Dual-grid multiresolution technique for electrically large BoR-FDTD simulation
The dual-grid (DG) technique is implemented in the body-of-revolution FDTD algorithm (BoR-FDTD) for the fast analysis of large rotationally symmetric antennas. The proposed technique combines two BoR-FDTD simulations performed successively with fine and coarse mesh schemes, respectively. First, all...
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| Main Authors: | , , |
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| Format: | Article |
| Published: |
Wiley Periodicals, Inc.
2012
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1002/mop.26873 http://dx.doi.org/10.1002/mop.26873 http://eprints.uthm.edu.my/6095/1/DUAL%2DGRID_MULTIRESOLUTION.pdf |
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| Summary: | The dual-grid (DG) technique is implemented in the
body-of-revolution FDTD algorithm (BoR-FDTD) for the fast analysis of
large rotationally symmetric antennas. The proposed technique combines
two BoR-FDTD simulations performed successively with fine and coarse
mesh schemes, respectively. First, all excitation sources are analyzed
locally with a fine mesh resolution and the near-field distributions are
saved. Second, the whole problem (feeds and scatterers) is modeled
using a coarser mesh where the computational domain is excited by the
equivalent sources stored at the first stage. The continuity between these
two simulations is guarantied by means of linear field interpolation or
sampling (in space and time) and total/scattered field formulation. The
relevance of the proposed technique is demonstrated through the
analysis of a 60 x k0 parabolic antenna system illuminated by an
electromagnetic band gap feed. The DG technique is found to be
accurate and faster than the classical BoR-FDTD approach. Our results
also show that significant savings are obtained in terms of computation
time and memory. The DG-BoR-FDTD strategy is considered as a
powerful and flexible approach to analyze the influence of the
surrounding environments without having to repeat the expensive part of
the simulation. |
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