Energy and power in nonreciprocally coupled coils

Recently, P.M. Lin (see ibid., vol.36, no.9, p.1153-8, 1989) criticized some proofs of the equality of the mutual inductances L ₁₂=L₂₁ for coupled coils. In so doing, he presented some energy and power expressions for the case L ₁₂≠L₂₁. Although all the considerations of P.M. Lin are correct, his transient analysis for the case L₁₂≠L₂₁ is not sufficiently general and might suggest misleading conclusions.. The author generalizes P.M. Lin´s treatment and presents a physical interpretation of the inductance two-port with L₁₂≠L₂₁, based on a novel active nonreciprocal equivalent circuit