Hello Xiaowei Li
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Robert Koslover
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Posted:
1 decade ago
Jan 6, 2010, 2:07 p.m. EST
I'm surprised no one responded to this question earlier. RF problems are normally solved as either frequency-domain or time-domain wave-type solutions to Maxwell's equations. All frequency-domain problems are "coherent" at any given frequency, essentially by definition. However, multiple incoherent sources could in principle be modeled in time domain using source driving functions that are nearly random (but kept within some finite frequency bandwidth). However, a better solution to your class of problem would likely be to apply a different method entirely. For example, incoherent optical behavior is for many purposes nicely described by ray-tracing/geometric optics. Finite elements (on which Comsol Multiphysics is based) is apparently not the best way to implement that. Fortunately, there exist many low-cost, and some free, ray-tracing codes available for downloading on the internet. Just do a search for ray-tracing codes. Good luck.
I'm surprised no one responded to this question earlier. RF problems are normally solved as either frequency-domain or time-domain wave-type solutions to Maxwell's equations. All frequency-domain problems are "coherent" at any given frequency, essentially by definition. However, multiple incoherent sources could in principle be modeled in time domain using source driving functions that are nearly random (but kept within some finite frequency bandwidth). However, a better solution to your class of problem would likely be to apply a different method entirely. For example, incoherent optical behavior is for many purposes nicely described by ray-tracing/geometric optics. Finite elements (on which Comsol Multiphysics is based) is apparently not the best way to implement that. Fortunately, there exist many low-cost, and some free, ray-tracing codes available for downloading on the internet. Just do a search for ray-tracing codes. Good luck.
