Mohd Zahari, Mohd Kamil, and Mohd Azlishah Othman. 2016. “Analysis of Dumbbell Shaped Defected Ground Structure With Low-Pass Filter at X-Band for Radar Application”. Politeknik & Kolej Komuniti Journal of Engineering and Technology 1 (1). Putrajaya, Malaysia:15-31. https://app.mypolycc.edu.my/journal/index.php/PMJET/article/view/508.