A quasi-planar incident wave excitation for time-domain scattering analysis of periodic structures

被引:0
作者
Degerfeldt, David [1 ]
Hallerod, Tomas
Emilsson, Borje
Bondeson, Anders
Rylander, Thomas
机构
[1] Chalmers Univ Technol, Computat Technol Grp, Dept Appl Mech, SE-41296 Gothenburg, Sweden
[2] SAAB Bofors Dynam AB, SE-40251 Gothenburg, Sweden
关键词
periodic structures; Huygen's surface; time-domain methods; random rough surface;
D O I
10.1002/jnm.619
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
We present a quasi-planar incident wave excitation for time-domain scattering analysis of periodic Structures. It uses a particular superposition of plane waves that yields an incident wave with the same periodicity as the periodic structure itself. The duration of the incident wave is controlled by means of its frequency spectrum or, equivalently, the angular spread in its constituting plane waves. Accuracy and convergence properties of the method are demonstrated by scattering computations for a planar dielectric half-space. Equipped with the proposed source, a time-domain solver based on linear elements yields an error of roughly 1% for a resolution of 20 points per wavelength and second-order convergence is achieved for smooth scatterers. Computations of the scattering characteristics for a sinusoidal surface and a random rough surface show similar performance. Copyright (c) 2006 John Wiley & Sons, Ltd.
引用
收藏
页码:409 / 419
页数:11
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