SFELP: a hybrid 3D-finite elements/segmentation method with fast frequency sweep based on the SyMPVL algorithm for the analysis of passive microwaves circuits

The segmentation technique has been widely used for the full-wave analysis of microwave circuits to reduce CPU time and memory requirements. When this technique is implemented by linking multimode and multiport matrices of the different regions in which the circuit is divided, these matrices must be obtained for a great number of frequencies if a broad band analysis is required. In this paper, it is the SFELP method (segmentation/finite elements/Lanczos-Pade) is introduced. This method applies the symmetric Pade via Lanczos algorithm (SyMPVL) to a 3D-finite elements/segmentation method (3D-FE/SM) for obtaining a reduced order model of the transfer function of each region in which a 3D analysis is used. The result for each region is the multimode multiport generalized admittance matrix (GAM) on a wide band of frequencies from which the generalized scattering matrix (GSM) is computed. Then, the global response of the circuit can be immediately obtained by connecting the partial GSMs.