A Vector Fitting-Based Equivalent Circuit Modeling Method for Multi-Port RF Components

This paper proposes an equivalent circuit modeling method for multi-port radio-frequency (RF) components based on vector fitting (VF), aiming to address the challenge of accurate equivalent circuit modeling in field-circuit co-simulations. First, the admittance parameters of multi-port RF components are transformed into pole-residue polynomials using the VF technique. Subsequently, passivity assessment and compensation are performed. Finally, the pole-residue model is converted into an equivalent circuit form with physical significance. The effectiveness of the proposed method is validated through a coplanar spiral inductor.