An improved finite-difference time-domain (FDTD) method is proposed for predicting transient responses of coaxial cables which are placed in an electrically large metallic cabin with arbitrary slots and circular windows on its wall. By integrating nodal analysis, multi-conductor transmission line (MTL) equation and FDTD method, we are able to accurately capture electromagnetic interference (EMI) effects on the cables. Our developed algorithm is verified by calculating frequency-dependent transfer impedance of coaxial cables together with induced currents. Numerical calculations are further performed to show the near-end coupled current responses of braided and tubular cables, respectively, and the effects of incident directions and polarizations of the illuminated electromagnetic pulse are both taken into account.
2. Bayram, Y. and J. L. Volakis, "A generalized MOM-SPICE iterative technique for field coupling to multiconductor tranmission lines in presence of complex structures," IEEE Trans. Electromagn. Compat., Vol. 47, No. 2, 234-246, May 2005.
3. Trakadas, P. T. and C. N. Capsalis, "Validation of a modified FDTD method on non-uniform transmission lines," Progress In Electromagnetics Research, Vol. 31, 311-329, 2001.
4. Bagci, H., A. E. Yilmaz, J. M. Jin, and E. Michielssen, "Fast and rigorous analysis of EMC/EMI phenomena on electrically large and complex cable loaded structure," IEEE Trans. Electromagn. Compat., Vol. 49, No. 2, 361-381, May 2007.
5. Ferrieres, X., J.-P. Paramantier, S. Bertuol, and A. R. Ruddle, "Application of a hybrid finite difference/finite volume method to solve an automotive EMC problem," IEEE Trans. Electromagn. Compat., Vol. 46, No. 4, 624-634, Nov. 2004.
6. Khalaj-Amirhosseini, M., "Analysis of nonuniform transmission lines using the equivalent sources," Progress In Electromagnetics Research, Vol. 71, 95-107, 2007.
7. Trakadas, P. T., P. J. Papakanellos, and C. N. Capsalis, "Probabilistic response of a transmission line in a dissipative medium excited by an oblique plane wave," Progress In Electromagnetics Research, Vol. 33, 45-68, 2001.
8. Camp, M., H. Gerth, H. Garbe, and H. Haase, "Predicting the breakdown behavior of microcontrollers under EMP/UWB impact using a statistical analysis," IEEE Trans. Electromagn. Compat., Vol. 46, No. 3, 368-379, Aug. 2004.
9. Dey, S. and R. Mittra, "A locally conformal finite-difference time-domain (FDTD) algorithm for modeling three-dimensional perfectly conducting objects," IEEE Microwave Guided Wave Lett., Vol. 7, 273-275, Sep. 1997.
10. Hu, X.-J. and D.-B. Ge, "Study on conformal FDTD for electromagnetic scattering by targets with thin coating," Progress In Electromagnetics Research, Vol. 79, 305-319, 2008.
11. Riley, D. J. and C. D. Turner, "Hybrid thin-slot algorithm for the analysis of narrow apertures in finite difference time-domain calculations," IEEE Trans. Antennas Propagat., Vol. 38, No. 12, 1943-1950, Dec. 1990.
12. Liu, Q. F., W. Y. Yin, M. F. Xue, J. F. Mao, and Q. H. Liu, "Shielding characterization of metallic enclosures with multiple slots and a thin-wire antenna loaded: Multiple oblique EMP incidences with arbitrary polarizations," IEEE Trans. Electromagn. Compat., Vol. 51, No. 2, 284-292, May 2009.
13. Noda, T. and S. Yokoyama, "Thin wire representation in finite difference time domain surge simulation," IEEE Trans. Power Del., Vol. 17, No. 3, 840-847, Jul. 2002.
14. Vance, E. F., "Shielding effectiveness of braided wire shields," IEEE Trans. Electromagn. Compat., Vol. EMC-17, No. 2, 71-77, May 1975.
15. Tyni, M., "The transfer impedance of coaxial cables with braided conductors," Proc. IEEE Electromagn. Compat. Symp., 410-418, Wroclaw, Poland, Sep. 1976.
16. Helmers, S. and K. H. Gonschorek, "On the contribution of transfer admittance to external field coupling into shielded cables," IEEE International Symposium on EMC, Vol. 1, 2-6, Aug. 1999.
17. Cheldavi, A., D. Ansari, and M. Khalaj-Amirhosseini, "Electromagnetic coupling to circulant symmetric multi-conductor microstrip line," Progress In Electromagnetics Research, Vol. 49, 189-201, 2004.
18. Liu, Q. F., W. Y. Yin, M. Tang, P. G. Liu, J. F. Mao, and Q. H. Liu, "Time-domain investigation on cable-induced transient coupling into metallic enclosures," IEEE Trans. Electromagn. Compat., Vol. 51, No. 4, 953-962, Nov. 2002.
19. Sali, S., "An improved model for the transfer impedance calculations of braided coaxial cables," IEEE Trans. Electromag. Compat., Vol. 33, No. 2, 139-143, May 1991.
20. Bates, C. P. and G. T. Hawley, "A model for currents and voltages Induced within long Transmission cables by an electromagnetic wave," IEEE Trans. Electromagn. Compat., Vol. 13, No. 4, 18-31, Nov. 1971.
21. Xie, H., J. Wang, R. Fan, and Y. Liu, "Study of loss effect of transmission lines and validity of a spice model in electromagnetic topology," Progress In Electromagnetics Research, Vol. 90, 89-103, 2009.
22. Chedid, M., I. Belov, and P. Leisner, "Electromagnetic coupling to a wearable application based on coaxial cable architecture," Progress In Electromagnetics Research, Vol. 56, 109-128, 2006.