Design and Analysis of Wideband Nonuniform Branch Line Coupler and Its Application in a Wideband Butler Matrix.Published in:International Journal of Antennas & Propagation, 2012, p. 1, doi. 10.1155/2012/853651By:Ningsih, Yuli K.;Asvial, M.;Rahardjo, E. T.Publication type:Article