 22 are sequentially and alternately arranged, and the distances between the projections of any twoadjacent ribs 231 in the projection direction are the same.

Thebracket 20 is further provided with a limitingtooth 24 on therib 231 of the slidinggroove 23, and the limitingtooth 24 extends from the top of therib 231 to the opposite direction of theupper frame plate 21 or thelower frame plate 22. Theribs 231 of the two rows of slidinggrooves 23 on thebracket 20 are correspondingly provided with the limitingteeth 24, the structure of each limitingtooth 24 is the same, and the directions of the limitingteeth 24 in different rows are opposite. The spacing between any twoadjacent spacing teeth 24 in the same row is equal.

Because theribs 231 of the two rows of slidinggrooves 23 are alternately staggered and oppositely arranged, the limitingteeth 24 arranged at the top ends of theribs 231 are also alternately staggered and oppositely arranged corresponding to the arrangement relationship of theribs 231 of the two rows of slidinggrooves 23. Specifically, the projections of the two rows of limiting teeth on the front surface of thelower frame plate 22 are sequentially and alternately arranged, so that the upper and lower rows of limiting teeth are spatially and alternately arranged in a staggered manner and opposite to each other.

Because the width of the limitingteeth 24 along the longitudinal direction of the bracket 20 (perpendicular to the longitudinal direction of the phase shift rack 40) is large, the projections of any two adjacent projections of the limitingteeth 24 overlap each other in the projection direction of the upper and lower rows of limitingteeth 24 on the front surface of thelower frame plate 22. Specifically, the projection of one limitingtooth 24 of one row of limiting teeth on the front surface of thelower frame plate 22 is adjacent to the projection of one limitingtooth 24 of the other row or the projection of two adjacent limitingteeth 24 on the front surface of thelower frame plate 22, and then the partial projection of one limitingtooth 24 of one row is overlapped with the partial projection of one limitingtooth 24 of the other row or the partial projection of two adjacent limitingteeth 24.

Specifically, when the projection of one of the limitingteeth 24 on the front surface of thelower frame plate 22 is adjacent to the projection of two adjacent limitingteeth 24 of the other row of limiting teeth, the projection of one of the limitingteeth 24 of the one row of limiting teeth is between the projections of two adjacent limitingteeth 24 of the other row, and the central axis of the projection of one of the limitingteeth 24 of the one row of limiting teeth along the longitudinal direction of thephase shift rack 40 coincides with the central axis of the projection of two adjacent limitingteeth 24 of the other row of limiting teeth along the longitudinal direction of thephase shift rack 40. And, the projections of the two rows of limit teeth in the vertical direction of thebracket 20 have a spacing.

Therefore, anaccommodating space 25 can be formed between one limitingtooth 24 of one row of limiting teeth and two adjacent limitingteeth 24 of the other row of limiting teeth adjacent to the front projection of the limiting teeth on the front surface of thelower frame plate 22. Theaccommodating space 25 is a space formed by three limitingteeth 24 in a triangular relationship, projections of the three limitingteeth 24 on the front surface of thelower frame plate 22 are adjacent to each other, and projections of the limitingteeth 24 located at the middle position (called as first limiting teeth 241) are overlapped with projections of the other two limiting teeth 24 (called as second limitingteeth 242 and third limitingteeth 243 respectively). Thefirst spacing tooth 241, thesecond spacing tooth 242 and thethird spacing tooth 243 are not located on the same row of spacing teeth when reflected to theaccommodating space 25. Eachaccommodating space 25 corresponds to onephase shift rack 40, and thephase shift rack 40 is disposed in the slidinggroove 23 formed by tworibs 231 corresponding to the second limitingteeth 242 and the third limitingteeth 243 in the same row.

In some embodiments, when theaccommodating space 25 is located at the end of thebracket 20 in the longitudinal direction, theaccommodating space 25 may further include a first limitingtooth 241, a second limitingtooth 242, and arib 231 of the slidinggroove 23 corresponding to the second limitingtooth 242 and not provided with the limitingtooth 24.

In an exemplary embodiment of the present invention, referring to fig. 3 and 4, the frequency-selective locking mechanism 30 includes a phase-shiftinggear 32 disposed therein and a locking member 31 disposed outside thereof. The frequency-selectinglocking mechanism 30 is arranged between the two rows of phase-shiftingracks 40, when the frequency-selectinglocking mechanism 30 moves along the longitudinal direction of thebracket 20, the phase-shiftinggear 32 is respectively meshed with any one phase-shiftingrack 40 of the two rows of phase-shiftingracks 40 through the twoopenings 33 on the frequency-selectinglocking mechanism 30, and the phase-shiftinggear 32 rotates, so that the phase-shiftingracks 40 are driven to move.

Referring to fig. 1, when the frequency-selective locking mechanism 30 enters into one of theaccommodating spaces 25, the phase-shiftinggear 32 in the frequency-selective locking mechanism 30 is engaged with the phase-shiftingrack 40 corresponding to theaccommodating space 25. In order to enable the frequency-selectinglocking mechanism 30 to be stably arranged in theaccommodating space 25, the transmission motion between the phase-shiftinggear 32 and the phase-shiftingrack 40 is stable. The locking member 31 can be locked with the first limitingteeth 241 forming theaccommodating space 25, so that the frequency-selectinglocking mechanism 30 can be stably disposed in theaccommodating space 25.

Specifically, the locking member 31 is provided with a lockingplane 313 locked with thelimit tooth 24, and thelimit tooth 24 is provided with alimit plane 244 corresponding to the lockingplane 313. After the frequency-selectinglocking mechanism 30 enters theaccommodating space 25, the lockingplane 313 of the locking piece 31 and the limitingplane 244 of the first limitingtooth 241 are in friction contact or interference fit, so that the locking piece 31 cannot easily cross the limitingplane 244 of the first limitingtooth 241, and the frequency-selectinglocking mechanism 30 can be stably arranged in theaccommodating space 25, so that the phase-shiftinggear 32 and the phase-shiftingrack 40 are stably meshed without shaking and the phase-shifting performance is affected.

In one embodiment, referring to fig. 1 and 5, the locking member 31 is in the shape of a boss, specifically a step. The limitingteeth 24 are also in a boss shape corresponding to the locking piece 31, and the locking piece 31 is connected with therib 231 of the slidinggroove 23 corresponding to the locking piece 31, and forms a T-shaped structure on the cross section.

In one embodiment, thelimit teeth 24 are disposed on one end of thebracket 20, and the lockingmember 24 is disposed on one end of the frequencyselective locking mechanism 30 corresponding to thelimit teeth 24 on one end of thebracket 20.

In an exemplary embodiment of the present invention, referring to fig. 1, a plurality of slidinggrooves 23 are formed in each of theupper frame plate 21 and thelower frame plate 22, a plurality ofribs 231 are correspondingly formed in the plurality of slidinggrooves 23, two adjacent slidinggrooves 23 share onerib 231, and eachrib 231 is correspondingly provided with one limitingtooth 24. Moreover, one limitingtooth 24 on theupper frame plate 21 and two limitingteeth 24 on thelower frame plate 22 adjacent to the limitingtooth 24 in the projection direction of thelower frame plate 22 can form an accommodating space 25 (the accommodating space is called as a first accommodating space 251); an accommodating space (called as a second accommodating space 252) can be formed between one limiting tooth on thelower frame plate 22 and two limitingteeth 24 on theupper frame plate 21 adjacent to the limiting tooth in the projection direction of thelower frame plate 22.

Thebracket 20 is provided with a plurality of firstaccommodating spaces 251 and a plurality of secondaccommodating spaces 252, and the plurality of firstaccommodating spaces 251 and the plurality of secondaccommodating spaces 252 are alternately arranged, so that the frequency-selectinglocking mechanism 30 can be sequentially aligned and meshed with one phase-shiftingrack 40 of a row of phase-shifting racks corresponding to the firstaccommodating spaces 251 and one phase-shiftingrack 40 of a row of phase-shifting racks corresponding to the secondaccommodating spaces 252.

Thefirst receiving space 251 and thesecond receiving space 252 are opposite in structure, and specifically, the first limitingtooth 2511 of thefirst receiving space 251 is disposed on theupper frame plate 21, the first limitingtooth 2521 of thesecond receiving space 252 is disposed on thelower frame plate 22, the second limiting tooth 2512 and the third limiting tooth 2513 of thefirst receiving space 251 are disposed on thelower frame plate 22, and the second limitingtooth 2522 and the third limitingtooth 2523 of thesecond receiving space 252 are disposed on theupper frame plate 21.

Referring to fig. 1, two limitingteeth 24 are shared between the adjacent first receivingspaces 251 and thesecond receiving spaces 252, the two shared limitingteeth 24 are respectively a first limitingtooth 2511 of thefirst receiving space 251 and a first limitingtooth 2521 of thesecond receiving space 252, that is, the first limitingtooth 2511 of thefirst receiving space 251 is a second limitingtooth 2522 or a third limitingtooth 2523 of thesecond receiving space 252, and the first limitingtooth 2521 of thesecond receiving space 252 is a second limiting tooth 2512 or a third limiting tooth 2513 of thefirst receiving space 251.

In the adjacentfirst receiving space 251 and second receivingspace 252, the projection of the first limitingtooth 2511 of thefirst receiving space 251 on the front surface of thelower frame plate 22 is adjacent to the projection of the first limitingtooth 2521 of thesecond receiving space 252 on the front surface of thelower frame plate 22, and the first limitingtooth 2511 of thefirst receiving space 251 and the first limitingtooth 2521 of thesecond receiving space 252 are arranged in a staggered manner, so that a transition position can be formed between the first limitingtooth 2511 of thefirst receiving space 251 and the first limitingtooth 2521 of thesecond receiving space 252, so that the frequency-selectinglocking mechanism 30 can move from thefirst receiving space 251 to thesecond receiving space 252.

The frequency-selectinglocking mechanism 30 is provided with two locking pieces 31, the two locking pieces 31 of the frequency-selectinglocking mechanism 30 are connected, and the two locking pieces 31 are in a symmetrical structure about the central axis of the longitudinal direction of thebracket 20. The two locking members 31 respectively face the reverse side of theupper frame plate 21 and the front side of thelower frame plate 22, the locking member facing the reverse side of theupper frame plate 21 is referred to as afirst locking member 311, and the locking member facing the front side of thelower frame plate 22 is referred to as asecond locking member 312.

When the frequency-selectinglocking mechanism 30 enters the firstaccommodating space 251 and the phase-shiftinggear 32 is engaged with the phase-shiftingrack 40 corresponding to the firstaccommodating space 251, thefirst locking member 311 is locked with the first limiting tooth of the firstaccommodating space 251, thesecond locking member 312 is opposite to the second limiting tooth 2512 and the third limiting tooth 2513 of the firstaccommodating space 251 in orientation, and thesecond locking member 312 is not contacted with the second limiting tooth 2512 and the third limiting tooth 2513, that is, thesecond locking member 312 is not contacted with the slidingslot 23 corresponding to the second limiting tooth 2512 and the third limiting tooth 2513, further, thesecond locking member 312 is not contacted with the phase-shiftingrack 40 located in the slidingslot 23, so that the second limiting tooth 2512 and the third limiting tooth 2513 do not interfere with the engagement between the phase-shiftinggear 32 and the phase-shiftingrack 40. That is, thesecond lock member 312 has an escape clearance from thephase shift rack 40 engaged with thephase shift gear 32, so that thesecond lock member 312 does not interfere with the transmission relationship between thephase shift gear 32 and thephase shift gear 32.

When the frequency-selectinglocking mechanism 30 enters the secondaccommodating space 252 and the phase-shiftinggear 32 is engaged with the phase-shiftingrack 40 corresponding to the secondaccommodating space 252, thesecond locking member 312 is locked with the first limitingtooth 2521 of the secondaccommodating space 252, thefirst locking member 311 is opposite to the second limitingtooth 2522 and the third limitingtooth 2523 of the secondaccommodating space 252 in orientation, thefirst locking member 311 is not in contact with the second limitingtooth 2522 and the third limitingtooth 2523, that is, thefirst locking member 311 is not in contact with the slidingslot 23 corresponding to the second limitingtooth 2522 and the third limitingtooth 2523, further, thefirst locking member 311 is not in contact with the phase-shiftingrack 40 located in the slidingslot 23, so that the second limitingtooth 2522 and the third limitingtooth 2523 do not interfere with the engagement between thegear 32 and the phase-shiftingrack 40. That is, thefirst locking member 311 has an escape gap with theshift rack 40 engaged with theshift gear 32, so that thefirst locking member 311 does not interfere with the transmission relationship between theshift gear 32 and theshift gear 32.

Therefore, the frequency-selectinglocking mechanism 30 can be locked in the firstaccommodating space 251 and the secondaccommodating space 252 by the locking piece 31 of the frequency-selecting locking mechanism to be in contact with one limitingtooth 24, so that when the frequency-selectinglocking mechanism 30 is meshed with the phase-shiftingrack 40 corresponding to theaccommodating space 25, the phase-shiftingrack 40 can be stably meshed, and the phase-shifting precision is improved.

A transition position is arranged between the adjacentfirst accommodation space 251 andsecond accommodation space 252, and the height of the transition position in the vertical direction of thebracket 20 is greater than or equal to the vertical distance between the lockingplane 313 of thefirst locking piece 311 and the lockingplane 313 of thesecond locking piece 312, so that the connectedfirst locking piece 311 andsecond locking piece 312 can enter thefirst accommodation space 251 orsecond accommodation space 252 through the transition position and are locked with thefirst locking piece 311 of thefirst accommodation space 251 or thefirst locking piece 311 of thesecond accommodation space 252. The transition position is set so that the frequency-selective locking mechanism 30 can be easily moved from the firstaccommodating space 251 to the secondaccommodating space 252, or the frequency-selective locking mechanism 30 can be easily moved from the secondaccommodating space 252 to the firstaccommodating space 251.

In an exemplary embodiment of the present invention, with reference to fig. 2 and 6, the hatched portion in fig. 2 is a structural schematic diagram of the rear end of the stent, and the unshaded portion is a structural schematic diagram of the front end of the stent; thebracket 20 is further provided with a stabilizingtooth 26 corresponding to therib 231 of the slidingchute 23, and the stabilizingtooth 26 extends to the top of therib 231 towards the oppositeupper frame plate 21 or the oppositelower frame plate 22. Theribs 231 of the two rows of slidinggrooves 23 on thesupport 20 are correspondingly provided with the stabilizingteeth 26, the structure of each stabilizingtooth 26 is the same, the orientation of the stabilizingteeth 26 in different rows is opposite, and the distance between any two adjacent stabilizingteeth 26 in the same row is equal. Specifically, the arrangement structure of the two rows of stabilizingteeth 26 may be referred to the arrangement structure of the two rows of limitingteeth 24, which is not described herein for brevity.

A stabilizingspace 27 may be formed between one stabilizingtooth 26 of one row and two adjacent stabilizingteeth 26 of the other row which are adjacent to the other row in projection on the front surface oflower shelf 22. The stabilizingspace 27 is a space formed by three stabilizingteeth 26 in a triangular relationship, and the projections of the three stabilizingteeth 26 on the front surface of thelower frame plate 22 are adjacent to each other, and the projection of the stabilizingtooth 26 at the middle position (the stabilizing tooth is referred to as a first stabilizing tooth 261) overlaps with the projection of the other two stabilizing teeth 26 (the two stabilizing teeth are referred to as a second stabilizingtooth 262 and a third stabilizing tooth 263). Reflecting to the stable space, the firststable tooth 261 is not in the same row with the secondstable tooth 262 and the thirdstable tooth 263, eachstable space 27 corresponds to onephase shift rack 40, and thephase shift rack 40 is in the slidingslot 23 formed by tworibs 231 corresponding to the secondstable tooth 262 and the thirdstable tooth 263 in the same row.

The stabilizingspace 27 can be divided into a first stabilizingspace 271 and a second stabilizingspace 272, the first stabilizingtooth 2711 of the first stabilizingspace 271 is located on theupper frame plate 21, and the second stabilizingtooth 2712 and the third stabilizingtooth 2713 of the first stabilizingspace 271 are located on thelower frame plate 22; first stabilizingtooth 2721 of second stabilizingspace 272 resides onlower frame plate 22, and second stabilizingtooth 2722 and third stabilizingtooth 2723 of second stabilizingspace 272 reside onupper frame plate 21. The relationship between the firststable space 271 and the secondstable space 272 can refer to the relationship between the firstaccommodating space 251 and the secondaccommodating space 252, and will not be described herein for brevity.

The frequency-selectinglocking mechanism 30 is provided with abalance piece 34 corresponding to the stabilizingtooth 26. Referring to fig. 2, after the frequency-selective locking mechanism 30 enters astable space 27, thebalance member 34 can cooperate with the threestable teeth 26 of thestable space 27, so that the frequency-selective locking mechanism 30 can stably move along the longitudinal direction of thebracket 20 without jumping or shaking, and the like, thereby affecting the transmission of the phase-shiftinggear 32 and the phase-shiftingrack 40, and further the phase-shifting performance of the phase-shifting part connected with the phase-shiftingrack 40.

In particular, the stabilizingtooth 26 is provided with a stabilizingplane 264, the balancingmember 34 is provided with a balancingplane 343 corresponding to the stabilizingplane 264, and the stabilizingplane 264 is arranged in parallel with the balancingplane 343. After the frequency-selective locking mechanism 30 enters thestable space 27, thebalance plane 343 of thebalance 34 of the frequency-selective locking mechanism 30 faces thestable plane 264 of the firststable tooth 261 of thestable space 27, and thebalance plane 343 is in clearance fit with thestable plane 264 of the firststable tooth 261 to prevent the frequency-selective locking mechanism 30 from shaking. In one embodiment, the balancing member is in the form of a boss protruding from therib 231.

In some embodiments, when the stabilizingspace 27 is located at the end of thebracket 20 in the longitudinal direction, the stabilizingspace 27 may further be composed of the first stabilizingtooth 261 and the second stabilizingtooth 262, and therib 231 of theslide groove 23 corresponding to the second stabilizingtooth 262, which is not provided with the stabilizingtooth 26.

The frequency-selective locking mechanism 30 has twobalance members 34, the twobalance members 34 are connected, and the twobalance members 34 are symmetrical about a central axis of the longitudinal direction of thebracket 20. The twobalance members 34 are respectively facing the reverse side of theupper shelf 21 and the front side of thelower shelf 22, thebalance member 34 facing the reverse side of theupper shelf 21 is referred to as afirst balance member 341, and thebalance member 34 facing the front side of thelower shelf 22 is referred to as asecond balance member 342.

When the frequencyselective locking mechanism 30 enters the first stabilizingspace 271, thebalance plane 343 of thefirst balancing member 341 faces the stabilizingplane 264 of the first stabilizingtooth 2711 of the first stabilizingspace 271, but thefirst balancing member 341 is in clearance fit with the first stabilizingtooth 2711, the projection of thefirst balancing member 341 on the front surface of thelower rack 20 coincides with the projection of the first stabilizingtooth 2711 on the front surface of thelower rack 20, and thebalance plane 343 of thesecond balancing member 342 faces between the stabilizingplane 264 of the second stabilizingtooth 2712 and the stabilizingplane 264 of the third stabilizingtooth 2713, but is in clearance fit.

When the frequency-selectinglocking mechanism 30 enters the secondstable space 272, the relationship between thesecond balance piece 342 and the first stabilizingtooth 2721 of the secondstable space 272 can be referred to the relationship between thefirst balance piece 341 and the first stabilizingtooth 2711 when the frequency-selectinglocking mechanism 30 enters the firststable space 271; the relationship between thefirst balance member 341 and the second stabilizingtooth 2722 and the third stabilizingtooth 2723 of the second stabilizingspace 272 can be referred to the relationship between thesecond balance member 342 and the second stabilizingtooth 2712 and the third stabilizingtooth 2713 when the frequency-selectinglocking mechanism 30 enters the first stabilizingspace 271, and the details thereof are not repeated.

The stabilizingflats 264 of the stabilizingteeth 26 in the same row are coplanar, whereby the stabilizingflats 264 of the plurality of stabilizingteeth 26 in the same row form a sliding surface and the sliding surfaces of the two rows of stabilizing teeth form anescape channel 28. The connectedfirst balance member 341 and thesecond balance member 342 can pass through the avoidingchannel 28, and the avoidingchannel 28 can simultaneously restrain and limit thefirst balance member 341 and thesecond balance member 342, and can play a role in guiding the operation of the frequency-selectinglocking mechanism 30. Preferably, thebypass channel 28 is generally rectangular in shape to facilitate the passage of a regularly shaped frequencyselective locking mechanism 30 therethrough.

The firstaccommodating space 251 corresponds to the firststable space 271 of the tworibs 231 residing in the same slidingslot 23, and when thephase shift gear 32 of the frequency-selectinglocking mechanism 30 is engaged with thephase shift rack 40 in the slidingslot 23, the frequency-selectinglocking mechanism 30 enters the corresponding firstaccommodating space 251 and the firststable space 271 at the same time; the secondaccommodating space 252 corresponds to the secondstable space 272 of the tworibs 231 residing in the same slidingslot 23, and when thephase shift gear 32 of the frequency-selectinglocking mechanism 30 is engaged with thephase shift rack 40 in the slidingslot 23, the frequency-selectinglocking mechanism 30 enters the corresponding secondaccommodating space 252 and the secondstable space 272 at the same time.

The two locking members 31 and the two balancingmembers 34 of the frequency-selective locking mechanism 30 are respectively disposed at two ends of the frequency-selective locking mechanism 30 along the longitudinal direction of the phase-shift rack 40.

In one embodiment, the stabilizingteeth 26 of thebracket 20 may be replaced with the limitingteeth 24, such that the limitingteeth 24 may be disposed on both lengthwise ends of thebracket 20 to further limit the frequencyselective locking mechanism 30.

In one embodiment, the limitingteeth 24 can be disposed at the middle of thebracket 20 along the longitudinal direction of thephase shift rack 40, and the locking member 31 of the frequency-selective locking mechanism is disposed at the middle of the frequency-selective locking mechanism 30 along the longitudinal direction of thephase shift rack 40 corresponding to the limitingteeth 24 disposed at the middle of thebracket 20.

Referring to fig. 3 and 4, the frequency-selective locking mechanism 30 includes abox 37. The lock member 31 and thebalance member 34 are respectively disposed at two ends of thebox body 37 along the longitudinal direction of thephase shift rack 40, thephase shift gear 32 is disposed in thebox body 37, thebox body 37 is provided with twoopenings 33 corresponding to the external teeth of thephase shift gear 32, the twoopenings 33 respectively face the back surface of theupper frame plate 21 and the front surface of thelower frame plate 22, so that thephase shift gear 32 can expose its external teeth through theopenings 33 to be engaged with any one of the phase shift racks 40 disposed on theupper frame plate 21, or thephase shift gear 32 can be engaged with any one of the phase shift racks 40 disposed on thelower frame plate 22 through its external teeth.

Thebox body 37 further comprises aposition selecting gear 35 arranged in the box body, theposition selecting gear 35 is meshed with thephase shifting gear 32, and theposition selecting gear 35 can drive thebox body 37 to move linearly along the longitudinal direction of thebracket 20, so that thephase shifting gear 32 can be respectively meshed with any onephase shifting rack 40 on theupper frame plate 21 or thelower frame plate 22.

The phase-shifting frequency-selectingdevice 10 further comprises a transmission shaft and a transmission screw. The gear hole of theposition selecting gear 35 is a threaded hole, theposition selecting gear 35 is sleeved on the transmission screw through the gear hole of the position selecting gear to form a screw mechanism, the transmission screw is rotated to drive theposition selecting gear 35 to move linearly, and theposition selecting gear 35 further drives the frequency selectinglocking mechanism 30 to move linearly.

Thephase shift gear 32 is sleeved on the transmission shaft through a gear hole of the phase shift gear. When theposition selecting gear 35 drives thebox body 37 to move, so that thephase shifting gear 32 is meshed with any onephase shifting rack 40, the transmission screw and the transmission shaft are driven simultaneously, thephase shifting gear 32 and theposition selecting gear 35 only rotate circumferentially, thephase shifting gear 32 rotates circumferentially, thephase shifting rack 40 is driven to move linearly, and thephase shifting rack 40 drives a phase shifting part connected with the phase shifting rack to perform phase shifting. Preferably, the gear hole of thephase shift gear 32 is a hexagonal hole, and the transmission shaft is a hexagonal cylinder.

In one embodiment, the phase shift frequency-selective device 10 has a plurality of frequency-selective locking mechanisms 30, the plurality of frequency-selective locking mechanisms 30 are arranged side by side along the longitudinal direction of thebracket 20, and the plurality of frequency-selective locking mechanisms 30 can be linked by a linkage, that is, the plurality of frequency-selective locking mechanisms 30 can move synchronously. Preferably, thebox body 37 has alinkage hole 36, the linkage piece is a linkage shaft, and the linkage shaft passes through thelinkage hole 36 of thebox body 37 of the multiple frequency-selectinglocking mechanisms 30 to link the multiple frequency-selectinglocking mechanisms 30.

In a further embodiment, the phase shifting frequency-selective device 10 has two frequency-selective locking mechanisms 30 therein, and the two frequency-selective locking mechanisms 30 are configured to: when one of the frequency-selective locking mechanisms 30 is engaged with one of the phase-shiftingracks 40, the other frequency-selective locking mechanism 30 is not engaged with any one of the phase-shiftingracks 40. Alternatively, when one of the frequencyselective locking mechanisms 30 is engaged with one of the phase shift racks 40, the other frequencyselective locking mechanism 30 is also engaged with any one of the phase shift racks 40.

In one embodiment, the frequency-selective locking mechanism 30 is further provided with a fixingcomponent 41. Thephase shift rack 40 is fixed and clamped by anelastic buckle 411 in the fixingpart 41, so that thephase shift rack 40 cannot move freely when not meshed with thephase shift gear 32. The frequency-selectinglocking mechanism 30 is provided with a jacking member, when the phase-shiftinggear 32 is in aligned engagement with the phase-shiftingrack 40, the jacking member can jack up the fixingpart 41, and theelastic buckle 411 of the fixingpart 41 releases the phase-shiftingrack 40, so that the phase-shiftingrack 40 is in a movable state.

In one embodiment, a connectingsection 29 may be disposed between two adjacent limiting teeth of the same row of the frequency-selective locking mechanism 30 to form a closed space for disposing the phase-shiftingrack 40, so as to restrict the phase-shiftingrack 40 from moving linearly only along the longitudinal direction thereof, but not toward the vertical direction of thebracket 20.

The invention also provides a multi-frequency antenna, which comprises a plurality of phase-shifting parts corresponding to a plurality of frequency bands and the phase-shifting frequency-selecting device. Each phase shift part is respectively connected with a phase shift rack of the phase shift frequency selection device, and the phase shift rack drives the phase shift part to move by controlling the motion of the phase shift rack so as to implement phase shift.

In one embodiment, with reference to fig. 9, the multi-frequency antenna may be provided with two or more phase-shifting frequency-selecting devices arranged side by side to improve the utilization of the multi-frequency antenna.

In summary, the frequency-selecting locking mechanism of the phase-shifting frequency-selecting device of the invention is in frictional contact with the limiting teeth on the bracket through the locking piece, so that when the phase-shifting gear of the frequency-selecting phase-shifting mechanism is meshed with any one phase-shifting rack, the frequency-selecting phase-shifting mechanism can be locked and fixed, and the frequency-selecting phase-shifting mechanism can stably drive the phase-shifting rack, thereby stabilizing the phase-shifting performance.

The foregoing description is only exemplary of the preferred embodiments of the invention and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention according to the present invention is not limited to the specific combination of the above-mentioned features, but also encompasses other embodiments in which any combination of the above-mentioned features or their equivalents is possible without departing from the scope of the invention as defined by the appended claims. For example, the above features and (but not limited to) features having similar functions of the present invention are mutually replaced to form the technical solution.

Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims (18)

1. The utility model provides a phase-shifting frequency-selecting device, includes support and frequency-selecting locking mechanism, the support is used for supporting two rows of racks that shift the phase, and two rows of racks that shift the phase are crisscross setting in opposite directions each other, the support is formed with the confession frequency-selecting locking mechanism is along the passageway of two rows of arrangement direction straight line operation that shift the phase rack, its characterized in that: the frequency-selecting locking mechanism comprises a phase-shifting gear which is suitable for being meshed with any one of the phase-shifting racks, and a locking piece which is suitable for being abutted against limiting teeth provided by the support at the position opposite to the meshed phase-shifting racks.

2. The phase shifting frequency-selective device according to claim 1, wherein when said frequency-selective locking mechanism is in a state of being engaged with one of the phase shifting racks, an avoidance gap is provided between said locking member and the engaged phase shifting rack.

3. The phase shifting frequency-selective device according to claim 1, wherein the bracket is provided with the limiting teeth on at least one side of each phase shifting rack in the arrangement direction, and the limiting teeth on two sides of at least one phase shifting rack and the limiting teeth on the opposite positions of the phase shifting rack form a containing space of the locking mechanism together.

4. The phase shifting frequency-selective device according to claim 1, wherein the lock member and the limit teeth are disposed at an end of the bracket, which is located at an end to which a longitudinal direction of the phase shifting rack is directed.

5. The phase shifting frequency-selective device according to claim 4, wherein the frequency-selective locking mechanism further comprises a balance member disposed at the other end opposite to the end where the locking member is disposed, and sliding on an avoidance groove formed at the other end of the bracket when the frequency-selective locking mechanism is linearly operated.

6. The phase shifting frequency selective device according to claim 5, wherein the balance member has a regular rectangular profile, and the escape channels of the brackets allow the balance member to slide with the regular rectangular profile.

7. The phase shifting frequency-selecting device according to claim 1, wherein said locking member is in the form of a boss, and said limit teeth are in the form of a boss corresponding to said locking member.

8. The phase shifting frequency-selective device according to claim 7, wherein said lock member has a lock surface, said limit tooth has a limit surface, and said lock surface is in frictional contact with said limit surface when said frequency-selective lock mechanism is in a state of being engaged with one of said phase shifting racks.

9. The phase shifting frequency-selective device according to claim 4, wherein said frequency-selective locking mechanism has two locking members which are symmetrically arranged in said arrangement direction and are fixedly connected.

10. The phase shifting frequency-selective device according to claim 1, wherein the phase shifting frequency-selective device comprises two frequency-selective locking mechanisms linked side by side in the arrangement direction, and is configured such that when one of the frequency-selective locking mechanisms is engaged with one of the phase shifting racks, the other frequency-selective locking mechanism is not engaged with either one of the phase shifting racks, or the other frequency-selective locking mechanism is engaged with the other phase shifting rack.

11. The phase shifting frequency-selecting device according to claim 5, wherein the bracket is provided with a sliding groove for accommodating the phase shifting rack for each phase shifting rack, a rib is formed between two adjacent sliding grooves, and the limiting teeth are arranged on the rib.

12. The phase shifting frequency-selective device according to claim 11, wherein said slide groove is provided at the other end thereof away from said stopper teeth in the longitudinal direction thereof with stabilizing teeth provided on said rib, and outer side surfaces of all stabilizing teeth of the same row of slide grooves are located on the same plane for defining one side of said escape channel.

13. The phase shifting frequency-selective device according to claim 12, wherein when said frequency-selective locking mechanism is engaged with one of the phase shifting racks, the locking member of the frequency-selective locking mechanism is in interference fit with the limit tooth to achieve said frictional contact under the constraint that the balance member of the frequency-selective locking mechanism is in positioning engagement with the stabilizing tooth.

14. The phase shifting frequency-selective device according to claim 5, wherein the frequency-selective locking mechanism comprises a box body, the phase shifting gear is arranged in the box body, the box body is provided with two openings corresponding to the two rows of phase shifting racks, and part of external teeth of the phase shifting gear are exposed to the outside through the two openings so as to be meshed with the phase shifting racks.

15. The phase shifting frequency-selective device according to claim 10, wherein the two frequency-selective locking mechanisms are connected by a linkage so that the two frequency-selective locking mechanisms perform linear motion simultaneously.

16. The phase shifting frequency selecting device according to claim 1, wherein each phase shifting rack is used for linking the phase shifting part of the antenna of one frequency band.

17. The phase shifting frequency selecting device according to any one of claims 1 to 16, further comprising a transmission shaft and a transmission screw, wherein the frequency selecting locking mechanism is further provided with a position selecting gear engaged with the phase shifting gear, the position selecting gear is sleeved on the transmission screw through a threaded hole of the position selecting gear to form a screw mechanism, and the transmission screw is rotated to drive the frequency selecting locking mechanism to linearly run to be engaged with any one of the phase shifting racks; the phase shift gear is sleeved on the transmission shaft through a gear hole of the phase shift gear, the transmission screw and the transmission shaft are driven simultaneously, and the phase shift gear drives the meshed phase shift rack to move.

18. A multi-frequency antenna comprising a plurality of phase shifting sections corresponding to a plurality of frequency bands, comprising the phase shifting frequency selecting device according to any one of claims 1 to 17, wherein each of the phase shifting sections has a phase shifting rack corresponding to one of the phase shifting frequency selecting devices and is linked with the phase shifting rack.

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