CN206673118U - Antenna and its angle control that has a down dip - Google Patents
Antenna and its angle control that has a down dip Download PDFInfo
- Publication number
- CN206673118U CN206673118U CN201720107436.XU CN201720107436U CN206673118U CN 206673118 U CN206673118 U CN 206673118U CN 201720107436 U CN201720107436 U CN 201720107436U CN 206673118 U CN206673118 U CN 206673118U
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- planetary gear
- down dip
- angle control
- gear
- hole
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Abstract
The utility model, which provides a kind of antenna and its angle control that has a down dip, the angle control that has a down dip, includes input mechanism, transmission mechanism, output mechanism and irreversible control；Input mechanism includes power input shaft and the driving gear with its synchronous axial system；Transmission mechanism includes the first planetary gear engaged with driving gear and the second planetary gear engaged with the first planetary gear；Output mechanism includes the more output shafts that can be engaged with the first planetary gear or the second planetary gear；Irreversible control controls the working condition of first, second planetary gear：When input shaft is rotated with the first direction of rotation, one in first, second planetary gear is engaged with one in more output shafts；When input shaft is rotated with the second direction of rotation, the first planetary gear or the second planetary gear drive the output shaft rotation engaged, and the direction of rotation of the twoth planetary gear is opposite.The angle control of the present utility model that has a down dip has the advantages of simple in construction, compact, small volume and control accuracy are high.
Description
Technical field
It the utility model is related to antenna of mobile communication base station technical field, more particularly to one kind has a down dip angle control, borrows
Help the device to realize the control of electrical down-tilting angle of more than one beam antenna, and be to realize each wave beam electrical down-tilting of antenna
The independent control at angle.
Background technology
With being continuously increased for mobile communication terminal user quantity, to the network capacity requirements of website in mobile cellular network
It is increasing, while require between different websites that minimum is accomplished in the interference between the even different sectors of same site, that is, realize
The minimum of maximization and the interference of network capacity.Realize this purpose, antenna downwards bevel beam angle in generally use adaptation stations
Mode realize.
At present, the mode for adjusting downwards bevel beam angle is divided into：Mechanical tilt and electrical tilt, and electrical tilt is with the obvious advantage,
It is current main flow and following development trend.The structure of the transmission device at traditional electrical tilt angle is more complicated, works as numbers of beams
When measuring more, inner antenna space can be caused larger, the size of whole transmission device is bigger than normal, and cost can be substantially improved.
Utility model content
Primary and foremost purpose of the present utility model aim to provide it is a kind of it is compact-sized, the speed of response is fast and control accuracy is high has a down dip
Angle control.
Another object of the present utility model is to provide a kind of antenna using the above-mentioned angle control that has a down dip, to reduce day
Line volume, the precision for improving angle of declination regulation.
To achieve these goals, the utility model provides following technical scheme：
One kind has a down dip angle control, for connecting multiple phase shifters and realizing the phase of multiple phase shifters switching may be selected
The control of position, it includes input mechanism, selection drive mechanism, output mechanism and irreversible control, wherein,
The input mechanism include be used for receive external impetus power input shaft and be set on power input shaft and with
The driving gear of its synchronous axial system；
The transmission mechanism includes the first planetary gear engaged with driving gear and the second row engaged with the first planetary gear
Star-wheel；
The output mechanism includes more equally distributed power output shafts, and which is provided with can be with the first planetary gear or second
Planetary gear meshed gears portion；
The irreversible control is used for the working condition for controlling the first planetary gear and the second planetary gear：Work as power input shaft
When being rotated with the first direction of rotation, one in first planetary gear and the second planetary gear with can selecting position with more power outputs
An engagement in axle；When power input shaft is rotated with the second direction of rotation, the first planetary gear or the second planetary gear drive with
Its power output shaft engaged rotates, and the direction of rotation of the first planetary gear and the second planetary gear is opposite.
Preferably, the irreversible control includes a pair of unilateral bearings for being respectively arranged at the control device both ends, and
And the opposite face to unilateral bearing is set in a manner of inner ring is in opposite direction with respect to outer ring rotating；The transmission mechanism also includes
The ring gear and planet carrier being fixedly connected respectively with two inner rings to unilateral bearing, the ring gear is around the driving tooth
Wheel, first, second planetary gear set and only engaged with the first planetary gear, the driving gear, the first planetary gear, the second planetary gear
On the planet carrier, and the planet carrier can rotate around the power input shaft.
Preferably, the driving gear offers the through hole at insertion both ends, offers on the planet carrier and is inputted for power
The avoid holes that axle passes through, the power input shaft sequentially pass through the through hole of a unilateral bearing, the through hole of driving gear, planet carrier
Avoid holes and another unilateral bearing through hole.
Preferably, the planet carrier is provided with what is coordinated with unilateral bearing inner ring without relative rotation back to the side of driving gear
Boss, and penetrate the boss and the avoid holes are set, the unilateral bearing entangles the boss.
Further, the control device also includes being used for the initial position identification mould for identifying the first planetary gear initial position
Block.
Preferably, the initial position identification module includes probe, and its planetary gear of face first is carried on the back located at the planet carrier
To the side of the first planetary gear.
Preferably, the initial position identification module also includes being used for the detection unit for identifying the probe, the detection
Unit is photoelectric sensor or the part that the probe is identified based on electromagnetic testing.
Preferably, the irreversible control also includes fixing two unilateral bearing outer rings from control device both ends respectively
Mounting seat and installation end cap, the mounting seat is provided with supported hole, and the installation end is covered with for power output shaft one
End passes the resigning hole being connected with phase shifter.
Preferably, the unilateral bearing periphery is provided with some locating slots, and the mounting seat is respectively provided with installation end cap
For housing the accommodating hole of the unilateral bearing, and accommodating hole inwall is provided with the positioning strip being engaged with the locating slot.
Preferably, the one end of the power output shaft away from gear part is set in multi-stage stairs shape, so that itself and resigning hole
The axial movement composition being engaged to power output shaft is spacing.
Preferably, the non-circular setting of the through hole of the driving gear, the portion that the power input shaft is connected with driving gear
Position is engaged setting with the through hole, to prevent relative rotation therebetween.
A kind of antenna, it includes above-mentioned have a down dip angle control and the shifting that is connected one to one with more power output shafts
Phase device.
Compared to prior art, scheme of the present utility model has advantages below：
The angle control of the present utility model that has a down dip, the work of first, second planetary gear is controlled by irreversible control
State, first, second planetary gear is carried out bit selecting when power input shaft is rotated with the first direction of rotation and nibbled with power output shaft
Close, when power input shaft is rotated with the second direction of rotation, driving power output shaft rotates forward or backwards to be exported to phase shifter
Power.The angle control of the present utility model that has a down dip has simple in construction, compact, and the speed of response is fast for transmission, control accuracy is high
Feature.
The additional aspect of the utility model and advantage will be set forth in part in the description, and these are by from following description
In become obvious, or by it is of the present utility model practice recognize.
Brief description of the drawings
The above-mentioned and/or additional aspect of the utility model and advantage from the following description of the accompanying drawings of embodiments will
Become obvious and be readily appreciated that, wherein：
Fig. 1 is the stereogram of the angle control of the present utility model that has a down dip；
Fig. 2 is the angle control cut-away view that has a down dip shown in Fig. 1, shows input mechanism, transmission mechanism and output
Matching relationship between mechanism；
Fig. 3 is the exploded view of the angle control that has a down dip shown in Fig. 1；
Fig. 4 is the stereogram of planet carrier of the present utility model；
Fig. 5 is the stereogram of mounting seat of the present utility model.
Embodiment
Embodiment of the present utility model is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning
Same or similar element is represented to same or similar label eventually or there is the element of same or like function.Below by ginseng
The embodiment for examining accompanying drawing description is exemplary, is only used for explaining the utility model, and can not be construed to of the present utility model
Limitation.
Fig. 1 to Fig. 5 collectively illustrates the angle control 1000 that has a down dip (hereinafter referred to as " control device ") of the present utility model,
Correspond and connect for multiple phase shifter (not shown) in multibeam antenna, and in its multiple power output shaft 3 and antenna
Connect, realized by the selection to multiple power output shafts 3, switching and driving to multiple phase shifter switching controls, so as to realize
The phase of multiple phase shifters is adjusted by a motor (not shown), and then realizes the control of angle of declination, makes more ripples
Beam antenna meets radiation characteristic and electrical characteristics.
Input mechanism that the control device 1000 includes being used to receive external impetus (such as torque of motor), for shifting
Phase device exports the output mechanism of power, for being synchronized with the movement with selection of the realization to phase shifter, switching and driving with input mechanism
It changes the irreversible control of the rotatable parts rotation direction in the transmission mechanism of phase, and control transmission mechanism.
The input mechanism includes the power input shaft 11 for receiving external impetus and is set in power input shaft 11
And the driving gear 12 of synchronous rotation.
The output mechanism includes more equally distributed power output shafts 3, which is provided with gear part.
The transmission mechanism includes the first planetary gear 21, the second planetary gear 22, planet carrier 23 and ring gear 24.Wherein, institute
The first planetary gear 21 is stated to engage with the driving gear 12；Second planetary gear 22 and ring gear 24 respectively with the first planetary gear
21 upper and lower ends engagement, and do not formed with driving gear 12 and engage assembly relation；The planet carrier 23 is used to install the
One planetary gear 21, the second planetary gear 22 and driving gear 12 and the meshing relation for keeping three.First planetary gear 21 or the
Two planetary gears 22 engage in which can select position with the gear part of any one power output shaft 3, to realize the choosing of multiple power output shafts 3
Selecting property switches and power is reached into output mechanism from input mechanism.
The irreversible control includes a pair of structure identical unilateral bearings 41,42, and the inner ring of the unilateral bearing can
With the relative outer ring rotating of a rotation direction (such as clockwise direction), turn in opposite rotation direction with outer ring without relative
It is dynamic.For the ease of description, it is respectively the first unilateral bearing 42 and the first unilateral bearing to define two bearings to unilateral bearing
41。
(inner ring is with respect to outer ring with usable rotational direction for the opposite face of the unilateral bearing 41 of first unilateral bearing 42 and first
Usable rotational direction) opposite mode is installed in the upper and lower ends of the control device, and the inner ring of the first unilateral bearing 42 and institute
State planet carrier 23 to be fixedly connected, the inner ring of the first unilateral bearing 41 is fixedly connected with the ring gear 24.
Hereafter with the first unilateral bearing 42 in face of the one side of planet carrier 23, the first unilateral bearing 41 back to the one of planet carrier 23
Face is the front plane of reference, to illustrate the operation principle of control device of the present utility model.
When power input shaft 11 is rotated with the first direction of rotation (such as clockwise direction), driving gear 12 turns clockwise
Dynamic, first planetary gear 21 rotates counterclockwise, so as to drive the second planetary gear 22 engaged and ring gear 24 counterclockwise
Rotate, drive the first unilateral bearing 41 to rotate counterclockwise, because the inner ring of the first unilateral bearing 41 can not its relative outer ring inverse time
Pin rotates, thus the position of locking ring gear 24 so that what the first planetary gear 21 and the second planetary gear 22 limited along ring gear 24
Track is revolved round the sun clockwise around driving gear 12, so as to drive planet carrier 23 and first unilateral bearing 42 affixed with planet carrier 23
Inner ring rotate clockwise, so as to realize the first planetary gear 21 or the second planetary gear 22 with selecting position with a wherein power output shaft
3 engagements.Wherein, when one in the first planetary gear 21 and the second planetary gear 22 engages with power output shaft 3, another is not
Engaged with any power output shaft 3.Hereby it is achieved that the selectivity of more power output shafts 3 is switched.
When the first planetary gear 21 or the second planetary gear 22 engage with the gear part of power output shaft 3 to be driven, power
Input shaft 11 is rotated with the second direction of rotation (such as counter clockwise direction), and driving gear 12 rotates counterclockwise, the first planetary gear 21
Drive the unilateral bearing 41 of ring gear 24 and first to rotate clockwise, drive the inner ring inverse time of the unilateral bearing 42 of planet carrier 23 and first
Pin rotates, because the inner ring of the first unilateral bearing 42 can not rotate counterclockwise with respect to outer ring, thus the position of locking planet carrier 23,
So that first, second planetary gear 22 dallies around respective rotating shaft rotation, ring gear 24.Wherein, first, second planetary gear 22
Rotation direction on the contrary, so as to realize the driving forward or backwards to power output shaft 3.
In above example, power input shaft 11 rotates for the first direction of rotation realize first, second row in a clockwise direction
Star-wheel 22 switches to the selectivity of power output shaft 3, is realized in a counterclockwise direction for the second direction of rotation to power output shaft 3
Forward and reverse driving.In other embodiments, power input shaft 11 can also realize that power is defeated for the first direction of rotation counterclockwise
The switching of shaft 3, the inner ring of unilateral bearing specifically can be rationally set as needed by those skilled in the art with respect to outer ring rotating
Realize in direction.
Relative to prior art, control device of the present utility model need not set more to be engaged with power output shaft 3
Asessory shaft, structure are simpler, compact；Realized by unilateral bearing unidirectionally controlled, and then realize more power output shafts 3
Switching and forward and reverse driving, power transmission response is fast, and control is more accurate, is advantageously implemented the accurate control to angle of declination.Separately
Outside, because accessory is less, relative to prior art, control device of the present utility model also more saves installation time and cost.
Preferably, it is provided with the planet carrier 23 in homonymy and is used to driving gear 12, the first planetary gear 21, the second row are installed
The installation position 232,233,234 of star-wheel 22, the installation position that driving gear 12 is corresponded in relative side are provided with a boss 231, should
The inner ring of the unilateral bearing 42 of boss 231 and first is set without relative rotation, and the boss 231 has avoid holes.Described first
Unilateral bearing 42 entangles the boss 231 securely, and first planetary gear 21, the second planetary gear 22 are located at institute by cantilever
On the installation position for stating planet carrier 23, the driving gear 12 is provided with through hole, and with the avoid holes of its through-hole alignment planet carrier 23 after
It is serially connected by pass through the input shaft of the through hole of the first unilateral bearing 42.It should be noted that the driving gear 12 can be
Input shaft rotates under driving relative to planet carrier 23.
The described one end of ring gear 24 away from planet carrier 23 is provided with panel (non-label), and middle panel is formed and first
The inserting column 241 that the inner ring of unilateral bearing 41 is engaged, and the inner ring of first unilateral bearing 41 can not relatively described 241 turns of inserting column
It is dynamic.It should be appreciated that the through hole of insertion panel is opened up in the middle part of the inserting column, so that power input shaft 11 passes.
The more power output shafts 3 are uniformly distributed around the periphery of ring gear 24, and gear part located at ring gear 24 with
It can engage between planet carrier 23 and with the first planetary gear 21 or the second planetary gear 22.
Preferably, the non-circular setting of through hole of the driving gear 12, the power input shaft 11 connect with driving gear 12
The cooperating therewith setting in position connect, relatively rotates when being rotated to prevent stopping power input shaft 11 with driving gear 12, so as to
Influence power laser propagation effect, and then under the influence of pitch angle control accuracy.For example, the section of the through hole of the driving gear 12 is
During regular hexagon, the corresponding position of power output shaft 3 is set to positive six prismsby shape.
The control device also includes being used for the initial position identification module for identifying the initial position of the first planetary gear 21.
Preferably, the initial position identification module includes probe 5 and identifies the detection unit of the probe 5.The probe is just
To first planetary gear 21 located at the planet carrier 23 back to the side of the first planetary gear 21, and it is rotationally described
Detection unit identifies, when detection unit described in the probe trigger, characterizes it and turns to predeterminated position (i.e. initial position).It is excellent
Selection of land, the detection unit are photoelectric sensor or the part that the probe is can recognize that based on electromagnetic testing.Pass through mark
The initial position of first planetary gear 21, advantageously ensure that the degree of accuracy of angle of declination regulation.
Preferably, the irreversible control also includes fixing two unilateral bearing outer rings from control device both ends respectively
Mounting seat 43 be provided with supported hole 431 with installation end cap 44, the mounting seat, the end cap 44 of installing offers confession
The one end of power output shaft 3 passes the resigning hole 441 being connected with phase shifter.
The unilateral bearing periphery is provided with the groove 413 on locating slot, such as the second unilateral bearing periphery 411, described
Mounting seat 43 and installation end cap 44 are respectively provided with the accommodating hole 432,442 for housing the unilateral bearing, and accommodating hole
432nd, locating slot is corresponded on 442 inwalls and is provided with positioning strip 433,443 with matching, so that the positioning strip is caught in locating slot
The rotation of unilateral bearing outer ring is limited afterwards.
In another embodiment, the mounting seat and installation end are covered provided with locating slot, outside the unilateral bearing
Positioning strip is set on circle, or positioning strip and locating slot cover in mounting seat and installation end setting, can also realize list
The purpose fixed to bearing outer ring.
In the present embodiment, the locating slot is evenly distributed with multiple on unilateral bearing outer ring.In other embodiment
In, the locating slot discrete can also be distributed with multiple, or being provided only with one or radially distributed a pair.
Preferably, the described one end of power output shaft 3 away from gear part is set in multi-stage stairs shape, so that itself and installation end
The axial movement composition that the resigning hole of lid is engaged to power output shaft 3 is spacing, to ensure that power output shaft 3 inputs by power
Axle 11 engages with the first planetary gear 21 or the second planetary gear 22 all the time during rotating driving.
In addition, initial position identification module of the present utility model can be used for other angle controls that have a down dip as standalone module
In, using and changing in order to the angle control that has a down dip.
In addition, the utility model further relates to a kind of antenna (not shown) using the above-mentioned angle control that has a down dip, its power
Input shaft 11 is connected on motor output shaft, the connection corresponding with the connection member (such as screw rod) of phase shifter of power output shaft 3.
Due to that need not set the more asessory shafts being engaged with power output shaft 3, antenna structure of the present utility model is more
Simply, it is compact；Realized by unilateral bearing unidirectionally controlled, and then realize the switchings of more power output shafts 3 and forward and reverse drive
Dynamic, power transmission response is fast, and control is more accurate, is advantageously implemented the accurate control to Downtilt.
Described above is only some embodiments of the present utility model, it is noted that for the common skill of the art
For art personnel, on the premise of the utility model principle is not departed from, some improvements and modifications can also be made, these improve and
Retouching also should be regarded as the scope of protection of the utility model.
Claims (12)
- The angle control 1. one kind has a down dip, for connecting multiple phase shifters and realizing the phase of multiple phase shifters switching may be selected Control, it includes input mechanism, transmission mechanism, output mechanism and irreversible control, it is characterised in thatThe input mechanism includes the power input shaft for receiving external impetus and is set on power input shaft and same with its Walk the driving gear rotated；The transmission mechanism includes the first planetary gear engaged with driving gear and the second planetary gear engaged with the first planetary gear；The output mechanism includes more equally distributed power output shafts, and which is provided with can be with the first planetary gear or the second planet Take turns meshed gears portion；The irreversible control is used for the working condition for controlling the first planetary gear and the second planetary gear：When power input shaft is with When one direction of rotation rotates, one in first planetary gear and the second planetary gear with can selecting position with more power output shafts One engagement；When power input shaft is rotated with the second direction of rotation, the first planetary gear or the second planetary gear drive and nibbled with it The power output shaft of conjunction rotates, and the direction of rotation of the first planetary gear and the second planetary gear is opposite.
- 2. the angle control according to claim 1 that has a down dip, it is characterised in that the irreversible control includes setting respectively A pair of unilateral bearings at the control device both ends are placed in, and the opposite face to unilateral bearing is with the relative outer ring rotating side of inner ring Set to opposite mode；The transmission mechanism also includes the ring gear and planet carrier being fixedly connected respectively with two inner rings to unilateral bearing, institute Ring gear is stated to set and only engage with the first planetary gear, the driving tooth around the driving gear, first, second planetary gear Wheel, first, second planetary gear are on the planet carrier, and the planet carrier can rotate around the power input shaft.
- 3. the angle control according to claim 2 that has a down dip, it is characterised in that the driving gear offers insertion both ends Through hole, offer the avoid holes passed through for power input shaft on the planet carrier, the power input shaft sequentially passes through one The through hole of unilateral bearing, the through hole of driving gear, the through hole of the avoid holes of planet carrier and another unilateral bearing.
- 4. the angle control according to claim 3 that has a down dip, it is characterised in that the planet carrier back to driving gear one Side is provided with the boss coordinated with unilateral bearing inner ring without relative rotation, and penetrates the boss and set the avoid holes, the list Boss is stated to bearing holder (housing, cover) residence.
- 5. the angle control according to claim 3 that has a down dip, it is characterised in that also include at the beginning of being used to identify the first planetary gear Beginning position initial position identification module.
- 6. the angle control according to claim 5 that has a down dip, it is characterised in that the initial position identification module includes visiting Pin, its planetary gear of face first are located at the planet carrier back to the side of the first planetary gear.
- 7. the angle control according to claim 6 that has a down dip, it is characterised in that the initial position identification module also includes For identifying the detection unit of the probe, the detection unit is for photoelectric sensor or based on electromagnetic testing to the spy The part that pin is identified.
- 8. the angle control according to claim 2 that has a down dip, it is characterised in that the irreversible control also includes difference The mounting seat of two unilateral bearing outer rings is fixed from control device both ends and installation end cap, the mounting seat are provided with branch Hole is supportted, the installation end cap offers resigning hole, and one end of the power output shaft is rotatably supported in supported hole, another End passes the resigning hole and is used to connect phase shifter.
- 9. the angle control according to claim 8 that has a down dip, it is characterised in that the unilateral bearing periphery is provided with some Locating slot, the mounting seat are respectively provided with the accommodating hole for housing the unilateral bearing with installation end cap, and in accommodating hole Side wall is provided with the positioning strip being engaged with the locating slot.
- 10. the angle control according to claim 8 that has a down dip, it is characterised in that the power output shaft is away from gear part One end set in multi-stage stairs shape so that its be engaged with resigning hole axial movement to power output shaft form it is spacing.
- 11. the angle control according to claim 3 that has a down dip, it is characterised in that the through hole of the driving gear is non-circular Set, the position that the power input shaft is connected with driving gear is engaged setting with the through hole of the driving gear, to prevent Therebetween relative rotation.
- 12. a kind of antenna, it includes the angle control and defeated with more power of having a down dip described in claim 1 to 11 any one The phase shifter that shaft connects one to one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720107436.XU CN206673118U (en) | 2017-01-26 | 2017-01-26 | Antenna and its angle control that has a down dip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720107436.XU CN206673118U (en) | 2017-01-26 | 2017-01-26 | Antenna and its angle control that has a down dip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206673118U true CN206673118U (en) | 2017-11-24 |
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ID=60379039
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720107436.XU Active CN206673118U (en) | 2017-01-26 | 2017-01-26 | Antenna and its angle control that has a down dip |
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| Country | Link |
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| CN (1) | CN206673118U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106785451A (en) * | 2017-01-26 | 2017-05-31 | 京信通信系统（中国）有限公司 | Antenna and its angle control that has a down dip |
| WO2019128283A1 (en) * | 2017-12-30 | 2019-07-04 | 京信通信系统（中国）有限公司 | Phase adjustment system of phase shifter and power transmission device thereof |
-
2017
- 2017-01-26 CN CN201720107436.XU patent/CN206673118U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106785451A (en) * | 2017-01-26 | 2017-05-31 | 京信通信系统（中国）有限公司 | Antenna and its angle control that has a down dip |
| CN106785451B (en) * | 2017-01-26 | 2023-10-27 | 京信通信技术(广州)有限公司 | Antenna and downtilt angle control device thereof |
| WO2019128283A1 (en) * | 2017-12-30 | 2019-07-04 | 京信通信系统（中国）有限公司 | Phase adjustment system of phase shifter and power transmission device thereof |
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Effective date of registration: 20200201 Address after: 510730 No. 6, layered Road, Guangzhou economic and Technological Development Zone, Guangdong Patentee after: COMBA TELECOM TECHNOLOGY (GUANGZHOU) Ltd. Address before: 510663 Guangzhou Science City, Guangdong Shenzhou Road, No. 10 Co-patentee before: COMBA TELECOM TECHNOLOGY (GUANGZHOU) Ltd. Patentee before: Comba Telecom System (China) Ltd. Co-patentee before: COMBA TELECOM SYSTEMS (GUANGZHOU) Ltd. Co-patentee before: TIANJIN COMBA TELECOM SYSTEMS Ltd. |