Steerable antenna system

• US 5,982,333 A
• Filed: 08/03/1997
• Issued: 11/09/1999
• Est. Priority Date: 09/03/1997
• Status: Expired due to Term

• Current Assignee: Omnitracs LLC (Solera Holdings Incorporated)
• Original Assignee: Qualcomm, Inc.
• Inventors: Benacka, Thomas J., Stillinger, David C.
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): Malos, Jennifer H.
• Application Number:
  US08/922,719
• Time in Patent Office: 828 Days
• Field of Search: 343/766, 343/757, 343/763, 343/765, 343/882, 343/713, 342/359
• US Class Current: 343/766
• CPC Class Codes: H01Q 1/3275 mounted on a horizontal surface of the vehicle, e.g. on roof, hood, trunk
• CPC Class Codes: H01Q 3/08 for varying two co-ordinates of the orientation

Abstract

A steerable antenna system for adjusting the elevation of an antenna for communication with a central facility via a satellite. The steerable antenna system includes a motor, a spindle drivingly engaged to the motor, and a chassis fixedly disposed on the spindle. The chassis has a stop disposed about its periphery. A first waveguide is fixedly disposed on the chassis and a second waveguide is disposed on an antenna. A ring cam is mounted on the chassis, and a grooved is formed in the ring cam. A first portion of a lever arm is pivotally mounted on the chassis and a second portion of the lever arm is disposed in the groove of the ring cam. An antenna is hingedly mounted on the chassis and to the lever arm. A solenoid, disposed on a base of the steerable antenna system, is configured to engage a portion of the ring cam. In use, when the solenoid is activated, power from the motor is used to adjust the elevation of the antenna. When the solenoid is deactivated, power from the motor is used to adjust the azimuth of the antenna to acquire a satellite.

Claims

1. A steerable antenna system, comprising:

a motor;

a spindle drivingly engaged to said motor;

a chassis fixedly disposed on said spindle, said chassis having a stop disposed about a periphery thereof;

a ring cam, disposed on said chassis and having at least one groove formed therein;

a lever arm, wherein a first portion of said lever arm is disposed in said groove of said ring cam and a second portion of said lever arm is pivotally mounted on said chassis;

an antenna hingedly mounted on said lever arm; and

a solenoid disposed on a base portion of said steerable antenna system and configured to engage a portion of said ring cam, wherein, when said solenoid is activated, said motor adjusts the elevation of said antenna, and wherein, when said solenoid is deactivated, said motor adjusts the azimuth of said antenna to acquire a signal from a desired signal source.

2. The steerable antenna system of claim 1, wherein said desired signal source comprises a moving source.

3. The steerable antenna system of claim 2, wherein said moving source comprises a satellite.

4. The steerable antenna system of claim 1, wherein said desired signal source comprises a terrestrial repeater.

5. The steerable antenna system of claim 1, wherein said motor comprises a stepper motor.

6. The steerable antenna system of claim 1, further comprising:

a belt drivingly engaging said spindle and said motor; and

at least one sprocket disposed about a periphery of said chassis for frictionally engaging a portion of said belt.

7. The steerable antenna system of claim 1, wherein said ring cam has a first half portion and a second half portion.

8. The steerable antenna system of claim 1, wherein said ring cam has a detent formed at either end of said groove.

9. The steerable antenna system of claim 1, wherein said lever arm has a displacement angle less than or equal to 40 degrees.

10. The steerable antenna system of claim 1, wherein said antenna comprises:

a first half housing;

a second half housing having a plurality of bosses integrally mounted on one side of said second half housing;

a printed circuit board having a distribution feed network formed thereon, disposed between said first half housing and said second half housing; and

a helix disposed in each of said plurality of bosses on said second half housing.

11. The steerable antenna system of claim 1, wherein said motor has a rotating shaft, and wherein said spindle is drivingly engaged to said rotating shaft.

12. The steerable antenna system of claim 1, further comprising:

a waveguide disposed on said chassis; and

a first probe fixedly disposed in the center of said spindle and extending upwardly through a hole formed in said waveguide.

13. The steerable antenna system of claim 12, further comprising a second probe fixedly disposed in a set of corresponding holes formed in said waveguide and said chassis and extending into a second waveguide affixed to said antenna.

14. The steerable antenna system of claim 1, wherein said chassis has two stops disposed about a periphery thereof.

15. The steerable antenna system of claim 1, wherein said antenna is alternately adjustable to first and second elevations.

16. The steerable antenna system of claim 1, wherein said antenna is alternately adjustable to first, second and third elevations.

17. The steerable antenna system of claim 1, wherein an antenna feed of said antenna comprises metal plated polycarbonate.

18. A steerable antenna system, comprising:

a motor;

a spindle drivingly engaged to said motor;

a chassis fixedly disposed on said spindle;

a cam, disposed on said chassis and having at least one groove formed therein;

a lever arm, wherein a first portion of said lever arm is disposed in said groove of said cam and a second portion of said lever arm is pivotally mounted on said chassis;

an antenna hingedly mounted on said lever arm; and

a solenoid disposed on a base portion of said steerable antenna system and configured to engage said cam, wherein, when said solenoid is activated, said motor adjusts the elevation of said antenna, and wherein, when said solenoid is deactivated, said motor adjusts the azimuth of said antenna to acquire a signal from a desired signal source.

19. The steerable antenna system of claim 18, wherein said desired signal source is a moving source.

20. The steerable antenna system of claim 19, wherein said moving signal source is a satellite.

21. The steerable antenna system of claim 18, wherein said desired signal source is a terrestrial repeater.

22. The steerable antenna system of claim 18, wherein said chassis has a stop disposed about a periphery thereof.

23. The steerable antenna system of claim 18, further comprising a first waveguide fixedly disposed on said chassis.

24. The steerable antenna system of claim 23, further comprising a second waveguide disposed on said antenna.

25. The steerable antenna system of claim 18, wherein said cam is a ring cam.

26. A steerable antenna system, comprising:

a chassis rotatingly connected to a motor;

a cam disposed on said chassis, said cam having at least one groove formed therein;

a lever arm having a first portion mounted in said groove of said cam and a second portion pivotally mounted on said chassis, and wherein said lever arm is configured to support an antenna; and

a solenoid, disposed on said steerable antenna system, wherein rotation of said chassis while said solenoid is activated causes an adjustment in elevation of said antenna and wherein rotation of said chassis while said solenoid is deactivated causes an adjustment in azimuth of said antenna.

27. A method for adjusting an antenna, comprising the steps of:

(a) signaling a motor of said antenna to stop acquisition of a signal from a desired signal source;

(b) activating a solenoid;

(c) activating said motor to rotate a chassis of an assembly between 270° and

360°

so that rotation of said chassis is translated into adjustment of the elevation of said antenna;

(d) deactivating said solenoid; and

(e) using said motor to rotate said antenna so that said desired source signal can be reacquired.

28. The method of claim 27, wherein reacquiring said desired signal source comprises the step of acquiring a moving source.

29. The method of claim 28, wherein the step of acquiring a moving source comprises the step of acquiring a satellite.

30. The method of claim 27, wherein reacquiring said desired signal source comprises the step of acquiring a terrestrial repeater.

31. The method of claim 27, wherein actuation of said solenoid occurs automatically when said antenna passes through a predetermined latitude.

32. The method of claim 27, wherein said antenna can be adjusted between a first elevation and a second elevation.

33. The method of claim 27, wherein said antenna can be adjusted between a first elevation, a second elevation, and a third elevation.

34. The method of claim 27, wherein said step (e) further comprises:

(i) rotating said antenna in a series of 360°

arcs until said signal is detected;

(ii) determining a direction of a highest signal strength of said signal; and

(iii) tracking said direction of highest signal strength relative to a position or movement of a vehicle on which said antenna is mounted.