CN113922013B

CN113922013B - Phase-shifting frequency-selecting device and multi-frequency antenna

Info

Publication number: CN113922013B
Application number: CN202111161407.9A
Authority: CN
Inventors: 黄潮生; 洪声锐
Original assignee: Comba Telecom Technology Guangzhou Ltd; Jingxin RF Technology Guangzhou Co ltd
Current assignee: Comba Telecom Technology Guangzhou Ltd; Jingxin RF Technology Guangzhou Co ltd
Priority date: 2021-09-30
Filing date: 2021-09-30
Publication date: 2022-10-25
Anticipated expiration: 2041-09-30
Also published as: CN113922013A

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 provided by the invention 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, and the frequency-selecting phase-shifting mechanism can stably drive the phase-shifting rack, thereby ensuring that 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 in 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 bracket and a frequency-selecting locking mechanism, wherein the bracket 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 bracket 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 bracket at the opposite position of the meshed phase-shifting racks.

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 boss-shaped, and the limiting teeth correspond to the locking piece which is boss-shaped.

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 the other frequency selection locking mechanism is configured not to be meshed with any one phase shift rack when one frequency selection locking mechanism is meshed with one phase shift rack, or the other frequency selection locking mechanism is meshed 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 frictional 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 with a phase shift component of the antenna of one frequency band.

Specifically, the phase-shifting and frequency-selecting device further comprises a transmission shaft and a transmission screw, the frequency-shifting and 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-shifting and frequency-selecting locking mechanism to linearly run and be meshed with any one phase-shifting rack; the phase-shifting gear is sleeved on the transmission shaft through a gear hole of the phase-shifting gear, and simultaneously drives the transmission screw and the transmission shaft, and the phase-shifting gear drives the engaged phase-shifting 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. Frequency-selecting locking mechanism is inconsistent through its lock piece and the spacing tooth on the support to when making phase shift gear and arbitrary one phase shift rack mesh mutually in alignment, spacing tooth and lock piece are retrained each other, so that phase shift gear can mesh with the phase shift rack steadily, and can not produce mechanical factor that influences the phase shift performance such as shake or beat when phase shift gear and phase shift rack mesh transmission mutually, thereby make the implementation that phase shift frequency-selecting device can be stable phase shift.

Secondly, a plurality of limiting teeth of the phase-shifting and 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 the phase-shifting locking mechanism of the phase-shifting frequency-selecting device can be matched with the locking piece to limit when being meshed with any one phase-shifting rack, and the problems of influencing phase-shifting performance and the like due to jitter and the like can be avoided.

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 above 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 selection device of the 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 multiple 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 can 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 frequency selective device 10 includes a bracket 20, a frequency selective locking mechanism 30, a phase shifting rack 40 and a transmission mechanism.

Referring to fig. 1, the bracket 20 is hollow so as to support the frequency-selecting locking mechanism 30, the phase-shifting rack 40 and the transmission mechanism. The outer contour of the bracket 20 is approximately rectangular parallelepiped with a longitudinal shape, the bracket 20 includes an upper frame plate 21 and a lower frame plate 22, and the back surface of the upper frame plate 21 faces the front surface of the lower frame plate 22.

The phase shift rack 40 is connected with a phase shift component of the antenna, and the phase 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 the phase shift rack 40 has external teeth, and one end of the phase shift rack 40 is connected to the phase shift part.

The bracket 20 is provided with a sliding groove 23 for a moving path of the phase shift rack 40, so that the phase shift rack 40 can be stably arranged on the bracket 20, the phase shift rack 40 can slide through the sliding groove 23, and the moving path of the phase 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 the upper frame plate 21 and the front surface of the lower frame plate 22, respectively, and the upper frame plate 21 and the lower frame plate 22 are respectively provided with the sliding grooves 23 for the phase shift racks 40 disposed thereon to slide. The sliding groove 23 on the reverse side of the upper frame plate 21 is arranged to protrude towards the front side of the lower frame plate 22, and the sliding groove 23 on the front side of the lower frame plate 22 is arranged to protrude towards the reverse side of the upper frame plate 22.

Referring to fig. 5 and 6, the sliding groove 23 includes two ribs 231, and the two ribs 231 are disposed to protrude toward the opposite upper shelf 21 or lower shelf 22 so as to form the sliding groove 23 protruding from the upper shelf 21 or lower shelf 22. The two ribs 231 of the slide groove 23 are parallel to each other, and the two ribs 231 are symmetrical to each other about the central axis of the phase 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 sliding slots 23 in the same row are convenient to arrange, so that one rib 231 is shared between two adjacent sliding slots 23 in the same row, thereby saving the space of the bracket 20, reducing the volume of the bracket 20, and facilitating the miniaturization of the phase shift frequency 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 the lower 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 one phase shift rack 40 disposed on the upper frame plate 21 on the front surface of the lower frame plate 22 is adjacent to the projection of one phase shift rack 40 or two adjacent phase shift racks 40 on the lower frame plate 22 on the front surface of the lower 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, the bracket 20 is provided with two rows of sliding grooves 23 corresponding to the two rows of phase shift racks 40, and respectively arranged on the upper frame plate 21 and the lower frame plate 22 for accommodating the two rows of phase shift racks 40. The two rows of sliding chutes 23 may be correspondingly referred to the arrangement of the two rows of phase-shifting racks 40, that is, the two rows of sliding chutes 23 are spatially alternately arranged in a staggered manner.

Because the two rows of sliding grooves 23 are staggered and arranged oppositely, and two adjacent sliding grooves 23 in the same row share one rib 231, the ribs 231 of the two rows of sliding grooves 23 are also staggered and arranged oppositely in sequence in space. That is, the projections of the ribs 231 of the two rows of sliding grooves 23 on the front surface of the lower frame plate 22 are sequentially and alternately arranged, and the distances between the projections of any two adjacent ribs 231 in the projection direction are the same.

The bracket 20 is further provided with a limiting tooth 24 on the rib 231 of the sliding groove 23, and the limiting tooth 24 extends from the top of the rib 231 to the opposite direction of the upper frame plate 21 or the lower frame plate 22. The ribs 231 of the two rows of sliding grooves 23 on the bracket 20 are correspondingly provided with the limiting teeth 24, the structure of each limiting tooth 24 is the same, and the directions of the limiting teeth 24 in different rows are opposite. The spacing between any two adjacent spacing teeth 24 in the same row is equal.

Because the ribs 231 of the two rows of sliding grooves 23 are alternately staggered and arranged oppositely, the limit teeth 24 arranged at the top ends of the ribs 231 are also arranged oppositely and alternately staggered and arranged oppositely corresponding to the arrangement relationship of the ribs 231 of the two rows of sliding grooves 23. Specifically, the projections of the two rows of limiting teeth on the front surface of the lower 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 limiting teeth 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 limiting teeth 24 are overlapped with each other in the projection direction of the upper and lower rows of limiting teeth 24 on the front surface of the lower frame plate 22. Specifically, the projection of one of the limiting teeth 24 of one of the rows of limiting teeth on the front surface of the lower shelf 22 is adjacent to the projection of one of the limiting teeth 24 of the other row or the projection of two adjacent limiting teeth 24 on the front surface of the lower shelf 22, and then the partial projection of one of the limiting teeth 24 of one of the rows overlaps with the partial projection of one of the limiting teeth 24 of the other row or the partial projections of two adjacent limiting teeth 24.

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

Thus, an accommodating space 25 can be formed between one limiting tooth 24 of one row of limiting teeth and two adjacent limiting teeth 24 of the other row of limiting teeth adjacent to the front projection of the limiting teeth on the front surface of the lower frame plate 22. The accommodating space 25 is a space formed by three limiting teeth 24 in a triangular relationship, projections of the three limiting teeth 24 on the front surface of the lower frame plate 22 are adjacent to each other, and projections of the limiting teeth 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 limiting teeth 242 and third limiting teeth 243 respectively). The first spacing tooth 241, the second spacing tooth 242 and the third spacing tooth 243 are not located on the same row of spacing teeth when reflected to the accommodating space 25. Each accommodating space 25 corresponds to one phase shift rack 40, and the phase shift rack 40 is disposed in the sliding groove 23 formed by two ribs 231 corresponding to the second limiting teeth 242 and the third limiting teeth 243 in the same row.

In some embodiments, when the accommodating space 25 is located at the end of the bracket 20 in the longitudinal direction, the accommodating space 25 may further include a first limiting tooth 241, a second limiting tooth 242, and a rib 231 of the sliding groove 23 corresponding to the second limiting tooth 242 and not provided with the limiting tooth 24.

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

Referring to fig. 1, when the frequency-selective locking mechanism 30 enters into one of the accommodating spaces 25, the phase-shifting gear 32 in the frequency-selective locking mechanism 30 is engaged with the phase-shifting rack 40 corresponding to the accommodating space 25. In order to stably arrange the frequency-selecting locking mechanism 30 in the accommodating space 25, the transmission motion between the phase-shifting gear 32 and the phase-shifting rack 40 is stable. The locking member 31 can be locked with the first limiting teeth 241 forming the accommodating space 25, so that the frequency-selecting locking mechanism 30 can be stably disposed in the accommodating space 25.

Specifically, the locking member 31 is provided with a locking plane 313 locked with the limit tooth 24, and the limit tooth 24 is provided with a limit plane 244 corresponding to the locking plane 313. After the frequency-selecting locking mechanism 30 enters the accommodating space 25, the locking plane 313 of the locking piece 31 and the limiting plane 244 of the first limiting tooth 241 are in friction contact or interference fit, so that the locking piece 31 cannot easily cross the limiting plane 244 of the first limiting tooth 241, and the frequency-selecting locking mechanism 30 can be stably arranged in the accommodating space 25, so that the phase-shifting gear 32 and the phase-shifting rack 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 limiting teeth 24 are also in a boss shape corresponding to the locking piece 31, and the locking piece 31 is connected with the rib 231 of the sliding groove 23 corresponding to the locking piece 31, and forms a T-shaped structure on the cross section.

In one embodiment, the limiting teeth 24 are disposed on one end of the bracket 20, and the locking member 24 is disposed on one end of the frequency-selective locking mechanism 30 corresponding to the limiting teeth 24 on one end of the bracket 20.

In an exemplary embodiment of the present invention, referring to fig. 1, a plurality of sliding grooves 23 are formed in each of the upper frame plate 21 and the lower frame plate 22, a plurality of ribs 231 are correspondingly formed in the plurality of sliding grooves 23, two adjacent sliding grooves 23 share one rib 231, and each rib 231 is correspondingly provided with one limiting tooth 24. Moreover, one limiting tooth 24 on the upper frame plate 21 and two limiting teeth 24 on the lower frame plate 22 adjacent to the limiting tooth 24 in the projection direction of the lower frame plate 22 can form an accommodating space 25 (the accommodating space is called as a first accommodating space 251); an accommodating space (referred to as a second accommodating space 252) can be formed between one limiting tooth on the lower frame plate 22 and two limiting teeth 24 on the upper frame plate 21 adjacent to the limiting tooth in the projection direction of the lower frame plate 22.

The bracket 20 is provided with a plurality of first accommodating spaces 251 and a plurality of second accommodating spaces 252, and the plurality of first accommodating spaces 251 and the plurality of second accommodating spaces 252 are alternately arranged, so that the frequency-selecting locking mechanism 30 can be sequentially meshed with one phase-shifting rack 40 of a row of phase-shifting racks corresponding to the first accommodating spaces 251 and meshed with one phase-shifting rack 40 of a row of phase-shifting racks corresponding to the second accommodating spaces 252 in an aligned manner.

The first receiving space 251 and the second receiving space 252 are opposite, and more specifically, the first limiting tooth 2511 of the first receiving space 251 is disposed on the upper frame plate 21, the first limiting tooth 2521 of the second receiving space 252 is disposed on the lower frame plate 22, the second limiting tooth 2512 and the third limiting tooth 2513 of the first receiving space 251 are disposed on the lower frame plate 22, and the second limiting tooth 2522 and the third limiting tooth 2523 of the second receiving space 252 are disposed on the upper frame plate 21.

With reference to fig. 1, two limiting teeth 24 are shared between the adjacent first accommodating spaces 251 and the second accommodating spaces 252, the two shared limiting teeth 24 are respectively a first limiting tooth 2511 of the first accommodating space 251 and a first limiting tooth 2521 of the second accommodating space 252, that is, the first limiting tooth 2511 of the first accommodating space 251 is a second limiting tooth 2522 or a third limiting tooth 2523 of the second accommodating space 252, and the first limiting tooth 2521 of the second accommodating space 252 is a second limiting tooth 2512 or a third limiting tooth 2513 of the first accommodating space 251.

In the adjacent first receiving space 251 and second receiving space 252, the projection of the first limiting tooth 2511 of the first receiving space 251 on the front surface of the lower frame plate 22 is adjacent to the projection of the first limiting tooth 2521 of the second receiving space 252 on the front surface of the lower frame plate 22, and the first limiting tooth 2511 of the first receiving space 251 and the first limiting tooth 2521 of the second receiving space 252 are arranged in a staggered manner, so that a transition position can be formed between the first limiting tooth 2511 of the first receiving space 251 and the first limiting tooth 2521 of the second receiving space 252, so that the frequency-selecting locking mechanism 30 can move from the first receiving space 251 to the second receiving space 252.

The frequency-selecting locking mechanism 30 is provided with two locking pieces 31, the two locking pieces 31 of the frequency-selecting locking mechanism 30 are connected, and the two locking pieces 31 are in a symmetrical structure about the central axis of the bracket 20 in the longitudinal direction. The two locking members 31 respectively face the reverse side of the upper frame plate 21 and the front side of the lower frame plate 22, the locking member facing the reverse side of the upper frame plate 21 is referred to as a first locking member 311, and the locking member facing the front side of the lower frame plate 22 is referred to as a second locking member 312.

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

When the frequency-selecting locking mechanism 30 enters the second accommodating space 252 and the phase-shifting gear 32 is engaged with the phase-shifting rack 40 corresponding to the second accommodating space 252, the second locking piece 312 is locked with the first limit tooth 2521 of the second accommodating space 252, the first locking piece 311 is opposite to the second limit tooth 2522 and the third limit tooth 2523 of the second accommodating space 252 in orientation, the first locking piece 311 is not in contact with the second limit tooth 2522 and the third limit tooth 2523, that is, the first locking piece 311 is not in contact with the sliding slot 23 corresponding to the second limit tooth 2522 and the third limit tooth 2523, and further, the first locking piece 311 is not in contact with the phase-shifting rack 40 located in the sliding slot 23, so that the second limit tooth 2522 and the third limit tooth 2523 do not interfere with the engagement between the phase-shifting rack 40 and the phase-shifting gear 32. That is, the first locking member 311 has an escape gap with the shift rack 40 engaged with the shift gear 32, so that the first locking member 311 does not interfere with the transmission relationship between the shift gear 32 and the shift gear 32.

Therefore, the frequency-selecting locking mechanism 30 can be locked in the first accommodating space 251 and the second accommodating space 252 by the locking piece 31 to be in contact with one limiting tooth 24, so that when the frequency-selecting locking mechanism 30 is meshed with the phase-shifting rack 40 corresponding to the accommodating space 25, the phase-shifting rack 40 can be stably meshed, and the phase-shifting precision is improved.

A transition position is arranged between the adjacent first accommodation space 251 and second accommodation space 252, and the height of the transition position in the vertical direction of the bracket 20 is greater than or equal to the vertical distance between the locking plane 313 of the first locking piece 311 and the locking plane 313 of the second locking piece 312, so that the connected first locking piece 311 and second locking piece 312 can enter the first accommodation space 251 or second accommodation space 252 through the transition position and are locked with the first locking piece 311 of the first accommodation space 251 or the first locking piece 311 of the second accommodation space 252. The transition position is set so that the frequency-selective locking mechanism 30 can be easily moved from the first accommodating space 251 to the second accommodating space 252, or the frequency-selective locking mechanism 30 can be easily moved from the second accommodating space 252 to the first accommodating 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; the bracket 20 is also provided with a stabilizing tooth 26 corresponding to the rib 231 of the sliding chute 23, and the stabilizing tooth 26 extends to the top of the rib 231 towards the opposite direction of the upper frame plate 21 or the lower frame plate 22. The ribs 231 of the two rows of sliding grooves 23 on the support 20 are correspondingly provided with the stabilizing teeth 26, the structure of each stabilizing tooth 26 is the same, the orientation of the stabilizing teeth 26 in different rows is opposite, and the distance between any two adjacent stabilizing teeth 26 in the same row is equal. Specifically, the arrangement structure of the two rows of stabilizing teeth 26 can be referred to the arrangement structure of the two rows of limiting teeth 24, which is not described herein for brevity.

A stabilizing space 27 may be formed between one stabilizing tooth 26 of one row and two adjacent stabilizing teeth 26 of the other row which are adjacent to the other row in projection on the front surface of the lower shelf 22. The stabilizing space 27 is a space formed by three stabilizing teeth 26, and the projections of the three stabilizing teeth 26 on the front surface of the lower frame plate 22 are adjacent to each other, and the projection of the stabilizing tooth 26 at the middle position (the stabilizing tooth is called a first stabilizing tooth 261) overlaps with the projection of the other two stabilizing teeth 26 (the two stabilizing teeth are called a second stabilizing tooth 262 and a third stabilizing tooth 263, respectively). Reflecting to the stabilizing space, the first stabilizing tooth 261 is not located on the same row as the second stabilizing tooth 262 and the third stabilizing tooth 263, each stabilizing space 27 corresponds to one phase shifting rack 40, and the phase shifting rack 40 is located in the sliding slot 23 formed by the two ribs 231 corresponding to the second stabilizing tooth 262 and the third stabilizing tooth 263 which are located on the same row.

The stabilizing space 27 can be divided into a first stabilizing space 271 and a second stabilizing space 272, the first stabilizing tooth 2711 of the first stabilizing space 271 is located on the upper frame plate 21, and the second stabilizing tooth 2712 and the third stabilizing tooth 2713 of the first stabilizing space 271 are located on the lower frame plate 22; first stabilizing tooth 2721 of second stabilizing space 272 resides on lower frame plate 22, and second stabilizing tooth 2722 and third stabilizing tooth 2723 of second stabilizing space 272 reside on upper frame plate 21. The relationship between the first stabilizing space 271 and the second stabilizing space 272 can refer to the relationship between the first accommodating space 251 and the second accommodating space 252, which is not repeated herein for brevity.

The frequency-selecting locking mechanism 30 is provided with a balance piece 34 corresponding to the stabilizing tooth 26. Referring to fig. 2, after the frequency-selective locking mechanism 30 enters a stable space 27, the balance member 34 can cooperate with the three stable teeth 26 of the stable space 27, so that the frequency-selective locking mechanism 30 can stably move along the longitudinal direction of the bracket 20 without jumping or shaking, and the like, thereby affecting the transmission of the phase-shifting gear 32 and the phase-shifting rack 40, and further the phase-shifting performance of the phase-shifting part connected with the phase-shifting rack 40.

In particular, the stabilizing tooth 26 is provided with a stabilizing plane 264, the balancing member 34 is provided with a balancing plane 343 corresponding to the stabilizing plane 264, and the stabilizing plane 264 is arranged in parallel with the balancing plane 343. After the frequency-selective locking mechanism 30 enters the stable space 27, the balance plane 343 of the balance 34 of the frequency-selective locking mechanism 30 faces the stable plane 264 of the first stable tooth 261 of the stable space 27, and the balance plane 343 is in clearance fit with the stable plane 264 of the first stable tooth 261 to prevent the frequency-selective locking mechanism 30 from shaking. In one embodiment, the balance member is in the form of a boss protruding from the rib 231.

In some embodiments, when the stabilizing space 27 is located at the end of the bracket 20 in the longitudinal direction, the stabilizing space 27 may further be composed of the first stabilizing tooth 261 and the second stabilizing tooth 262, and the rib 231 of the slide groove 23 corresponding to the second stabilizing tooth 262, which is not provided with the stabilizing tooth 26.

The frequency-selective locking mechanism 30 has two balance pieces 34, the two balance pieces 34 are connected, and the two balance pieces 34 are symmetrical about a central axis of the bracket 20 in the longitudinal direction. The two balance members 34 are respectively facing the reverse side of the upper shelf 21 and the obverse side of the lower shelf 22, the balance member 34 facing the reverse side of the upper shelf 21 is referred to as a first balance member 341, and the balance member 34 facing the obverse side of the lower shelf 22 is referred to as a second balance member 342.

When the frequency selective locking mechanism 30 enters the first stabilizing space 271, the plane 343 of the first balance member 341 faces the plane 264 of the first stabilizing tooth 2711 of the first stabilizing space 271, but the first balance member 341 is in clearance fit with the first stabilizing tooth 2711, the projection of the first balance member 341 on the front surface of the lower rack 20 coincides with the projection of the first stabilizing tooth 2711 on the front surface of the lower rack 20, and the plane 343 of the second balance member 342 faces between the plane 264 of the second stabilizing tooth 2712 and the plane 264 of the third stabilizing tooth 2713, but is in clearance fit.

When the frequency-selecting locking mechanism 30 enters the second stable space 272, the relationship between the second balance piece 342 and the first stabilizing tooth 2721 of the second stable space 272 can be referred to the relationship between the first balance piece 341 and the first stabilizing tooth 2711 when the frequency-selecting locking mechanism 30 enters the first stable space 271; the relationship between the first balance member 341 and the second stabilizing tooth 2722 and the third stabilizing tooth 2723 of the second stabilizing space 272 can be referred to the relationship between the second balance member 342 and the second stabilizing tooth 2712 and the third stabilizing tooth 2713 when the frequency-selecting locking mechanism 30 enters the first stabilizing space 271, and the details thereof are not repeated.

The stabilizing flats 264 of the stabilizing teeth 26 in the same row are coplanar, whereby the stabilizing flats 264 of a plurality of stabilizing teeth 26 in the same row form a sliding surface and the sliding surfaces of the two rows of stabilizing teeth form an escape channel 28. The connected first balance member 341 and the second balance member 342 can pass through the avoidance channel 28, and the avoidance channel 28 can restrict and limit the first balance member 341 and the second balance member 342 at the same time, and can play a guiding role in guiding the operation of the frequency-selecting locking mechanism 30. Preferably, the bypass channel 28 is substantially rectangular in shape to facilitate the passage of a regularly shaped frequency selective locking mechanism 30 therethrough.

The first accommodating space 251 corresponds to the first stable space 271 of the two ribs 231 residing in the same sliding slot 23, and when the phase shift gear 32 of the frequency-selecting locking mechanism 30 is engaged with the phase shift rack 40 in the sliding slot 23, the frequency-selecting locking mechanism 30 enters the corresponding first accommodating space 251 and the first stable space 271 at the same time; the second accommodating space 252 corresponds to the second stable space 272 of the two ribs 231 residing in the same sliding slot 23, and when the phase shift gear 32 of the frequency-selecting locking mechanism 30 is engaged with the phase shift rack 40 in the sliding slot 23, the frequency-selecting locking mechanism 30 enters the corresponding second accommodating space 252 and the second stable space 272 at the same time.

The two locking members 31 and the two balancing members 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 stabilizing teeth 26 of the bracket 20 can be replaced with the limiting teeth 24, so that the limiting teeth 24 can be disposed on both ends of the bracket 20 in the longitudinal direction to further limit the frequency-selective locking mechanism 30.

In one embodiment, the limiting teeth 24 can be disposed at the middle of the bracket 20 along the longitudinal direction of the phase 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 the phase shift rack 40 corresponding to the limiting teeth 24 disposed at the middle of the bracket 20.

Referring to fig. 3 and 4, the frequency-selective locking mechanism 30 includes a box 37. The lock piece 31 and the balance piece 34 are respectively arranged at two ends of the box body 37 along the longitudinal direction of the phase shift rack 40, the phase shift gear 32 is arranged in the box body 37, the box body 37 is provided with two openings 33 corresponding to the external teeth of the phase shift gear 32, and the two openings 33 are respectively arranged on the back surface of the upper frame plate 21 and the front surface of the lower frame plate 22, so that the phase shift gear 32 can expose the external teeth thereof through the openings 33 to be meshed with any one phase shift rack 40 arranged on the upper frame plate 21, or the phase shift gear 32 can be meshed with any one phase shift rack 40 arranged on the lower frame plate 22 through the external teeth thereof.

The box 37 further includes a position selecting gear 35 disposed therein, the position selecting gear 35 is engaged with the phase shifting gear 32, and the position selecting gear 35 can drive the box 37 to move linearly along the longitudinal direction of the bracket 20, so that the phase shifting gear 32 can be engaged with any one of the phase shifting racks 40 on the upper frame plate 21 or the lower frame plate 22 respectively.

The phase-shifting frequency-selecting device 10 further comprises a transmission shaft and a transmission screw. The gear hole of the position selecting gear 35 is a threaded hole, the position 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 the position selecting gear 35 to move linearly, and the position selecting gear 35 further drives the frequency selecting locking mechanism 30 to move linearly.

The phase-shifting gear 32 is sleeved on the transmission shaft through a gear hole of the phase-shifting gear. When the position selecting gear 35 drives the box body 37 to move, so that the phase shifting gear 32 is meshed with any one phase shifting rack 40, the transmission screw and the transmission shaft are driven simultaneously, the phase shifting gear 32 and the position selecting gear 35 only rotate circumferentially, the phase shifting gear 32 rotates circumferentially, the phase shifting rack 40 is driven to move linearly, and the phase shifting rack 40 drives a phase shifting part connected with the phase shifting rack to perform phase shifting. Preferably, the gear hole of the phase-shifting 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 the bracket 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, the box body 37 has a linkage hole 36, the linkage piece is a linkage shaft, and the linkage shaft passes through the linkage hole 36 of the box body 37 of the multiple frequency-selecting locking mechanisms 30 to link the multiple frequency-selecting locking 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 shift racks 40, the other frequency-selective locking mechanism 30 is not engaged with any of the phase shift racks 40. Alternatively, when one of the frequency selective locking mechanisms 30 is engaged with one of the phase shift racks 40, the other frequency selective 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 fixing component 41. The phase shift rack 40 is fixedly clamped by an elastic buckle 411 in the fixing part 41, so that the phase shift rack 40 cannot move freely when not engaged with the phase shift gear 32. The frequency-selecting locking mechanism 30 is provided with a jacking member, when the phase-shifting gear 32 is in aligned engagement with the phase-shifting rack 40, the jacking member can jack up the fixing part 41, and the elastic buckle 411 of the fixing part 41 releases the phase-shifting rack 40, so that the phase-shifting rack 40 is in a movable state.

In one embodiment, a connecting section 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-shifting rack 40, so as to restrict the phase-shifting rack 40 from moving linearly only along the longitudinal direction thereof, but not toward the vertical direction of the bracket 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 shifting component is respectively connected with one phase shifting rack of the phase shifting frequency selection device, and the phase shifting rack drives the phase shifting component to move by controlling the motion of the phase shifting rack so as to implement phase shifting.

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

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 bracket at the opposite position of the meshed phase-shifting racks;

the bracket is arranged 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.

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

3. The phase shifting frequency selecting device according to claim 1, wherein the lock member and the limit tooth are located at an end of the holder, which is located at an end of the phase shifting rack pointed in a longitudinal direction thereof.

4. A phase shifting frequency selecting device according to claim 3, wherein said frequency selecting locking mechanism further comprises a balance member, said balance member being disposed at the other end opposite to the end at which said locking member is disposed, and sliding on an avoidance groove formed at the other end of said bracket when linearly operated with the frequency selecting locking mechanism.

5. The phase shifting frequency-selective device according to claim 4, 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.

6. The phase shifting frequency selecting device according to claim 1, wherein the locking member is in a shape of a boss, and the limiting teeth are in a shape of a boss corresponding to the locking member.

7. The phase shifting frequency-selective device according to claim 6, 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.

8. A phase shifting frequency-selective device according to claim 3, wherein said frequency-selective locking mechanism has two locking members, said two locking members being symmetrically disposed and fixedly connected.

9. 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.

10. The phase shifting frequency-selecting device according to claim 4, 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.

11. The phase shifting frequency-selective device according to claim 10, wherein the slide groove is provided with stabilizing teeth at the other end of the slide groove away from the limit teeth in the longitudinal direction thereof, the stabilizing teeth are provided on the ribs, and the outer side surfaces of all the stabilizing teeth of the same row of slide grooves are located on the same plane for defining one side of the avoiding channel.

12. The phase shifting frequency-selective device according to claim 11, wherein when the 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 frictional contact under the constraint that the balance member of the frequency-selective locking mechanism is in fit and positioning with the stabilizing tooth.

13. The phase shifting frequency-selective device according to claim 4, wherein the frequency-selective locking mechanism comprises a box body, the phase shifting gear is disposed 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 is exposed to the outside through the two openings so as to be meshed with the phase shifting racks.

14. The phase shifting frequency-selective device according to claim 9, wherein the two frequency-selective locking mechanisms are connected by a linkage so that the two frequency-selective locking mechanisms perform linear motion in synchronization.

15. The phase shifting frequency selecting device according to claim 1, wherein each of the phase shifting racks is used to link phase shifting parts of the antennas of one frequency band.

16. The phase shifting frequency selecting device according to any one of claims 1 to 15, 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.

17. 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 16, 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.