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Inductive devices experience capacitative coupling between conductors at high frequencies. Modeling this phenomenon requires that you describe electric fields that have components both parallel with and perpendicular to the wire. This consideration might lead to the conclusion that a 3D model is always necessary to model the phenomenon, even if the coil is a helix, which is actually not the case.

The 3D inductor example demonstrates how to extract information related to the self-resonance of a 3D inductor by means of an axisymmetric simulation. In order to achieve a correct 2D axisymmetric model, an effective axisymmetric core is created, and the RLC Coil Group feature is employed. This lean method is particularly suitable for studying systems with thousands of turns, such as sensors or transformers, thus keeping the computational costs low.