Abstract
In this paper, the wire medium made of parallel thin wires is studied by using the FDTD method incorporating the sub-cell technique of thin wire. The conventional effective model for the wire medium is based on the 2th order dispersion equations; and it becomes inaccurate in describing the EM behavior of wire medium when the transversal spatial harmonics becomes high. A new effective model is proposed based on the 4th order dispersion equations and surface fitting, which guarantees the modeling accuracy for higher spatial harmonics.
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