Awais Ahmed, & Nyi Nyi Naing. (2026). Multi-Ring 4×4 UWB–X–Ku MIMO Antennas for High-Resolution Microwave Imaging: A Review. Journal of Intelligent Engineering and Informatics, 1(1), 121-130. https://journaliei.org/index.php/jiei/article/view/18 (Original work published 2026)