Despite continual advances in computing power and the emergence of very efficient algorithms, rigorous analysis of many electrodynamic devices is still often computationally prohibitive. To help overcome these obstacles, a considerable amount of research into so-called "model order reduction" (MOR) methods has been conducted in both the circuit and electromagnetic communities. Traditionally, nonlinearities are dealt with by partitioning the system into linear and nonlinear sub-blocks, and applying MOR techniques to the linear sub-blocks. In systems where the nonlinearity is distributed, however, this is not possible. A method for accomplishing MOR in such cases is described. The theoretical basis for the method is discussed, choices which must be made in implementation are highlighted, and the analysis of a pulse-compression nonlinear transmission line is carried out to demonstrate the capability of the scheme.
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