Soerbakti, Y., D. Defrianto, A. S. Rini, and V. Asyana. “Performance Analysis of Metamaterial Antennas Based on Variations in Combination and Radius of Hexagonal SRR”. Science, Technology, and Communication Journal, vol. 4, no. 1, Oct. 2023, pp. 1-4, doi:10.59190/stc.v4i1.250.