Angular light scattering by aerosol particles, including complex particles such as fractal aggregates, can give access to the size and morphology through an in-situ approach. For this purpose, the angular scattering signal must be processed by a theory that provides a structure factor, which takes into account particle shape. Such a function is accurately determined for X-rays or for transparent objects in the visible range since the assumption of no internal coupling is fairly well respected. However, for some materials such as fractal soot aggregates, the internal coupling is suspected to modify the morphological and size dependence of the structure factor. The objective of this work is to understand and quantify such a deviation from the internal electric field analysis using a phasor approach.