Characterization and electromagnetic response of a ϕ-shaped metamaterial N. T. Tung, J. W. Park, V. T.T. Thuy, P. Lievens, Y. P. Lee and V. D. Lam Eur. Phys. J. B, 81 3 (2011) 263-268 Published online: 07 June 2011 DOI: 10.1140/epjb/e2011-20114-2