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Your physical structure in EM.Illumina can be excited by an incident plane wave. In particular, you need a plane wave source is needed to compute the radar cross section of a target. A plane wave The direction of incidence is defined by its the θ and φ angles of the unit propagation vector indicating in the direction spherical coordinate system. The default values of the incidence angles are θ = 180° and its polarizationφ = 0° corresponding to a normally incident plane wave propagating along the -Z direction with a +X-polarized E-vector. EM.Illumina provides the following polarization options: TMz, TEz, Custom Linear, LCPz and RCPz.

The direction of incidence is defined through the θ and φ angles of the unit propagation vector in the spherical coordinate system[[Image:Info_icon. The values of these angles are set in degrees in the boxes labeled '''Theta''' and '''Phi'''. The default values are θ = 180° and φ = 0° representing a normally incident plane wave propagating along the -Z direction with a +X-polarized E-vector. In the TM_z and TE_z polarization cases, the magnetic and electric fields are parallel png|40px]] Click here to the XY plane, respectively. The components of the unit propagation vector and normalized E- and H-field vectors are displayed in the dialog. In the learn more general case of custom linear polarization, besides the incidence angles, you have to enter the components of the unit electric '''Field Vectorabout '''[[Common_Excitation_Source_Types_in_EM. However, two requirements must be satisfied: '''ê . ê''' = 1 and '''ê × k''' = 0 . This can be enforced using the '''Validate''' button at the bottom of the dialog. If these conditions are not met, an error message pops up. The left-hand (LCP) and right-hand (RCP) circular polarization cases are restricted to the normal incidence only (θ = 180°). To define a plane wave source follow these steps: * Right click on the '''Cube#Plane_Wave_Sources | Plane Waves''' item in the '''Wave Sources''' section of the Navigation Tree and select '''Insert New Source...''' The Plane wave Dialog opens up.* 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. * If the '''Custom Linear''' option is selected, you also need to enter the X, Y, Z components of the '''E-Field Vector]]'''.