Orthogonal beam forming network

Details Orthogonal beam forming network Orthogonal beam forming network

1984-06-19

1987-01-20

Blum, Theodore M.

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

Directive

Including a steerable array

342368, H01Q 0340

Patent

active

046383174

ABSTRACT:
A binary Butler matrix is expanded into a non-binary matrix coupled to a like number of non-binary antenna elements for forming multiple beams from a phased array and wherein an n.times.n Butler matrix drives n+l elements, and where the l elements are coupled to predetermined ports of the Butler matrix normally coupled to the n elements but coupled thereto through respective 180.degree. phase shifters such that, for example, the first or (n+1).sub.th element to the right of the n.sub.th element is coupled to the same port of the Butler matrix coupled to the 1st element but additionally through a fixed 180.degree. phase shifter while the first or 0.sub.th element to the left of the 1st element is coupled to the n.sub.th same port coupled to the n.sub.th element but including a respective 180.degree. phase shifter. Progressively increasing numbers of elements on either side of the n elements are respectively coupled to ascending and descending numbered ports of the binary matrix through respective 180.degree. phase shifters, the result being an amplitude taper of the composite beams formed thereby.

REFERENCES:
patent: 3255450 (1966-06-01), Butler
patent: 3295134 (1966-12-01), Lowe
patent: 4028710 (1977-06-01), Evans
patent: 4231040 (1980-10-01), Walker

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