Passive equivalent circuits of complex discontinuities: an improved extraction technique

The paper deals with the modelization of complex discontinuities by passive lumped equivalent circuits. To this aim, an improved circuit extraction technique is proposed The procedure is based on the approximation of the admittance/impedance parameters of the discontinuities derived by full-wave numerical simulations, in terms of rational functions suitable for the synthesis of high-order equivalent lumped circuits. The proposed extraction technique permits to derive directly feasible equivalent circuits which implicitly satisfy the passivity requirement.