The paper presents electromagnetic coupling of an electrical fast transient plane wave penetrating through slots or apertures perforated in one side of a shielding metallic enclosure. Numerous slots and apertures of different configurations and dimensions have been developed, which include a single slot of different length, a single aperture of different width, multiple-angular apertures of different geometry, multiple-cell aperture of different cell numbers, multiple thin slots, an aperture-cell array making up the whole side of the enclosure, and a miscellany case simulating a PC main frame. FDTD numerical method is applied to the EMI/EMC model, while time-domain outputs are converted to frequency-domain responses for further analyses using a FFT program. Practical conclusions and recommendations are drawn to aid shielding enclosure design and electromagnetic interference protection.
1. Gnecco, L. T., "The Design of Shielded Enclosures: Cost-Effective Methods to Prevent EMI," Butterworth-Heinemann, 2000.
2. Butler, C. M., Y. Rahmat-Samii, and R. Mittra, "Electromagnetic penetration through apertures in conducting surfaces," IEEE Trans. Antennas and Propagat., Vol. 26, 82-93, Jan. 1978. doi:10.1109/TAP.1978.1141788
3. Mittra, R., "Integral equation methods for transient scattering," Transient Electromagnetic Fields, L. B. Felson (Ed.), Vol. 10, Springer-Verlag, Berlin, Heidelburg, 1976.
4. Long, S. A., "A combination of linear and slot antennas for quasiisotropic coverage," IEEE Trans. Antennas Propagat., Vol. 23, 572-576, July 1975. doi:10.1109/TAP.1975.1141121
5. Butler, C. M., "A formulation of the finite-length narrow slot or strip equation," IEEE Trans. Antennas Propagat., Vol. 30, 1254-1257, Nov. 1982. doi:10.1109/TAP.1982.1142953
6. Butler, C. M., Y. Rahmat-Samii, and R. Mittra, "Electromagnetic penetration through apertures in conducting surfaces," IEEE Trans. Antennas and Propagat., Vol. 26, 82-93, Jan. 1978. doi:10.1109/TAP.1978.1141788
7. Archambeault, B., O. M. Ramahi, and C. Brench, EMI/EMC Computational Modelling Handbook, Kluwer Academic Publishers, 1998. doi:10.1007/978-1-4757-5124-6
8. Taflone, A. and K. R. Umashankar, "A hybrid moment method finite-difference time-domain approach to electromagnetic coupling and aperture penetration into complex geometries," IEEE Trans. Antenn. Propagat., Vol. 30, 617-627, Jul. 1982. doi:10.1109/TAP.1982.1142860
9. Cerri, G., R. D. Leo, V. M. Primiami, and M. Righetti, "Field penetration into metallic enclosures through slots excited by ESD," IEEE Trans. Electromag. Comput., Vol. 36, No. 2, 110-116, May 1994. doi:10.1109/15.293280
10. Wang, B.-Z., "Small-hole formalism for the FDTD simulation of small-hole coupling," IEEE Microwave and Guided Wave Letters, Vol. 5, No. 1, 15-17, Jan. 1995. doi:10.1109/75.382374
11. Wallyn, W., F. Olyslager, E. Laermans, and D. D. Zutter, "Fast evaluation of the shielding efficiency of rectangular shielding enclosures," Int. Symp. on EMC, Vol. 1, 311-316, 1999.
12., User’s Manual for XTDTD, version 5.1, REMCOM Inc., 2000.