Nasir N, Bin Jamaluddin MH, Shahadan NH, Shairi NA. A Compact and Efficient U Slot Excited Substrate Integrated Waveguide Based Antenna for 5G-NR Millimeter Wave Band. IJIE. 2025;17(6):58-70. Accessed April 8, 2026. https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/21845