* Far Field Radiation Pattern
* Huygens Surface
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A short dipole source is the simplest type of excitation for your propagation scene. A short dipole has an almost "omni-directional" radiation pattern, and is the closest thing to an isotropic radiator. EM.Terrano does not provide a theoretical/hypothetical isotropic transmitter because its SBR solver is fully polarimetric and requires a real physical radiator for ray generation. A transmitter is a more sophisticated source that requires an imported radiation pattern file with a '''.RAD''' file extension.
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{{Note| In order to define a transmitter, you need to import a radiation pattern file from one of [[EM.Cube]]'s other computational modules.}}
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Of the above list of EM.Terrano's observables types, receivers are the ones you would typically use for your propagation scenes. Unlike a transmitter, a receiver by default does not require an imported radiation pattern file. A default receiver is assumed to be polarization-matched to the incoming ray. The other three observable types, field sensor, far fields and Huygens surface are primarily used in applications that utilize EM.Terrano as an [[Asymptotic Field Solver|asymptotic field solver]].
[[Image:MORE.png|40px]] Click here to learn more about defining field sensor observables for '''[[Data_Visualization_and_Processing#Visualizing_3D_Near-Field_Maps | Visualizing 3D Near-Field Maps]]'''.