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):
* {| class="wikitable"|-! scope="col"| Simulation Mode! scope="col"| Usage! scope="col"| Number of Engine Runs! scope="col"| Frequency ! scope="col"| Restrictions|-| style="width:150px;" | '''Wideband Analysis'''* | style="width:300px;" | Simulates the physical structure "As Is"| style="width:250px;" | Single run| style="width:250px;" | Generates data for many frequency samples| style="width:250px;" | None|-| style="width:150px;" | '''Parametric Sweep'''* | style="width:300px;" | Varies the value(s) of one or more project variables| style="width:250px;" | Multiple runs| style="width:250px;" | Runs at the center frequency fc| style="width:250px;" | None|-| style="width:150px;" | '''Optimization'''* | style="width:300px;" | Optimizes the value(s) of one or more project variables to achieve a design goal | style="width:250px;" | Multiple runs | style="width:250px;" | Runs at the center frequency fc| style="width:250px;" | None|-| style="width:150px;" | '''HDMR Sweep'''* | style="width:300px;" | Varies the value(s) of one or more project variables to generate a compact model| style="width:250px;" | Multiple runs | style="width:250px;" | Runs at the center frequency fc| style="width:250px;" | None|-| style="width:150px;" | '''Dispersion Sweep''' | style="width:300px;" | Varies the value of wavenumber in a periodic structure | style="width:250px;" | Multiple runs | style="width:250px;" | Runs at multiple frequency points corresponding to constant wavenumber values| style="width:250px;" | Only for periodic structures excited using by a plane wave source|}
=== Running a Wideband FDTD Analysis ===