Abstract
We extend the generalized total-field/scattered-field formulation of the finite-difference time-domain method to permit efficient computational modeling of three-dimensional (3-D) diffraction by infinite conducting and dielectric wedges. This new method allows: 1) sourcing a numerical plane wave having an arbitrary incident angle traveling into, or originating from, a perfectly matched layer absorbing boundary and 2) terminating the infinite wedge inside the perfectly matched layer with negligible reflection. We validate the new method by comparing its results with the analytical diffraction coefficients for an infinite 3-D right-angle perfect electric conductor wedge obtained using the uniform theory of diffraction. Then, we apply the new method to calculate numerical diffraction coefficients for a 3-D infinite right-angle dielectric wedge, covering a wide range of incident and scattering angles. Finally, we show means to compactly store the calculated diffraction coefficients in a manner which permits easy interpolation of the results for arbitrary incidence and observation angles.
Original language | English (US) |
---|---|
Pages (from-to) | 1444-1454 |
Number of pages | 11 |
Journal | IEEE Transactions on Antennas and Propagation |
Volume | 53 |
Issue number | 4 |
DOIs | |
State | Published - Apr 2005 |
Funding
Manuscript received June 22, 2004; revised October 6, 2004. This work was performed under a grant from Motorola, Incorporated, Schaumburg, IL, to the Motorola/Northwestern University Center for Communications. The authors are with the Department of Electrical and Computer Engineering, Northwestern University, Evanston, IL 60208 USA (e-mail: [email protected]). Digital Object Identifier 10.1109/TAP.2005.846359
Keywords
- Diffraction
- Finite-difference time-domain (FDTD) method
- Wedges
ASJC Scopus subject areas
- Electrical and Electronic Engineering