We also create two field sensors -- one with a z-normal underneath the aircraft, and another with an x-normal along the length of the aircraft. The nearfields are not the prime observable for this project, but they may add insight into the simulation, and do not add much overhead to the simulation.
Since we're computing a Radar Cross Section, we also need to add a planewave source. For this example, we will specify a TMz planewave with k = sqrt(2)/2 x - sqrt(2)/2 z, or theta = 135 degrees, phi = 0 degrees.
For the mesh, we use the "Fast Run/Low Memory Settings" preset. This will set the minimum mesh rate at 15 cells per lambda, and permits grid adaptation only where necessary. This preset provides slightly less accuracy than the "High Precision Mesh Settings" preset, but results in smaller meshes, and therefore shorter run times.
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[[Image:ff settings.png|thumb|left|200px|Figure 1: Geometry of the periodic unit cell of the dispersive water slab in EM.Tempo.]]
[[Image:ff settings.png|thumb|left|200px|Figure 1: Geometry of the periodic unit cell of the dispersive water slab in EM.Tempo.]]
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