is based on the telegraph model, which treats TL as a series of RLGC cells. This model is suitable to describe conducted phenomena in wired networks, since it provides a tool to analyze the propagation of the voltage and current waves and to account for dielectric and ohmic losses. However, the model does not take into account the losses due to the propagation of radiated power in the dielectric surrounding the TL. A recent work [@ianconescu] showed that finite length TLs excited by differential mode currents radiate power next to the line terminations. Our aim in this section is to summarize the main results of the mentioned work and to extend the results to TLs excited by common mode currents.

Considering a TL of length L made by two conductors in free space and neglecting any dielectric loss for simplicity, the magnetic potential vector $\mathbf{A}$ is [@hoop] $$\begin{gathered}
\mathbf{A}\left(d\right)=\mu_{0}e^{-jkz}\intop_{0}^{L}dz'\ointop dcK_{f}\left(c\right)e^{-jkz'}G\left(d\right)\hat{\mathbf{z}}+\\
+\mu_{0}e^{jkz}\intop_{0}^{L}dz'\ointop dcK_{r}\left(c\right)e^{jkz'}G\left(d\right)\hat{\mathbf{z}}\label{eq:A}\end{gathered}$$ where $\mu_{0}$ is the vacuum permeability, $k$ is the propagation constant, $K_{f}$ and $K_{r}$ are the forward and reverse surface current waves respectively as function of the contour $c$, $G$ is the Green’s function $$G\left(s\right)=\frac{e^{-jks}}{4\pi s}$$ and $d$ is the distance of the observation point $\left(x,y,z\right)$ from the 