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openEMS – a free and open source equivalent‐circuit (EC) FDTD simulation platform supporting cylindrical coordinates suitable for the analysis of traveling wave MRI applications
Author(s) -
Liebig Thorsten,
Rennings Andreas,
Held Sebastian,
Erni Daniel
Publication year - 2012
Publication title -
international journal of numerical modelling: electronic networks, devices and fields
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.249
H-Index - 30
eISSN - 1099-1204
pISSN - 0894-3370
DOI - 10.1002/jnm.1875
Subject(s) - finite difference time domain method , conformal map , context (archaeology) , cylindrical coordinate system , singularity , acoustics , computer science , ring (chemistry) , physics , equivalent circuit , mathematical analysis , topology (electrical circuits) , electronic engineering , geometry , mathematics , optics , engineering , electrical engineering , geology , voltage , paleontology , chemistry , organic chemistry
SUMMARY In this paper, we present a free and open source platform by using the equivalent‐circuit finite‐difference time‐domain (FDTD) method adapted to cylindrical coordinates to efficiently model cylindrically shaped objects. We will address the special characteristics of a cylindrical FDTD mesh such as the mesh singularity at r = 0 and discuss how cylindrical subgrids for small radii can reduce the simulation time considerably. Furthermore, we will demonstrate the applicability and advantages of this cylindrical equivalent‐circuit FDTD method to evaluate new types of conformal ring antennas used in the context of high‐field (7T) traveling wave magnetic resonance imaging (MRI). Copyright © 2012 John Wiley & Sons, Ltd.