warped and also cut at different lengths before being connected to the junction.

A final source of mode conversion is the difference in ground potentials. Also in indoor environments the ground is characterized by a finite resistance at high frequencies, which fosters the generation and propagation of CM currents.

### Unbalance at the load

Any network load can be represented by the impedances $Z_{L1}$, $Z_{L2}$ and $Z_{L3}$ connected at a line termination, as depicted in . Moreover, the coupling between the lines and the ground is modeled with three parasitic impedances $Z_{P1\dots 3}$. If the impedances of the common mode paths are different $(Z_{P1} \neq Z_{P2} \neq  Z_{P3})$ then part of the DM current will flow through the common mode path. This phenomenon reduces the power available at the load and generates common mode currents. Conversely, the same imbalance also causes CM to generate DM currents, which might corrupt the transmitted DM signal. The imbalance can be caused by different types of couplings between the load and the ground or other objects in the proximity of the load [@coupling_EMC].

Power Line Network Model {#sec:network_model}
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Given the MTRL PUL model presented in and the considerations about mode conversion done in 