The approximate modal interface—solution space projection method including internal ports for efficient finite-element analysis of multilayer printed circuits

The approximate modal interface—solution space projection (AMI-SSP) [1] is a combined domain decomposition—model order reduction (DD-MOR) algorithm for efficient broadband simulation of multilayer printed circuits. The AMI method solves each layer of a circuit board independently and reduces the problem to a global interface system which couples all the layers. The mesh of each layer can be generated and refined independently without being consistent at a subdomain interface. In the AMI-SSP algorithm, SSP [2] is first performed in each layer to generate reduced-order models, with which the AMI computation is accelerated significantly and a fast frequency sweep is achieved.