Masrukin, Y. E, N. Hassim, Z. Zakaria, N. S. A. S Ali, and M. S. A. M Noh. “New Compact Dual-Band Bandpass Filter Using Stepped Impedance Resonator and U-Shaped Microstrip Structure”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC) 9, no. 2-8 (September 1, 2017): 99–102. Accessed December 2, 2022. https://jtec.utem.edu.my/jtec/article/view/2636.