Composite materials in which both permittivity and permeability possess negative values at some frequencies has recently gained considerable attention [see e.g., D. R. Smith et al., "Composite medium with simultaneously negative permeability and permittivity",
CITATION STYLE
Engheta, N. (2002). Ideas for Potential Applications of Metamaterials with Negative Permittivity and Permeability. In Advances in Electromagnetics of Complex Media and Metamaterials (pp. 19–37). Springer Netherlands. https://doi.org/10.1007/978-94-007-1067-2_2
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