An Accurate Method for FD-TD Plane Wave Propagation for Wide Band Excitations
Abstract
An accurate and efficient technique is presented for propagating wide band plane waves in a three-dimensional (3-D) finite difference time domain (FD-TD) grid. Commonly, the incident pulse is created via a separate, one dimensional auxiliary field grid and then applied to the 3-D grid. Although this paper focuses on the separate field formalism, the method can be applied to the scattered field formalism as well. As the wave is applied, a 3-D numerical wave is excited and propagates. If the wave number band of the auxiliary field grid is not nearly equal to that of the 3-D numerical wave, eaor accumulates resulting in inaccurate results. However, by reconstructing the auxiliary field grid, its wave number band can be closely matched to that of the 3-D numerical wave yielding a much higher fidelity propagating plane wave.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 14, 1999
- Accession Number
- ADA382949
Entities
People
- David Dietz
- Jeff T. Macgillivray
Organizations
- Air Force Research Laboratory