Khalil, M. A., Yong, W. H., Islam, M. T., Hoque, A., Islam, M. S., leei, C. C., Soliman, M. S. (2026). Retraction Note: Double-negative metamaterial square enclosed Q.S.S.R For microwave sensing application in S-band with high sensitivity and Q-factor. Scientific Reports. https://doi.org/10.1038/s41598-026-49765-9