Irshad Ullah, Muhammad Irfan Khattak, and Muhammad Farooq. 2019. “Designing and Analyzing a Planer Butler Matrix for Phased Array Antenna for Future 5G Applications”. IEEEP New Horizons Journal 101 (1): 39-45. https://mail.ieeepnhrj.org/index.php/ieeep/article/view/18.