DocumentCode :
1438771
Title :
Keeping Time with Maxwell´s Equations
Author :
Songoro, Harald ; Vogel, Martin ; Cendes, Zoltan
Author_Institution :
Ansoft LLC, Pittsburgh, PA, USA
Volume :
11
Issue :
2
fYear :
2010
fDate :
4/1/2010 12:00:00 AM
Firstpage :
42
Lastpage :
49
Abstract :
Introducing a commercial FETD solver breaks new ground in EM field simulation. Based on the DGTD method, it allows unstructured geometry-conforming meshes to be used for the first time in transient EM field simulation. Since the underlying method doesn´t require the solution of a large matrix equation, its computer memory usage is modest. Simulation speed is optimized without compromising accuracy or stability by introducing an innovative local timestepping procedure. In this procedure, small time steps are taken only where needed in small mesh elements while appropriately larger time steps are used in larger mesh elements. Furthermore, a local implicit time-stepping algorithm is employed with selected elements to further improve simulation speed. DGTD is a competitive alternative to traditional FDTD-based methods to solving Maxwell´s equations in the time domain. The applications presented here include the electromagnetic pulse susceptibility of the differential lines in a laptop computer, the radar signature of a landmine under undulating ground,the TDR of a bent flex circuit, and the return loss of a connector. All of these examples involve complicated/ curved geometries where the flexibility of the unstructured meshes used in DGTD provides powerful advantages over simulation by conventional brickshaped FDTD and FIT meshes.
Keywords :
Galerkin method; Maxwell equations; computational electromagnetics; electromagnetic fields; electromagnetic pulse; finite difference time-domain analysis; finite element analysis; DGTD method; FDTD-based methods; FETD solver; FIT mesh; Maxwell equations; bent flex circuit; connector return loss; discontinuous Galerkin time-domain methods; electromagnetic pulse susceptibility; finite difference time-domain method; finite element time-domain methods; finite integration technique; landmine; laptop computer; local implicit time-stepping algorithm; matrix equation; radar signature; transient EM field simulation; unstructured geometry-conforming meshes; Application software; Circuit simulation; Computational modeling; EMP radiation effects; Finite element methods; Maxwell equations; Portable computers; Solid modeling; Stability; Time domain analysis;
fLanguage :
English
Journal_Title :
Microwave Magazine, IEEE
Publisher :
ieee
ISSN :
1527-3342
Type :
jour
DOI :
10.1109/MMM.2010.935779
Filename :
5430412
Link To Document :
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