Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1990-09-21
1992-05-19
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
342368, H01Q 322
Patent
active
051152487
ABSTRACT:
A multibeam antenna comprising Ne feed elements and emitting Nb beams each generated by a group of Nc elements has a feed device comprising a set of Nc power dividers. These power dividers are unitary orthogonal distribution matrix power dividers of order P, where P is equal to the power of two equal to or immediately higher than the ratio Ne/Nc. The outputs of the dividers are connected to the various elements in such a way that each element of one of the aforementioned groups contributing to a beam is connected to a different power divider and so that adjacent beams share feed elements. A beam forming network has P.times.Nc outputs connected to amplifiers in turn connected to the inputs of the power dividers. This network has Nb inputs. The beam forming network is usually a low-level network. The device finds a specific application in satellite communications.
REFERENCES:
patent: 3731316 (1973-05-01), Sheleg
patent: 3740756 (1972-03-01), Sosin
patent: 4901085 (1990-02-01), Spring et al.
Sharad V. Parekh et al., "Active Antennas for Satellite Communications", IEEE Int'l Conf. on Communications 1985, vol. 3, Jun., 1985, pp. 1299-1305.
Leo G. Cardone, "Wideband Electro-Optical Microwave Beamforming Technique", Conf. Proceed. Military Microwaves, '86, pp. 391A-391F.
S. Egami and M. Kawai, "An Adaptive Multiple Beam System Concept", IEEE Journal on Selected Areas in Communications, May 1987, pp. 630-636.
J. P. Shelton and K. S. Kelleher, "Multiple Beams for Linear Arrays", IRE Transactions on Antennas and Propagation, Mar. 1961, pp. 154-161.
Agence Spatiale Europeenne
Issing Gregory C.
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