Elkorany, A. S., G. Ahmed, D. Saleeb, and H. A. Mohamed. “Tunable Elliptical Split Ring Resonator Using Single Varactor Diode”. Advanced Electromagnetics 7, no. 1 (January 29, 2018): 7–12. Accessed October 25, 2025. https://www.aemjournal.org/index.php/AEM/article/view/580.