@misc{10481/50236,
year = {2018},
url = {http://hdl.handle.net/10481/50236},
abstract = {Thin-sheet  models  are  essential  to  allow  shielding
effectiveness of composite enclosures and vehicles to be modeled.
Thin dispersive sheets are often modeled using surface-impedance
models in finite-difference time-domain (FDTD) codes in order to
deal efficiently with the multiscale nature of the overall structure.
Such boundary conditions must be applied to collocated tangen-
tial electric and magnetic fields on either side of the surface; this
is usually done on the edges of the FDTD mesh cells at the electric
field  sampling  points.  However,  these  edge-based  schemes  are
difficult  to  implement  accurately  on  stair-cased  surfaces.  Here,
we  present  a  novel  face-centered  approach  to  the  collocation  of
the  fields  for  the  application  of  the  boundary  condition.  This
approach  naturally  deals  with  the  ambiguities  in  the  surface
normal  that  arise  at  the  edges  on  stair-cased  surfaces,  allowing
a  simpler  implementation.  The  accuracy  of  the  new  scheme  is
compared  to  edge-based  and  conformal  approaches  using  both
planar sheet and spherical shell canonical test cases. Staircasing
effects are quantified and the new face-centered scheme is shown
have  up  to  3-dB  lower  error  than  the  edge-based  approach  in
the cases  considered, without the complexity and computational
cost of  conformal  techniques.},
organization = {This  work
was  supported  by  the  U.K.  Engineering  and  Physical  Sciences  Research
Council   through   the  Flapless   Air  Vehicle   Integrated   Industrial   Research
Programme under Grant GR/S71552/01, in part by the European Community’s
Seventh  Framework   Programme
under  Grant  FP7/2007-2013,   in  part  by
the  High  Intensity  Radiated  Field  Synthetic  Environment  Research  Project
under  Grant  205294,  in  part  by  the  Spa
nish  MINECO,  EU  FEDER  under
Project  TEC2013-48414-C3-01  and  Project  TEC2016-79214-C3-3-R,  and  in
part by J. de Andalucia, Spain under Project P12-TIC-1442},
publisher = {IEEE},
keywords = {Finite-difference time domain},
keywords = {Impedance network boundary condition},
keywords = {Surface-impedance boundary condition},
title = {Face-Centered Anisotropic Surface Impedance Boundary Conditions in FDTD},
doi = {10.1109/TMTT.2017.2778059},
author = {Flintoft, Ian and Bourke, Samuel and Dawson, John and Alvarez Gonzalez, Jesus and Ruiz Cabello, Miguel and Robinson, M. P. and González García, Salvador},
}