Three-dimensional CAD-based mesh generator for the Dey-Mittra conformal FDTD algorithm

Geoff Waldschmidt*, Allen Taflove

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


It is well-known that the finite-difference time-domain (FDTD) method is subject to significant errors due to the staircasing of surfaces that are not precisely aligned with major grid planes. Dey and Mittra introduced a locally conformal method (D-FDTD) that has shown substantial gains in the accuracy of modeling arbitrary surfaces in the FDTD grid. A mesh generator for this purpose was reported by Yu and Mittra. In this paper, we present the formulation and validation of an alternative CAD-based mesh generator for D-FDTD that has improved capabilities for arbitrary three-dimensional (3-D) perfect electric conductor (PEC) geometries. This mesh generator is capable of importing AutoCad and ProE files of 3-D PEC scatterers and resonators. It can reduce the required FDTD grid resolution by up to 4:1 in each Cartesian direction in 3-D relative to conventional staircased FDTD models when modeling cavity resonances of complex PEC structures such as twisted waveguides.

Original languageEnglish (US)
Pages (from-to)1658-1664
Number of pages7
JournalIEEE Transactions on Antennas and Propagation
Issue number7
StatePublished - 2004

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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