Perfect impedance-matched left-handed behavior in combined metamaterialN. T. Tung, T. X. Hoai, V. D. Lam, J. W. Park, V. T. Thuy and Y. P. LeeEur. Phys. J. B, 74 1 (2010) 47-51DOI: https://doi.org/10.1140/epjb/e2010-00067-8