Shielding prevents coupling of undesired radiated electro-magnetic energy into equipment otherwise susceptible to it. In view of this, some studies on shielding effectiveness of different shields against angle of incidence with conductors and conductive polymers using plane-wave theory are carried out in this paper. The plane wave shield- ing effectiveness of new combination of these materials is evaluated as a function of angle of incidence for Single, Double and Laminated Shields. Conductivity of the polymers, measured in previous investigations by the cavity perturbation technique, is used to compute the overall reflection and transmission coefficients of single and multiple layers of the polymers. With recent advancements in synthesizing stable highly conductive polymers, these light-weight mechanically strong materials appear to be viable alternatives to metals for EM1 shielding. The analysis is done at a particular frequency for all three types of shields.
Pappu Vankata Yasoda Jayasree,
Viriyala Satya Surya Baba,
Bhima Prabhakar Rao,
"Analysis of Shielding Effectiveness of Single, Double and Laminated Shields for Oblique Incidence of EM Waves," Progress In Electromagnetics Research B,
Vol. 22, 187-202, 2010. doi:10.2528/PIERB10051305
1. Naarman, H., "Synthesis of new conductive electronic polymers," Proc. Int. Cong. Synthetic Metals, Kyoto, Japan, June 1986.
2. Ehinger, K., S. Summerfield, W. Bauhofer, and S. Roth, "DC and microwave conductivity of iodine-doped polyacetylene," J. Phys. C: Solid State Phys., Vol. 17, 3753-3762, 1984. doi:10.1088/0022-3719/17/21/009
3. Naishadham, K. and P. K. Kadaba, "Measurement of the microwave conductivity of a polymeric material with potential applications in absorbers and shielding ," IEEE Trans. Microwave Theory Technol., Vol. 39, 1158-1164, July 1991. doi:10.1109/22.85383
4. William, J., "Shielding tests for cables and small enclosures in the 1- to 10-GHz range," IEEE Trans. Electromagnetic Compatibility, Vol. 12, 106-112, February 1970. doi:10.1109/TEMC.1970.303078
5. Konefal, T., J. F. Dawson, and A. C. Marvin, "Improved aperture model for shielding prediction," IEEE International Symposium on Electromagnetic compatibility, 187-192, 2003.
6. Prasad Kodali, V., Engineering Electromagnetic Compatibility, Principles, Measurements and Technologies, S. Chand & Company Ltd., 2000.
7. Paul, R. C., Introduction to Electromagnetic Compatibility, John Wiley Interscience, New York, 1992.
8. Yasumitsu, M. and T. Koki, "Electromagnetic absorption and shield properties of lossy composite multilayers," IEEE Trans. Electromagnetic Compatibility, Vol. 32, 370-374, August 1990.
9. Schulz, R. B., V. C. Plantz, and D. R. Brush, "Shielding theory and practice," IEEE Trans. Electromagnetic Compatibility., Vol. 30, 187-201, August 1988. doi:10.1109/15.3297
10. Kiang, J.-F., "Shielding effectiveness of single and double plates with slits," IEEE Transactions on Electromagnetic Compatibility, Vol. 39, No. 3, 260-264, August 1997. doi:10.1109/15.618057
11. Jayasree, P. V. Y., et al. "Shielding effectiveness of laminated shields," Journal of Radio Engineering, Vol. 17, No. 4, December 2008.
12. Jayasree, P. V. Y., et al. "Shielding effectiveness of conductive polymers against EM fields --- A case study," IE(I) Journal --- ET, Vol. 90, July 2009.