== Excitation Sources ==
Your planar structure must be excited by some sort of a signal source that induces electric currents on metal parts and magnetic currents on slot traces. The excitation source you choose depends on the observables you seek in your project. EM.Picasso provides the following source types for exciting planar structures:
* '''[[Common_Excitation_Source_Types_in_EM.Cube#Lumped_.26_Gap_Sources | Gap Sources]]'''