Characterization of electromagnetic devices via reduced-order models

Efficient procedures are presented for simultaneously characterizing the ti me and frequency domain behavior of 3D electromagnetic devices. The procedu res work in the complex-frequency domain on either the finite element or bo undary element formulation of Maxwell's equations. Various approximation te chniques are used to derive reduced-order models describing the system tran sfer functions of the 3D device. Two different methods for evaluating reduc ed-order models are presented. One is called Asymptotic Waveform Evaluation (AWE) and is combined with the finite element method; the other is called Adaptive Lanzcos-Pade Sweep (ALPS) and is combined with the boundary elemen t method. The resulting reduced-order models provide the frequency domain b ehavior of the device over a broad bandwidth. Using the inverse Laplace tra nsform, these reduced-order models can also provide the time domain behavio r of the device. Several numerical examples have been run using commercial EDA software to demonstrate that this solution procedure is a highly effici ent and accurate way to characterize the electromagnetic performance of rea l-life devices. (C) 1999 Elsevier Science S.A. All rights reserved.