NUMERICAL CALCULATION OF SHIELDING EFFECTIVENESS OF ENCLOSURE WITH APERTURES BASED ON EM FIELD COUPLING WITH WIRE STRUCTURES

Tatjana Cvetkovic, Vesna Milutinović, Nebojša Dončov, Bratislav Milovanović

DOI Number
-
First page
585
Last page
596

Abstract


In this paper a shielding effectiveness of protective metal enclosure with apertures and receiving antenna placed inside is numerically considered. The purpose of antenna, here considered as a dipole, is to detect the electromagnetic (EM) field level within the enclosure and to transfer this information via a coaxial cable to network analyzer. This follows the experimental procedure used to measure the shielding effectiveness of enclosure. Numerical model, based on the Transmission-Line Matrix (TLM) method and enhanced with so-called wire node, is used to simulate this experimental setup in order to investigate how much the antenna/cable presence underestimates the level of shielding effectiveness due to their two-way coupling with EM field inside enclosure. The numerical model is first verified with experimental results available in literature and then used to estimate the influence of radius and length of dipole-receiving antenna and the impact of cable presence on the distribution of EM field inside the enclosure and resonant frequencies shift.


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References


C. Christopoulos, Principles and Techniques of Electromagnetic Compatibility, CRC Press, 2007.

H. A. Mendez, “Shielding Theory of Enclosures with Apertures”, IEEE Trans. Electromagn. Compat., vol. 20, no. 2, pp. 296–305, 1978.

M.P. Robinson, T. M. Benson, C. Christopoulos, J.F. Dawson, M.D. Ganley, A.C. Marvin, S.J. Porter, D.W.P. Thomas, “Analytical Formulation for the Shielding Effectiveness of Enclosures with Apertures”, IEEE Trans. Electromagn. Compat., vol. 40, no. 3, pp. 240–248, 1998.

J. Shim, D.G. Kam, J.H. Kwon, J. Kim, “Circuital Modeling and Measurement of Shielding Effectiveness against Oblique Incident Plane Wave on Apertures in Multiple Sides of Rectangular Enclosure”, IEEE Trans. Electromagn. Compat., vol. 52, no. 3, pp. 566–577, 2010.

L.J. Nuebel, J. L. Drewniak, R. E. DuBroff, T.H. Hubing, T. P. Van Doren, “EMI from Cavity Modes of Shielding Enclosures – FDTD Modeling and Measurements”, IEEE Trans. Electromagn. Compat., vol. 42, no. 1, pp. 29–38, 2000.

S. Ali, D.S. Weile, T. Clupper, “Effect of Near Field Radiators on the Radiation Leakage through Perforated Shields”, IEEE Trans. Electromagn. Compat., vol. 47, no. 2, pp. 367–373, 2005.

B.L. Nie, P.A. Du, Y.T. Yu, Z. Shi, “Study of the Shielding Properties of Enclosures With Apertures at Higher Frequencies Using the Transmission-Line Modeling Method”, IEEE Trans. Electromagn. Compat., vol. 53, no. 1, pp. 73–81, 2011.

N. Doncov, B. Milovanović, Z. Stankovic, “Extension of Compact TLM Air-Vent Model on Rectangular and Hexagonal Apertures”, Applied Computational Electromagnetic Society (ACES) Journal, vol. 26, no. 1, pp. 64-72, 2011.

A. Mallic, D. P. Johns, A. J. Wlodarczyk, “TLM Modelling of Wires and Slots", in Proceedings of International Zurich Symposium on Electromagnetic Compatibility, Zurich, Switzerland, pp. 515-520, 1993.

V. Milutinovic, T. Cvetkovic, N. Doncov, B. Milovanovic, “Analysis of Enclosure Shielding Properties Dependence on Aperture Spacing and Excitation Parameters”, in Proceedings of the IEEE TELSIKS Conference, Niš, Serbia, vol. 2, pp. 521-524, 2011.

J. Jokovic, B. Milovanovic, N. Doncov, “Numerical Model of Transmission Procedure in a Cylindrical Metallic Cavity Compared with Measured Results”, Int. Journal of RF and Microwave Computer-Aided Engineering, vol. 18, no. 4, pp. 295-302, 2008.

Tatjana Cvetković, Vesna Milutinović, Nebojša Dončov, Bratislav Milovanović, “TLM modelling of receiving dipole antenna impact on shielding effectiveness of enclosure“, Int. J. Reasoning-based Intelligent Systems, Vol. 5, No. 3,2013.

Vesna Milutinović, Tatjana Cvetković, Nebojša Dončov, Bratislav Milovanović, “Circuital and Numerical Models for Calculation of Shielding Effectiveness of Enclosure with Apertures and Monitoring Dipole Antenna Inside”, Radioengineering journal, Brno University of Technology - Faculty of Electrical Engineering and Communication, Vol.22, No. 4, pp 1249-1257, 2013.

A.J. Wlodarczyk, V. Trenkic, R. Scaramuzza, C. Christopoulos, “A Fully Integrated Multiconductor Model for TLM”, IEEE Trans. Microwave Theory Tech., vol. 46, no. 12, pp. 2431-2437, 1998.

T. Dimitrijevic, J. Jokovic, B. Milovanovic, N. Doncov, “TLM Modeling of a Probe-Coupled Cylindrical Cavity Based on Compact Wire Model in the Cylindrical Mesh”, Int. Journal of RF and Microwave Computer-Aided Engineering, vol. 22, no. 2, pp. 184-192, 2012.

C. Christopoulos, The Transmission-Line Modelling (TLM) Method, IEEE/OUP Series, Piscataway, NJ, 1995.


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