A Self-Consistent Extrapolation Method for the Complex Permittivity and Permeability Based on Finite Frequency Data

We describe a method of extrapolation based on a "truncated" Kramers-Kronig relation for the complex permittivity ($ε$) and permeability ($μ$) parameters of a material, based on finite frequency data. Considering a few assumptions, such as the behavior of the loss tangent and the overall nature of corrections, the method is robust within a small relative error, if the assumed hypotheses hold at the extrapolated frequency range.

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