Sucharita, C. V. S. A., K. Sneha, and N. N. Sastry. “A Wideband Annular Ring Radiator With Polygonal Ground Plane”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC), vol. 10, no. 1-4, Jan. 2018, pp. 165-8, https://jtec.utem.edu.my/jtec/article/view/3611.