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Reduced-order modeling of multiscreen frequency-selective surfaces using Krylov-based rational interpolation

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3 Author(s)
Weile, Daniel S. ; Dept. of Electr. & Comput. Eng., Delaware Univ., Newark, DE, USA ; Michielssen, E. ; Gallivan, K.

A method is presented for generating a broad-band rational interpolant approximation of the reflection coefficient of multiple-screen frequency-selective surfaces (FSSs). The technique is structured around a linearization of the system provided by a spectral domain moment method-based analysis of the FSS, followed by a model-order reduction of the linearized system using the dual rational Arnoldi method. This process creates a rational interpolant of the linearized system that matches its transfer function and its derivatives at several expansion points in the Laplace domain. Numerical results indicate that a reduced-order model with a system matrix of dimension less than 20×20 can accurately reproduce the broad-band behavior of multiscreen FSSs originally modeled with several hundreds or thousands of unknowns

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Antennas and Propagation, IEEE Transactions on  (Volume:49 ,  Issue: 5 )