A new FDTD subgridding boundary condition for FDTD subcell lossy thin-layer modeling

In this work we present a novel algorithm based on a subgridding boundary condition, for the subcell treatment of conductive thin-layer in FDTD (SGBC). We show that this technique provides a robust late-time stability behavior, compared to classical impedance boundary condition (IBC) methods, with affordable computer requirements. The method is validated by means of high-frequency scattering problems as well as with low-frequency transfer impedance prediction of tubular shells.