# Multiconductor Transmission Line (MTL)

An arbitrary cable (shielded or unshielded) can be solved using the multiconductor transmission line (MTL) solution method hybridised with the MoM, MLFMM or FDTD (only irradiation).

MTL theory is used to model the cable problem, while the MoM or MLFMM is used for the solution of the external fields and currents that couple to or from the cable harness.

MTL theory is limited in application to situations where cables run close to a ground plane. The cable path should be within $\frac{\lambda }{5}$ (ideally within $\frac{\lambda }{10}$ ) of the conducting surface. Cables that are solved with the MTL may not be connected directly to MoM geometry. The connection between the cable circuit and ground is modelled using non-radiating networks.