Malhat, H. A. E., S. H. Zainud-Deen, W. M. Hassan, and K. H. Awadalla. “Radiation Characteristics Enhancement of Dielectric Resonator Antenna Using Solid/Discrete Dielectric Lenses”. Advanced Electromagnetics 4, no. 1 (February 19, 2015): 1–9. Accessed October 22, 2021. https://www.aemjournal.org/index.php/AEM/article/view/275.