Editing Near and far field (section)

===Transition zone===
Another intermediate region, called the ''transition zone'', is defined on a somewhat different basis, namely antenna geometry and excitation wavelength. It is approximately one wavelength from the antenna, and is where the electric and magnetic parts of the radiated waves first balance out: The electric field of a [[dipole antenna|linear antenna]] gains its corresponding magnetic field, and the magnetic field of a [[loop antenna]] gains its electric field. It can either be considered the furthest part of the near field, or the nearest part of the far field. It is from beyond this point that the electromagnetic wave becomes self-propagating. The electric and magnetic field portions of the wave are proportional to each other at a ratio defined by the characteristic impedance of the medium through which the wave is propagating.