Not trying to argue for the feasibility of space based solar power, but the inverse square law applies in the far field i.e. when the emitter can be approximate

Not trying to argue for the feasibility of space based solar power, but the inverse square law applies in the far field i.e. when the emitter can be approximated as a point source. Depending on the wavelength and the antenna size this is not necessarily the case: https://en.m.wikipedia.org/wiki/Fraunhofer_distance https://en.m.wikipedia.org/wiki/Fraunhofer_distance E.g. for 3 GHz and a 500 m antenna, the far field starts at about 5,000 km