Shared aperture antenna for independently steered, multiple simultaneous beams

• US 5,128,687 A
• Filed: 05/09/1990
• Issued: 07/07/1992
• Est. Priority Date: 05/09/1990
• Status: Expired due to Term

• Current Assignee: Mitre Corporation
• Original Assignee: Mitre Corporation
• Inventors: Fay, Francis A.
• Primary Examiner(s): Wimer, Michael C.
• Assistant Examiner(s): BROWN, PETER T
• Application Number:
  US07/521,221
• Time in Patent Office: 790 Days
• Field of Search: 343/753, 343/754, 343/853, 342/376, 342/368-375, 333/137, 333/125, 333/136
• US Class Current: 343/754
• CPC Class Codes: H01Q 25/008 lens fed multibeam arrays

Abstract

An antenna including a lens that has an array of radiating elements located on a focal arc, each radiating element corresponding to a different transmission beam direction; and a beam launcher having a plurality of phased arrays and a plurality of internal probes, each of the plurality of internal probes being electrically coupled to a corresponding one of the radiating elements, the phased arrays for space feeding a selected one or more of the radiating elements with signals so as to generate corresponding transmission beams from the lens.

Claims

1. An antenna comprising:

a lens comprising an array of radiating elements located on a focal arc, each radiating element corresponding to a different transmission beam direction; and

a beam launcher comprising a plurality of phased arrays and a plurality of internal probes, each of said plurality of internal probes being electrically coupled to a corresponding one of said radiating elements, each of the phased arrays of said plurality of phased arrays being independently steered and having a corresponding aperture that is internal to the beam launcher wherein each phased array selectively space feeds a corresponding one or more of said internal probes with a different transmit signal through its corresponding aperture so as to generate a plurality of independently steered transmission beam patterns from said lens, the aperture of at least one of said plurality of phased arrays being separate from the apertures of the other of said plurality of phased arrays.

2. The antenna of claim 1 wherein the lens comprises means for limiting orthogonal dispersion of the transmit beam.

3. The antenna of claim 2 wherein the dispersion limiting means comprises two parallel metal plates, said array of radiating elements being located between said metal plates.

4. The antenna of claim 1 wherein the lens is a Ruze lens.

5. The antenna of claim 1 wherein the lens is a Rotman lens.

6. The antenna of claim 1 wherein the focal arc is a circular arc.

7. The antenna of claim 6 wherein the internal probes are arrayed along a curve having a radius R.

8. The antenna of claim 1 wherein at least one of said plurality of phased arrays is a focused phased array comprising a plurality of phased array radiating probes.

9. The antenna of claim 8 wherein the beam launcher further comprises two parallel metal plates, said phased array radiating probes an said plurality of internal probes being located between said metal plates.

10. The antenna of claim 1 further comprising a receiver circuit for receiving received signals from at least some of said lens radiating elements.

11. The antenna of claim 10 wherein the receiver circuit comprises a receiver horn.

12. The antenna of claim 11 wherein the receiver horn comprises a flared waveguide having a narrow end and a wide end opposed to the narrow end, the receiver horn further comprising an array of internal probes located at the wide end and a receive probe located at the narrow end.

13. The antenna of claim 12 wherein the array of internal probes in said horn is arrayed along a curve having a radius R.

14. The antenna of claim 10 wherein the receiver circuit comprises a signal bus and a matrix of switches for electrically coupling selected elements of the array of radiating elements to said signal bus.

15. The antenna of claim 10 further comprising a plurality of circulators for directing transmission energy from the plurality of internal probes to the array of radiating elements and for directing received energy from the array of radiating elements to the receiver circuit.

16. The antenna of claim 1 further comprising a plurality of transmitters, each of said transmitters coupled to and driving a different one of said plurality of phased arrays with a different transmit signal.

17. An antenna comprising:

a primary lens comprising an array of radiating elements located on a focal arc, each radiating element corresponding to a different transmission beam direction;

a beam launcher comprising a plurality of phased arrays and a plurality of internal probes, each of said plurality of internal probes being electrically coupled to a corresponding one of said radiating elements, each of the phased arrays of said plurality of phased arrays being independently steered and selectively space feeding a corresponding one or more of said internal probes with a different transmit signal so as to generate a plurality of independently steered transmission beam patterns from said primary lens; and

a receiver circuit for receiving received signals from at least some of said array of radiating elements, said receiver circuit comprising a receiver lens electrically coupled to said array of radiating elements, said receiver circuit being separate and distinct from said beam launcher.

18. The antenna of claim 17 wherein the primary lens comprises means for limiting orthogonal dispersion of the transmit beam.

19. The antenna of claim 18 wherein the dispersion limiting means comprises two parallel metal plates, said array of radiating elements being located between said metal plates.

20. The antenna of claim 17 wherein the primary lens is a Ruze lens.

21. The antenna of claim 17 wherein the primary lens is a Rotman lens.

22. The antenna of claim 17 wherein the focal arc is a circular arc.

23. The antenna of claim 22 wherein the internal probes are arrayed along curve having a radius R.

24. The antenna of claim 17 wherein at least one of said plurality of phased arrays is a focused phased array comprising a plurality of phased array radiating probes.

25. The antenna of claim 24 wherein the beam launcher further comprises two parallel metal plates, said phased array radiating probes and said plurality of internal probes being located between said metal plates.

26. The antenna of claim 17 wherein the receiver lens comprises a horn.

27. The antenna of claim 26 wherein the horn comprises a flared waveguide having a narrow end and a large end opposed to the narrow end, the horn further comprising an array of internal probes located at the wide end and a receive probe located at the narrow end.

28. The antenna of claim 27 wherein the array of internal probes in said horn is arrayed along a curve having a radius of R.

29. The antenna of claim 17 wherein the receiver circuit comprises a signal bus and a matrix of switches for electrically coupling selected elements of the array of lens radiating elements to said signal bus.

30. The antenna of claim 17 further comprising a plurality of circulators for directing transmission energy from the plurality of internal probes to the array of radiating elements and for directing received energy from the array of radiating elements to the receiver lens.

31. An antenna comprising:

a lens comprising an array of radiating elements located on a focal arc, each radiating element corresponding to a different transmission beam direction; and

a beam launcher comprising at least a first and a second phased array and a plurality of internal probes, each of said plurality of internal probes being electrically coupled to a corresponding one of said radiating elements, said first phased array for selectively space feeding one or more of said internal probes with a first signal so as to generate a corresponding first transmission beam pattern from said lens, said second phased array for selectively space feeding one or more of said internal probes with a second signal so as to generate a corresponding second transmission beam pattern from said lens, wherein said first and second phased arrays are independently steered and said first and second transmission beam patterns are independently steered and wherein said first and second signals have the same carrier frequency.

32. The antenna of claim 31 wherein the lens comprises means for limiting orthogonal dispersion of the transmit beam.

33. The antenna of claim 32 wherein the dispersion limiting means comprises two parallel metal plates, said array of radiating elements being located between said metal plates.

34. The antenna of claim 31 wherein the lens is a Ruze lens.

35. The antenna of claim 31 wherein the lens is a Rotman lens.

36. The antenna of claim 31 wherein at least one of the first and second phased arrays is a focused phased array comprising a plurality of phased array radiating probes.

37. The antenna of claim 36 wherein the beam launcher further comprises two parallel metal plates, said phased array radiating probes and said array of internal probes being located between said metal plates.