WO2009102774A2 - Remote electrical tilt antenna with motor and clutch assembly - Google Patents
Remote electrical tilt antenna with motor and clutch assembly Download PDFInfo
- Publication number
- WO2009102774A2 WO2009102774A2 PCT/US2009/033773 US2009033773W WO2009102774A2 WO 2009102774 A2 WO2009102774 A2 WO 2009102774A2 US 2009033773 W US2009033773 W US 2009033773W WO 2009102774 A2 WO2009102774 A2 WO 2009102774A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- antenna
- tilt
- gear
- control device
- propagation direction
- Prior art date
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/246—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for base stations
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/005—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using remotely controlled antenna positioning or scanning
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
- H01Q3/30—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array
- H01Q3/32—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array by mechanical means
Definitions
- This invention relates to the field of cellular or mobile telephone base station antennas and, more particularly, relates to a remote electrical tilt (RET) base station antenna with a motor and clutch assembly that disengages the tilt motor to facilitate manual tilt adjustment.
- RET remote electrical tilt
- Antennas with variable electrical tilt (VET) functionality are known in the art. These antennas, which often are used in cellular networks, enable network operators to tilt the elevation beam pointing direction of an antenna by manually rotating a knob or translating a shaft on the exterior of the antenna.
- the knob or shaft is linked to phase shifters inside the antenna to convert the mechanical rotation or translation of the shaft to phase changes in the radio frequency beam forming network inside the antenna. Changes in phase between radiating elements inside the antenna cause the beam emitted from the antenna to tilt up or down relative to mechanical boresite of the antenna.
- An example of a cellular base station antenna demonstrating VET technology is depicted in US 7,068,236, which is incorporated by reference.
- Beam tilt adjustment is needed in cellular networks to reduce signal propagation between sites in the network in order to minimize signal interference and to maximize network capacity.
- Antennas with VET functionality allow network operators to make accurate tilt adjustments at a cell site without mechanically tilting the antenna and without changing the visual appearance of the site.
- Antennas with VET functionality typically include some sort of tilt indicator to provide visual feedback of the antenna electrical tilt setting to the person making the tilt adjustment.
- Remote electrical tilt (RET) antennas are also known in the art. RET antennas incorporate an electro-mechanical actuator attached to or installed inside of the antenna to rotate the knob or translate the shaft on a VET antenna. This enables the electrical tilt of the VET antenna to be controlled from a remote location, eliminating the expense of hiring a rigger to climb the tower and manually adjust the electrical tilt of the antenna beam.
- the electro-mechanical actuator attaches to the VET antenna at or near the manual tilt adjustment mechanism of the antenna. With the RET actuator installed, the tilt of the antenna can no longer be adjusted manually. In order to manually adjust the tilt of the antenna, the RET actuator must be physically removed or separated from the antenna to provide access to the manual tilt adjustment mechanism. Removing the actuator is often tedious and time consuming due to small attachment screws and delicate interface components. In addition, calibration can be lost between the electro-mechanical actuator and the antenna tilt setting once the actuator is removed. A calibration sequence must to be run to recalibrate the actuator to the antenna before proper remote operation can be restored. An improvement on the standard RET antenna design is depicted in US 7,286,092, which is incorporated by reference.
- the electro-mechanical actuator inserts inside the antenna body without blocking access to the manual tilt adjustment mechanism of the antenna.
- the tilt of this antenna can be adjusted manually using a 10mm wrench to rotate the tilt adjustment mechanism.
- the wrench is needed to overcome the mechanical resistance of the phase shifters plus the mechanical resistance of the motor.
- the motor does not separate from the drive chain during a manual tilt operation.
- the high torque DC motor is expensive by itself.
- the motor draws high current during tilt operations forcing the use of expensive, high current rated components on the controller circuit.
- RET antenna that allows for both electro-mechanical and manually tilt adjustment without losing the tilt calibration of the antenna.
- the present invention meets the need described above in a RET antenna with a motor and clutch assembly that is operative to mechanically disengage the DC motor and drive unit (also called the gear-motor unit) from the phase shifter adjustment shaft during a manual tilt operation. Disengaging the gear-motor unit removes the drag of the motor and the high gear ratio gear box from the phase shifter control rod making it easier to manually turn the phase shifter control knob.
- the clutch disengages the gear-motor without disengaging the position detector from the phase shifter control rod so that position calibration is not lost during manual tilt adjustment.
- the mechanical tilt clutch enables the gear-motor unit to be reliably re-engaged with the phase shifter control rod for motorized electrical tilt operation without having to recalibrate the position detector.
- the invention may be practiced in a base station antenna for a telecommunications system that is configured for remote electrical tilt ("RET") and manual tilt adjustment.
- the base station antenna may be a single or multiple-beam antenna with single or dual polarization elements.
- the base station antenna includes three dual polarization antenna arrays supported within a common antenna enclosure.
- one phase shifter can be used to control the pointing direction of an associated single or dual polarization antenna element.
- one of the antenna elements serves as a pivot point for beam tilting and, for this reason, need not have an associated phase shifter.
- the antenna includes a number of antenna elements for directing a beam of electromagnetic energy in a propagation direction.
- a number of phase shifters are operatively connected to the antenna elements for tilting the beam propagation direction.
- a control device is operatively connected to the phase shifters for operating the phase shifters to tilt the beam propagation direction.
- a gear-motor unit is operatively connected to the control device for electro-mechanically driving the control device to tilt the beam propagation direction.
- a manual beam tilt mechanism is operatively connected to the control device for manually driving the control device to tilt the beam propagation direction.
- a clutch is operative for disengaging the gear-motor unit from the control device to facilitate manual adjustment of the beam propagation direction and reengaging the gear-motor unit with the control device to permit electro-mechanical adjustment of the beam propagation direction.
- the antenna may also include a position detector operatively connected to the control device for registering movement of the control device to track changes in the beam propagation direction. The position detector remains operatively connected to the control device during manual and electro-mechanical adjustment of the beam propagation direction so that beam tilt calibration is not lost during manual or electro-mechanical adjustment of the beam propagation direction.
- the antenna is typically housed within an enclosure, the control extends through the antenna enclosure, and the tilt adjustment knob is connected to the control rod outside and proximate to the antenna enclosure.
- the removable cover selectively attaches to the antenna enclosure to cover tilt adjustment knob.
- the removable cover includes a collar configured to be manually inserted into the antenna enclosure to push the spring- loaded plunger mechanism against a spring bias of the mechanism to move the drive gear into engagement with the control gear when the cover is attached to the antenna enclosure.
- the spring-loaded plunger mechanism is further configured to move under the spring bias of the mechanism to disengage the drive gear from the control gear when the collar of the removable cover is manually removed from the antenna enclosure.
- the present invention provides a cost effective RET antenna that includes a mechanical clutch that separates a low current, low torque DC motor from the tilt adjustment mechanism to permit manual tilt adjustment of the antenna.
- the RET antenna also allows both electro-mechanical and manually tilt adjustment without losing the tilt calibration of the antenna.
- FIG. 1 is a conceptual illustration of a side view of a remote electrical tilt antenna with a motor and clutch assembly to facilitate manual tilt adjustment.
- FIG. 2 is a conceptual illustration of a front view of tri-band remote electrical tilt antenna with a motor and clutch assembly to facilitate manual tilt adjustment.
- FIG. 3 is a conceptual illustration of a front view of the tri-band remote electrical tilt antenna a tilt indicator removed for manual tilt adjustment.
- FIG. 4 is a conceptual block diagram of the motor and clutch assembly of the remote electrical tilt antenna with the motor in the engaged position.
- FIG. 5 is a conceptual block diagram of the motor and clutch assembly of the remote electrical tilt antenna with the motor in the disengaged position.
- FIG. 8 is a perspective view of an illustrative motor and clutch assembly for a tri-band remote electrical tilt antenna.
- FIG. 9 is a front view of an illustrative motor and clutch assembly for a remote electrical tilt antenna.
- FIG. 10 is a perspective view of the front side of a guide frame for an illustrative motor and clutch assembly for a remote electrical tilt antenna.
- FIG. 1 1 is a perspective view of the rear side of the guide frame for the illustrative motor and clutch assembly.
- FIG. 12 is a perspective view of the front side of a slide for an illustrative motor and clutch assembly for a remote electrical tilt antenna.
- the mechanical tilt clutch incorporates a shaft position detector to provide feedback to the remote control system to identify the current beam tilt of the antenna.
- the shaft position detector is fixed in location and does not disengage from the phase shifter drive shaft during electromechanical or manual or remote tilt operations. Calibration is set at the factory during antenna assembly and is not lost in the field during a manual tilt operation.
- the invention may be applied to single band antennas with only one electromechanical tilt actuator as well as multi-band antennas with multiple electromechanical tilt actuators.
- the mechanical tilt clutch allows the DC motor and drive unit to be engaged and disengaged from the exterior of the antenna using the tilt indicator cover.
- the tilt indicator cover When the tilt indicator cover is installed on the antenna body it encapsulates the manual tilt adjustment drive unit for the antenna, preventing access for manual operation. At the same time, the installed tilt indicator cover causes the DC motor and drive unit to become engaged with the phase shifter drive shaft. In this position, the antenna is ready for remote tilt operation.
- springs internal to the antenna body apply force to the DC motor and drive unit to disengage them from the phase shifter drive shaft.
- the tilt indicator cover is removed, the manual tilt adjustment unit for the antenna becomes exposed. In this position, the antenna is ready for manual adjustment.
- the tilt indicator cover is tethered to the antenna body with a length of cord to prevent losing the cover when it is disengaged during a manual tilt operation.
- the uninstalled cover dangling at the end of the cord is highly visible to the operator performing the manual tilt operation. It is very unlikely that the operator would leave the site without remembering to re-install the tilt indicator cover. It would be easy to visually inspect the antenna from the ground with binoculars to verify whether or not the tilt indicator cover had been properly reinstalled.
- Another embodiment of this invention could include turning a lever, pushing a button or rotating a screw on the exterior of the antenna to disengage the DC motor and drive unit from the phase shifter drive shaft. This is a less desirable solution since the screw, button or lever would be less visible than an uninstalled tilt indicator cover. The operator might forget to re-engage the device after completing the manual tilt operation and it would be difficult to verify proper reinstallation without climbing the tower.
- Another embodiment of this invention could be to press and hold or turn and hold a feature of the antenna to disengage the DC motor and drive unit during a tilt operation. When the manual tilt operation is completed the feature would be released. Springs inside the antenna could re-engage the DC motor and drive unit with the phase shifter drive shaft. This would prevent an operator from accidentally forgetting to re-engage the DC motor and drive unit but would also require two hands on the antenna during a manual tilt operation. This is undesirable from a climbing safety perspective.
- FIG. 1 is a conceptual illustration of a side view of a tri-band, dual polarization remote electrical tilt antenna 10 with a motor and clutch assembly to facilitate manual tilt adjustment.
- the basic construction and operation of tri-band, dual polarization remote electrical tilt antennas are well known.
- this particular example of this type of antenna includes three vertical arrays of dual- polarization antenna elements. Only one vertical array 12a is shown in the side view of FIG. 1 and many well known components are not shown to avoid cluttering the figure.
- the vertical array 12a which is carried on a back plane 14, includes a number of dual-polarization antenna elements 16a-n, each of which has its beam elevation controlled by an associated phase shifter 18a-n.
- the phase shifters implement vertical beam tilt, as shown conceptually in FIG. 1 .
- the antenna is covered by a radome 20 and carried within an antenna enclosureenclosure 22.
- the antenna as shown also includes a cable connector 24 for receiving RF antenna signals from a coaxial cable 26. Although only one cable connector shown, the antenna would typically have two cable connectors for each band, one for each polarization.
- RET remote electrical tilt
- the drive unit is a high gear ratio gear box that translates high speed, low torque motor rotation to lower speed, higher torque rotation of the drive gear turned by the motor.
- a relatively small number of antenna elements and associated phase shifters are shown in each vertical array to illustrate the conceptual design, but any sized array may be deployed.
- a typical tri-band antenna 2.7 meters tall could include 7 antenna elements for the lowest frequency band and 17 antenna elements for the highest frequency band.
- the center antenna element may serve as the electrical tilt pivot point and, for this reason, may not have an associated phase shifter for electrical tilt.
- Much detail, such as the power distribution networks, filters, grounding systems, RET communication equipment, and so forth have not been illustrated to avoid cluttering the figure.
- the phase shifters 16a-n of a vertical array have not been illustrated to avoid cluttering the figure.
- the antenna 10 includes a motor and clutch assembly for each vertical array that disengages the tilt motor from the phase shifter control rod to facilitate manual adjustment of the electrical tilt, which is accomplished by turning the manual adjustment knob 34a.
- FIGS. 2 and 3 are conceptual illustrations of the front side of the tri-band remote electrical tilt antenna 10 without the radome.
- the antenna includes three vertical arrays 12a-c of dual polarization antenna elements and associated phase shifters. The size and spacing of the antenna elements typically vary from array to array depending on the frequency band, but are shown aligned in FIG. 2 to simplify the conceptual illustration.
- the RET control unit is operational to control the electrical tilt of all three vertical arrays 12a-c, typically but not necessarily in a coordinated manner.
- the beam tilt indicators 32a-c, manual adjustment knobs 34a-c, and indicator covers 36a-c are located at the bottom of the antenna enclosure 22. As shown in FIG. 3, the indicator cover 36a may be removed to access the manual adjustment knob 34a for manual adjustment of the beam tilt of the associated array 12a. As noted previously, removing the indicator cover 36a mechanically disengages the RET beam tilt motor for the antenna array 12a from the associated phase shifter control rod to facilitate manual rotation of the control rod.
- the indicator cover 36a is preferably attached to the antenna enclosure 22 by a tether 38a so that the indicator cover will not become misplaced and to help to prompt the operator replace the indicator cover, and thereby re-engage the tilt motor, upon completion of manual tilt adjustment.
- FIGS. 4 and 5 are conceptual block diagrams of an illustrative motor and clutch assembly 40 for the remote electrical tilt antenna 10.
- Each antenna array 12a- c has a similar motor and clutch assembly (i.e., one motor and clutch assembly per band).
- FIG. 4 shows the antenna with the indicator cover installed and the motor in the engaged position
- FIG. 5 shows the antenna with the indicator cover removed and the motor in the disengaged position.
- FIG. 4 shows the bottom portion of the antenna enclosure 22 with a beam tilt indicator 32, manual adjustment knob 34, and indicator cover 36 located below the enclosure.
- the motor and clutch assembly 40 includes a guide frame 41 that is mounted to and does not move with respect to the antenna enclosure 22.
- the guide frame 41 includes a guide slot 42 in which a slide 60 carrying the tilt motor 62 and associated components including a gear box 64 slides as a spring-loaded plunger mechanism.
- the beam tilt indicator 32 and manual adjustment knob 34 are located on the bottom portion of a phase shifter control rod
- phase shifter control rod 43 Rotation of the phase shifter control rod 43, whether accomplished manually by rotation of the manual adjustment knob 34 or electrically by the tilt motor 62, causes vertical translation of the phase shifter control rod, which in turn adjusts the associated phase shifters to electrically tilt the beam emitted by the associated vertical antenna array.
- the phase shifter control rod 43 carries a main control gear
- the guide frame 41 supports a position detector 46, typically a potentiometer, which is driven by a position gear 48.
- the position gear 48 is driven by the control gear 44 to provide signals indicating rotation of the control rod 43.
- the guide frame 41 also supports a spring housing 50 that supports two return springs 52a-b that bias the slide 60 downward toward the bottom of the enclosure 22.
- the slide 60 translates vertically within the guide slot 42 and is biased toward the bottom of the antenna enclosure 22 by the return springs 52a-b.
- the slide 60 carries the motor 62 and a high gear ratio gear box 64, which are connected together to form an integral gear-motor unit.
- a drive gear 66 attached to the drive shaft of the gear-motor unit can be moved into engagement with the main control gear 44 to adjust the antenna tilt.
- the slide 60 also includes an abutment 68 that is positioned to be pushed by the indicator cover 36 as the indicator cover is pushed into the housing 22 and turned to latch in place. Pushing the latching the indicator cover 36 moves the abutment 68 and the entire slide 60 a distance "L” as indicated in FIGS. 4 and 5.
- FIG. 4 shows the motor and clutch assembly 40 with the indicator cover 36 pushed in and latched to the housing 22, which corresponds to the slide 60 being displace upward by a distance "L” to engage the drive gear 66 with the control gear 44 and thereby configure the antenna for motorized electrical tilt through operation of the motor 62.
- FIG. 5 shows the motor and clutch assembly 40 with the indicator cover 36 removed from the housing 22 and hanging from the tether 38.
- the indicator cover 36 includes a latch 37 for securing the indicator cover to the antenna enclosure and a transparent sight tube 39 for viewing the associated beam tilt indicator 32.
- this allows the slide 60 to travel downward a distance "L" under the force of the return springs 52a-b, which disengages the drive gear 66 from the control gear 44 and thereby configures the antenna for manual electrical tilt through rotation of the manual adjustment knob 34.
- the engagement and disengagement of the drive gear 66 and the control gear 44 represents the clutch action of the motor and clutch assembly 40.
- FIG. 5 also shows a guide pin 69 on top of the drive gear 66 that moves within a corresponding guide shaft in the spring housing 50 to the keep the drive gear from slipping on the control gear 44.
- the slide 60 also includes a motor mount, a tie-down boss for the gear- motor unit, and two guide prongs on which the return springs 52a-b are carried, which are shown FIG. 13.
- FIG. 6 is a perspective view of the bottom portion of the tri-band antenna 10 shown substantially to scale. For this particular antenna, the maximum width across the bottom of the antenna enclosure 22 is approximately 10 inches (24.5 cm) and the maximum depth across the bottom of the antenna enclosure is approximately 6 inches (14.2 cm). The height of the antenna is not shown and can vary considerably for different embodiments.
- a typical tri-beam antenna may be approximately 8 feet 10 inches (2.7 meters) tall.
- This view shows the radome 20, the back plane 14, and the antenna enclosure 22.
- the bottom of the enclosure carries six cable connectors represented by the enumerated cable connector 24.
- Each vertical array transmits and receives one band of the tri-band antenna, and each band has two cable connectors, one for each polarization.
- FIG. 7 is a perspective view of an illustrative indicator cover 36, which includes a latch 37, a tether 38, and a sight tube 39.
- the latch 37 includes a catch 31 that engages with a stop on the antenna enclosure 22 and a cuff 33 that extends into the antenna enclosure when the indicator cover is pushed into and turned to latch onto the housing.
- the distance “L” that the indicator cover moves the slide corresponds to the distance by which the cuff 33 extends beyond the catch 31. In this particular antenna, the distance “L” is approximately 0.5 inch (1 .3 cm). Referring to FIGS. 4 and 5, this is the same distance “L” that the slide 60 travels to engage and disengage the drive gear 66 with the control gear 44 to implement the clutch action of the motor and clutch assembly 40.
- FIG. 8 is a perspective view of an illustrative motor and clutch assembly 40 substantially to scale, which includes three motor and clutch units, one for each band.
- One representative motor and clutch assembly 40 has parts enumerated and some components are not illustrated to avoid cluttering the figure.
- FIG. 8 shows the beam tilt indicator 32, the manual adjustment knob 34, and the indicator cover 36 located below the antenna enclosure 22.
- the manual adjustment knob 34 is connected to the phase shifter control rod 43, which carries the control gear 44.
- the position detector 46 is driven by the position gear 48, which is engaged with the control gear 44.
- the motor 62, gear box 64, and drive gear 66 are shown in the disengaged position.
- the spring housing 50 is also shown in FIG. 8.
- FIG. 9 is a front view of an illustrative motor and clutch assembly 40.
- the beam tilt indicator 32 carried on the phase shifter control rod 43 are visible in this perspective view.
- This view shows the control gear 44, the position detector 46, and the position gear 48, which is engaged with the control gear 44.
- the slide 60, motor 62, gear box 64, drive gear 66, and abutment 68 are shown in the disengaged position.
- the spring housing 50 and the return springs 52a-b are shown with spring 52b labeled.
- the guide pin 69 on the top of the drive gear66, a cable tie 70 that attaches the bottom of the gear-motor unit to the slide, and the motor mount 80 are also shown in FIG. 9.
- FIG. 10 is a perspective view of the front side and FIG 1 1 is a perspective view of the rear side of the guide frame 41 , which includes the guide slot 42 in which the slide translates.
- the guide frame 41 includes a mounting plate 72, which includes a position indicator receptacle 74, a spring housing receptacle 75, and a control rod receptacle 76.
- the spring housing receptacle 75 includes two guide shafts 77 for the spring mounting prongs 87 on the slide (shown in FIGS. 12 and 13) and third guide receptacle 78 for the guide pin 69 on the drive gear 66 (shown in FIGS. 5 and 9).
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Details Of Aerials (AREA)
- Support Of Aerials (AREA)
- Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2725886A CA2725886C (en) | 2008-02-11 | 2009-02-11 | Remote electrical tilt antenna with motor and clutch assembly |
EP09709448A EP2248272A4 (en) | 2008-02-11 | 2009-02-11 | Remote electrical tilt antenna with motor and clutch assembly |
CN200980108722.6A CN102150374B (en) | 2008-02-11 | 2009-02-11 | Remote electrical tilt antenna with motor and clutch assembly |
MX2010008827A MX2010008827A (en) | 2008-02-11 | 2009-02-11 | Remote electrical tilt antenna with motor and clutch assembly. |
IL207479A IL207479A (en) | 2008-02-11 | 2010-08-08 | Remote electrical tilt antenna with motor and clutch assembly |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US2753008P | 2008-02-11 | 2008-02-11 | |
US61/027,530 | 2008-02-11 |
Publications (2)
Publication Number | Publication Date |
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WO2009102774A2 true WO2009102774A2 (en) | 2009-08-20 |
WO2009102774A3 WO2009102774A3 (en) | 2010-01-14 |
Family
ID=40957471
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2009/033773 WO2009102774A2 (en) | 2008-02-11 | 2009-02-11 | Remote electrical tilt antenna with motor and clutch assembly |
PCT/US2009/033774 WO2009102775A2 (en) | 2008-02-11 | 2009-02-11 | Multi-beam antenna with multi-device control unit |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2009/033774 WO2009102775A2 (en) | 2008-02-11 | 2009-02-11 | Multi-beam antenna with multi-device control unit |
Country Status (7)
Country | Link |
---|---|
EP (2) | EP2248272A4 (en) |
KR (1) | KR101589580B1 (en) |
CN (2) | CN102150325B (en) |
CA (2) | CA2725888C (en) |
IL (2) | IL207480A (en) |
MX (2) | MX2010008827A (en) |
WO (2) | WO2009102774A2 (en) |
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Also Published As
Publication number | Publication date |
---|---|
CN102150374B (en) | 2015-02-25 |
CN102150374A (en) | 2011-08-10 |
CN102150325A (en) | 2011-08-10 |
EP2253046A2 (en) | 2010-11-24 |
IL207479A (en) | 2017-12-31 |
EP2253046A4 (en) | 2013-01-16 |
EP2248272A4 (en) | 2013-01-16 |
EP2248272A2 (en) | 2010-11-10 |
CA2725888C (en) | 2018-09-25 |
CA2725886C (en) | 2017-06-27 |
WO2009102775A2 (en) | 2009-08-20 |
CA2725888A1 (en) | 2009-08-20 |
CA2725886A1 (en) | 2009-08-20 |
KR101589580B1 (en) | 2016-01-28 |
IL207480A (en) | 2016-03-31 |
EP2253046B1 (en) | 2020-10-28 |
MX2010008827A (en) | 2010-12-20 |
MX2010008830A (en) | 2010-12-20 |
IL207480A0 (en) | 2010-12-30 |
CN102150325B (en) | 2014-06-11 |
IL207479A0 (en) | 2010-12-30 |
KR20100122092A (en) | 2010-11-19 |
WO2009102774A3 (en) | 2010-01-14 |
WO2009102775A3 (en) | 2010-01-14 |
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