My high-level understanding of the near to far field calculation is that it uses dft to compute equivalent current on the near field box and convolve with the green's function to compute the field in the far field. When I looked into the implementation of the function dft_near2far::farfield_lowlevel, I was wondering where the integration over current sources is done. It seems that the code it's adding up the field contribution from each equivalent current source on the near field box. Maybe I'm missing a place where the numerical integration is performed or I have some misunderstanding.
Thanks!
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