Click on each category to learn more details about it in the [[Glossary of EM.Cube's Excitation Sources]].
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. The total radiated power by your dipole source is calculated and displayed in Watts in its property dialog. Your physical structure in EM.Illumina can also be excited by an incident plane wave. In particular, you need a plane wave source to compute the radar cross section of a target. The direction of incidence is defined by the θ and φ angles of the unit propagation vector in the spherical coordinate system. The default values of the incidence angles are θ = 180° and φ = 0° corresponding to a normally incident plane wave propagating along the -Z direction with a +X-polarized E-vector. Huygens sources are virtual equivalent sources that capture the radiated electric and magnetic fields from another structure that was previously analyzed in another [[EM.Cube]] computational module.  <table><tr><td> [[File:PO30.png|thumb|360px|EM.Illumina's Short Dipole Source dialog.]] </td><td> [[File:PO29.png|thumb|360px|EM.Illumina's Plane Wave dialog.]] </td></tr></table>
== EM.Illumina's Simulation Data & Observables ==