Use of the FDTD thin-strut formalism for biomedical telemetry coil designs

The finite-difference time-domain (FDTD) method extended by thin-strut formalism was used to study the current coupling between rectangular coils for use in biomedical telemetry links. Further, a new stability condition, different from the Courant-Friedrichs-Lewy stability limit, was derived for the thin-strut method. Results obtained for varying coil sizes and distances of separation show that the thin-strut FDTD formulation, applied to the calculation of current coupling between telemetry coils, is in closer agreement to the analytical approximation than is the standard FDTD code. These results indicate that the thin-strut method is a promising method for the study and the design of coils for telemetry links between implantable and external devices.

[1]  Richard Holland,et al.  Finite-Difference Analysis of EMP Coupling to Thin Struts and Wires , 1981, IEEE Transactions on Electromagnetic Compatibility.

[2]  Miko Elwenspoek,et al.  Characterization of a planar microcoil for implantable microsystems , 1997 .

[3]  R. D. Richtmyer,et al.  Difference methods for initial-value problems , 1959 .

[4]  Osama A. Mohammed,et al.  Electromagnetic field modeling of implantable telemetry systems , 1985 .

[5]  Dennis M. Sullivan,et al.  An unsplit step 3-D PML for use with the FDTD method , 1997 .

[6]  G. Smith,et al.  Numerical Solution of Partial Differential Equations: Finite Difference Methods , 1978 .

[7]  C.M. Zierhofer,et al.  Geometric approach for coupling enhancement of magnetically coupled coils , 1996, IEEE Transactions on Biomedical Engineering.

[8]  N. de N. Donaldson,et al.  Analysis of resonant coupled coils in the design of radio frequency transcutaneous links , 1983, Medical and Biological Engineering and Computing.

[9]  F. C. Flack,et al.  Mutual inductance of air-cored coils: Effect on design of radio-frequency coupled implants , 1971, Medical and biological engineering.

[10]  Allen Taflove,et al.  Computational Electrodynamics the Finite-Difference Time-Domain Method , 1995 .

[11]  Mani Soma,et al.  Radio-Frequency Coils in Implantable Devices: Misalignment Analysis and Design Procedure , 1987, IEEE Transactions on Biomedical Engineering.

[12]  Klaus Finkenzeller,et al.  Book Reviews: RFID Handbook: Fundamentals and Applications in Contactless Smart Cards and Identification, 2nd ed. , 2004, ACM Queue.

[13]  김덕영.  [신간안내] Computational Electrodynamics (the finite difference time - domain method) , 2001 .

[14]  F. Issac,et al.  Stability analysis including wires of arbitrary radius in FD-TD code , 1993, Proceedings of IEEE Antennas and Propagation Society International Symposium.

[15]  R. White,et al.  A Wide-Band Efficient Inductive Transdennal Power and Data Link with Coupling Insensitive Gain , 1987, IEEE Transactions on Biomedical Engineering.