Md Jizat, Noorlindawaty, Yoshihide Yamada, and Zubaida Yusoff. “Multibeam Array Antenna With Compact Size Butler Matrix for Millimeter-Wave Application”. International Journal of Integrated Engineering 15, no. 3 (August 15, 2023): 140–152. Accessed May 20, 2024. https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/12883.