Jinlin Liu, Tao Su, Huanhuan Lv, Lei Lin, and Bian Wu. “Six-Channel Diplexer Using Stub-Loaded Stepped Impedance Resonators”. Applied Computational Electromagnetics Society Journal (ACES), vol. 34, no. 10, Oct. 2019, pp. 1582-7, https://journals.riverpublishers.com/index.php/ACES/article/view/8179.