Time to hybrid FEM with FDTD

I want to continue the discussion of hybridizing FDTD and FEM together, for multi-scale problems, FEM is robust on geometry modeling and the accuracy is highly controllable, FDTD has dispersion errors because of stair-case mesh grids. However, it is extremely simple to implement and is very efficient. So for a multi-scale problem, when device size vary from mm to m. (Imagine small circuit or phased array elements interacting with each other on e-large platforms). none of FEM or FDTD can handle all cases in all situations, therefore, a hybrid of them should be used to best address such problem.

Indeed, such hybrid solvers offered now by Ansys, CST and possibly other vendors.

http://www.ansys.com/staticassets/AN...n%20Solver.pdf