Shielding effectiveness

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K., M. J., K. D. B. O., and O. H. A., "A Hybrid MOM/FDTD Formulation for EMC/EMI Problems Of Metallic Enclosures with Apertures", KSEEE-JSAEM 2010 International Conference, MMUCK, Nairobi, International Journal of Technical and Physical Problems of Engineering (IJTPE), 4 Aug, 2010. Abstract


Josiah K. Makiche1 Dominic B. O. Konditi2, Heywood A. Ouma3

1Department of Telecommunication and Information Engineering, Jomo Kenyatta University of Agriculture and Technology. 2Faculty of Engineering, Multimedia University College of Kenya. 3Department of Electrical and Information Engineering, University of Nairobi

Abstract—In this work a hybrid Method-of-Moments/Finite-Difference-Time-Domain (MoM/FDTD) formulation for the analysis of a metallic enclosure with an aperture is developed. The equivalence principle is used to divide the problem into two regions, region 1 and region 2, each of which is treated separately. The induced aperture magnetic currents are obtained via a moments method solution of the mixed potential integral equation using the generalized network formulation and triangular patch modeling. The computed magnetic current is directly incorporated into FDTD formulations as a source to determine the fields in the interior of the enclosure (region 2). The formulations are implemented in a computer code and used to analyze a typical problem of a rectangular enclosure with an aperture. The results are validated using data available in literature.
Keywords: Shielding effectiveness, metallic enclosures, method of moments, finite difference time domain, EMI/EMC.

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