Relative Contribution of DM and CM Currents in Power Line Telecommunication Emission

In this paper experiment and theory are provided on short sample power line to determine the magnetic field amplitude due to balanced high frequencies injection. The results show that close the line the radiation is governed by the differential mode (DM) current then above one meter from the line emission of the residual common mode (CM) current appears. Thus near the line this behaves as a long magnetic loop antenna feed by the DM current while far away is similar to a long electric antenna feed by the CM current. To conclude the paper some investigations are proposed about preliminary experiment carried out on indoor power line of 23 meters length running along the room walls.