Singha, R., and D. Vakula. “Low Side Lobe Tapered Slot Antenna With High Gain Using Gradient Refractive Index Metamaterial for Ultra Wideband Application”. Advanced Electromagnetics 6, no. 4 (November 8, 2017): 63-69. Accessed August 9, 2020. https://www.aemjournal.org/index.php/AEM/article/view/575.