Copyright © 2022, IEEECabello, M. R.Martín Valverde, A. J.Plaza Gallardo, B.Frövel, M.Poyatos Martínez, D.Rubio Bretones, A.González García, S.2023-03-082023-03-082022-07-08International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimizationhttps://ieeexplore.ieee.org/document/10038947http://hdl.handle.net/20.500.12666/854The finite-difference time-domain (FDTD) method is not able to efficiently model thin features without a drastic reductions of the spatial mesh size, potentially yielding an unfeasible use of memory and CPU requirements. In this work we propose two stable and efficient techniques for dealing with thin apertures in FDTD, one based on conformal and one based on subgridding. These are compared, in two different scenarios, with the classical dispersive magnetic material approximation [DMMA] based on Gilbert-Holland's models.engSmall aperturesFinite difference time domainSubgriddingElectromagnetic compatibilityinfo:eu-repo/semantics/article10.1109/NEMO51452.2022.100389479781665486330info:eu-repo/semantics/restrictedAccess