FDTD dispersion revisited: Faster-than-light propagation

被引：57

作者：

Schneider, JB ^{[1
]}

Wagner, CL ^{[1
]}

机构：

[1] Washington State Univ, Sch Elect & Comp Sci, Pullman, WA 99164 USA

来源：

IEEE MICROWAVE AND GUIDED WAVE LETTERS | 1999年 / 9卷 / 02期

关键词：

FDTD methods;

D O I：

10.1109/75.755044

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：

The numerical dispersion relation that governs the propagation of fields in a finite-difference time-domain (FDTD) grid was derived several years ago. In this letter a different interpretation is given for the governing equation. It is shown that the dispersion relation predicts faster-than-light propagation for coarsely resolved fields. Additionally, some spectral components that were previously believed to have zero phase velocity are shown to propagate, albeit with exponential decay.

引用

页码：54 / 56

页数：3