Reconfigurable zonal beam forming system for an antenna on a sat

Details Reconfigurable zonal beam forming system for an antenna on a sat Reconfigurable zonal beam forming system for an antenna on a sat

1997-06-24

1999-07-27

Issing, Gregory C.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

342373, 455 133, H04B 7185

Patent

active

059298049

ABSTRACT:
A reconfigurable zonal beam forming system for an antenna on a satellite in orbit includes, in cascade, a signal splitter applying signals of equal amplitude to each channel, first variable phase-shifters and amplifiers and a Butler matrix the outputs of which are connected via second variable phase-shifters to the radiating source elements of the antenna. Varying the phase-shifts introduced by the first and second phase-shifters reconfigures the transmitted beam optimally. A preferred variant of the system further includes variable attenuators. A control device is used to apply optimization parameters. A method of optimizing the resulting configuration uses a gradient search algorithm.

REFERENCES:
patent: 4124852 (1978-11-01), Steudel
patent: 4315262 (1982-02-01), Acampora et al.
patent: 4980692 (1990-12-01), Rudish et al.
patent: 5548295 (1996-08-01), Lo Forti et al.
patent: 5550550 (1996-08-01), Das
Sandrin, W.A., "Spatial Distribution of Intermodulation Products in Active Phased Array Antennas," IEEE Transactions on Antennas and Propagation, vol. 21, No. 6, Nov. 1973, pp. 864-868.
Angelucci, A. et al., "High Performance Microstrip networks for Multibeam and Reconfigurable Operation in Mobile-Radio Systems," Proceeding Of The Global Telecommunications Conference, Nov. 28, 1994, vol. 3 or 3, pp. 1717-1721.

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