Shared phased array cluster beamformer

• US 7,511,666 B2
• Filed: 02/24/2006
• Issued: 03/31/2009
• Est. Priority Date: 04/29/2005
• Status: Active Grant

• Current Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Original Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Inventors: Lam, Lawrence K., Jacomb-Hood, Anthony W.
• Primary Examiner(s): PHAN, DAO LINDA
• Application Number:
  US11/360,532
• Publication Number:
  US 20090009392A1
• Time in Patent Office: 1,131 Days
• Field of Search: 342/81, 342/157, 342/368, 342372-374, 455/276.1, 455/277.1
• US Class Current: 342/374
• CPC Class Codes: H01Q 1/288 Satellite antennas
• CPC Class Codes: H01Q 25/00 Antennas or antenna systems providing at least two radiating patterns arrangements for changing or varying the orientation or the shape of the directional pattern H01Q3/00
• CPC Class Codes: H01Q 3/24 varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
• CPC Class Codes: H01Q 3/30 varying the relative phase between the radiating elements of an array H01Q3/2605, H01Q3/2658, H01Q3/2682, H01Q3/44 take precedence
• CPC Class Codes: H04B 7/18515 Transmission equipment in satellites or space-based relays

Abstract

A shared beamformer flexibly allocates beams among clusters of beams produced by phased array antenna apertures that are deployed on a satellite (or other type of platform). By sharing the beamformer among the beam clusters, if one beam cluster is not providing useful coverage, the beams may be reallocated to one or more other beam clusters that are providing useful coverage. To share the beamformer among the beam clusters, a selector network is used to select which particular beam cluster (or clusters) is used for producing one or more narrow beams that are constrained to the coverage area of the beam cluster (or clusters).

Claims

1. A phased array antenna system, comprising:

a first beamformer configured to produce one or more first antenna beams from at least two electromagnetic signals that are respectively received by at least two phased array antenna elements; and

a selector configured to select the one or more first antenna beams to output to a second beamformer that is configured to produce one or more second antenna beams, wherein coverage provided by the one or more second antenna beams is at least partially constrained by the coverage provided by the one or more first antenna beams.

2. The phased array antenna system of claim 1, wherein the pointing direction of the one or more second antenna beams is partially constrained by the beamwidth of the one or more first antenna beams.

3. The phased array antenna system of claim 1, wherein the one or more first antenna beams has a larger beamwidth than the one or more second antenna beams.

4. The phased array antenna system of claim 1, wherein the phased array antenna elements are included in the same phased array aperture.

5. The phased array antenna system of claim 1, wherein the phased array antenna elements are included in different phased array apertures.

6. The phased array antenna system of claim 1, wherein the first beamformer includes a phase shifter configured to adjust the phase of a signal associated with at least one of the received signals.

7. The phased array antenna system of claim 1, wherein the first beamformer includes an attenuator configured to attenuate a signal associated with at least one of the received signals.

8. The phased array antenna system of claim 1, wherein the selector includes a switch.

9. The phased array antenna system of claim 1, wherein the selector includes a two-way switch.

10. The phased array antenna system of claim 1, wherein the selector includes a semiconductor switch.

11. The phased array antenna system of claim 1, wherein the selector includes a mechanical switch.

12. The phased array antenna system of claim 1, wherein the selector includes a ferrite switch.

13. The phased array antenna system of claim 1, wherein the selector includes an optical switch.

14. The phased array antenna system of claim 1, wherein the selector includes a digital switch.

15. The phased array antenna system of claim 1, wherein the selector executes instructions to provide the one or more first antenna beams to the second beamformer.

16. The phased array antenna system of claim 1, wherein the first beamformer, the selector, and the second beamformer are included in an integrated package.

17. A phased array antenna system comprising a plurality of sets of antenna elements configured to transmit, receive, or both, a set of signals, the phased array antenna system comprising:

a first set of antenna elements associated with a first aperture and coupled to a first beamforming stage configured to produce one or more first antenna beams;

a second set of antenna elements associated with a second aperture and coupled to a second beamforming stage configured to produce one or more second antenna beams;

a selector coupled to the first beamforming stage and the second beamforming stage and configured to allocate antenna beams from the one or more first antenna beams and the one or more second antenna beams to a third beamforming stage; and

the third beamforming stage configured to generate at least one or more third antenna beams, wherein coverage provided by the one or more third antenna beams is at least partially constrained by the coverage provided by the one or more first antenna beams, or by the one or more second antenna beams or both.

18. The phased array antenna system of claim 17, wherein the pointing direction of the one or more third antenna beams is partially constrained by the beamwidth of the one or more first antenna beams, or the one or more second antenna beams or both.

19. The phased array antenna system of claim 17, wherein at least one of the one or more first antenna beams and the one or more second antenna beams has a larger beamwidth than the one or more third antenna beams.

20. The phased array antenna system of claim 17, wherein the phased array antenna elements are included in the same phased array aperture.

21. The phased array antenna system of claim 17, wherein the phased array antenna elements are included in different phased array apertures.

22. The phased array system of claim 17, wherein the selector includes at least one switch.

23. A method of producing electromagnetic beams, comprising:

receiving electromagnetic signals from a first and second phased array antenna element;

beamforming the electromagnetic signals to produce one or more first antenna beams; and

selecting to beamform the one or more first antenna beams to produce one or more second antenna beams, wherein coverage provided by the one or more second antenna beams is at least partially constrained by the coverage provided by the one or more first antenna beams.

24. The method of claim 23, further including:

beamforming at least the one or more first antenna beams to produce the one or more second antenna beams.

25. A method of producing electromagnetic beams, comprising:

receiving electromagnetic signals from a first and second phased array antenna element;

beamforming the electromagnetic signals to produce one or more first antenna beams;

beamforming the one or more first antenna beams to produce one or more second antenna beams, wherein coverage provided by the one or more second antenna beams is at least partially constrained by the coverage provided by the one or more first antenna beams; and

selecting the one or more first antenna beams from other produced beams.

26. The method of claim 25, further comprising:

constraining the selecting of produced beams to a particular number of beams.

27. A method of receiving, transmitting, or both, electromagnetic beams in a phased array antenna comprising a plurality of sets of antenna elements configured to transmit, receive, or both, a set of signals, the method comprising:

generating one or more first antenna beams from a first beamforming stage configured for coupling to a first set of antenna elements and a second set of antenna elements;

allocating by a selector the one or more first antenna beams to inputs of a second beamforming stage; and

generating one or more second antenna beams from the second beamforming stage, wherein coverage provided by the one or more second antenna beams is at least partially constrained by the coverage provided by the one or more first antenna beams.

28. A phased array antenna system comprising a plurality of sets of antenna elements configured to transmit, receive, or both, a set of signals, the phased array antenna system comprising:

a first set of antenna elements associated with a first aperture and coupled to a first beamformer configured to produce one or more first antenna beams;

a first selector coupled to the first beamformer and coupled to a second beamformer, the second beamformer configured to produce one or more second antenna beams that is partially constrained by the one or more first antenna beams;

a second set of antenna elements associated with a second aperture and coupled to a third beamformer configured to produce one or more third antenna beams;

a second selector coupled to the third beamformer and coupled to a fourth beamformer, the fourth beamformer configured to produce one or more fourth antenna beams that are partially constrained by the one or more third antenna beams;

a final selector coupled to the second beamformer and the fourth beamformer and configured to allocate antenna beams from the one or more second antenna beams and the one or more fourth antenna beams; and

a final beamforming stage coupled to the final selector and configured to generate one or more final antenna beams, wherein coverage provided by the one or more final antenna beams is at least partially constrained by the coverage provided by the one or more second antenna beams, or by the one or more fourth antenna beams or both.

29. A phased array antenna comprising a plurality of sets of antenna elements configured to transmit, receive, or both, a set of signals, the phased array antenna comprising:

a plurality of beamformers and at least one selector configured to couple to a first set of radiating elements and a second set of radiating elements to generate one or more first antenna beams and to generate there from one or more second antenna beams, wherein coverage provided by the one or more second antenna beams is at least partially constrained by the coverage provided by the one or more first antenna beams.