Title :
A new technique for accurate and stable modeling of arbitrarily oriented thin wires in the FDTD method
Author :
Edelvik, Fredrik
Author_Institution :
Dept. of Inf. Technol., Sci. Comput., Uppsala Univ., Sweden
fDate :
5/1/2003 12:00:00 AM
Abstract :
A subcell model for thin wires in the finite-difference time-domain method using modified telegraphers equations has been developed by Holland et al. (1981). In this paper, we present an extension of their algorithm, which allows arbitrarily located and oriented wires with respect to the Cartesian grid. This is important to be able to accurately model wires that cannot be aligned to the Cartesian grid, e.g., tilted wires and circular loop wires. A symmetric coupling between field and wires yields a stable time-continuous field-wire system and the fully discrete field-wire system is stable under a Courant-Friedrich-Lewy (CFL) condition. The accuracy and excellent consistency of the proposed method are demonstrated for dipole and loop antennas with comparisons with the method of moments and experimental data.
Keywords :
Maxwell equations; antenna theory; dipole antennas; electromagnetic compatibility; electromagnetic shielding; finite difference time-domain analysis; loop antennas; modelling; numerical stability; wire antennas; wires (electric); Cartesian grid; Courant-Friedrich-Lewy condition; EMC; FDTD method; arbitrarily located wires; arbitrarily oriented thin wires; arbitrarily oriented wires; circular loop wires; dipole antennas; field/wires coupling; fully discrete field-wire system; loop antennas; modified telegraphers equations; stable modeling; stable time-continuous field-wire system; subcell model; symmetric coupling; tilted wires; Conductivity; Dipole antennas; Finite difference methods; Finite element methods; Helium; Maxwell equations; Moment methods; Scientific computing; Time domain analysis; Wires;
Journal_Title :
Electromagnetic Compatibility, IEEE Transactions on
DOI :
10.1109/TEMC.2003.811294