Paul, P. M., K. Kandasamy, and M. S. Sharawi. “A Multi-Band U-Strip and SRR Loaded Slot Antenna With Circular Polarization Characteristics”. Advanced Electromagnetics 9, no. 1 (March 20, 2020): 41-48. Accessed June 4, 2020. https://aemjournal.org/index.php/AEM/article/view/1183.