Design and characterization of a compact single-layer multibeam array antennausing an 8×8 Butler matrix for 5G base station applications. - Intan Izafina Idrus; Tarik Abdul Latef; Narendra Kumar Aridas 001; Mohamad Sofian Abu Talip; Yoshihide Yamada; Tengku Faiz Tengku Mohmed Noor Izam; Tharek Abd Rahman (Turkish J. Electr. Eng. Comput. Sci., 2020)