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== An EM.Illumina is a 3D electromagnetic simulator for modeling large free-space structures. It features a high frequency asymptotic solver based on Physical Optics (PO) for simulation of electromagnetic scattering from large metallic structures and impedance surfaces.Primer ==

=== EM.Illumina provides a computationally efficient alternative for extremely large structures when a full-wave solution becomes prohibitively expensive. Based on a high frequency asymptotic physical optics formulation, it assumes that an incident source generates currents on a metallic structure, which in turn reradiate into the free space. A challenging step in establishing the PO currents is the determination of the lit and shadowed points on complex scatterer geometries. Ray tracing from each source to the points on the scatterers to determine whether they are lit or shadowed is a time consuming task. To avoid this difficulty, EM.Illumina's simulator uses a novel Iterative Physical Optics (IPO) formulation, which automatically accounts for multiple shadowing effects.The IPO technique can effectively capture dominant, near-field, multiple scattering effects from electrically large targets.Nutshell ===

EM.Illumina's is a 3D electromagnetic simulator is seamlessly interfaced with [[EMfor modeling large free-space structures.Cube|EM.CUBE]]'s other simulattion engines. This module is the ideal place to define Huygens sources. These are It features a high frequency asymptotic solver based on Huygens surface data that are generated using a full-wave simulator like [[EM.Picasso]], [[EM.Tempo]] or [[EM.Libera]]Physical Optics (PO) for simulation of electromagnetic scattering from large metallic structures and impedance surfaces.

== Methods Of EM.Illumina provides a computationally efficient alternative to full-wave solutions for extremely large structures when full-wave analysis becomes prohibitively expensive. Based on a high frequency asymptotic physical optics formulation, it assumes that an incident source generates currents on a metallic structure, which in turn reradiate into the free space. A challenging step in establishing the PO currents is the determination of the lit and shadowed points on complex scatterer geometries. Ray tracing from each source to the points on the scatterers to determine whether they are lit or shadowed is a time consuming task. To avoid this difficulty, EM.Illumina's simulator uses a novel Iterative Physical Optics ==(IPO) formulation, which automatically accounts for multiple shadowing effects. The IPO technique can effectively capture dominant, near-field, multiple scattering effects from electrically large targets.

[[EM.Cube]]'s Physical Optics (PO) Module Illumina organizes physical objects by their surface type. A regular object is assumed to be made of one of the three surface types: