Accurate plane-wave excitation in the FDTD method
Date
1997
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Source Title
Proceedings of the Antennas and Propagation Society International Symposium, IEEE 1997
Print ISSN
0272-4693
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IEEE
Volume
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Pages
2164 - 2167
Language
English
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Abstract
Different techniques are developed to implement plane-wave excitation on the finite-difference time-domain (FDTD) method, such as the initial-condition, the hard-source, and the connecting-condition techniques, for the total-field/scattered field (TF/SF) formulation. In the TF/SF formulation, the incident field is computed and fed to the 3D FDTD grid on the boundary separating the total-field and the scattered-field regions. Since the incedent field is a known quantity, a closed-form expression can be evaluated on every point of this boundary. A more efficient way of computing the incedent field is by using an incedent-field array (IFA), which is a 1D FDTD grid set-up to numerically propagate the incedent field into the 3D FDTD.
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Keywords
Boundary conditions , Electric fields , Electromagnetic wave propagation , Finite difference method , Interpolation , Time domain analysis , Absorbing boundary conditions (ABC) , Finite difference time domain (FDTD) technique , Incedent field array (IFA) , Total field/scattered field (TF/SF) formulation , Electromagnetic wave scattering