{{Note| [[EM.Tempo]] can only handle regular, non-skewed periodic lattices with no secondary offsets.}}
[[Image:Info_icon.png|30px]] Click here to learn more about the theory of '''[[Basic_FDTD_TheoryBasic_Principles_of_The_Finite_Difference_Time_Domain_Method#Time_Domain_Simulation_of_Periodic_Structures | Time Domain Simulation of Periodic Structures]]'''.
===Defining a Periodic Structure in EM.Tempo===