Hybrid thin-slot algorithm for the analysis of narrow apertures in finite-difference time-domain calculations
The modeling of apertures that are narrow with respect to the spatial cell size is a well-known problem for finite-difference time-domain (FDTD) electromagnetic codes. Although the possibility of using half-space'' transient integral equations to characterize narrow apertures in FDTD codes has been suggested and studied by others, a solution to the fundamental problem of how the two techniques could be combined so that full coupling to the aperture is accounted for was unknown. A scheme which resolves this problem is presented here. To introduce the technique, only linear apertures that are electrically narrow with regard to both their width and depth are discussed, but extensions to more complex aperture configurations should be possible. The method incorporates an independent time-marching'' solution for the aperture problem into the FDTD code, and therefore, the burden of gridding the aperture by a general-purpose FDTD code is avoided. A feedback scheme is used so that full exterior and interior coupling is included in the aperture solution. This hybrid thin-slot algorithm'' (HTSA) is quite easy to implement, yields high accuracy, and gives rise to a one-step'' FDTD solution. 15 refs., 13 figs.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- DOE/DP
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 7070223
- Report Number(s):
- SAND-89-3073; ON: DE90005823
- Country of Publication:
- United States
- Language:
- English
Similar Records
General implementation of thin-slot algorithms into the finite-difference time-domain code, TSAR, based on a slot data file
Modeling arbitrarily directed slots that are narrow both in width and depth with regard to the FDTD spatial cell
Related Subjects
42 ENGINEERING
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
ELECTROMAGNETIC PULSES
COMPUTERIZED SIMULATION
NUCLEAR EXPLOSIONS
ACCURACY
ALGORITHMS
ANTENNAS
APERTURES
COMPARATIVE EVALUATIONS
F CODES
FEEDBACK
FREQUENCY ANALYSIS
H CODES
IMPLEMENTATION
MEASURING METHODS
RESCATTERING
SCATTERING
STRUCTURAL MODELS
TIME DEPENDENCE
TWO-DIMENSIONAL CALCULATIONS
COMPUTER CODES
ELECTRICAL EQUIPMENT
ELECTROMAGNETIC RADIATION
EQUIPMENT
EXPLOSIONS
MATHEMATICAL LOGIC
OPENINGS
PULSES
RADIATIONS
SIMULATION
450200* - Military Technology
Weaponry
& National Defense- Nuclear Explosions & Explosives
426000 - Engineering- Components
Electron Devices & Circuits- (1990-)
990200 - Mathematics & Computers