Abdul Khalid, M. F., Z. Ismail Khan, Z. Awang, I. Pasya, N. Ab Wahab, and I. M. Yassin. 2017. “Dual-Band Bandpass Filter With Dumbbell Shaped Defective Ground Structure”. International Journal on Advanced Science, Engineering and Information Technology 7 (2):695-701. https://doi.org/10.18517/ijaseit.7.2.1342.