Total- and scattered-field decomposition technique for the finite-element time-domain modeling of buried scatterers

The total- and scattered-field decomposition (TSFD) technique, developed earlier for scattering in free space, is extended for the finite-element time-domain (FETD) modeling of scattering by an object either residing above, partially embedded, or completely buried in a lossy dielectric half-space. The formulation leads to both a volumetric and a Huygens' surface method to excite an incident field in the total-field region. Numerical examples demonstrate the accuracy and the flexibility of the method.