By Topic

A Nonorthogonal ADI-FDTD Algorithm for Solving Two Dimensional Scattering Problems

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Hong-Xing Zheng ; Inst. of Antenna & Microwave Tech., Tianjin Univ. of Technol. & Educ., Tianjin, China ; Kwok Wa Leung

In this paper, an alternating-direction implicit (ADI) scheme is applied to the finite-difference time-domain (FDTD) method for solving electromagnetic scattering problems in a generalized coordinate system. A formulation for two dimensional problems is presented and its numerical dispersion and stability property are discussed. In our generalized approach, the nonorthogonal grid is used to model the complex region of a scatterer only, whereas the standard FDTD lattice is used for the remaining regions. As a result, accurate griddings with a simple algorithm can be obtained using the new scheme, and the complexity of the algorithm is minimal. The perfectly matched layer (PML) is used to truncate the boundary. To illustrate the theory, a sinusoidal plane wave and a Gaussian pulse that propagates through a space modeled by locally nonorthogonal grids are used, with the stability of the code examined. The radar cross section of a perfectly conducting cylinder with a thin coating, a large curvature, and/or a sharp edge is calculated using the proposed method, and the result is compared with those using other conventional FDTD methods. It is found that the proposed algorithm is much more efficient than its FDTD counterpart when a complex object is analyzed.

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:57 ,  Issue: 12 )