Field-to-Wire Coupling in Bundles of Wires: Comparison between Different Models

In this paper, the electromagnetic disturbances induced by a plane-wave field in random wire bundles routed in close proximity with a ground plane is investigated by adopting a statistical approach. Accurate geometrical description of the random trajectories of the wires is used in combination with a multiconductor transmission line model of the bundle involving fine segmentation into a sequence of uniform cascaded sections. Repeated-run analysis is then adopted for reproduction of the frequency response of the voltages induced across the terminal loads. The outcomes of this analysis are compared versus a modeling approach previously developed and based on a more approximate representation of the wire trajectories. It is shown that the ability to reproduce smooth wire trajectories (mimicking the shape of wires in real bundles) is important in order to avoid artifacts in the frequency response, at specific frequencies, and lead to induced voltages which, at high frequencies, show probability density functions with different shape.