Modeling sources in the FDTD formulation and their use in quantifying source and boundary condition errors

Author

Buechler, Dale N. ; Roper, Daniel H. ; Durney, Carl H. ; Christensen, Douglas A.

Author_Institution

Dept. of Electr. Eng., Utah Univ., Salt Lake City, UT, USA

Volume

43

Issue

4

fYear

1995

fDate

4/1/1995 12:00:00 AM

Firstpage

810

Lastpage

814

Abstract

The modeling of voltage and current sources as either added or replaced sources in FDTD simulations is described and their differences discussed in terms of a transmission line analogy. An infinitesimal current element (ICE) is used to illustrate the validation of added source modeling and to study the errors involved with modeling an infinitesimal element within the finite-sized FDTD grid. This model is also used to illustrate the behavior of radiation boundary conditions as their near-field position with respect to the source is varied. We characterize the errors due to modeling and boundary conditions and give guidelines for obtaining acceptable accuracy in simulations

Keywords

boundary-value problems; errors; finite difference time-domain analysis; transmission line theory; FDTD simulations; boundary condition errors; current sources; finite-sized FDTD grid; modeling; radiation boundary conditions; transmission line analogy; voltage sources; Antenna radiation patterns; Biomedical engineering; Boundary conditions; Cities and towns; Dipole antennas; Finite difference methods; Guidelines; Ice; Time domain analysis; Voltage;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.375228

Filename

375228