=== Hertzian Dipole Sources ===
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[[File:PO30.png|thumb|300px|PO Module's Short Dipole Source dialog]]
A short Hertzian dipole is the simplest way of exciting a structure in EM.Illumina. A short dipole source acts like an infinitesimally small ideal current source. To define a short dipole source, follow these steps:
=== Plane Wave Sources ===
[[File:PO29.png|thumb|300px|PO Module's Plane Wave dialog]]
Your physical structure in EM.Illumina can be excited by an incident plane wave. In particular, a plane wave source is needed to compute the radar cross section of a target. A plane wave is defined by its propagation vector indicating the direction of incidence and its polarization. EM.Illumina provides the following polarization options: TMz, TEz, Custom Linear, LCPz and RCPz.
* The direction of the Plane Wave is determined by the incident '''Theta''' and '''Phi''' angles in degrees. You can also set the '''Polarization''' of the plane wave and choose from the five options described earlier.
* If the '''Custom Linear''' option is selected, you also need to enter the X, Y, Z components of the '''E-Field Vector'''.
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<table>
<tr>
<td> [[File:PO30.png|thumb|300px|PO Module's Short Dipole Source dialog]] </td>
<td> [[File:PO29.png|thumb|300px|PO Module's Plane Wave dialog]] </td>
</tr>
</table>
=== Huygens Sources ===