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A new technique for the stable incorporation of static field solutions in the FDTD method for the analysis of thin wires and narrow strips

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2 Author(s)
Craddock, I.J. ; Centre for Commun. Res., Bristol Univ., UK ; Railton, C.J.

The behavior of the fields around many common objects (e.g., wires, slots, and strips) converges to known static solutions. Incorporation of this a priori knowledge of the fields into the finite-difference time-domain (FDTD) algorithm provides one method for obtaining a more efficient characterization of these structures. Various methods of achieving this have been attempted; however, most have resulted in unstable algorithms. Recent investigations into the stability of FDTD have yielded criteria for stability, and this contribution for the first time links these criteria to a general finite-element formulation of the method. It is shown that the finite-element formulation provides a means by which FDTD may be generalized to include whatever a priori knowledge of the field is available, without compromising stability. Example results are presented for extremely narrow microstrip lines and wires

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:46 ,  Issue: 8 )