Norhudah Seman, Khairul Huda Yusof, Mohd Haizal Jamaluddin, and Tharek Abd Rahman. “Ultra-Wideband Six-Port Network Constructed by 90° and In-Phase Power Dividers”. Applied Computational Electromagnetics Society Journal (ACES), vol. 34, no. 05, May 2019, pp. 689-95, https://journals.riverpublishers.com/index.php/ACES/article/view/8465.