Hybrid Newmark-conformal FDTD modeling of thin spoof plasmonic metamaterials

Fujita, Kazuhiro

doi:10.1016/j.jcp.2018.09.050

Cited by 6 publications

(1 citation statement)

References 41 publications

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“…Aiming to reduce the error insertion because of FDTD's mesh staircase, the proposal modifies the field update equations locally in a simple and efficient manner, implying straightforward application with low computational cost. It is an advantageous approach, widely known because of its practicality and efficiency, being commonly used in FDTD simulations improvement, as seen in relevant works (Fujita, 2019;Khosravi et al, 2016;Yuan et al, 2014;Cabello et al, 2016;Dai et al, 2011;Junkin, 2011) in the recent years. As any approximated technique, the approach presents limitations, some of these are researched previously (Nieter et al, 2009;Bauer et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Wideband performance limitations of the C-FDTD in the discretization impoverishment of a curved surface

Fortes

Gonçalves

2020

COMPEL

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Purpose This paper aims to explore the limitations of the conformal finite difference time-domain method (C-FDTD or Dey–Mittra) when modeling perfect electric conducting (PEC) and lossless dielectric curved surfaces in coarse meshes. The C-FDTD is a widely known approach to reduce error of curved surfaces in the FDTD method. However, its performance limitations are not broadly described in the literature, which are explored as a novelty in this paper. Design/methodology/approach This paper explores the C-FDTD method applied on field scattering simulations of two curved surfaces, a dielectric and a PEC sphere, through the frequency range from 0.8 to 10 GHz. For each sphere, the mesh was progressively impoverished to evaluate the accuracy drop and performance limitations of the C-FDTD with the mesh impoverishment, along with the wideband frequency range described. Findings This paper shows and quantifies the C-FDTD method’s accuracy drops as the mesh is impoverished, reducing C-FDTD’s performance. It is also shown how the performance drops differently according to the frequency of interest. Practical implications With this study, coarse meshes, with smaller execution time and reduced memory usage, can be further explored reliably accounting the desired accuracy, enabling a better trade-off between accuracy and computational effort. Originality/value This paper quantifies the limitations of the C-FDTD in coarse meshes in a wideband manner, which brings a broader and newer insight upon C-FDTD’s limitations in coarse meshes or relatively small objects in electromagnetic simulation.

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