Indirect radiating array techniques

• US 6,404,398 B1
• Filed: 08/17/2000
• Issued: 06/11/2002
• Est. Priority Date: 08/17/2000
• Status: Expired due to Fees

• Current Assignee: Northrop Grumman Corporation
• Original Assignee: TRW Inc. (Northrop Grumman Corporation)
• Inventors: Koretzky, Edward V., Kuo, Steven S., Chen, Chun-Hong H., Brundrett, David L.
• Primary Examiner(s): Wimer, Michael C.
• Application Number:
  US09/640,450
• Time in Patent Office: 663 Days
• Field of Search: H01/Q 1.500, H01/Q 1.502, H01/Q.326, H01/Q 1.523, H01/Q 1.906, H01/Q 1.908, H01/Q 1.910, 343/753, 343/754, 343/755, 343/781.CA, 343/781.P, 342/368, 342/374
• US Class Current: 343/754
• CPC Class Codes: H01Q 1/288 Satellite antennas
• CPC Class Codes: H01Q 25/007 using two or more primary active elements in the focal region of a focusing device for operation on different wavebands H01Q5/22
• CPC Class Codes: H01Q 25/008 lens fed multibeam arrays
• CPC Class Codes: H01Q 3/26 varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture H01Q3/12, H01Q3/22, H01Q3/24 take precedence
• CPC Class Codes: H01Q 3/40 with phasing matrix

Abstract

An antenna system and method for transmitting or receiving a plurality of pixel beams of satellite communication signals. A focusing device (770) focuses pixel beams on individual antenna elements or horns (708 or 808) of the transmitter (700) or receiver (800). In the transmitter, each antenna element transmits a pixel beam, and in the receiver, each antenna element has focused on it an individual pixel beam.

Claims

1. An antenna system for transmitting or receiving a plurality of pixel beams of satellite communication signals, including a first pixel beam and a second pixel beam, said system comprising in combination;

a plurality of antenna array elements conducting element signals corresponding to said plurality of pixel beams, said antenna array elements including a first element and a second element;

a focusing device arranged to couple individual pixel beams of said plurality of pixel beams to individual elements of said plurality of antenna array elements, including coupling said first pixel beam to said first array element and said second pixel beam to said second array element; and

a processing module coupled to said element signals, said processing module including variable amplitude and phase devices to coordinate the pixel beams with a desired direction.

2. A system, as claimed in claim 1, wherein said focusing device comprises a reflector.

3. A system, as claimed in claim 2, wherein said focusing device comprises a plurality of reflectors.

4. A system, as claimed in claim 2, wherein said focusing device comprises a Side-fed offset Cassegrain device.

5. A system, as claimed in claim 1, wherein said focusing device comprises a lens.

6. A system, as claimed in claim 5, wherein said focusing device comprises a reflector coupled between said lens and said antenna array elements.

7. A system, as claimed in claim 1, wherein said array elements are arranged to generate said pixel beams from said element signals, wherein said focusing device is arranged to transmit said pixel beams into space and wherein said variable amplitude and phase devices provide a steering capability.

8. A system, as claimed in claim 7, wherein said processing module generates said element signals from communication signals.

9. A system, as claimed in claim 1, wherein said array elements are arranged to generate said element signals from said pixel beams received from said focusing device.

10. A system, as claimed in claim 9, wherein said processing module generates communication signals from said element signals.

11. A system, as claimed in claim 1, wherein said antenna array elements comprise a plurality of horns.

12. A system, as claimed in claim 1, wherein said focusing device comprises a plurality of lenses.

13. In an antenna system for transmitting or receiving a plurality of pixel beams of satellite communication signals, including a first pixel beam and a second pixel beam, by using a plurality of antenna array elements, including a first element and a second element, a method comprising focusing individual pixel beams of said plurality of pixel beams relative to individual elements of said plurality of antenna array elements, including focusing said first pixel beam relative to said first element and focusing said second pixel beam relative to said second element, and generating amplitude and phase adjustment signals to coordinate the pixel beams with a desired direction.

14. A method, as claimed in claim 13, wherein said focusing comprises reflecting.

15. A method, as claimed in claim 13, wherein said system comprises a lens and wherein said focusing comprises focusing with said lens.

16. A method, as claimed in claim 15, wherein said focusing further comprises reflecting.

17. A method, as claimed in claim 13, wherein said system is arranged as a receiver and wherein said method further comprises:

generating element signals corresponding to said pixel beams; and

processing said element signals to generate communication signals.

18. A method, as claimed in claim 13, wherein said system is arranged as a transmitter and wherein said method further comprises:

receiving composite beam signals;

processing said composite beam signals to form element signals; and

transmitting said pixel beams in response to said element signals and said amplitude and phase adjustment signals to provide a steering capability.