Zhang Y, Ye H, Zhang J, Zhang X, Lü S. Design of Wideband 8×8 Butler Matrix using Composite Right/Left-handed Transmission Line for Multi-mode OAM Generation. ACES Journal [Internet]. 2024 Apr. 30 [cited 2026 Apr. 22];39(04):351-63. Available from: https://journals.riverpublishers.com/index.php/ACES/article/view/23675