Interfacial Numerical Dispersion and New Conformal FDTD Method
This work addresses a fundamental limitation in FDTD modeling of electromagnetic interfaces, offering a more accurate method for simulating lossy materials in computational electrodynamics.
The paper identifies a new type of numerical dispersion at interfaces in FDTD simulations and proposes a conformal FDTD method that accounts for penetrative depth and free charge/current distributions, enabling accurate simulation of lossy conductors beyond traditional PEC or simple dielectrics.
This article shows the interfacial relation in electrodynamics shall be corrected in discrete grid form which can be seen as certain numerical dispersion beyond the usual bulk type. Furthermore we construct a lossy conductor model to illustrate how to simulate more general materials other than traditional PEC or simple dielectrics, by a new conformal FDTD method which main considers the effects of penetrative depth and the distribution of free bulk electric charge and current.