TIME-DOMAIN EM INTERACTION ANALYSIS

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Authors
  1. Chamma, W.A.
  2. Shafai, L.
  3. Barakat, M.
Corporate Authors
InfoMagnetics Technologies Corp, Winnipeg MAN (CAN);Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
In this work, further development of the Finite-Difference Time-Domain (FDTD) code is implemented to model accurately and efficiently complex structures, as well as, to improve on the FDTD capability to analyze additional electromagnetic applications that are of interest to the Scientific Authority. The investigation on the use of non-uniform mesh in a FDTD lattice is continued, where a second-order accurate central-difference scheme in a non-uniform grid is introduced to replace the one which assumes the fields to be at equally spaced nodes. This scheme is initially investigated on a one-dimensional FDTD algorithm. Also, the performance of this procedure is investigated in a three-dimensional non-uniform FDTD lattice. Various non-uniform meshing schemes are examined to compute the field response inside a conducting box with an open top illuminated by the New-NATO EMP. These meshing schemes provided accurate field responses and less computer storage than those of a uniform mesh. Also in this work, the inclusion of a Radar Cross Section (RCS) computing capability in the present developed FDTD is implemented. To validate this capability, RCS information of various perfectly conducting and dielectric objects is computed and compared with benchmark data. Finally a modeling procedure adopted for implementing the modeling of thin surface coatings in the FDTD code is introduced.
Keywords
Time domain;Finite difference
Report Number
DREO-CR-94-657 — Contractor Report
Date of publication
01 Mar 1993
Number of Pages
94
DSTKIM No
95-00847
CANDIS No
149046
Format(s):
Hardcopy;Document Image stored on Optical Disk

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