Getting Extinction cross section from Radar cross section using HFSS

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SUMMARY

The discussion centers on using HFSS (High-Frequency Structure Simulator) to derive the extinction cross section from the radar cross section (RCS) of a particle. It is established that the extinction cross section is indeed the imaginary part of the RCS in the forward direction. The user encountered unexpected results, including values around 1e-13 and negative numbers, when attempting to extract the imaginary part at 0 degrees. This indicates a potential misunderstanding of the methodology or the specific parameters used in the HFSS simulation.

PREREQUISITES
  • Understanding of HFSS (High-Frequency Structure Simulator) software
  • Knowledge of radar cross section (RCS) and its components
  • Familiarity with electromagnetic theory, particularly related to scattering
  • Basic skills in interpreting complex numbers in a physical context
NEXT STEPS
  • Review the HFSS tutorial on radar cross section calculations
  • Study the relationship between RCS and extinction cross section in electromagnetic scattering
  • Explore advanced settings in HFSS for accurate modeling of particle interactions
  • Investigate common pitfalls in extracting imaginary components from complex data
USEFUL FOR

This discussion is beneficial for electromagnetic engineers, researchers in particle scattering, and users of HFSS seeking to accurately compute extinction cross sections from radar cross sections.

El Flea
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Hi, Has anyone tried using the HFSS software to get the extinction cross section of a particle?

I've been told that the extinction cross section of a particle is the imaginary part of the radar cross section in forward direction, so I did exactly what the RCS tutorial from HFSS did, except using my own model and frequencies, and getting just the 0deg im(ComplexRCS).
Where, I'm supposed to get results around 1 point something, I got results around 1e-13 and some negative numbers. And it gets even smaller if I divide it by the wavenumber. Was I wrong to just take the imaginary part of the radar cross section in 0deg as the extinction cross section?
 
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Check this answer from another site: https://www.researchgate.net/post/Extinction_cross-section_for_Nano-particle_on_a_film-Lumerical_COMSOL
 
Check this answer from another site: https://www.researchgate.net/post/Extinction_cross-section_for_Nano-particle_on_a_film-Lumerical_COMSOL
 

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