A locally conformal finite difference time domain technique for modeling arbitrary shaped objects

The authors have previously reported a simple yet accurate technique for the FDTD analysis of curved PEC bodies using a locally conformal grid. This approach does not require borrowing and interpolation of the electric field at the object boundary. In this paper, we extend this technique to arbitrarily shaped dielectric bodies and illustrate its application by investigating a partially filled rectangular waveguide structure and a partially filled cavity.