T P Madhav, B, and M Purna Kishore. “Bandwidth Enhanced CPW Fed Elliptical Wideband Antenna With Slotted Defected Ground Structure”. International Journal of Engineering & Technology, vol. 7, no. 2.8, Mar. 2018, pp. 365-71, https://doi.org/10.14419/ijet.v7i2.8.10464.