=== Plane Wave Sources ===
[[File:PO29.png|thumb|300px|PO Module's Plane Wave dialog]]
Your physical structure in PO Module can be excited by an incident plane wave. In particular, a plane wave source can be used 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.Cube's PO Module provides the following polarization options:
* In the Field Definition section of the dialog, you can enter the '''Amplitude''' of the incident electric field in V/m and its '''Phase''' in degrees. The default field Amplitude is 1 V/m with a zero Phase.
* 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. When the '''Custom Linear''' option is selected, you also need to enter the X, Y, Z components of the '''E-Field Vector'''.
[[File:PO29.png]]
Figure 1: PO Module's Plane Wave dialog.
=== Huygens Sources ===