Recent Developments of Butler Matrix From Components Design Evolution to System Integration for 5G Beamforming Applications: A Survey. - Abdulkadir Bello Shallah; Farid Zubir; Mohamad Kamal A. Rahim; Huda A. Majid; Usman Ullah Sheikh; Noor Asniza Murad; Zubaida Binti Yusoff (IEEE Access, 2022)

A Miniaturized Metamaterial-Based Dual-Band 4×4 Butler Matrix With Enhanced Frequency Ratio for Sub-6 GHz 5G Applications. - Abdulkadir Bello Shallah; Farid Zubir; Mohamad Kamal A. Rahim; Noorlindawaty Md Jizat; Abdul Basit 008; Maher Assaad; Huda A. Majid (IEEE Access, 2024)