</tr>
</table>
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== Using EM.Terrano as an Asymptotic Field Solver ==
== Defining Sources & Observables for Your SBR Simulation ==
Like every other electromagnetic solver, EM.Terrano's SBR ray tracer requires an excitation source and one or more observables for the generation of simulation data. EM.Terrano offers several types of sources and observables for a SBR simulation. You already learned about the transmitter set as a source and the receiver set as an observable. You can mix and match different source types and observable types depending on the requirements of your modeling problem. Â The available source types in EM.Terrano are (click on each type to learn more about it):
* '''[[#Defining Transmitter Sets | Transmitter]]'''
* '''[[#Defining_a_Hertzian_Dipole_Source | Hertzian Dipole]]'''
The available observables types are (click Click on each type to learn more about it). The available observables types in EM.Terrano are:
* '''[[#Defining Receiver Sets | Receiver]]'''
* '''[[#Computing_Radiation_Patterns_In_SBR | Far Field Radiation Pattern]]'''
* '''[[Hybrid_Modeling_using_Multiple_Simulation_Engines#Generating_Huygens_Surface_Data | Huygens Surface]]'''
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Click on each type to learn more about it.
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 a base point as well as an imported radiation pattern file with a '''.RAD''' file extension.