Locally non-uniform finite-difference time domain with application to stealth, crosstalk, and narrow apertures
A technique to integrate a dense, locally non-uniform mesh into finite-difference time-domain (FDTD) codes is presented. The method is designed for the full-wave analysis of multi-material layers that are physically thin, but perhaps electrically thick. Such layers are often used for the purpose of suppressing electromagnetic reflections from conducting surfaces. Throughout the non-uniform local mesh, average values for the conductivity and permittivity are used, where as variations in permeability are accommodated by splitting H-field line integrals and enforcing continuity of the normal B field. A unique interpolation scheme provides accuracy and late-time stability for mesh discontinuities as large as 1000 to 1. Application is made to resistive sheets, the absorbing Salisbury screen, crosstalk on printed circuit boards, and apertures that are narrow both in width and depth with regard to a uniform cell. Where appropriate, comparisons are made with the MoM code CARLOS and transmission-line theory. The hybrid mesh formulation has been highly optimized for both vector and parallel-processing on Cray YMP architectures.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6420915
- Report Number(s):
- SAND-93-0735; ON: DE93013958
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ELECTROMAGNETIC RADIATION
F CODES
COMPUTER CALCULATIONS
FINITE DIFFERENCE METHOD
MESH GENERATION
PARALLEL PROCESSING
PERMITTIVITY
WAVE PROPAGATION
CALCULATION METHODS
COMPUTER CODES
ITERATIVE METHODS
NUMERICAL SOLUTION
PROGRAMMING
RADIATIONS
990200* - Mathematics & Computers
661300 - Other Aspects of Physical Science- (1992-)