The finite-difference time-domain (FDTD) method
has been widely and effectively used for analysis
in many kinds of electromagnetic problems.
Generally, the computational space can be divided
into many lattices with rectangular; and
the length on each of these meshs is equivalent
in unitary aspect. In some of those problems, a
greatly improved accuracy of the solution can be
obtained if a finer discretization is used in
specific regions of the computational space.
There are limitations of the present form of
uniform FDTD. It must increase the computational
cost (memory and CPU time). Concerning the
impression, we are trying to find more efficient
ways of utilizing nonuniform grids. Coarser mesh
for uncomplicated structure and finer mesh for
complicated structure in nonuniform grids.
However, this way can use in part of cutting area
only. There are two edges connects the truncation
of computational space. A similar scheme has been
used with nonuniform FDTD method by a
modification to the mesh scheme. The subcell
method is a very general approach, capable of
analyzing arbitrarily-shaped structures. In local
area the mesh change from rectangular to
irregular. Subgridding method is dissimilar to
the both methods. Furthermore, the anisotropic
PML to decrease the electromagnetic wave from
nonuniform mesh of the computational space. It
have replaced Mur¡¦s first-order absorbing
boundary conditions and Berenger¡¦s PML for
improving computationally efficient. Finally,
compare them with the anisotropic PML in the
essay.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0626100-094121 |
| Date | 26 June 2000 |
| Creators | Lin, Ming-Cun |
| Contributors | Tzong-Lin Wu, Ken-Huang Lin, Chih-Wen Kuo |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0626100-094121 |
| Rights | off_campus_withheld, Copyright information available at source archive |
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