The Unconditionally Stable Associated Hermite FDTD Method With Dielectric Coating Thin Wires Model

This letter presents a model for dielectric coating thin wires based on the unconditionally stable (US) associated Hermite finite-different time-domain (AH FDTD) method. On the premise of a static field model of infinite-length thin wires, using Faraday’s law contour-path formulation, the coefficient matrix equation of dielectric coating thin wires in the AH domain is deduced, and, finally, the model is completed. Taking the five-element Yagi antenna and square antenna as examples, the results of this model are compared with the traditional finite-different time-domain (FDTD) method. The results show that the dielectric coating thin wires model can maintain the relative difference of below −40 dB and improve the calculation speed.