N. S. . Ishak, M. H. . Dahri, N. .A. . Awang, W. Y. . Chong, and F. C. . Seman, “Realization of Circular Slot Frequency Selective Surfaces using Photoplotter and Wet Etching Technique for Terahertz Material Sensing Applications”, ijie, vol. 12, no. 6, pp. 49–54, May 2020, Accessed: May 19, 2024. [Online]. Available: https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/6287