CN114361795A - Multi-frequency antenna and frequency-selecting phase-shifting device thereof - Google Patents
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- CN114361795A CN114361795A CN202111646226.5A CN202111646226A CN114361795A CN 114361795 A CN114361795 A CN 114361795A CN 202111646226 A CN202111646226 A CN 202111646226A CN 114361795 A CN114361795 A CN 114361795A
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Abstract
According to the frequency-selecting phase-shifting device provided by the invention, the driving gear is fixedly arranged on the connecting rod assembly on the transmission nut through the phase-shifting mechanism; the transmission screw drives the transmission nut to move linearly so as to drive the driving gear to be aligned and meshed with the phase-shifting gear of any phase-shifting assembly, and the phase-shifting assembly corresponding to the antenna of a certain frequency band is selected. The connecting rod assembly drives the driving gear to rotate so as to drive the phase-shifting gear of the phase-shifting assembly to rotate, so that the phase-shifting assembly is driven to shift the phase, and phase modulation operation is performed on the antenna of the phase-shifting assembly in the corresponding frequency band. Therefore, the purpose of controlling the phase shift of the antenna frequency band signals corresponding to the plurality of phase shift racks is achieved. The invention also provides a multi-frequency antenna comprising the frequency-selecting phase-shifting device.
Description
Technical Field
The invention belongs to the technical field of mobile communication, and particularly relates to a multi-frequency antenna and a frequency-selecting phase-shifting device thereof.
Background
With the increasing number of mobile communication terminal users, the demand for network capacity of stations in a mobile cellular network is increasing, and it is required to minimize interference between different stations, even between different sectors of the same station, that is, to maximize network capacity and minimize interference. This is usually achieved by adjusting the downtilt angle of the antenna beam at the station.
In the two ways of adjusting the beam downtilt angle, namely, mechanical downtilt and electronic downtilt, the advantage of electronic downtilt is obvious, and the method is currently a mainstream and future development trend. The control of the electrical downtilt angle mainly includes two major categories, namely an internal control and an external control, wherein the internal control is the mainstream at present and in the future.
However, the motors used to drive the phase shifters in the conventional transmission device still correspond to the transmission mechanisms of the phase shifters one-to-one, the number of the motors is not reduced, and the number of the driving circuits in the control module is not reduced as the number of the motors. If the frequency bands of the antenna are increased, the structure of the transmission system is more complex and heavy, which affects the reliability of the multi-frequency antenna.
The applicant has practiced the related art solutions to the above problems, but there is still room for improvement in terms of stable control and simple operation, and particularly, in the case of one control, there is still a large room for improvement in the related structure.
Disclosure of Invention
The first purpose of the present invention is to provide a frequency-selecting phase-shifting device with stable control and simple operation.
Another object of the present invention is to provide a multi-frequency antenna.
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention provides a frequency-selecting phase-shifting device, which comprises phase-shifting components corresponding to a plurality of frequency bands arranged side by side, a frequency-selecting mechanism of the phase-shifting component controlled by a driving moment to select one of the frequency bands, and a phase-shifting mechanism controlled by the driving moment to perform phase-shifting control on the selected phase-shifting component, wherein the frequency-selecting mechanism comprises a transmission screw rod and a transmission nut, the transmission screw rod is axially arranged in parallel with the arrangement direction of the phase-shifting components, and the transmission nut is screwed with the transmission screw rod; the phase shifting mechanism comprises a connecting rod assembly arranged on a transmission nut, and a driving gear is fixedly arranged on the connecting rod assembly; the transmission screw drives the transmission nut to move linearly so as to drive the driving gear to be aligned and meshed with the phase shifting gear of any one phase shifting assembly, and the driving gear rotates so as to drive the phase shifting gear to rotate so as to drive the phase shifting assembly to shift the phase.
Furthermore, the phase shifting assembly comprises a phase shifting screw and a phase shifting piece screwed with the phase shifting screw, and the phase shifting gear is fixedly arranged on the phase shifting screw.
Furthermore, link assembly includes along the axial of the screw rod that moves phase sets up a plurality of continuous triangle connecting rods in order, set up in be equipped with the output shaft on the triangle connecting rod of link assembly one end, the driving gear set firmly in on the output shaft.
Furthermore, the sub-rods of two adjacent triangular connecting rods are correspondingly pivoted one by one through the sliding blocks.
Furthermore, an input shaft is arranged on the triangular connecting rod arranged at the other end of the connecting rod assembly, the input shaft is connected with the first motor, and one end of the transmission screw rod is connected with the second motor.
Furthermore, the phase shifting mechanism further comprises a fixed seat, the fixed seat is fixedly connected with the transmission screw rod, and the connecting rod assembly is arranged on the fixed seat.
Furthermore, the frequency-selecting phase-shifting device further comprises a supporting seat, and the supporting seat is used for supporting the phase-shifting screw rod, the frequency-selecting mechanism and the phase-shifting mechanism.
Furthermore, the phase shift gear and the phase shift screw rod are integrally formed.
Furthermore, the frequency-selecting phase-shifting device is provided with two rows of phase-shifting assemblies, the two rows of phase-shifting assemblies are arranged on two sides of the axial direction of the transmission screw rod, and the two rows of phase-shifting assemblies are arranged in a staggered mode.
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 frequency-selecting phase-shifting device, wherein each phase-shifting part is provided with a phase-shifting component corresponding to one frequency-selecting phase-shifting device and is in linkage arrangement with the phase-shifting component
Compared with the prior art, the invention has the following advantages:
according to the frequency-selecting phase-shifting device provided by the invention, the driving gear is fixedly arranged on the connecting rod assembly on the transmission nut through the phase-shifting mechanism; the transmission screw drives the transmission nut to move linearly so as to drive the driving gear to be aligned and meshed with the phase-shifting gear of any phase-shifting assembly, and the phase-shifting assembly corresponding to the antenna of a certain frequency band is selected. The connecting rod assembly drives the driving gear to rotate so as to drive the phase-shifting gear of the phase-shifting assembly to rotate, so that the phase-shifting assembly is driven to shift the phase, and phase modulation operation is performed on the antenna of the phase-shifting assembly in the corresponding frequency band. Therefore, the purpose of controlling the phase shift of the antenna frequency band signals corresponding to the plurality of phase shift racks is achieved.
In addition, the frequency-selecting phase-shifting device has the advantages of simple structure, ingenious and reasonable combination of the frequency-selecting mechanism and the moving mechanism, simple operation and stable phase modulation.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of an internal structure of a frequency-selective phase-shifting apparatus according to the present invention;
FIG. 2 is a schematic view of a connecting rod assembly of the present invention;
FIG. 3 is a schematic view of the middle triangular link structure of the present invention;
FIG. 4 is a schematic view of the end triangular link structure of the present invention.
Detailed Description
Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided for a more thorough and complete understanding of the present invention. It should be understood that the drawings and the embodiments of the present invention are illustrative only and are not intended to limit the scope of the present invention.
The term "include" and variations thereof as used herein are open-ended, i.e., "including but not limited to". The term "coupled" may refer to direct coupling or indirect coupling via intermediate members (elements). The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Relevant definitions for other terms will be given in the following description.
It should be noted that the terms "first", "second", and the like in the present invention are only used for distinguishing the devices, modules or units, and are not used for limiting the devices, modules or units to be different devices, modules or units, and are not used for limiting the sequence or interdependence relationship of the functions executed by the devices, modules or units.
The invention provides a frequency-selecting and phase-shifting device for an antenna, which comprises a plurality of phase-shifting components 1 corresponding to frequency bands, a frequency-selecting mechanism 2 of the phase-shifting component 1, and a phase-shifting mechanism 3, wherein the phase-shifting components 1 are arranged side by side, the frequency-selecting mechanism is controlled by a driving moment to select one of the frequency bands, and the phase-shifting mechanism is controlled by the driving moment to perform phase-shifting control on the selected phase-shifting component 1, as shown in figure 1.
A plurality of phase shift assemblies 1 are arranged side by side. In one embodiment, the phase shift assembly 1 includes a phase shift screw 11 and a phase shift member 12 screwed with the phase shift screw 11, and the phase shift screw 11 and the phase shift member 12 form a screw transmission mechanism. The phase shift gear 10 is fixedly arranged at the end part of the phase shift screw 11. The phase shift element 12 is used to interface with a phase shift element (not shown) of an external phase shifter. The antenna frequency-selecting phase-shifting device provided by the invention is provided with a plurality of phase-shifting components 1 and a plurality of phase-shifting pieces 12 corresponding to the phase-shifting components, wherein the phase-shifting pieces 12 are respectively connected with phase-shifting parts of phase shifters in different external frequency bands.
When the phase shift gear 10 rotates, the phase shift gear 10 drives the phase shift screw 11 to rotate. Because the phase shift element 12 and the phase shift screw 11 form a screw transmission mechanism, when the phase shift screw 11 rotates in the circumferential direction, the phase shift element 12 does not rotate in the circumferential direction in the same direction as the phase shift screw 11, and the phase shift element 12 moves in a straight line corresponding to the direction of the circumferential rotation of the phase shift screw 11 along the axial direction of the phase shift screw 11. The phase shift element 12 further moves the phase shift element of the external phase shifter connected thereto to perform the phase shift operation of the external phase shifter. Therefore, the direction and the displacement of the phase shifter 12 can be controlled by controlling the rotation direction and the number of rotations of the phase shift screw 11, so as to control the displacement of the phase shifter of the corresponding frequency band, thereby achieving the purpose of controlling the phase shift of the phase shifter of the frequency band. The phase shift gear 10 may be integrally formed with the phase shift screw 11, or may be fixedly provided at an end of the phase shift screw 11 as a separate component.
In other embodiments, the phase shift assembly 1 may also be composed of a phase shift gear and a phase shift rack. The phase shifting rack is used for being connected with a phase shifting part of an external phase shifter, when the phase shifting gear is meshed with the phase shifting rack, the phase shifting gear stays at the same position and rotates, the phase shifting rack can be driven to do linear movement corresponding to the rotation direction of the phase shifting gear along the length direction of the phase shifting rack, so that the phase shifting part connected with the phase shifting rack and the external phase shifter is driven to move, and the aim of controlling the phase shifting of the phase shifter in the frequency band is fulfilled.
The frequency selecting mechanism 2 comprises a transmission screw 21 axially arranged in parallel with the arrangement direction of the plurality of phase shifting assemblies 1 and a transmission nut 22 screwed with the transmission screw 21.
The drive nut 22 is fitted over the drive screw 21. The gear hole of the drive nut 22 is a threaded hole, and the threaded hole is matched with the drive screw 21, so that the drive nut 22 and the drive screw 21 form a drive screw mechanism. When the drive screw 21 rotates in the circumferential direction, the drive nut 22 does not rotate in the circumferential direction but is driven by the drive screw 21 to move linearly in the same direction as the direction in which the drive screw 21 rotates in the axial direction of the drive screw 21. The drive nuts 22 move within a range of positions of the plurality of phase shifting units 1 corresponding to the drive screws 21.
The phase shift mechanism 3 includes a connecting rod assembly 31 disposed on the transmission nut 22, and a driving gear 32 is fixedly disposed on the connecting rod assembly 31.
Referring to fig. 2, the link assembly 31 includes a plurality of connected triangular links 310 sequentially arranged along the axial direction of the phase shift screw 11, an output shaft 3111 is arranged on the triangular link 310 arranged at one end of the link assembly 31, and the driving gear 32 is fixedly arranged on the output shaft 3111. In two adjacent triangular links 310, three sub-rods 312 of one of the triangular links are respectively pivoted with three sub-rods 312 of the adjacent triangular link through the slide block 4.
Specifically, in some embodiments, the linkage assembly 31 is connected by three triangular links 310, including a middle triangular link 3101 and two end triangular links 3102 on either side of the middle triangular link 3101. As shown in fig. 3, the middle triangular link 3101 includes three sub-rods 312 extending outward from the same center, and connecting columns 313 disposed on both sides of the ends of the sub-rods 312. As shown in fig. 4, the end portion triangular link 3102 is different from the middle portion triangular link 3101 in that only one side of the end of each sub-rod 312 of the end portion triangular link 3102 is provided with a connecting column 313, and a moment transmission shaft 311 is further provided at the center of the end portion triangular link 3102. Two adjacent triangular connecting rods 310 are connected through a sliding block 4, and two ends of the sliding block 4 are respectively provided with a connecting round hole 41. The connection relationship of the link assembly 31 is as follows: the connecting column 313 of one sub-rod 312 of the end triangular link 3102 is inserted into one of the connecting round holes 41 of the slider 4, and the connecting column 313 of one sub-rod 312 of the middle triangular link 3101 is inserted into the other connecting round hole 41 of the slider 4. The three sub-rods 312 of the end triangular connecting rod 3102 are respectively pivoted with the three sub-rods 312 of the middle triangular connecting rod 3101 by three sliders 4. Meanwhile, the three connecting posts 313 on the other side of the middle triangular connecting rod 3101 are pivoted with the other end triangular connecting rod 3102 through the three sliders 4.
The torque transmission shaft 311 of the end portion triangular link 3102 at one end serves as an input shaft 3110 for torque input of the link assembly 31, and the torque transmission shaft 311 of the end portion triangular link 3102 at the other end serves as an output shaft 3111 for torque output of the link assembly 31. When the input shaft 3110 receives the transmission torque, the input shaft 3110 drives the end triangular connecting rod 3102, the end triangular connecting rod 3102 drives the middle triangular connecting rod 3101 through the slider, the middle triangular connecting rod 3101 drives the other end triangular connecting rod 3102 through the link slider 4, and finally the torque is transmitted to the output shaft 3111.
In other embodiments, the link assembly 31 may also include two or more middle triangular links 3101.
The phase shift mechanism 3 further comprises a fixed seat, the fixed seat is fixedly connected with the transmission screw rod 21, and the connecting rod assembly 31 is arranged on the fixed seat. The output shaft 3111 of link assembly 31 passes through the fixing base of drive nut 22 to at the fixed driving gear 32 that sets up in the end of output shaft 3111, make the driving gear 32 of phase shift mechanism 3 be located the fixing base of drive nut 22 and be close to the one end of phase shift assembly 1, the link assembly 31 of phase shift mechanism 3 is located the other end of the fixing base of drive nut 22. When the drive screw 21 rotates, the drive screw 21 drives the drive nut 22 to move linearly, and the drive nut 22 drives the drive gear 32 to simultaneously move in the same direction to be aligned and engaged with the phase shift gear 10 of any one of the phase shift assemblies 1. When the driving gear 32 is engaged with one of the phase shift gears 10 of the phase shift assembly 1, the connecting rod assembly 31 is driven to rotate, so that the connecting rod assembly 31 drives the driving gear 32 to rotate to drive the phase shift gear 10 to rotate, thereby driving the phase shift assembly 1 to shift the phase.
In other embodiments, the phase shift assembly 1 includes phase shift racks, and the driving nut 22 drives the driving gear 32 to simultaneously move in the same direction, and can be engaged with any one of the phase shift racks. By driving the link assembly 31 to rotate, the link assembly 31 drives the driving gear 32 to rotate so as to drive the phase shifting rack to perform the phase shifting operation.
The frequency-selective phase-shifting device also comprises a first motor 5 and a second motor 6. The first motor 5 is connected to the input shaft 3110 of the link assembly 31, and outputs a first driving torque to the link assembly 31, so as to control the number of rotations and the direction of rotation of the input shaft 3110.
The second motor 6 is connected with one end of the transmission screw 21, and outputs a second driving torque for the transmission screw 21, and controls the number of turns and the rotating direction of the transmission screw 21. When the phase shifting operation of the target phase shifting assembly 1 corresponding to a certain frequency band of the frequency-selecting phase-shifting device is required, the second motor 6 is driven to output driving torque for the transmission screw 21, so that the transmission screw 21 rotates, and further, the transmission nut 22 forming a screw transmission mechanism with the transmission screw 21 moves along the transmission screw 21. When the driving gear 32 is driven by the driving nut 22 to move to the position of the target phase shift assembly 1 and engage with the phase shift gear 10 of the target phase shift assembly 1, the driving of the second motor 6 is stopped, and the frequency selection operation of the frequency selection phase shift device is completed.
Then, the first motor 5 is driven, the first motor 5 drives the input shaft 3110 of the connecting rod assembly 31 to rotate, the connecting rod assembly 31 transmits the driving torque of the first motor 5 to the output shaft 3111 of the connecting rod assembly 31, the output shaft 3111 drives the driving gear 32 to rotate, and the driving gear 32 further drives the phase shift gear 10 engaged with the driving gear to rotate.
The phase shift gear 10 further drives the phase shift screw 11 fixedly connected with the phase shift gear, so that the phase shift member 12 moves along the phase shift screw 11. When the displacement of the phase shifter 12 reaches the displacement of the phase shifter of the corresponding frequency band required for phase modulation, the driving of the first motor 5 is stopped. This step completes the phase modulation of the phase shifter of the frequency band corresponding to the target phase shift assembly 1. The frequency-selecting phase-shifting device determines the rotation direction of the second motor 6 which needs to output the second driving torque and the time of outputting the driving torque according to the position of the target phase-shifting assembly 1 corresponding to the antenna frequency band to be selected in the plurality of phase-shifting assemblies 1 and the displacement direction of the transmission nut 22.
The direction in which the phase-shifting member 12 is to be moved and the amount of displacement of the phase-shifting member are determined in accordance with the demand for phase modulation of the target phase-shifting unit 1, thereby determining the rotational direction in which the first motor 5 is required to output the first driving torque and the time during which the first driving torque is output.
The frequency-selecting phase-shifting device also comprises a supporting seat, and the supporting seat is used for supporting the phase-shifting screw rod 11, the frequency-selecting mechanism 2 and the phase-shifting mechanism 3.
In other embodiments, the frequency-selective phase-shifting device may further include two rows of phase-shifting assemblies 1, the two rows of phase-shifting assemblies are arranged along the axial direction of the drive screw 21 and distributed on two sides of the drive screw 21, and the two rows of phase-shifting assemblies are arranged in a staggered manner. The driving gear 32 can be engaged with only one of the phase shift gears 10 of one row of the phase shift assembly 1 at a time during the movement along the drive screw 21. The number of the phase shift racks 1 can be set according to the specific requirements of the antenna frequency-selecting phase-shifting device, and is not limited herein.
In the above embodiment, the frequency-selecting phase-shifting device is provided with only one driving gear 32, in other embodiments, two driving gears 32 may be further provided on the phase-shifting mechanism 3, the two driving gears 32 share the fixing seat of the transmission nut 22, and only one driving gear 32 is meshed with the phase-shifting gear 10 at a time. Therefore, those skilled in the art can flexibly change different embodiments according to the spirit of the present invention, which is not repeated herein.
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 frequency-selecting phase-shifting device, wherein each phase-shifting part is provided with a phase-shifting component corresponding to one frequency-selecting phase-shifting device and is in linkage arrangement with the phase-shifting component.
In summary, the frequency-selecting phase-shifting device for phase modulation is optimized, has a simple structure, can more stably and simply realize phase modulation control on any frequency band signal in the multi-frequency antenna, and meets the requirements of increasing the frequency band of the antenna, along with simple and light structure and improvement on the reliability of the multi-frequency antenna.
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.
Claims (10)
1. A frequency-selecting phase-shifting device comprises phase-shifting components corresponding to a plurality of frequency bands arranged side by side, a frequency-selecting mechanism of the phase-shifting component controlled by a driving torque to select one of the frequency bands, and a phase-shifting mechanism controlled by the driving torque to perform phase-shifting control on the selected phase-shifting component, and is characterized in that:
the frequency selection mechanism comprises a transmission screw rod and a transmission nut, wherein the transmission screw rod is axially arranged in parallel to the arrangement direction of the plurality of phase shift assemblies, and the transmission nut is screwed with the transmission screw rod;
the phase shifting mechanism comprises a connecting rod assembly arranged on a transmission nut, and a driving gear is fixedly arranged on the connecting rod assembly;
the transmission screw drives the transmission nut to move linearly so as to drive the driving gear to be meshed with the phase shifting gear of any one phase shifting assembly in an aligned mode, and the driving gear rotates so as to drive the phase shifting gear to rotate so as to drive the phase shifting assembly to shift the phase.
2. The frequency-selective phase-shifting device according to claim 1, wherein the phase-shifting assembly comprises a phase-shifting screw and a phase-shifting member screwed with the phase-shifting screw, and the phase-shifting gear is fixedly arranged on the phase-shifting screw.
3. The frequency-selective phase-shifting device of claim 2, wherein the connecting rod assembly comprises a plurality of connected triangular connecting rods sequentially arranged along the axial direction of the phase-shifting screw, an output shaft is arranged on the triangular connecting rod arranged at one end of the connecting rod assembly, and the driving gear is fixedly arranged on the output shaft.
4. The frequency-selective phase-shifting device of claim 3, wherein the sub-rods of two adjacent triangular connecting rods are respectively pivoted one by one through the sliding blocks.
5. The frequency-selective phase-shifting device of claim 3, wherein an input shaft is provided on the triangular link rod disposed at the other end of the link assembly, the input shaft is connected to a first motor, and one end of the drive screw is connected to a second motor.
6. The frequency-selective phase-shifting device of claim 1, wherein the phase-shifting mechanism further comprises a fixing seat, the fixing seat is fixedly connected with the transmission screw, and the connecting rod assembly is disposed on the fixing seat.
7. The frequency-selective phase-shifting apparatus according to claim 2, further comprising a support base for supporting the phase-shifting screw, the frequency-selective mechanism and the phase-shifting mechanism.
8. The frequency-selective phase-shifting apparatus according to claim 2, wherein the phase-shifting gear is integrally formed with the phase-shifting screw.
9. The frequency-selective phase-shifting apparatus according to claim 1, wherein two rows of phase-shifting units are disposed on both sides of the axial direction of the drive screw, and the two rows of phase-shifting units are disposed in a staggered manner.
10. A multi-frequency antenna comprising a plurality of phase shifting units corresponding to a plurality of frequency bands, characterized in that it comprises the frequency-selective phase shifting apparatus according to any one of claims 1 to 9, each of said phase shifting units having a phase shifting component corresponding to one of said frequency-selective phase shifting apparatus and being linked therewith.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111646226.5A CN114361795A (en) | 2021-12-30 | 2021-12-30 | Multi-frequency antenna and frequency-selecting phase-shifting device thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111646226.5A CN114361795A (en) | 2021-12-30 | 2021-12-30 | Multi-frequency antenna and frequency-selecting phase-shifting device thereof |
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| CN114361795A true CN114361795A (en) | 2022-04-15 |
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| CN202111646226.5A Pending CN114361795A (en) | 2021-12-30 | 2021-12-30 | Multi-frequency antenna and frequency-selecting phase-shifting device thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115020945A (en) * | 2022-06-22 | 2022-09-06 | 京信通信技术(广州)有限公司 | Multi-frequency antenna and frequency-selecting phase-shifting module thereof |
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2021
- 2021-12-30 CN CN202111646226.5A patent/CN114361795A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115020945A (en) * | 2022-06-22 | 2022-09-06 | 京信通信技术(广州)有限公司 | Multi-frequency antenna and frequency-selecting phase-shifting module thereof |
| CN115020945B (en) * | 2022-06-22 | 2024-04-16 | 京信通信技术(广州)有限公司 | Multi-frequency antenna and frequency-selecting phase-shifting module thereof |
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