Changes

{{Note|Keep in mind that you are always responsible for the choice of excitation source and the project observables. In other words, EM.Tempo does not automatically provide a default excitation source or does not suggest default observables.}}

Once you build your physical structure in the project workspace and define an excitation source, you are ready to run an FDTD simulation. The simulation engine will run even if you have not defined any observables. Obviously, no simulation data will be generated in that case. EM.Tempo currently offers several different simulation modes as follows (click on each type to learn more about it):

* '''[[Parametric_Modeling,_Sweep_%26_Optimization#Running_Parametric_Sweep_Simulations_in_EM.Cube | Parametric Sweep]]'''

* '''[[Parametric_Modeling,_Sweep_%26_Optimization#Optimization | Optimization]]'''

* '''[[Building_Reusable_Models#Running_an_HDMR_Sweep | HDMR Sweep]]'''

* '''[[Modeling_Periodic_Structures#Running_a_Dispersion_Sweep_in_EM.Tempo | Dispersion Sweep]]''' for periodic structures excited using a plane wave source

Analysis is EM.Tempo's simplest and most straightforward simulation mode. It runs the FDTD time marching loop once. At the end of the simulation, the time-domain field data are transformed into the frequency domain using a discrete Fourier transform (DFT). As a result, you can generate wideband frequency data from a single time-domain simulation run. The other simulation modes will be explained later in this manual.