  Power distribution grids are exploited by Power Line Communication (PLC)
technology to convey high frequency data signals. The natural conformation of
such power line networks causes a relevant part of the high frequency signals
traveling through them to be radiated instead of being conducted. This causes
not only electromagnetic interference (EMI) with devices positioned next to
power line cables, but also a consistent deterioration of the signal integrity.
Since existing PLC channel models do not take into account losses due to
radiation phenomena, this paper responds to the need of developing accurate
network simulators. A thorough analysis is herein presented about the conducted
and radiated effects on the signal integrity, digging into differential mode to
common mode signal conversion due to network imbalances. The outcome of this
work allows each network element to be described by a mixed-mode transmission
matrix. Furthermore, the classical per-unit-length equivalent circuit of
transmission lines is extended to incorporate radiation resistances. The
results of this paper lay the foundations for future developments of
comprehensive power line network models that incorporate conducted and radiated
phenomena.
