Thin absorbing layers containing magnetic alloy or ferrite inclusions can be effectively used for attenuating common-mode currents on extended structures, such as power cords, cables, or edge-coupled microstrip lines. An analytical model to evaluate attenuation on the coaxial line with the central conductor coated with a magneto-dielectric layer is proposed and validated by the experiments and numerical modeling. The analytical model is validated using available magneto-dielectric samples of different thicknesses. This model can serve for comparing and predicting the absorptive properties of different samples of magneto-dielectric materials, whose compositions may be unknown, but dielectric and magnetic properties can be determined by independent measurements over the specified frequency ranges. From modeling the absorption in a coaxial line with a wrapped central conductor, it could be concluded whether it is reasonable to use this particular material in such applications as a shield on an Ethernet or other cable, for reducing potential common-mode currents and unwanted radiation in the frequency range of interest.
1. Celozzi, S., R. Araneo, and G. Lovat, Electromagnetic Shielding, Wiley, New York, 2008.
2. Neelakanta, P. S., Handbook of Electromagnetic Material: Monolithic and Composite Versions and Their Applications, CRC Press, Boca Raton, FL, 1995.
3. Koledintseva, M. Y., J. Xu, S. De, J. L. Drewniak, Y. He, and R. Johnson, "Systematic analysis and engineering of absorbing materials containing magnetic inclusions for EMC applications," IEEE Trans. Magn., Vol. 47, No. 2, 317-323, Feb. 2011. doi:10.1109/TMAG.2010.2084991
4. Koledintseva, M., K. N. Rozanov, and J. L. Drewniak, "Engineering, modeling and testing of composite absorbing materials for EMC applications ," Advances in Composite Material --- Ecodesign and Analysis, B. Attaf (ed.), Chapter 13, 291-316, InTech, Mar. 2011.
5. Naito, Y. and K. Suetake, "Application of ferrite to electromagnetic wave absorber and its characterization," IEEE Trans. Microw. Theory Techn., Vol. 19, 65-72, Jan. 1971. doi:10.1109/TMTT.1971.1127446
6. Shin, J. Y. and J. H. Oh, "The microwave absorbing phenomena of ferrite microwave absorbers," IEEE Trans. Magn., Vol. 29, No. 6, 3437-3439, Nov. 1993. doi:10.1109/20.281188
7. Anantharaman, M., K. Malini, S. Sindhu, E. M. Mohammed, S. K. Date, S. D. Kulkarni, P. A. Joy, and P. Kurian, "Tailoring magnetic and dielectric properties of rubber ferrite composites containing mixed ferrites," Bulletin of Materials Science, Vol. 24, No. 6, 623-631, Dec. 2001. doi:10.1007/BF02704011
8. Chung, Y.-C., D.-Y. Kim, and D.-C. Park, "Design of broadband electromagnetic absorber using NiZn/MnZn hybrid structure," Proc. IEEE Symp. Electromag. Compat., 409-412, Austin, TX, Aug. 1997.
9. Kazantseva, N. E., J. Vilcakova, V. Kresalek, P. Saha, I. Sapurina, and J. Stejskal, "Magnetic behavior of composites containing polyaniline-coated manganese-zinc ferrite," Journal of Magnetism and Magnetic Materials (JMMM), Vol. 269, No. 1, 30-37, Feb. 2004. doi:10.1016/S0304-8853(03)00557-2
10. Bregar, V., "Potential application of composite with ferromagnetic nanoparticles in microwave absorber," IEEE Trans. Magn., Vol. 40, 1679-1684, 2004. doi:10.1109/TMAG.2004.826622
11. Musal, H. and H. Hahn, "Thin-layer electromagnetic absorber design," IEEE Trans. Magn., Vol. 25, No. 5, 3851-3853, May 1989. doi:10.1109/20.42454
12. Maslovski, S. I., P. M. T. Ikonen, I. Kolmakov, S. A. Tretyakov, and M. Kaunisto, "Artificial magnetic materials based on the new magnetic particle: Metasolenoid," Progress In Electromagnetics Research, Vol. 54, 61-81, 2005. doi:10.2528/PIER04101101
13. Ott, H., Noise Reduction Techniques in Electronic Systems, Wiley, New York, 1988.
15. Vinoy, K. J. and R. M. Jha, Radar Absorbing Materials --- From Theory to Design and Characterization, Kluwer Academic Publishers, Boston, MA, 1996.
16. Koledintseva, M. Y., V. V. Bodrov, I. V. Sourkova, M. M. Sabirov, and V. I. Sourkov, "Unified spectral technique application for study of radiator behavior near planar layered composites," Progress In Electromagnetic Research, Vol. 66, 317-357, 2006. doi:10.2528/PIER06111701
17. Nicolson, A. M. and G. Ross, "Measurement of the intrinsic properties of materials by time domain techniques," IEEE Trans. Instrum. Meas., Vol. 19, 377-382, Nov. 1970.
18. Weir, W. B., "Automatic measurement of complex dielectric constant and permeability at microwave frequencies ," Proc. IEEE, Vol. 62, 33-36, Jan. 1974. doi:10.1109/PROC.1974.9382
19. Baker-Jarvis, J., "Transmission/reflection and short-circuit line permittivity measurements," Technical Note 1341, Department of Commerce, NIST, US, Jul. 1990.
21. Tosaka, T., I. Nagano, S. Yagitani, and Y. Yoshimura, "Determining the relative permeability and conductivity of thin materials ," IEEE Trans. Electromag. Compat., Vol. 47, No. 2, 352-360, May 2005. doi:10.1109/TEMC.2005.847397
22. Chen, L. F., C. K. Ong, C. P. Neo, V. V. Varadan, and V. K. Varadan, Microwave Electronics: Measurement and Materials Characterisation, Wiley, England, 2004.
23. Sanderson, A. E., "Effect of surface roughness on propagation of the TEM mode," Advances in Microwaves, Vol. 7, 2-57, Academic Press, 1971.
24. Holloway, C. L. and E. F. Kuester, "Power loss associated with conducting and superconducting rough surfaces," IEEE Trans. Microw. Theory Tech., Vol. 48, No. 10, 1601-1610, Oct. 2000. doi:10.1109/22.873886
25. Matsushima, A. and K. Nakata, "Power loss and local surface impedance associated with conducting rough interfaces," Electronics and Communications in Japan, Part 2, Vol. 89, No. 1, 2006, translated from Denshi Joho Gakkai Ronbunshi, Vol. J88-C, No. 7, 502-511, Jul. 2005.
26. Koledintseva, M., A. Koul, F. Zhou, J. Drewniak, and S. Hinaga, "Surface impedance approach to calculate loss in rough conductor coated with dielectric layer," IEEE Symp. Electromag. Compat., 790-795, Fort Lauderdale, FL, Jul. 2010.
27. Markov, G. T., B. M. Petrov, and G. P. Grudinskaya, Electrodynamics and Radio Wave Propagation, Chapter 6.3, ovetskoye Radio, Moscow, 1979 (in Russian).
28. Collin, R. E., Field Theory of Guided Waves, 2nd Ed., Chapter 11, IEEE, Wiley, 1991.
29. Goubau, G., "Surface waves and their application to transmission lines," J. Appl. Phys., Vol. 21, 119-1128, 1950.
30. Baskakov, S. I., Radio Engineering Circuits with Distributed Parameters, Vysschaya Shkola, Moscow, 1980 (in Russian).
31. Pozar, D. M., Microwave Engineering, 2nv Ed., Chapter 3, Wiley, 1998.
32. Koledintseva, M. Y., J. L. Drewniak, T. P. van Doren, D. J. Pommerenke, M. Cocchini, and D. M. Hockanson, "Method of edge currents for calculating mutual external inductance in a microstrip structure ," Progress In Electromagnetic Research, Vol. 80, 197-224, 2008. doi:10.2528/PIER07101504