EM.Tempo allows you to simulate doubly periodic structures with periodicities along the X and Y directions. Many interesting structures such as frequency selective surfaces (FSS), electromagnetic band-gap (EBG) structures and metamaterial structures can be modeled using periodic geometries. In the case of an infinitely extended periodic structure, it is sufficient to analyze only a unit cell. In the FDTD method, this is accomplished by applying periodic boundary conditions (PBC) at the side walls of the computational domain.
Click here to learn more about the theory of [[Time Domain Simulation of Periodic Structures]].
[[Image:FDTD134.png|thumb|320px|EM.Tempo's Periodicity Settings dialog]]