CN114300862B - A Ka-band circular polarization automatic switching and resetting device - Google Patents
A Ka-band circular polarization automatic switching and resetting deviceInfo
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- CN114300862B CN114300862B CN202210030307.0A CN202210030307A CN114300862B CN 114300862 B CN114300862 B CN 114300862B CN 202210030307 A CN202210030307 A CN 202210030307A CN 114300862 B CN114300862 B CN 114300862B
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Abstract
本发明涉及Ka频段卫星技术领域，特指一种Ka波段圆极化自动切换复位装置，包括极化方式自动获取系统以及传动系统，极化方式自动获取系统包括的GPS、调制解调器以及控制单元，GPS与调制解调器对应设置，调制解调器与控制单元对应设置，GPS用于自动获取当地地理位置，并将地理位置上传至调制解调器，调制解调器用于根据地理位置以及内部预置的KML地理信息协作与共享协议选择最适合的点波束，并将该波束的极化方式发送给控制单元，控制单元用于根据波束的极化方式控制传动系统自动工作。使得天线终端能够根据所处地理位置自动切换至所需的点波束极化方式，极大的降低了操作人员的技术要求，又提升用户网络体验。
The present invention relates to the field of Ka-band satellite technology, and particularly to a Ka-band circular polarization automatic switching and resetting device, comprising a polarization mode automatic acquisition system and a transmission system. The polarization mode automatic acquisition system comprises a GPS, a modem, and a control unit. The GPS and the modem are configured correspondingly, and the modem and the control unit are configured correspondingly. The GPS is used to automatically acquire the local geographic location and upload the geographic location to the modem. The modem is used to select the most suitable spot beam based on the geographic location and an internally preset KML geographic information collaboration and sharing protocol, and transmit the polarization mode of the beam to the control unit. The control unit is used to control the transmission system to automatically operate based on the polarization mode of the beam. This enables an antenna terminal to automatically switch to a desired spot beam polarization mode based on its geographic location, greatly reducing the technical requirements for operators and improving the user network experience.
Description
Technical Field
The invention relates to the technical field of Ka frequency band satellites, in particular to a Ka band circular polarization automatic switching resetting device.
Background
Compared with the traditional Ku frequency band satellite, the satellite transmission speed of the novel Ka frequency band is 3-5 times that of the traditional satellite at present, the anti-interference capability can be enhanced, and the novel Ka frequency band satellite can be interconnected with a ground network to perfectly realize an heaven-earth integrated satellite communication network. The Ka frequency band satellite adopts spot beam coverage, can concentrate radio frequency energy into a narrow beam with a small coverage area, and provides higher G/T and EIRP for the coverage area. The Ka satellite antenna adopts a circular polarization mode, and there is a difference in left-right rotation, which requires that the antenna terminal may need to switch different polarization directions at different geographic positions.
The existing polarization switching of Ka satellite antenna mostly adopts a manual switching mode, a receiving and transmitting unit of the satellite antenna mainly comprises a receiving and transmitting integrated machine, a sealing ring, a locking screw set, a circular polarizer, a waveguide adapter plate and a feed source, wherein physical ports of the receiving and transmitting integrated machine are separated receiving and transmitting channels and are in butt joint with the circular polarizer, a positioning clamping groove for left rotation or right rotation is designed on the receiving and transmitting integrated machine, a partition plate with a gradually changed height is designed in the middle of the circular polarizer and is relatively fixed with a positioning bayonet angle, and the receiving of left rotation or right rotation signals is completed according to the direction matched with the bayonet clamping groove. The sealing ring is arranged in a sealing groove on the circular polarizer, external dust and water vapor are prevented from entering a microwave channel in the transceiver, the service life of equipment is prolonged, in addition, the waveguide adapter and the feed source mainly radiate radio frequency power from a feeder line to a reflecting surface in the form of electromagnetic waves, so that the radio frequency power generates proper field distribution on caliber to form a required sharp beam or shaped beam, and meanwhile, the power leaked outwards from the edge of the reflecting surface is reduced as much as possible, so that the gain as high as possible is realized.
The prior art scheme mainly has the following defects that 1) the circular polarizer needs to be manually switched, each part of the receiving and transmitting unit is disassembled and then reassembled, time and labor are wasted, the risk of installation errors exists, operators are required to have stronger professional skills, 2) when the polarization mode is switched, the satellite antenna is powered off in a necessary section, although most of the Ka frequency band resources of the satellite in China are left-handed at present, factory setting time can be set by default in left-handed assembly, but if the using position of the satellite antenna is a left-handed spot beam overlapping area, the polarization mode needs to be frequently switched, and user network experience is seriously affected.
Disclosure of Invention
Aiming at the problems, the invention provides a Ka band circular polarization automatic switching resetting device, which effectively solves the defects in the prior art.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
The utility model provides a Ka wave band circular polarization automatic switch-over resetting means, including polarization mode automatic acquisition system and transmission system, polarization mode automatic acquisition system includes GPS, modem and control unit, GPS and modem correspond the setting, modem and control unit correspond the setting, GPS is used for automatic acquisition local geographic position, and upload geographic position to modem, modem is used for selecting the most suitable spot beam with shared agreement according to geographic position and the inside preset KML geographic information cooperation, and send the polarization mode of this beam to control unit, control unit is used for controlling transmission system automatic work according to the polarization mode of beam.
According to the scheme, the transmission system comprises a transceiver, a circular polarizer, a transmission assembly, an adjusting assembly, a feed source assembly and a driving assembly, wherein the first end of the circular polarizer is in seamless connection with a microwave channel port of the transceiver, the first end of the transmission assembly is connected with the second end of the circular polarizer, the first end of the transmission assembly is provided with a clamping assembly corresponding to the adjusting assembly, the second end of the transmission assembly is connected with the feed source assembly, and the driving assembly is started under the control of a control unit, so that the driving assembly drives the transmission assembly to work.
According to the above scheme, the drive assembly includes synchronous pulley, hold-in range and central pivot, and on the synchronous pulley was fixed in to the central pivot, synchronous pulley was connected with the second end of circular polarizer, was equipped with the screens subassembly of the corresponding screens of adjusting part on the synchronous pulley, and the central pivot is connected with feed source subassembly, and the first end winding of hold-in range is on synchronous pulley, and the second end cover of hold-in range is located on drive assembly's the output wheel.
According to the scheme, the adjusting component comprises an adjusting supporting bottom plate and a limiting cam, the limiting cam is fixed on the adjusting supporting bottom plate, the synchronous pulley is arranged in the limiting cam in a penetrating mode and is connected with the second end of the circular polarizer, a groove with a change curve is formed in the limiting cam, the angle range of the groove is 0-180 degrees, the axial height difference value is 0-3mm, the clamping component comprises a cam bearing and a cam ejector rod which are arranged on the synchronous pulley, the cam ejector rod is equal in diameter to the groove, and the cam ejector rod is arranged in the groove in a penetrating mode and is limited through the cam bearing.
According to the scheme, the feed source assembly comprises a deep groove ball bearing, a limiting photoelectric baffle, a photoelectric sensor and a feed source, wherein the deep groove ball bearing is connected to a central rotating shaft of the transmission assembly, the limiting photoelectric baffle is arranged on the deep groove ball bearing, the photoelectric sensor and the feed source are arranged on a motor mounting plate of the driving assembly, and the photoelectric sensor and the limiting photoelectric baffle are correspondingly arranged.
According to the above scheme, the drive assembly includes the driving motor of installing on the motor mounting panel, and driving motor begins or close work through receiving the instruction that control unit sent, is equipped with locating component between motor mounting panel and the regulation supporting baseplate of adjusting component.
According to the scheme, the positioning component comprises the linear flange bearing and the guide post, one end of the guide post is fixed on the motor mounting plate, and the other end of the guide post is fixed on the adjusting support bottom plate through the linear flange bearing.
According to the scheme, the driving motor is a stepping motor with an integrated incremental grating encoder, and the encoder resolution reaches 1000 lines.
According to the scheme, the connecting end of the circular polarizer is provided with the sealing groove, and the sealing ring is arranged in the sealing groove.
The invention has the beneficial effects that:
1) The Ka spot beam polarization mode automatic acquisition system reduces the requirements of operators and improves the user network experience;
2) The polarization mode automatic switching mechanism is characterized in that a stepping motor simultaneously controls linear motion of the circular polarizer and rotation motion of the limiting photoelectric baffle plate to complete a whole section of smooth fitting curve;
3) And a grating encoder and a photoelectric sensor are added to the closed-loop control calibration system on the basis of the transmission of the stepping motor, so that the positioning precision is improved, and the optimal electrical performance and the side lobe envelope are ensured.
Drawings
FIG. 1 is a control schematic diagram in a first embodiment;
FIG. 2 is a schematic diagram of the overall configuration of a transmission system;
FIG. 3 is an exploded view of the transmission system as a whole;
FIG. 4 is a schematic diagram of an assembly of a limit cam with a rotary synchronous pulley;
Fig. 5 is a control schematic diagram in the second embodiment.
1. The device comprises a transceiver, a sealing ring, a circular polarizer, an adjusting support bottom plate, a linear flange bearing, a guide pillar, a limiting cam, a synchronous pulley, a synchronous belt, a cam bearing, a cam ejector rod, a central rotating shaft, a deep groove ball bearing, a limiting photoelectric baffle, a photoelectric sensor, a motor mounting plate, a feed source, a driving motor, a sealing groove and a groove, wherein the linear flange bearing, the guide pillar, the limiting cam, the synchronous pulley, the synchronous belt, the cam bearing, the cam ejector rod, the central rotating shaft, the deep groove ball bearing, the limiting photoelectric baffle, the photoelectric sensor, the motor mounting plate, the feed source, the driving motor, the sealing groove and the groove 71.
Detailed Description
The technical scheme of the invention is described below with reference to the accompanying drawings and examples.
Embodiment one:
As shown in fig. 1 to fig. 4, the Ka band circular polarization automatic switching and resetting device of the present invention includes a polarization mode automatic acquisition system and a transmission system, the polarization mode automatic acquisition system includes a GPS, a modem and a control unit, the GPS is correspondingly disposed with the modem, the modem is correspondingly disposed with the control unit, the GPS is used for automatically acquiring a local geographic position and uploading the geographic position to the modem, the modem is used for selecting a most suitable spot beam according to the geographic position and a KML geographic information collaboration and sharing protocol preset in the modem, and transmitting the polarization mode of the beam to the control unit, and the control unit is used for controlling the transmission system to automatically work according to the polarization mode of the beam. The above constitutes the basic structure of the present invention.
According to the invention, when the satellite terminal is electrified, the GPS automatically acquires the local geographic position and uploads the local geographic position to the modem, the modem selects the most suitable spot beam according to the geographic position uploaded by the GPS and the KML geographic information preset in the modem and the sharing protocol, and then the information such as the polarization mode of the beam is sent to the control unit, and the control unit sends a working instruction to the transmission system according to the polarization mode of the beam, so that the antenna terminal can be automatically switched to the required spot beam polarization mode according to the geographic position, the technical requirements of operators are greatly reduced, the user network experience is improved, and meanwhile, the optimal electrical performance and side lobe envelope can be ensured by the high-precision positioning design, and the network access permission of satellite resources is completely met.
In this embodiment, the transmission system includes transceiver 1, circular polarizer 3, drive assembly, adjusting part, feed subassembly and drive assembly, and the first end of circular polarizer 3 is connected with transceiver 1's microwave channel port seamless, and drive assembly's first end is connected with circular polarizer 3's second end, and drive assembly's first end is equipped with the screens subassembly that corresponds the screens with adjusting part, and drive assembly's second end is connected with feed subassembly, and drive assembly passes through control unit control and starts for drive assembly drive transmission subassembly work. By adopting the structure, the control unit sends a working instruction to the driving assembly according to the polarization mode of the wave beam, so that the driving assembly drives the transmission assembly to carry out transmission work, the rotation action (namely circular polarization automatic switching) of the circular polarizer 3 is realized under the cooperation of the transmission assembly and the adjusting assembly, the radiation of the radio frequency power from the feed line to the reflecting surface in the form of electromagnetic waves is realized under the cooperation of the transmission assembly and the feed source assembly, the proper field distribution is generated on the caliber of the radio frequency power from the feed line, the required sharp wave beam or the shaped wave beam is formed, and meanwhile, the power leaked outwards from the edge of the reflecting surface is made to be as small as possible, so that the gain as high as possible is realized.
In practical application, through CONSOL software simulation verification, if the gap between the connecting end of the circular polarizer 3 and the microwave channel port of the transceiver 1 reaches 0.2mm, the change of return loss standing waves is small, the gain of the low-frequency 20GHz frequency band is not dropped in the usable range, the envelope is good, but the drop of the gain of 30GHz is more than 1dB, the envelope of a directional diagram is deteriorated, the axial ratio of an antenna is deteriorated by more than 2dB, and the optimal electrical property and the envelope of a side lobe cannot be ensured. Therefore, the requirement of the microwave system on the dimensional fit in the channel is extremely high, and a gap is reserved in the microwave channel by the circular polarizer 3, namely, a direct rotation driving switching mode is adopted in the prior art.
In this embodiment, the transmission assembly includes a synchronous pulley 8, a synchronous belt 9 and a central rotating shaft 12, the central rotating shaft 12 is fixed on the synchronous pulley 8, the synchronous pulley 8 is connected with the second end of the circular polarizer 3, a clamping assembly corresponding to the clamping position of the adjusting assembly is arranged on the synchronous pulley 8, the central rotating shaft 12 is connected with the feed source assembly, the first end of the synchronous belt 9 is wound on the synchronous pulley 8, and the second end of the synchronous belt 9 is sleeved on the output wheel of the driving assembly. By adopting the structure, when the driving assembly works, the synchronous belt 9 drives the synchronous belt pulley 8 to synchronously rotate, so that the synchronous belt pulley 8 drives the circular polarizer 3 to rotate (namely, circular polarization is automatically switched), and meanwhile, the synchronous belt pulley 8 drives the feed source assembly to rotate, thereby realizing the adjustment of relative zero position, and then determining the clockwise or anticlockwise rotation angle according to the polarization mode information given by the modem, and completing the rotation.
In this embodiment, the adjusting component includes an adjusting supporting base plate 4 and a limit cam 7, the limit cam 7 is fixed on the adjusting supporting base plate 4, the synchronous pulley 8 is arranged in the limit cam 7 in a penetrating manner and is connected with the second end of the circular polarizer 3, a groove 71 with a change curve is arranged on the limit cam 7, the angle range of the groove 71 is 0-180 degrees, the axial height difference is 0-3mm, the clamping component includes a cam bearing 10 and a cam ejector rod 11 which are arranged on the synchronous pulley 8, the cam ejector rod 11 has the same diameter with the groove 71, and the cam ejector rod 11 is arranged in the groove 71 in a penetrating manner and is limited by the cam bearing 10. By adopting the structure, when the driving assembly starts to drive the synchronous pulley 8 to rotate after obtaining a working instruction sent by the main control unit, the cam ejector rod 11 arranged on the synchronous pulley 8 can displace in the groove 71, so that the synchronous pulley 8 can drive the joint of the first end of the circular polarizer 3 and the transceiver 1 to be quickly separated, meanwhile, the rotation damping caused by external friction of the synchronous pulley 8 can be reduced, the load of the driving assembly is reduced, wherein when the change curve is 0-10 degrees, the height difference is changed from 0 to 3mm, and when the change curve is 10-170 degrees, the height difference is kept unchanged, and when the change curve is 170-180 degrees, the height difference is changed from 3mm to 0, so that the gap between the joint of the first end of the circular polarizer 3 and the transceiver 1 can be quickly reduced to 0.
In practical application, the cam ejector rod 11 on the synchronous pulley 8 is arranged in the groove 71 in a penetrating way, and also plays a role in radial positioning.
In this embodiment, the feed source assembly includes a deep groove ball bearing 13, a limiting photoelectric baffle 14, a photoelectric sensor 15 and a feed source 17, the deep groove ball bearing 13 is connected to the central rotating shaft 12 of the transmission assembly, the limiting photoelectric baffle 14 is mounted on the deep groove ball bearing 13, the photoelectric sensor 15 and the feed source 17 are mounted on a motor mounting plate 16 of the driving assembly, and the photoelectric sensor 15 and the limiting photoelectric baffle 14 are correspondingly arranged. By adopting the structure, after the driving assembly obtains the working instruction sent by the main control unit, the synchronous pulley 8 is driven to rotate clockwise, the synchronous pulley 8 drives the central rotating shaft 12 to rotate synchronously, the limit photoelectric baffle 14 can confirm that the relative zero position is reached after touching the photoelectric sensor 15, then the clockwise or anticlockwise rotating angle is determined according to the polarization mode information given by the modem, and the rotating action is completed.
In this embodiment, the driving assembly includes a driving motor 18 mounted on a motor mounting plate 16, the driving motor 18 starts or closes by receiving an instruction sent by the control unit, and a positioning assembly is disposed between the motor mounting plate 16 and the adjusting support base plate 4 of the adjusting assembly. By adopting the structure, when the driving motor 18 starts working after obtaining the working instruction sent by the main control unit, the synchronous belt 9 drives the synchronous belt pulley 8 to rotate, so that the rotation of the synchronous belt pulley 8 is realized, and the displacement of the circular polarizer 3 driven by the synchronous belt pulley 8 is realized, namely, the extension and retraction between the first end of the circular polarizer 3 and the transceiver 1 are realized.
In this embodiment, the positioning assembly includes a linear flange bearing 5 and a guide post 6, one end of the guide post 6 is fixed on the motor mounting plate 16, and the other end of the guide post 6 is fixed on the adjusting support base plate 4 through the linear flange bearing 5. By adopting the structure, the linear flange bearing 5 and the guide post 6 are used for axially positioning and connecting the adjusting support bottom plate 4 and the motor mounting plate 16, so that the smooth linkage of the transmission assembly, the adjusting assembly and the driving assembly can be ensured.
In this embodiment, the drive motor 18 is a stepper motor with an integrated incremental grating encoder with an encoder resolution of up to 1000 lines. By adopting the structure, the positioning accuracy can be greatly improved, that is, the positioning accuracy during the displacement of the circular polarizer 3 can be ensured, namely the angle of the circular polarizer 3 and the angle of the microwave channel in the transceiver integrated machine 1 are ensured to be absolutely consistent, a set of closed-loop control system is formed, and the electrical performance of the whole antenna system is improved.
In this embodiment, a sealing groove 31 is provided at the connection end of the circular polarizer 3, and a sealing ring 2 is installed in the sealing groove 31. By adopting the structure, the sealing ring 2 can prevent external dust and water vapor from entering the microwave channel in the transceiver integrated machine 1, thereby prolonging the service life and the electrical property of the whole system.
Embodiment two:
As shown in fig. 5, the second embodiment is different from the first embodiment in that the first embodiment adopts a structural combination of a single motor, a synchronous pulley 8 and a limit cam 7, and simultaneously completes the linear motion of the circular polarizer 3 and the rotary motion of the limit photoelectric baffle 14, while the second embodiment adopts a mechanism of a driving motor and a screw nut to complete the linear motion of the circular polarizer 3, and completes the rotary motion of the limit photoelectric baffle 14 by the driving motor and the synchronous pulley transmission mechanism, and the two sets of mechanisms do not interfere with each other, and each control unit sends a stepping command. In addition, in order to ensure that each action is positioned accurately, a stepping motor and a photoelectric sensor of an incremental grating encoder are selected.
While the embodiments of the present invention have been described, the present invention is not limited to the above-described embodiments, which are intended to be illustrative only and not limiting, and many forms can be made by those of ordinary skill in the art without departing from the spirit of the invention and the scope of the appended claims, which are to be construed as embodying the present invention.
Claims (6)
1. The utility model provides a Ka wave band circular polarization automatic switch-over resetting means which characterized in that:
the system comprises a polarization mode automatic acquisition system and a transmission system, wherein the polarization mode automatic acquisition system comprises a GPS, a modem and a control unit, the GPS is arranged corresponding to the modem, the modem is arranged corresponding to the control unit, the GPS is used for automatically acquiring a local geographic position and uploading the geographic position to the modem, the modem is used for selecting the most suitable spot beam according to the geographic position and a preset KML geographic information cooperation and sharing protocol and transmitting the polarization mode of the beam to the control unit, and the control unit is used for controlling the transmission system to automatically work according to the polarization mode of the beam;
The transmission system comprises a transceiver (1), a circular polarizer (3), a transmission assembly, an adjusting assembly, a feed source assembly and a driving assembly, wherein a first end of the circular polarizer (3) is in seamless connection with a microwave channel port of the transceiver (1), a first end of the transmission assembly is connected with a second end of the circular polarizer (3), a clamping assembly corresponding to the clamping of the adjusting assembly is arranged at the first end of the transmission assembly, a second end of the transmission assembly is connected with the feed source assembly, and the driving assembly is started under the control of a control unit, so that the driving assembly drives the transmission assembly to work;
The transmission assembly comprises a synchronous pulley (8), a synchronous belt (9) and a central rotating shaft (12), wherein the central rotating shaft (12) is fixed on the synchronous pulley (8), the synchronous pulley (8) is connected with the second end of the circular polarizer (3), a clamping assembly corresponding to the clamping position of the adjusting assembly is arranged on the synchronous pulley (8), the central rotating shaft (12) is connected with the feed source assembly, the first end of the synchronous belt (9) is wound on the synchronous pulley (8), and the second end of the synchronous belt (9) is sleeved on an output wheel of the driving assembly;
The adjusting assembly comprises an adjusting supporting bottom plate (4) and a limiting cam (7), wherein the limiting cam (7) is fixed on the adjusting supporting bottom plate (4), the synchronous pulley (8) penetrates through the limiting cam (7) and is connected with the second end of the circular polarizer (3), a groove (71) with a change curve is formed in the limiting cam (7), the angle range of the groove (71) is 0-180 degrees, the axial height difference is 0-3mm, the clamping assembly comprises a cam bearing (10) and a cam ejector rod (11) which are arranged on the synchronous pulley (8), the cam ejector rod (11) has the same diameter with the groove (71), and the cam ejector rod (11) penetrates through the groove (71) and is limited through the cam bearing (10).
2. The Ka band circular polarization automatic switching and resetting device according to claim 1, wherein the feed source assembly comprises a deep groove ball bearing (13), a limiting photoelectric baffle (14), a photoelectric sensor (15) and a feed source (17), the deep groove ball bearing (13) is connected to a central rotating shaft (12) of the transmission assembly, the limiting photoelectric baffle (14) is mounted on the deep groove ball bearing (13), the photoelectric sensor (15) and the feed source (17) are mounted on a motor mounting plate (16) of the driving assembly, and the photoelectric sensor (15) and the limiting photoelectric baffle (14) are correspondingly arranged.
3. The Ka band circular polarization automatic switching resetting device as set forth in claim 2, wherein the driving assembly comprises a driving motor (18) mounted on a motor mounting plate (16), the driving motor (18) starts or closes by receiving an instruction sent by the control unit, and a positioning assembly is arranged between the motor mounting plate (16) and an adjusting support bottom plate (4) of the adjusting assembly.
4. The Ka band circular polarization automatic switching and resetting device according to claim 3, wherein the positioning assembly comprises a linear flange bearing (5) and a guide post (6), one end of the guide post (6) is fixed on a motor mounting plate (16), and the other end of the guide post (6) is fixed on an adjusting support bottom plate (4) through the linear flange bearing (5).
5. The Ka-band circular polarization automatic switching resetting device as recited in claim 3, wherein the driving motor (18) is a stepping motor with an integrated incremental grating encoder, and the encoder resolution is up to 1000 lines.
6. The Ka band circular polarization automatic switching resetting device is characterized in that a sealing groove (31) is formed in the connecting end of the circular polarizer (3), and a sealing ring (2) is arranged in the sealing groove (31).
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| CN116914441B (en) * | 2023-09-14 | 2023-12-29 | 迪泰（浙江）通信技术有限公司 | Satellite antenna spin polarization switching method based on Ka band planar array |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013103432A2 (en) * | 2011-10-21 | 2013-07-11 | Antennasys, Inc. | Compact portable antenna positioner system and method |
| CN212542699U (en) * | 2020-08-17 | 2021-02-12 | 四川领航未来通信技术有限公司 | Satellite Antenna Feed Transition Waveguide Polarization Switching Control Device |
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| FR3035287B1 (en) * | 2015-04-15 | 2017-05-12 | Thales Sa | BROADBAND MULTI-STAGE SATELLITE SATELLITE RADIOCOMMUNICATION SYSTEM WITH IMPROVED FREQUENCY REUSE, AND REUSE METHOD THEREOF |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013103432A2 (en) * | 2011-10-21 | 2013-07-11 | Antennasys, Inc. | Compact portable antenna positioner system and method |
| CN212542699U (en) * | 2020-08-17 | 2021-02-12 | 四川领航未来通信技术有限公司 | Satellite Antenna Feed Transition Waveguide Polarization Switching Control Device |
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