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Rahim, S.K.A. and Jizat, N.M. and Rahman, T.A. and Geok, T.K. and Reza, A.W. (2010) A novel design of Butler matrix using optimised size of branch-line coupler. Journal of Optoelectronics and Advanced Materials, 12 (10). pp. 2031-2039. ISSN 1454-4164,