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Abstract

The paper aims at studying the shielding effectiveness of a closed cylindrical surface simulated by N dielectric coated conducting strips. The far fields of an electric line source in the presence of the simulated surface and in the absence of the surface were calculated, and the ratio between them represents the shielding effectiveness produced around the surface. The solution of the problem was developed based on full wave analysis. In which all fields are represented in terms of infinite series of Mathieu functions. The addition theorem of Mathieu function was employed to facilitate the application of boundary condition. Computer program was developed based on the resulting formulations to produce numerical values. Numerical results are presented for circular and square cross-sectional cylindrical surfaces. Comparison with the published data for the radiation from slotted circular cylinder showed excellent agreement. Other useful results for shielding effectiveness are furnished.

1. Robinson, M. P., J. D. Turner, D. W. P. Thomas, J. F. Dawson, M. D. Ganley, A. C. Marvin, S. J. Porter, T. M. Benson, and C. Christopoulos, "Shielding effectiveness of a rectangular enclosure with a rectangular aperture," Electronics Letters, Vol. 32, No. 17, 1559-1560, Aug. 1996.
doi:10.1049/el:19961030 Google Scholar

2. Robinson, M. P., T. M. Benson, C. Christopoulos, J. F. Dawson, M. D. Ganley, A. C. Marvin, S. J. Porter, and D. W. P. Thomas, "Analytical formulation for the shielding effectiveness of enclosures with apertures," IEEE Trans. Electromagn. Compat., Vol. 40, No. 3, 240-248, Aug. 1998.
doi:10.1109/15.709422 Google Scholar

3. Dehkhoda, P., A. Tavakoli, and R.Moini, "An efficient and reliable shielding effectiveness evaluation of a rectangular enclosure with numerous apertures," IEEE Trans. Electromag. Compat., Vol. 50, No. 1, 208-212, Feb. 2008.
doi:10.1109/TEMC.2007.911922 Google Scholar

4. Park, H. H. and H. J. Eom, "Electromagnetic penetration into a rectangular cavity with multiple rectangular apertures in a conducting plane," IEEE Trans. Electromag. Compat., Vol. 42, No. 3, 303-307, Aug. 2000.
doi:10.1109/15.865338 Google Scholar

5. Bahadorzadeh Ghandehari, M., M. Naser-Moghaddasi, and A. R. Attari, "Improving of shielding effectiveness of a rectangular metallic enclosure with aperture by using extra wall," Progress In Electromagnetics Research Letters, Vol. 1, 45-50, 2008.
doi:10.2528/PIERL07110706 Google Scholar

6. Wallyn, W., D. De Zutter, and H. Rogier, "Prediction of the shielding and resonant behavior of multisection enclosures based on magnetic current modeling," IEEE Trans. Electromag. Compat., Vol. 44, No. 1, 130-138, Feb. 2002.
doi:10.1109/15.990719 Google Scholar

7. Edrisi, M. and A. Khodabakhshian, "Simple methodology for electric and magnetic shielding effectiveness computation of enclosures for electromagnetic compatibility use," Journal of Electromagnetic Waves and Applications, Vol. 20, No. 8, 1051-1060, 2006.
doi:10.1163/156939306776930312 Google Scholar

8. Jiao, C., X. Cui, L. Li, and H. Li, "Subcell FDTD analysis of shielding effectiveness of a thin-walled enclosure with an aperture," IEEE Trans. Magnetics, Vol. 42, No. 4, 1075-1078, Apr. 2006.
doi:10.1109/TMAG.2006.871638 Google Scholar

9. Li, M., K. P. Ma, D. M. Hockanso, J. L. Drewniak, T. H. Hubing, and T. P. Van Doren, "Numerical and experimental corroboration of an FDTD thin-slot model for slots near corners of shielding enclosures," IEEE Trans. Electromag. Compat., Vol. 39, No. 3, 225-232, 1997.
doi:10.1109/15.618050 Google Scholar

10. Edelvik, F. and T. Weiland, "Stable modeling of arbitrarily oriented thin slots in the FDTD method," IEEE Trans. Electromag. Compat., Vol. 47, No. 3, 440-446, Aug. 2005.
doi:10.1109/TEMC.2005.853160 Google Scholar

11. Chen, C. C., "Transmission of microwave through perforated flat plates of finite thickness," IEEE Trans. Microwave. Theory Tech., Vol. 21, No. 1, 1-6, Jan. 1973.
doi:10.1109/TMTT.1973.1127906 Google Scholar

12. Wallyn, W., D. De Zutter, and E. Laermans, "Fast effectiveness prediction for realistic rectangular enclosure," IEEE Trans. Electromag. Compat., Vol. 45, No. 4, 639-643, Nov. 2003.
doi:10.1109/TEMC.2003.819063 Google Scholar

13. Lee, W.-S., H.-L. Lee, H.-S. Jang, H.-S. Tae, and J.-W. Yu, "Analysis of scattering with multi-slotted cylinder with thickness: TM case," Progress In Electromagnetics Research, Vol. 128, 105-120, 2012.
doi:10.2528/PIER12041818 Google Scholar

14. Jang, H.-S., W.-S. Lee, H.-S. Tae, H.-L. Lee, and J.-W. Yu, "Transmission and shielding from a magnetic line current placed inside or outside of the multi-slotted circular cylinder," Journal of Electromagnetic Waves and Applications, Vol. 26, No. 11–12, 1507-1520, Aug. 2012.
doi:10.1080/09205071.2012.703570 Google Scholar

15. Holland, R. and V. Cable, "Mathieu function and their applications to scattering by a coated strip," IEEE Trans. Electromag. Compat., Vol. 34, 9-16, Feb. 1992.
doi:10.1109/15.121661 Google Scholar

16. Sebak, A., "Electromagnetic scattering by two elliptic cylinders," IEEE Antennas and Propag., Vol. 42, No. 11, 1521-1527, 1994.
doi:10.1109/8.362785 Google Scholar

17. Ragheb, H. and E. Hassan, "Plane wave scattered by N dielectric coated conducting strips," IET Microwave, Antennas and Propagation, Vol. 6, No. 8, 938-944, 2012.
doi:10.1049/iet-map.2011.0542 Google Scholar

Professor Hassan Ragheb