A possibilistic approach to radiated susceptibility of twisted-wire pairs

Possibility theory is briefly presented and proposed for the evaluation of epistemic uncertainty in electromagnetic-compatibility models. In particular, fuzzy sets are exploited to describe some unknown/uncontrolled model parameters which cannot be rigorously treated through probability theory, since their statistical distribution is unknown. A hybrid approach is used to combine such possibilistic parameters with classical probabilistic parameters described by random variables, so to obtain a general, exhaustive description of uncertainty in model outputs. As an illustrative example, the proposed approach is applied to the estimation of differential mode currents induced in the terminations of a twisted wire pair with an unknown number of twists, illuminated by a random plane-wave field. The obtained results are compared versus conventional Monte Carlo simulations.