Title:
2005_Soukoulis_parameter_retrieval
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Description: We discuss the validity of standard retrieval methods that assign bulk electromagnetic properties, such as the
electric permittivity« and the magnetic permeabilitym, from calculations of the scattering sSd parameters for
finite-thickness samples.S-parameter retrieval methods have recently become the principal means of characterizing artificially structured metamaterials, which, by nature, are inherently inhomogeneous. While the unit
cell of a metamaterial can be made considerably smaller than the free space wavelength, there remains a
significant variation of the phase across the unit cell at operational frequencies in nearly all metamaterial
structures reported to date. In this respect, metamaterials do not rigorously satisfy an effective medium limit
and are closer conceptually to photonic crystals.
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