Light-weight modular low-level reconfigurable beamformer for array antennas

• US 6,246,364 B1
• Filed: 06/18/1999
• Issued: 06/12/2001
• Est. Priority Date: 06/18/1999
• Status: Expired due to Term

• Current Assignee: Hughes Electronics Corporation (AT&T, Inc.)
• Original Assignee: Hughes Electronics Corporation (AT&T, Inc.)
• Inventors: Gulick, Jon J., Rao, Sudhakar K., Wu, Shih-Chang
• Primary Examiner(s): Pihulic, Daniel T.
• Application Number:
  US09/336,224
• Time in Patent Office: 725 Days
• Field of Search: 342/368, 342/372, 342/373, 342/374
• US Class Current: 342/368
• CPC Class Codes: H01Q 1/288 Satellite antennas
• CPC Class Codes: H01Q 21/061 Two dimensional planar arrays
• CPC Class Codes: H01Q 21/22 Antenna units of the array energised non-uniformly in amplitude or phase, e.g. tapered array or binomial array
• 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

A method and apparatus for forming satellite transmission beams are disclosed. A beamforming network in accordance with the present invention comprises an array of antennas and primary and secondary dividing networks. The array of antennas comprises at least a first subarray having a first number of elements and a second subarray having a second number of elements. The primary dividing network divides a beam signal into a plurality of panel signals, wherein a number of panel signals is substantially equal to a number of subarrays. The secondary dividing network divides a first panel signal into a first plurality of element signals substantially equal in number to the first number of elements and for dividing a second panel signal into a second plurality of element signals substantially equal in number to the second number of elements.

Claims

1. A beamforming network, comprising:

an array of antennas, comprising at least a first subarray having a first number of elements and a second subarray having a second number of elements;

a primary dividing network for dividing a beam signal into a plurality of panel signals, wherein a number of panel signals is substantially equal to a number of subarrays; and

a secondary dividing network, coupled to the primary dividing network, for dividing a first panel signal into a first plurality of element signals substantially equal in number to the first number of elements and for dividing a second panel signal into a second plurality of element signals substantially equal in number to the second number of elements;

wherein the element signals are amplified.

2. The beamforming network of claim 1, wherein the first number of elements and the second number of elements are equal.

3. The beamforming network of claim 1, wherein the primary dividing network includes redundant paths through the primary dividing network.

4. The beamforming network of claim 1, wherein the primary dividing network receives multiple beam signals.

5. The beamforming network of claim 1, wherein the secondary dividing network comprises modules.

6. The beamforming network of claim 1, further comprising a transmitter for transmitting the element signals.

7. A method for forming a first beam and a second beam from an array of antennas, wherein the array of antennas comprises a first subarray having a first number of antenna elements and a second subarray having a second number of antenna elements, comprising the steps of:

dividing a beam signal into a plurality of panel signals, wherein a number of panel signals is substantially equal to a number of subarrays;

dividing a first panel signal into a first plurality of element signals substantially equal in number to the first number of antenna elements and for dividing a second panel signal into a second plurality of element signals substantially equal in number to the second number of antenna elements; and

amplifying the element signals.

8. The method of claim 7, wherein the first number of antenna elements and the second number of antenna elements are substantially equal.

9. The method of claim 7, wherein the step of dividing the input signals comprises the step of providing redundant paths through a primary dividing network.

10. A beamforming network for forming a desired number of beams to be transmitted by a satellite, comprising:

a primary dividing network for dividing a beam signal into a plurality of panel signals, wherein a number of panel signals is substantially equal to the desired number of beams; and

a secondary dividing network, coupled to the primary dividing network, for dividing the plurality of panel signals into groups of element signals, wherein each group of element signals is used to form one of the desired beams;

wherein the element signals are amplified.

11. The beamforming network of claim 10, wherein a number of divided signals in each group of divided are substantially equal.

12. The beamforming network of claim 10, where the primary dividing network includes redundant paths through the primary dividing network.

13. The beamforming network of claim 10, wherein the primary dividing network receives multiple beam signals.

14. The beamforming network of claim 10, wherein the secondary dividing network comprises modules.

15. A signal, to be transmitted by an array of antennas, wherein the array of antennas comprises at least a first subarray having a first number of elements and a second subarray having a second number of elements formed by performing the steps of:

dividing a beam signal into a plurality of panel signals, wherein a number of panel signals is substantially equal to a number of subarrays;

dividing a first panel signal into a first plurality of element signals substantially equal in number to the first number of elements and for dividing a second panel signal into a second plurality of element signals substantially equal in number to the second number of elements;

amplifying the element signals; and

transmitting the first plurality of element signals from the first subarray and the second plurality of element signals from the second subarray for forming the signal.