High‐order finite‐element analysis of periodic absorbers

Abstract

A high‐order vector finite‐element‐method (FEM) analysis of periodic absorbers is presented. By the virtue of the FEM, accurate modeling of complicated absorber structures is made possible. For a given accuracy, high‐order elements are used to reduce the number of unknowns and hence the computing time and memory consumption. The FEM is further combined with the asymptotic waveform evalaution (AWE) technique to produce fast‐frequency sweep. Both singly and doubly periodic absorbers are modeled and the accuracy of the method is demonstrated by comparisons with analytical solutions and published data. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 37: 203–207, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10869

Faster 3D finite element time domain – Floquet absorbing boundary condition modelling using recursive convolution and vector fitting

“…The shift, in Fig.8 between our results and those of [1] and CST, at low frequencies, is not due to the RC but to the FE spatial discretisation accuracy, i.e. more accurate results are expected if the mesh is refined and higher order elements are employed [21,22]. In [23] (page 392) a similar shift is obtained between two sets of results when modeling a similar structure.…”

“…Furthermore, for a given number of finite elements, more accurate results are obtained by using higher order elements. This is illustrated in references [21,22].…”

Higher Order Finite Element Analysis of Finite-by-Infinite Arrays

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