Method of and apparatus for antenna alignment

• US 20030071762A1
• Filed: 10/12/2001
• Published: 04/17/2003
• Est. Priority Date: 10/12/2001
• Status: Active Grant

• Current Assignee: CommScope Technologies, LLC (CommScope Holding Company, Inc.)
• Original Assignee: Andrew Corporation (CommScope Holding Company, Inc.)
• Inventors: Tulloch, Tom
• Granted Patent: US 6,657,598 B2
• Time in Patent Office: Days
• US Class Current: 343/882
• CPC Class Codes: H01Q 1/1257 using the received signal strength
• CPC Class Codes: H01Q 19/132 Horn reflector antennas; Off-set feeding

Abstract

An alignment mechanism to assist in antenna alignment is described. The alignment mechanism has a first attachment element for removably attaching to an antenna mounting member, a threaded sleeve member affixed to the first attachment element, a threaded bushing for threadably engaging the threaded sleeve member, and a handle member provided for rotating the threaded bushing. A second attachment element is provided for removably attaching to an antenna mounting base member. The second attachment element is operatively connected to the threaded bushing. A biasing member is adapted for biasing the first attachment member apart from the second attachment member. An adjustment member is threadably connected to the second attachment element and operatively connected to the threaded bushing, the adjustment member for selectively adjusting an axial distance between the first attachment member and the second attachment member. The alignment mechanism is used to align an antenna by affixing an alignment mechanism to an orienting member and to a stationary member on an antenna mounting assembly by noting a preliminary length of the alignment mechanism and noting the signal strength at a first antenna orientation. The alignment mechanism is then expanded by a select length, which changes the orientation of the dish in a first direction. The signal strength at a second antenna orientation is then noted and the alignment mechanism is contracted by a select length, which changes the orientation of the antenna in a second direction. The signal strength at a third antenna orientation is noted. The alignment mechanism is returned to the preliminary length by means of a centering or camming member. If necessary, a length of the alignment mechanism is adjusted to obtain a new preliminary length and the steps of expanding and contracting the alignment mechanism until the preliminary length corresponds to signal strength that is stronger than the signal strength at the second antenna orientation and the third antenna orientation. The antenna is then secured in a desired orientation.

Claims

1. A waggle tool comprising:

a first attachment element for removably attaching to an antenna mounting member;

a threaded sleeve member affixed to said first attachment element;

a threaded bushing for threadably engaging said threaded sleeve member;

a waggle member for rotating said threaded bushing;

a second attachment element for removably attaching to an antenna mounting base member, said second attachment element operatively connected to said threaded bushing; and

a biasing member adapted for biasing said first attachment member apart from said second attachment member;

2. The waggle tool according to claim 1 wherein:

said waggle member is a handle member.

3. The waggle tool according to claim 1 wherein:

said waggle member is a motor engaging sleeve.

4. The waggle tool according to claim 1 further comprising:

an adjustment member threadably connected to said second attachment element and operatively connected to said threaded bushing, said adjustment member for selectively adjusting an axial distance between said first attachment member and said second attachment member.

5. The waggle tool according to claim 4 wherein:

said adjustment member is connected to said threaded bushing at a ball joint, which permits relative rotation between said adjustment member and said threaded bushing.

6. The waggle tool according to claim 4 wherein:

said adjustment member is connected to said threaded bushing at a ball joint, which permits relative axial deflection of said adjustment member with respect to said threaded bushing.

7. The waggle tool according to claim 6 wherein:

said axial deflection is at least 3°

.

8. The waggle tool according to claim 1 further comprising:

a centering device at an interface between said first attachment element and said handle member for locating said first attachment element and said handle member in a desired rotational orientation.

9. The waggle tool according to claim 8 wherein said centering device comprises:

a recess on said first attachment element;

a protrusion on said waggle member for complementary engagement with said recess on said first attachment element; and

wherein

said biasing member forces said protrusion into said recess for indicating a desired rotational orientation between said first attachment element and said waggle member.

10. The waggle tool according to claim 1 wherein:

said first attachment element has a receptacle having a chamfered hole;

an attachment bolt located in said receptacle for securing the waggle tool to a device, said attachment bolt having a head with a chamfered underside, said chamfered underside for engagement with said chamfered hole for minimizing backlash.

11. The waggle tool according to claim 1 further comprising:

a key slot on said threaded bushing;

a keyway on said waggle member; and

a key located in said key slot and said keyway, said key for operatively locking said threaded bushing and said handle member together so that said threaded bushing and said handle member

12. The waggle tool according to claim 1 further comprising:

a first stop on said first attachment element;

a second stop on said first attachment element;

a stop block on said waggle member having a first stop surface for selective abutment with said first stop on said first attachment member and a second stop surface for selective abutment with said second stop on said first attachment element, said abutment for defining, a discrete amount of rotation capable by said waggle member.

13. The waggle tool according to claim 1 further comprising:

an external sleeve slidably mounted on said second attachment element, said external sleeve having a first end that abuts said waggle member and a rim for engaging a first end of said biasing member; and

a seat on said second attachment element for receiving a second end said biasing member;

wherein said spring biases said handle member away from said second attachment element.

14. The waggle tool according to claim 1 further comprising:

an external sleeve slidably mounted on said second attachment element, said external sleeve having a second end;

markings on an outer surface of said second attachment element; and

wherein said markings are used to determine an extent of linear expansion/contraction of the waggle tool.

15. The waggle tool according to claim 1 wherein:

said second attachment element has a receptacle having a chamfered hole; and

an attachment bolt located in said receptacle for securing the waggle tool to an antenna mounting member, said attachment bolt having a head with a chamfered underside, said chamfered underside for engagement with said chamfered hole for minimizing backlash.

16. An antenna alignment system comprising:

an antenna mounting assembly adapted for select positioning and securing of an antenna; and

a waggle tool adapted for coupling to said antenna mounting assembly for select adjustment of the antenna into a first set position and a subsequent, staged waggle movement thereabout.

17. The antenna alignment system according to claim 16 wherein said antenna mounting assembly is adapted for select positioning and securing of azimuthal and elevational orientations of the antenna;

and

said waggle tool is adapted for coupling to said mounting assembly for select adjustment of said azimuthal and said elevational orientations of said antenna.

18. The antenna alignment system according to claim 17 wherein said antenna mounting assembly for said azimuthal positioning includes a base mounting member from which the azimuthal position of the antenna is secured and an antenna support member, the position thereof relative to said base mounting member defining the azimuthal orientation of the antenna, and wherein said waggle tool is adapted for demountable coupling to said base mounting member and said antenna support member for adjusting antenna azimuthal orientation in a first set position and for adjusting antenna azimuthal orientation with a stepped waggle movement thereabout.

19. The antenna alignment system according to claim 17 wherein said antenna mounting assembly for said elevational positioning includes a mounting member from which the elevational position of the antenna is secured and an antenna support strut, the position of said antenna support strut relative to said mounting collar defining the elevational orientation of the antenna, and wherein said waggle tool is adapted for demountable coupling to said base collar and said antenna support strut for the adjustment of said antenna elevational orientation in a first set position and a stepped waggle movement thereabout.

20. The antenna alignment system set forth in claim 16 wherein said antenna mounting assembly includes a base connector from which the position of the antenna is refined and secured and to an antenna support member, a position of said antenna support member relative to said base connector defining a position of the antenna, and wherein said waggle tool includes a first end adapted for coupling to said antenna support member and a second end adapted for coupling to said base connector, and wherein a distance from said first end to said second end of said waggle tool is selectively variable in linear extent for select movement of the antenna.

21. The antenna alignment system according to claim 20 wherein said waggle tool includes first and second threaded portions coupled together, each being adapted to vary said linear extent of said waggle tool by a select rotation of said threaded portions.

22. The antenna alignment system according to claim 21 wherein rotation of said first threaded portion translates into variations of said linear extent of said waggle tool.

23. The antenna alignment system according to claim 21 wherein waggle actuation of said second threaded portion translates into variation of said linear extent of said waggle tool by rotating said second threaded portion by generally equal amounts in opposite directions for the determination of antenna alignment.

24. The antenna alignment system according to claim 21 wherein said first and second threaded portions are biased relative to an end of said waggle tool for reducing backlash therein relative to the rotation thereof.

25. The antenna alignment system according to claim 24 and further comprising a spring disposed within said waggle tool to provide said biasing.

26. The antenna alignment system according to claim 21 wherein said second threaded portion is adapted for waggle actuation and includes a manually rotatable handle member extending from said waggle tool and coupled to a threaded member rotatably mounted within said waggle tool, said handle being adapted for selectively rotating said threaded member for varying a linear extent of said waggle tool in each direction of rotation.

27. The antenna alignment system according to claim 26 wherein:

said handle member and a first attachment member of said waggle tool are disposed adjacent one another and defining a camming surface therebetween, said camming surface adapted for imparting axial movement to said handle member during the rotation thereof, thereby providing a home position for said handle member with respect to rotation of said handle member relative to said adjacent first attachment member, said camming surface facilitating a manual return of said waggle tool to an original length and said antenna to an original orientation.

28. The antenna alignment system according to claim 21 wherein said second threaded portion is adapted for waggle actuation and includes a motor driven waggle sleeve extending from said waggle tool and coupled to a threaded member rotatably mounted within said waggle tool, said waggle sleeve being adapted for selectively rotating said threaded member for varying a linear extent of said waggle tool in each direction of rotation.

29. The antenna alignment system according to claim 28 wherein:

said motor driven waggle sleeve and a first attachment member of said waggle tool are disposed adjacent one another and defining a camming surface therebetween, said camming surface adapted for imparting axial movement to said motor driven waggle sleeve during the rotation thereof, thereby providing a home position for said handle member with respect to rotation of said motor driven waggle sleeve relative to said adjacent first attachment member, said camming surface facilitating a manual return of said waggle tool to an original length and said antenna to an original orientation

30. A method of aligning an antenna at peak signal strength using an alignment mechanism, comprising the steps of:

affixing an alignment mechanism to an orienting member and to a stationary member on an antenna mounting assembly;

noting a preliminary length of said alignment mechanism;

noting a signal strength at a first antenna orientation;

expanding said alignment mechanism by a select length, thereby changing an orientation of said dish in a first direction;

noting a signal strength at a second antenna orientation;

contracting said alignment mechanism by a select length, thereby changing said orientation of said antenna in a second direction;

noting a signal strength at a third antenna orientation;

returning said alignment mechanism to said preliminary length;

adjusting a length of said alignment mechanism to obtain a new preliminary length;

its repeating said steps of expanding and contracting said alignment mechanism until said preliminary length corresponds to a signal strength that is stronger than said signal strength at said second antenna orientation and said third antenna orientation; and

securing said antenna in a desired orientation.

31. A method for aligning an antenna, comprising:

setting a coarse position of the antenna; and

setting a fine position of the antenna, comprising;

a. waggling the antenna and taking limit signal measurements,

b. adjusting the antenna center position in a direction of a desired signal characteristic obtained from said limit signal measurements; and

c. repeating steps a and b until limit signal measurements indicate that the antenna is positioned for said desired signal characteristic.

32. The method defined by claim 31, including taking center as well as limit signal strength measurements, and centering the antenna position before adjusting the antenna position.

33. Antenna alignment system, comprising:

first means for setting a coarse position of the antenna; and

second means for setting a fine position of the antenna;

comprising;

a) means for waggling the antenna about a center position; and

b) means for selectively adjusting the antenna center position.

34. An antenna alignment mechanism for use with an adjustable antenna mount having a moveable member that is coupled to an antenna and so configured that movement of the moveable member causes the antenna to make an alignment adjustment, an antenna alignment mechanism comprising:

a selectively extensible and contractible operator mechanically coupled to said moveable member such that extension and contraction thereof about a center dimension causes said antenna to waggle about a center position; and

means for selectively incrementing or decrementing the center dimension of said operator to change the center position of the antenna.

35. The antenna alignment mechanism defined by claim 34, wherein said moveable member is a rotatable antenna mount which, when rotated, causes the azimuthal orientation of the antenna to change, and wherein said operator is coupled tangentially to said mount.

36. The antenna alignment mechanism defined by claim 34, wherein said moveable member is a strut structure which, when moved, causes the elevational orientation of the antenna to change, and wherein said operator is coupled to said strut.

37. An antenna alignment system comprising:

a system of moveable members for effecting a coarse alignment of an antenna;

a fine alignment system, comprising;

a) a selectively extensible and contractible operator mechanically coupled to one or more of said moveable members such that extension and contraction of said operator about a center dimension causes said antenna to waggle about a center position; and

b) means for selectively incrementing or decrementing the center dimension of said operator to change the center position of the antenna.

38. The antenna alignment system defined by claim 37, wherein said moveable members include a rotatable antenna mount which, when rotated, causes the azimuthal orientation of the antenna to change, and wherein said operator is coupled tangentially to said mount.

39. The antenna alignment system defined by claim 37, wherein said moveable members includes a strut structure which, when moved, causes the elevational orientation of the antenna to change, and wherein said operator is coupled to said strut.