Md Jizat, N. ., Yamada, Y. ., & Yusoff , Z. . (2023). Multibeam Array Antenna with Compact Size Butler Matrix for Millimeter-Wave Application. International Journal of Integrated Engineering, 15(3), 140-152. https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/12883