| 摘要 |
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 nxn 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 DEG phase shifters such that, for example, the first or (n+1)th element to the right of the nth element is coupled to the same port of the Butler matrix coupled to the 1st element but additionally through a fixed 180 DEG phase shifter while the first or 0th element to the left of the 1st element is coupled to the nth same port coupled to the nth element but including a respective 180 DEG 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 DEG phase shifters, the result being an amplitude taper of the composite beams formed thereby.
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