Application of the Stability Criterion to the Passive Electromagnetic Structures Modeling

The full wave time-domain numerical simulation of the 3-D electromagnetic structure yields wide band reaction of the multiport microwave circuit on the input electromagnetic signal. The realization of the system identification procedure demands the preliminary determination of the late-time border and the order of the pole model. The new criterion for their estimation is offered. This criterion is based on the stability of physical poles positions and uses the signature comparison technique as a tool of the distinction estimation. The impulse response reconstruction approach using the late time part of scattered waveform improves accuracy for parameter estimation in comparison with singular value decomposition (SVD) conventional procedure. The verification of the developed model for coplanar resonator is presented