===Modeling Planar Structures of Infinite Extents===
[[Image:FDTD23.png|thumb|300px|Domain Settings dialog]]
You may occasionally want to use EM.Cube's FDTD simulator to model planar structures. Although EM.Cube provides the more computationally efficient [[Planar Module]] for this very purpose, there are many cases when an FDTD simulation might prove advantageous over a 2.5-D MoM simulation. Examples include examining the transient response of a planar structure, very wideband simulations, planar structures involving complex materials or 3D geometries embedded inside the substrate layers, to name a few.