Chin, S. J., M. Z. A. Abd. Aziz, and M. R. Ahmad. “CPW-Fed Circular Disc Monopole Antenna With Defected Waveguide Structures”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC), vol. 9, no. 2-8, Sept. 2017, pp. 79-83, https://jtec.utem.edu.my/jtec/article/view/2632.