A technique to reduce electromagnetic field radiated by indoor PLC systems

This paper proposes a technique aiming at reducing significantly the electromagnetic field radiated by indoor PLC signals, while not affecting the PLC signal itself. The basic idea is to take advantage of the additional ground conductor and inject a signal similar to the PLC signal into the ground- neutral line, but with a reversed phase. As a result, both the overall antenna mode- and transmission line mode-currents are significantly reduced, as well as the radiated electromagnetic fields. Numerical simulations obtained using NEC (Numerical Electromagnetics Code), as well as experimental measure- ments are also presented. It is shown that the proposed technique allows for a significant reduction (up to 20 dB) of the PLC electromagnetic radiation in the considered indoor frequency range (10-30 MHz).