Hi why close to electric field source the free space wave inpedance Z0 is high (and the electric field is also high) and then only at long distances (Frouhnofer region) the ratio of electric field over the magnetic field ( that is Z0) becomes the same as for a magnetic field source? I would expect for all distances the same ratio Z0. It seems that for electric field source, the electric field close to the source decreases very fast compared with magnetic field; the opposite for a magnetic field source where the magnetic field decrease rapidly. Maybe it can look as a trivial question but what is your opinion/suggestions or experiences about that? thanks in advance !
Regards
Massimo
Regards
Massimo