Umeshkumar, D. S., and M. Kumar. “Design of an Ultra-Wideband Bandpass Filter for Millimeter Wave Applications”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC), vol. 10, no. 3, Aug. 2018, pp. 57-60, https://jtec.utem.edu.my/jtec/article/view/3300.