Low-profile lens method and apparatus for mechanical steering of aperture antennas

• US 20070285327A1
• Filed: 06/13/2006
• Published: 12/13/2007
• Est. Priority Date: 06/13/2006
• Status: Active Grant

• Current Assignee: BAE Systems Space & Mission Systems Incorporated (BAE Systems Plc)
• Original Assignee: Ball Aerospace & Technologies Corporation (Ball Corporation)
• Inventors: Kerby, Kiersten Carinne, Paschen, Dean Alan
• Granted Patent: US 7,656,345 B2
• Time in Patent Office: Days
• US Class Current: 343/754
• CPC Class Codes: H01Q 19/062 for focusing
• CPC Class Codes: H01Q 19/08 for modifying the radiation pattern of a radiating horn in which it is located corrugated horns H01Q13/0208; producing a circular polarisation H01Q13/0241
• CPC Class Codes: H01Q 3/04 for varying one co-ordinate of the orientation
• CPC Class Codes: H01Q 3/14 for varying the relative position of primary active element and a refracting or diffracting device

Abstract

A low-profile lens element for steering a beam is provided. Specifically, the low-profile lens element is mechanically rotatable such that a beam can be steered in any direction within three-dimensional space. The lens element may include a number of discrete portions for differentially delaying adjacent discrete portions of a beam in order to effect beam steering.

Claims

1. A method of directing a beam, comprising:

receiving a beam having a first direction of travel at a first rotatable lens element;

delaying a first discrete portion of the beam by a first amount; and

delaying of a second discrete portion of the beam by a second amount, wherein the second amount is different from the first amount.

2. The method of claim 1, further comprising:

passing the beam from the first rotatable lens element to a second rotatable lens element;

delaying a third discrete portion of the beam by a third amount; and

delaying a fourth discrete portion of the beam by a fourth amount, wherein the fourth amount is different from the third amount, in order to alter the direction of travel of the beam.

3. The method of claim 2, further comprising rotating the first lens element relative to the second lens element.

4. The method of claim 1, wherein the first amount of delaying is equal to a first portion of wavelength of the beam, wherein the second amount of delaying is equal to a second portion of wavelength of the beam, and wherein the first and second portions are different.

5. The method of claim 1, wherein the first lens element comprises a stepped dielectric, wherein the first discrete portion of the first lens element has a first thickness and the second discrete portion of the first lens element has a second thickness, and wherein the second thickness is different from the first thickness, further comprising:

receiving the first portion of the beam at the first discrete portion of the lens element;

transmitting the first portion of the beam through the stepped dielectric having a first thickness;

receiving the second portion of the beam at the second discrete portion of the lens element; and

transmitting the second portion of the beam through the stepped dielectric having a second thickness.

6. The method of claim 1, wherein the first lens element comprises back-to-back radiating elements, wherein the back-to-back radiating elements are separated by a ground plane, wherein the first portion comprises a first radiating element and a second radiating element connected by a first transmission line, and wherein the second portion comprises a third radiating element and a fourth radiating element connected by a second transmission line.

7. The method of claim 6, further comprising:

receiving the first discrete portion of the beam at the first radiating element;

transmitting energy derived from the first discrete portion of the beam from the first radiating element to the second radiating element via the first transmission line;

receiving the second discrete portion of the beam at the third radiating element; and

transmitting energy derived from the second discrete portion of the beam from the third radiating element to the fourth radiating element via the second transmission line.

8. The method of claim 6, wherein the first transmission line is of a first length and wherein the second transmission line is of a second length that differs from the first length.

9. The method of claim 6, wherein the back-to-back radiating elements comprise spiral radiating elements, wherein the first radiating element is rotated relative to the second radiating element by a first amount, and wherein the third radiating element is rotated relative to the fourth radiating element by a second amount that differs from the first amount.

10. The method of claim 1, further comprising rotating a transceiver relative to the first lens element.

11. The method of claim 1, further comprising:

receiving the transmitted beam at a transceiver;

adjusting the phase of the received beam with a phase shifter; and

combining the adjusted beam with a beam from another antenna assembly.

12. The method of claim 1, further comprising:

partitioning the first lens element into four discrete portions, each of the four discrete portions of the first lens element receiving a portion of the beam, the first discrete portion of the beam being incident upon a first discrete portion of the first lens element, the second discrete portion of the beam being incident upon a second discrete portion of the first lens element, a third discrete portion of the beam being incident upon a third discrete portion of the first lens element, and a fourth discrete portion of the beam being incident upon a fourth discrete portion of the first lens element;

changing the phase of the first discrete portion of the beam by a first fraction of the beam'"'"'s wavelength;

changing the phase of the second discrete portion of the beam by a second fraction of the beam'"'"'s wavelength;

changing the phase of the third discrete portion of the beam by a third fraction of the beam'"'"'s wavelength; and

changing the phase of the fourth discrete portion of the beam by a fourth fraction of the beam'"'"'s wavelength.

13. A beam steering device, comprising:

a first rotatable lens element, comprising;

at least a first area operable to receive a first discrete portion of a beam traveling in a first direction and further operable to delay the first portion of the beam by a first amount and then transmit the first portion of the beam; and

at least a second area operable to receive a second discrete portion of the beam and further operable to delay the second portion of the beam by a second amount and then transmit the second section of the beam; and

wherein the first amount of phase change is different from the second amount of phase change.

14. The device of claim 13, further comprising a rotation member operable to rotate the first lens about an axis of rotation.

15. The device of claim 13, wherein the first lens element further comprises a stepped dielectric, wherein the first portion has a first thickness, and wherein the second portion has a second thickness that is different from the first thickness.

16. The device of claim 13, wherein the first lens element further comprises back-to-back radiating elements separated by a ground plane, wherein the first discrete portion of the first lens element comprises a first radiating element, a second radiating element, and a first transmission line connecting the first radiating element and the second radiating element, wherein the second discrete portion comprises a third radiating element, a fourth radiating element, and a second transmission line connecting the third radiating element and the fourth radiating element.

17. The device of claim 16, wherein the lengths of the first and second transmission lines are different.

18. The device of claim 16, wherein the back-to-back radiating elements comprise circularly polarized radiating elements, wherein the first radiating element is rotated relative to the second radiating element by a first amount, and wherein the third radiating element is rotated relative to the fourth radiating element by a second amount that is different from the first amount.

19. The device of claim 13, further comprising a second rotatable lens element comprising a first area and a second area, wherein the first area of the second lens element is operable to receive a first discrete portion of the beam transmitted by the first rotatable lens element and further operable to delay the first portion of the beam traveling in the second direction by a first amount and then transmit the first portion of the beam, wherein the second area of the second lens element is operable to receive a second discrete portion of the beam transmitted by the first rotatable lens element and further operable to delay the second portion of the beam traveling in the second direction by a second amount.

20. The device of claim 19, wherein the first lens element is operable to be rotated relative to the second lens element.

21. The device of claim 13, wherein the beam is of any polarization.

22. The device of claim 13, wherein the beam is dual orthogonal polarized.

23. The device of claim 13, further comprising a pre-steered antenna aperture.

24. A beam steering device, comprising:

a first means for altering a direction of travel of a radio frequency beam having a first side and a second side and including;

means for delaying a portion of the beam received at a first area of the first side by a first amount; and

means for delaying a portion of the beam received at a second area of the first side by a second amount, wherein the first and second amounts are different.

25. The device of claim 24, wherein the first amount of delay results in a phase change that is a first fraction of the beam'"'"'s wavelength and the second amount of delay results in a phase change that is a second fraction of the beam'"'"'s wavelength.

26. The device of claim 24, wherein the means for altering comprises a stepped dielectric, wherein the means for delaying a portion of the beam received at the first area has a first thickness, and wherein the means for delaying a portion of the beam received at a second area has a second thickness that is different from the first thickness.

27. The device of claim 24, wherein the means for delaying a portion of the beam received at a first area comprises:

a first means for receiving;

a first means for transmitting; and

a first means for connecting the first means for receiving and transmitting;

wherein the means for delaying a portion of the beam received at a second area comprises;

a second means for receiving;

a second means for transmitting; and

a second means for connecting the second means for receiving and transmitting; and

wherein the first and second means for connection have different lengths.