The analysis of shielding enclosures is complicated by the existence of apertures and cables. The finite-difference time-domain (FDTD) method can model shielding enclosures with complex geometries, but has difficulty modeling wires and cables of arbitrary radii. Modeling the wire by setting the axial component of the electric field to zero in the FDTD results in a wire with a radius determined by the mesh discretisation. Neglecting wire radius in applications such as electromagnetic interference (EMI) or printed circuit board modeling may result in gross errors because near field quantities are typically sensitive to wire thickness. Taflove (1990) developed a wire modeling algorithm for FDTD analysis which models wires well for far-field calculations such as the radar cross section. The method uses a quasi-static field approximation to model wires with a user-specified radius. The wire model is reviewed and investigated for near-field accuracy via input impedance computations, since FCC class A and B regulations are tested in the near field. The input impedance for a center-fed dipole antenna is computed with FDTD methods and compared to the input impedance results from moment methods. A simulation of a shielding enclosure with an attached cable demonstrates the utility of FDTD analysis in EMC applications.
D. M. Hockanson et al., "FDTD Modeling of Thin Wires for Simulating Common-Mode Radiation from Structures with Attached Cables," Proceedings of the IEEE International Symposium on Electromagnetic Compatibility (1995, Atlanta, GA), pp. 168-173, Institute of Electrical and Electronics Engineers (IEEE), Aug 1995.
The definitive version is available at http://dx.doi.org/10.1109/ISEMC.1995.523540
IEEE International Symposium on Electromagnetic Compatibility (1995: Aug. 14-18, Atlanta, GA)
Electrical and Computer Engineering
Electromagnetic Compatibility (EMC) Laboratory
Keywords and Phrases
EMC; EMI; FDTD Modeling; Antenna Feeds; Apertures; Approximation Theory; Cables; Cables (Electric); Center-Fed Dipole Antenna; Common-Mode Radiation Simulation; Digital Simulation; Dipole Antennas; Electric Field; Electric Impedance; Electromagnetic Compatibility; Electromagnetic Interference; Electromagnetic Shielding; Far-Field Calculations; Finite Difference Time-Domain Analysis; Finite-Difference Time-Domain; Input Impedance; Mesh Discretisation; Moment Methods; Near-Field Accuracy; Packaging; Printed Circuit Board Modeling; Quasistatic Field Approximation; Radar Cross Section; Radar Cross-Sections; Shielding Enclosures; Simulation; Thin Wires; Wire Modeling Algorithm; Wire Radius; Wire Thickness; Wires (Electric)
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Article - Conference proceedings
© 1995 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.