Phase-shift control device and multi-frequency antenna

Abstract

This invention provides a phase-shifting control device and a multi-frequency antenna. The phase-shifting control device includes multiple phase-shifting racks and a phase-shifting assembly. The phase-shifting assembly includes a phase-shifting mechanism, a drive shaft, and a frequency-selective shaft. The drive shaft and the frequency-selective shaft are parallel. The phase-shifting mechanism has a sliding member inserted into the frequency-selective shaft. Driving the frequency-selective shaft to rotate causes the sliding member to move linearly along the frequency-selective shaft. This allows a phase-shifting gear, located within the phase-shifting mechanism and mounted on the drive shaft, to engage or disengage with any one of the phase-shifting racks. This drives the drive shaft to rotate, causing the phase-shifting rack engaged with the phase-shifting gear to move, thus implementing phase shifting. The device has a short transmission chain, which facilitates torque transmission, improves rotational efficiency, and reduces transmission errors. Furthermore, the device has a simple structure and a simple spatial arrangement, facilitating flattening. When this device is used in a multi-frequency antenna, it facilitates the miniaturization and weight reduction of the multi-frequency antenna.

Description

Technical Field

[0001] This invention belongs to the field of mobile communication technology, specifically relating to a phase shift control device and a multi-frequency antenna configured with the phase shift control device. Background Technology

[0002] With the continuous increase in the number of mobile communication terminal users and the popularization of 5G, the demand for network capacity in mobile cellular networks is increasing. At the same time, it is necessary to minimize interference between different sites and even between different sectors of the same site, that is, to maximize network capacity and minimize interference. To achieve this goal, the antenna beam downtilt angle at the site is usually adjusted.

[0003] When the antenna is a multi-band antenna, the beam downtilt angle is mainly adjusted by machine downtilt. Specifically, the antenna typically has a built-in transmission device. This device connects to the corresponding phase-shifting components for each frequency band in the multi-band antenna via multiple phase-shifting elements. The transmission device selects one of the phase-shifting elements through a frequency selection mechanism, which then drives the phase-shifting element to perform the phase-shifting operation. However, traditional transmission devices are complex in structure, require multiple transfers, have low frequency selection and phase-shifting output efficiency, poor reliability, and are large in size with insufficient flatness, resulting in a large antenna size. Furthermore, the high production cost of the transmission device hinders its large-scale application. Summary of the Invention

[0004] The purpose of this invention is to solve at least one of the above-mentioned problems by providing a phase-shifting control device and a multi-frequency antenna.

[0005] To meet the various objectives of this invention, the following technical solutions are adopted:

[0006] One objective of this invention is to provide a phase-shifting control device, comprising multiple phase-shifting racks and a phase-shifting assembly. The phase-shifting assembly includes a phase-shifting mechanism, a drive shaft, and a frequency-selective shaft. The drive shaft and the frequency-selective shaft are parallel. The phase-shifting mechanism is provided with a sliding member inserted into the frequency-selective shaft. Driving the frequency-selective shaft to rotate causes the sliding member to move linearly along the frequency-selective shaft, such that a phase-shifting gear disposed within the phase-shifting mechanism and sleeved on the drive shaft engages or disengages with any one of the phase-shifting racks. Driving the drive shaft to rotate causes the phase-shifting rack meshing with the phase-shifting gear to move, thereby implementing phase shifting.

[0007] Furthermore, the sliding member is inserted into an annular groove on the outer wall of the frequency selection shaft. The annular groove includes a first spiral groove and a second spiral groove. The first spiral groove extends spirally from the first end to the second end of the frequency selection shaft, and the second spiral groove extends spirally from the second end to the first end of the frequency selection shaft. The first spiral groove and the second spiral groove are connected end to end.

[0008] Specifically, the sliding end of the slider is inserted into the annular groove, and a cam is provided on the sliding end.

[0009] Specifically, the outer wall of the frequency selection shaft is provided with a plurality of protrusions, which are arranged sequentially along the extension direction of the annular groove, and the plurality of protrusions together constitute the groove wall of the annular groove.

[0010] Furthermore, the plurality of phase-shifting racks constitute two rows of phase-shifting racks, which are respectively arranged on the upper and lower sides of the frequency selection shaft. The phase-shifting mechanism has two openings corresponding to the two rows of phase-shifting racks. Part of the external teeth of the phase-shifting gear are exposed to the outside through the two openings so as to mesh with any one of the phase-shifting racks in any row.

[0011] Furthermore, the first end of the frequency selection shaft is inserted into the first one-way bearing, which is disposed in the first transmission component. The first end of the transmission shaft is inserted into the second one-way bearing, which is disposed in the second transmission component. The first one-way bearing and the second one-way bearing rotate in opposite directions, and the first transmission component and the second transmission component receive the torque output by the same drive mechanism.

[0012] Specifically, the first transmission component is a first bevel gear, the second transmission component is a second bevel gear, and the driving mechanism includes a drive shaft and a third bevel gear and a fourth bevel gear sleeved on the drive shaft. The third bevel gear meshes with the first bevel gear, and the fourth bevel gear meshes with the second bevel gear.

[0013] Specifically, the phase-shifting gear includes a first phase-shifting gear and a second phase-shifting gear. The first phase-shifting gear is sleeved on the transmission shaft, and the second phase-shifting gear is sleeved on an auxiliary shaft parallel to the transmission shaft. The first phase-shifting gear and the second phase-shifting gear mesh with each other.

[0014] In another embodiment, the frequency selection shaft is connected to the first drive mechanism, and the transmission shaft is connected to the second drive mechanism, with the first drive mechanism and the second drive mechanism receiving torques from different sources.

[0015] To meet one of the objectives of this invention, a multi-frequency antenna is provided, comprising multiple phase-shifting components corresponding to multiple frequency bands, including a phase-shifting control device as described in any of the preceding objectives, wherein each of the phase-shifting components has a corresponding phase-shifting rack in the phase-shifting control device and is linked thereto.

[0016] Compared with existing technologies, the present invention has many advantages, including but not limited to:

[0017] On the one hand, the phase-shifting control device of the present invention drives the frequency selection shaft to rotate, causing the slider to move linearly along the frequency selection shaft, so that the slider drives the phase-shifting gear to mesh with any one of the phase-shifting racks, and drives the phase-shifting gear to rotate by rotating the transmission shaft, so that the phase-shifting gear drives the phase-shifting rack to rotate. Thus, the transmission chain of the phase-shifting control device is shorter, which facilitates the transmission of torque, improves rotation efficiency, and reduces transmission error.

[0018] On the other hand, the phase-shifting control device of the present invention has a simple structure and a relatively simple spatial arrangement, which facilitates the flattening of the phase-shifting control device and makes it easier to miniaturize and lighten the multi-frequency antenna when the phase-shifting control device is set inside the multi-frequency antenna.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of the invention. Attached Figure Description

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0021] Figure 1 This is a schematic diagram of the phase-shifting control device according to a typical embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of the frequency selection shaft of the phase-shifting control device according to a typical embodiment of the present invention.

[0023] Figure 3 This is a schematic diagram of the annular groove of the phase-shifting control device according to a typical embodiment of the present invention.

[0024] Figure 4 This is a schematic diagram of the structure of the sliding component of the phase-shifting control device according to a typical embodiment of the present invention.

[0025] Figure 5 This is a top view schematic diagram of a phase-shifting control device according to a typical embodiment of the present invention.

[0026] Figure 6 for Figure 5 Enlarged view of part A. Detailed Implementation

[0027] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as limiting the present invention.

[0028] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, and / or components, nor does it exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connections or wireless coupling. The term “and / or” as used herein includes all or any units and all combinations of one or more associated listed items.

[0029] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0030] The present invention provides a phase shift control device. The phase shift mechanism of the phase shift control device drives the frequency selection shaft to rotate, so that the sliding member moves along the annular groove on the frequency selection shaft. The phase shift gear in the phase shift mechanism meshes with any one of the phase shift racks, and the frequency selection shaft and the transmission shaft are driven independently without affecting each other, thereby improving transmission efficiency and reducing the size of the phase shift control device, which is conducive to the miniaturization of the antenna.

[0031] In a typical embodiment of the present invention, combined with Figure 1 The phase-shifting control device 100 includes a plurality of phase-shifting racks 110 and a phase-shifting assembly. The phase-shifting assembly includes a phase-shifting mechanism 130, a drive shaft 121 and a frequency-selective shaft 122. The drive shaft 121 and the frequency-selective shaft 122 are arranged parallel to each other.

[0032] The phase-shifting rack 110 is connected to the phase-shifting component of the antenna. The linear movement of the phase-shifting rack 110 pulls the phase-shifting component to move, so that the phase-shifting component shifts the phase of the signal fed into it. The plurality of phase-shifting racks 110 are connected to the plurality of phase-shifting components respectively.

[0033] The plurality of phase-shifting racks 110 are arranged along the axial direction of the transmission shaft 121. These racks are divided into two rows, located on the upper and lower sides of the transmission shaft 121 respectively. The two rows of racks are parallel to each other and are staggered and facing each other. Figure 1 The image shows a row of phase-shifting racks positioned below the drive shaft 121.

[0034] Combination Figure 2 and Figure 3 The outer wall 1221 of the frequency selection shaft 122 is provided with an annular groove 1222, which includes a first spiral groove 1223 and a second spiral groove 1224. The first spiral groove 1223 extends spirally from the first end 1225 of the frequency selection shaft 122 to the second end 1226, and the second spiral groove 1224 extends spirally from the second end 1226 to the first end 1225. The first end of the first spiral groove 1223 is connected to the tail end of the second spiral groove 1224, and the tail end of the first spiral groove 1223 is connected to the first end of the second spiral groove 1224. That is to say, the first spiral groove 1223 and the second spiral groove 1224 are connected end to end.

[0035] Specifically, the outer wall 1221 of the frequency selection shaft 122 is provided with a plurality of protrusions 1227. The plurality of protrusions 1227 are arranged sequentially along the extending direction of the annular groove 1222, and the plurality of protrusions 1227 together constitute the groove wall of the annular groove 1222. In this embodiment, the protrusions 1227 are crescent-shaped. The plurality of protrusions 1227 are divided into two rows, which are respectively disposed on both sides of the central axis of the frequency selection shaft 122. The two rows of protrusions are parallel to each other, and the two rows of protrusions are staggered and facing each other.

[0036] The phase-shifting mechanism 130 includes a linkage box 131, a sliding member 132, and a phase-shifting gear 133 disposed in the linkage box 131. The linkage box 131 has two openings 1311 corresponding to the two rows of phase-shifting racks. Part of the external teeth of the phase-shifting gear 133 are exposed to the outside through the two openings 1311, so that the phase-shifting gear 133 can mesh with any one of the two rows of phase-shifting racks 110. The drive shaft 121 passes through the gear hole of the phase-shifting gear 133, so that the drive shaft 121 can drive the phase-shifting gear 133 to rotate.

[0037] Combination Figure 1 and Figure 4The sliding member 132 is disposed on the linkage box 131. The sliding member 132 includes a fixed end 1321 and a sliding end 1322. The fixed end 1321 is disposed on the linkage box 131, and the sliding end 1322 is inserted into the annular groove 1222 of the frequency selection shaft 122. In this embodiment, a cam 1323 is provided on the sliding end 1322, and the cam 1323 is disposed in the annular groove 1222. The shape of the cam 1323 corresponds to the shape of the cross-section of the annular groove 1222, so that the cam 1323 can slide along the annular groove 1222.

[0038] Specifically, in combination Figure 5 and Figure 6 Rotating the frequency selection shaft 122 causes the cam 1323 to move along the extension path of the annular groove 1222, forming a screw-nut mechanism between the cam 1323 and the annular groove 1222. Rotating the frequency selection shaft 122 causes the cam 1323 to slide along the annular groove 1222, driving the linkage box 131 to move via the sliding member 132. The linkage box 131 drives the phase-shifting gear 133 disposed therein to move, allowing the phase-shifting gear 133 to engage or disengage with any one of the phase-shifting racks 110. When the phase-shifting gear 133 engages with one of the phase-shifting racks 110, rotating the transmission shaft 121 causes the phase-shifting gear 133 to rotate electrically via the transmission shaft 121, thereby driving the phase-shifting rack 110 to move to perform phase shifting.

[0039] Specifically, in combination Figure 2 and Figure 3 Since the annular groove 1222 is composed of a first spiral groove 1223 and a second spiral groove 1224, the rotation path of the frequency selection shaft 122 corresponds to the extension path of the first spiral groove 1223 and the second spiral groove 1224. Rotating the frequency selection shaft 122 allows the cam 1323 to reciprocate along the annular groove 1222 formed by the first spiral groove 1223 and the second spiral groove 1224.

[0040] In a typical embodiment of the present invention, combined with Figure 1 The phase shifting assembly further includes a first one-way bearing 141, a first transmission component, a second one-way bearing 142, and a second transmission component. The first end 1225 of the frequency selection shaft 122 is inserted into the first one-way bearing 141, which is disposed in the first transmission component. The first end of the transmission shaft 121 is inserted into the second one-way bearing 142, which is disposed in the second transmission component. The first one-way bearing 141 and the second one-way bearing 142 rotate in opposite directions.

[0041] In this embodiment, the first transmission component is a first bevel gear 143, and the second transmission component is a second bevel gear 144.

[0042] The phase-shifting control device 100 further includes a drive mechanism, which simultaneously outputs torque in a first direction or a second direction to the first bevel gear 143 and the second bevel gear 144. The first one-way bearing 141 rotates when subjected to torque in the first direction and locks when subjected to torque in the second direction; the second one-way bearing 142 locks when subjected to torque in the first direction and rotates when subjected to torque in the second direction. In this embodiment, the first direction is clockwise and the second direction is counterclockwise. Alternatively, the first direction is counterclockwise and the second direction is clockwise.

[0043] When the drive mechanism simultaneously outputs a torque in the first direction to both the first bevel gear 143 and the second bevel gear 144, the frequency selection shaft 122 rotates under the action of the first one-way bearing 141; under the action of the second one-way bearing 142, the transmission shaft 121 does not rotate. When the frequency selection shaft 122 rotates under the torque in the first direction, the sliding member 132 inserted in the annular groove 1222 of the frequency selection shaft 122 slides along the annular groove 1222 as the frequency selection shaft 122 rotates. Since the annular groove 1222 is formed by the first helical groove 1223 and the second helical groove 1224 being connected end to end, the sliding member 132 slides from the first helical groove 1223 to the second helical groove 1224 or from the second helical groove 1224 to the first helical groove 1223, causing the sliding member 132 to circulate along the annular groove 1222.

[0044] For example, when the slider 132 slides from the beginning of the first spiral groove 1223 to the end of the first spiral groove 1223, since the end of the first spiral groove 1223 is connected to the beginning of the second spiral groove 1224, when the slider 132 slides to the beginning of the second spiral groove 1224, the slider 132 then slides to the end of the second spiral groove 1224, and the end of the second spiral groove 1224 is connected to the beginning of the first spiral groove 1223. Thus, when the frequency selection shaft 122 is subjected to a torque in the first direction, the slider 132 moves cyclically along the annular groove 1222.

[0045] The sliding member 132 is mounted on the linkage box 131. When the frequency selection shaft 122 drives the sliding member 132 to move, the sliding member 132 drives the linkage box 131 to move synchronously. The linkage box 131 then drives the phase-shifting gear 133 mounted therein to move synchronously, causing the phase-shifting gear 133 to reciprocate along the central axis of the frequency selection shaft 122. For example, driven by the sliding member 132, the phase-shifting gear 133 moves from the first end 1225 of the frequency selection shaft 122 to the second end 1226 of the frequency selection shaft 122. When it reaches the second end 1226 of the frequency selection shaft 122, the phase-shifting gear 133 moves from the second end 1226 back to the first end 1225 of the frequency selection shaft 122. This causes the phase-shifting gear 133 to reciprocate along the axial direction of the frequency selection shaft 122, allowing the phase-shifting gear 133 to mesh with any one of the two rows of phase-shifting racks 110.

[0046] When the phase-shifting gear 133 meshes with the corresponding phase-shifting rack 110, the drive mechanism stops outputting torque in the first direction and switches to outputting torque in the second direction. Under the action of the first one-way bearing 141, the frequency selection shaft 122 does not rotate; under the action of the second one-way bearing 142, the transmission shaft 121 rotates, the transmission shaft 121 drives the phase-shifting gear 133 to rotate, the phase-shifting gear 133 drives the phase-shifting rack 110 meshing with it to rotate, and the phase-shifting rack 110 drives the connected phase-shifting component to move, so as to implement phase shifting.

[0047] In this embodiment, the phase-shifting gears include a first phase-shifting gear 1331 and a second phase-shifting gear 1332. The transmission shaft 121 passes through the gear hole of the first phase-shifting gear 1331. An auxiliary shaft 149 is provided corresponding to the second phase-shifting gear 1332, and the auxiliary shaft 149 is arranged parallel to the transmission shaft 121, passing through the gear hole of the second phase-shifting gear 1332. The first phase-shifting gear 1331 and the second phase-shifting gear 1332 mesh. When the transmission shaft 121 drives the first phase-shifting gear 1331 to rotate, the first phase-shifting gear 1331 also drives the second phase-shifting gear 1332, and the first phase-shifting gear 1331 and the second phase-shifting gear 1332 rotate in opposite directions.

[0048] The phase-shifting rack 110 moves in either a third or fourth direction, with the third direction being opposite to the fourth direction. Since the drive shaft 121 is constrained to rotate in the first direction, it drives the first phase-shifting gear 1331 to rotate in the first direction, so that the first phase-shifting gear 1331 can only drive the phase-shifting rack 110 (referred to as the first phase-shifting rack 110) it meshes with to move in the third direction. When it is necessary to drive the phase-shifting rack 110 to move in the fourth direction, the frequency selection shaft 122 drives the second phase-shifting gear 1332 to mesh with the first phase-shifting rack 110. Then, by driving the drive shaft 121, the drive shaft 121 drives the second phase-shifting gear 1332 to rotate in the second direction via the first phase-shifting gear 1331. The second phase-shifting gear 1332 then drives the first phase-shifting rack 110 to move in the fourth direction, thus achieving the reversal of the first phase-shifting rack 110.

[0049] The drive mechanism includes a drive shaft 145, a third bevel gear 146, and a fourth bevel gear 147. The drive shaft 145 passes sequentially through the gear holes of the third bevel gear 146 and the fourth bevel gear 147. The third bevel gear 146 meshes with the first bevel gear 143, and the fourth bevel gear 147 meshes with the second bevel gear 144. By driving the drive shaft 145, a force is applied in a first or second direction to rotate the frequency selection shaft 122 or the transmission shaft 121. In one embodiment, the drive mechanism further includes a motor 148, the output shaft of which is connected to one end of the drive shaft 145.

[0050] In another embodiment, the phase-shifting assembly does not include components such as the first one-way bearing 141, the first transmission component, the second one-way bearing 142, the second transmission component, the second phase-shifting gear 1332, and the auxiliary shaft 149. The transmission mechanism includes a first drive mechanism and a second drive mechanism. The first drive mechanism includes a first motor (not shown), and the second drive mechanism includes a second motor (not shown).

[0051] The output shaft of the first motor is connected to the frequency selection shaft 122, and the output shaft of the second motor is connected to the transmission shaft 121. The first motor drives the frequency selection shaft 122 to rotate in a first or second direction, causing the sliding member 132 to rotate along the annular groove 1222, so that the phase-shifting gear 133 in the linkage box 131 meshes with any one of the phase-shifting racks 110. The second motor drives the transmission shaft 121 to rotate, causing the transmission shaft 121 to drive the phase-shifting gear 133 to rotate in the first or second direction. The phase-shifting gear 133 drives the meshing phase-shifting rack 110 to move, and the phase-shifting rack 110 drives the phase-shifting component to move, thereby implementing phase shifting.

[0052] In one embodiment, the phase-shifting control device 100 further includes a bracket 150, on which the drive shaft 121 and the frequency selection shaft 122 are mounted, and the two rows of phase-shifting racks are also mounted on the bracket 150.

[0053] The present invention also provides a multi-frequency antenna, which includes multiple phase-shifting components corresponding to multiple frequency bands and the phase-shifting control device described above. Each phase-shifting component is connected to a phase-shifting rack of the phase-shifting control device. By controlling the movement of the phase-shifting rack, the phase-shifting rack drives the phase-shifting component to move, thereby implementing phase shifting.

[0054] In summary, the phase-shifting control device of the present invention drives the frequency-selective shaft to rotate, thereby moving a sliding member inserted in the annular groove of the frequency-selective shaft. The sliding member drives the phase-shifting mechanism to move, so that the phase-shifting gear set in the phase-shifting mechanism meshes with any one of the phase-shifting racks. The phase-shifting rack is rotated by the phase-shifting gear through the drive shaft, thereby implementing phase shifting. The transmission method of the phase-shifting control device is simple, and the frequency-selective shaft and the drive shaft can be driven by the same torque, reducing the number of parts. The phase-shifting control device has a simple structure, small size and flatness, which makes it easy to install on a multi-frequency antenna, thus miniaturizing the multi-frequency antenna.

[0055] The above description is merely a preferred embodiment of the present invention and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention is not limited to the specific combination of the above-described technical features, but also includes other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions as those in the present invention.

[0056] Although the subject matter has been described using language specific to structural features and / or methodological logic, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. Rather, the specific features and actions described above are merely illustrative examples of implementing the claims.

Claims

1. A phase-shifting control device, characterized in that, The device includes multiple phase-shifting racks and a phase-shifting assembly. The phase-shifting assembly includes a phase-shifting mechanism, a drive shaft, and a frequency-selective shaft. The drive shaft and the frequency-selective shaft are parallel. The phase-shifting mechanism is provided with a sliding member inserted into the frequency-selective shaft. Driving the frequency-selective shaft to rotate causes the sliding member to move linearly along the frequency-selective shaft, so that the phase-shifting gear, which is set in the phase-shifting mechanism and sleeved on the drive shaft, meshes or disengages with any one of the phase-shifting racks. Driving the drive shaft to rotate causes the phase-shifting rack meshing with the phase-shifting gear to move, thereby implementing phase shifting. The sliding member is inserted into the annular groove on the outer wall of the frequency selection shaft. The annular groove includes a first spiral groove and a second spiral groove. The first spiral groove extends spirally from the first end to the second end of the frequency selection shaft, and the second spiral groove extends spirally from the second end to the first end of the frequency selection shaft. The first spiral groove and the second spiral groove are connected end to end.

2. The phase-shifting control device as described in claim 1, characterized in that, The sliding end of the slider is inserted into the annular groove, and a cam is provided on the sliding end.

3. The phase-shifting control device as described in claim 1, characterized in that, The outer wall of the frequency selection shaft is provided with a plurality of protrusions, which are arranged sequentially along the extension direction of the annular groove, and the plurality of protrusions together constitute the groove wall of the annular groove.

4. The phase-shifting control device as described in claim 1, characterized in that, The plurality of phase-shifting racks form two rows of phase-shifting racks, which are respectively arranged on the upper and lower sides of the frequency selection shaft. The phase-shifting mechanism has two openings corresponding to the two rows of phase-shifting racks. Part of the external teeth of the phase-shifting gear are exposed to the outside through the two openings so as to mesh with any one of the phase-shifting racks in any row.

5. The phase-shifting control device according to any one of claims 1 to 4, characterized in that, The first end of the frequency selection shaft is inserted into the first one-way bearing, which is disposed in the first transmission component. The first end of the transmission shaft is inserted into the second one-way bearing, which is disposed in the second transmission component. The first one-way bearing and the second one-way bearing rotate in opposite directions, and the first transmission component and the second transmission component receive the torque output by the same drive mechanism.

6. The phase-shifting control device as described in claim 5, characterized in that, The first transmission component is a first bevel gear, the second transmission component is a second bevel gear, and the driving mechanism includes a drive shaft and a third bevel gear and a fourth bevel gear sleeved on the drive shaft. The third bevel gear meshes with the first bevel gear, and the fourth bevel gear meshes with the second bevel gear.

7. The phase-shifting control device as described in claim 5, characterized in that, The phase-shifting gear includes a first phase-shifting gear and a second phase-shifting gear. The first phase-shifting gear is sleeved on the transmission shaft, and the second phase-shifting gear is sleeved on an auxiliary shaft parallel to the transmission shaft. The first phase-shifting gear and the second phase-shifting gear mesh with each other.

8. The phase-shifting control device according to any one of claims 1 to 4, characterized in that, The frequency-selective shaft is connected to the first drive mechanism, and the transmission shaft is connected to the second drive mechanism. The first drive mechanism and the second drive mechanism receive torques from different sources.

9. A multi-frequency antenna, comprising multiple phase-shifting components corresponding to multiple frequency bands, characterized in that, It includes the phase-shifting control device as described in any one of claims 1 to 8, wherein each of the phase-shifting components has a corresponding phase-shifting rack in the phase-shifting control device and is linked to it.

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