Soerbakti Y, Gamal MDH, Zamri Z, Defrianto D, Syahputra RF. Negative refractive index anomaly characteristics of SRR hexagonal array metamaterials. SINTECHCOM Journal [Internet]. 2024Feb.29 [cited 2025May17];4(2):63-8. Available from: https://sintechcomjournal.com/index.php/stc/article/view/261