Electromagnetic-based derivation of fractional-order circuit theory

In this paper, foundations of the fractional-order circuit theory are revisited. Although many papers have been devoted to fractional-order modelling of electrical circuits, there are relatively few foundations for such an approach. Therefore, we derive fractional-order lumped-element equations for capacitors, inductors and resistors, as well as Kirchhoff's voltage and current laws using quasi-static approximations of fractional-order Maxwell's equations. The proposed approach is not limited by the geometry of the considered lumped elements and employs the concepts of voltage and current known from the circuit theory. Finally, the proposed theory of circuit elements is applied to interpretation of Poynting's theorem in fractional-order electromagnetism. (C) 2019 Elsevier B.V. All rights reserved.