The MTL method and concept of shading to model automotive wiring having wide and multiple ground planes

In automotive wiring application EM problems are often characterized by a wide span of ratio between geometrical size and signals wavelength. This is a critical situation for conventional numerical simulation tools. This paper proposes an efficient technique to overcome the difficulty of the wiring simulation on large vehicle chassis by reducing them. Using the MTL method and based on the electromagnetic shade of a cable to a ground plane, the area where currents distribution is concentrated is identified. Several geometrical configurations are studied with one or multiple grounds planes to evaluate the advantages in term of simulation costs (time and memory).