== Excitation Sources ==
[[Image:MOM6B.png|thumb|320px|EM.Libera's Strip Gap Source dialog.]]
Your 3D physical structure must be excited by some sort of signal source that induces electric linear currents on thin wires, electric surface currents on metal surface and both electric magnetic surface currents on the surface of dielectric objects. The excitation source you choose depends on the observables you seek in your project. EM.Libera provides the following source types for exciting your physical structure (click on each type to learn more about it):
[[Image:Info_icon.png|40px]] Click here to learn more about '''[[Common_Excitation_Source_Types_in_EM.Cube#Defining_Finite-Sized_Source_Arrays | Using Source Arrays in Antenna Arrays]]'''.
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<td> [[Image:MOM6.png|thumb|320px|EM.Libera's Wire Gap Source dialog.]] </td>
<td> [[Image:MOM6B.png|thumb|320px|EM.Libera's Strip Gap Source dialog.]] </td>
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