Maxim E. KOMNATNOV, Talgat R. GAZIZOV, Anton A. IVANOV, Alexander V. DEMAKOV

Semi-analytical Approach for Calculating Shielding Effectiveness of an Enclosure with a Filled Aperture

The paper proposes a semi-analytical approach to improve the analytical method of an enclosure equivalent circuit. This approach is based on the application of a quasi-static analysis of coplanar striplines in the calculation of the Zap impedance for an enclosure wall with an aperture. Using this approach in conjunction with existing analytical models, the shielding effectiveness can be calculated for an enclosure with an aperture filled with an arbitrary dielectric or magnetic content. The study also presents the results of extensive validation of the proposed approach in the frequency range up to 3 GHz.

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1. A. Rusiecki, K. Aniserowicz, A. P. Duffy, and A. Orlandi, “Internal stirring: An approach to approximate evaluation of shielding effectiveness of small slotted enclosures,” IET Sci. Meas. Technol., vol. 10, no. 6, pp. 659–664, Sept. 2016. [CrossRef]
2. F. Li, J. Han, and C. Zhang, “Study of the influence of PCB parameters on the shielding effectiveness of metal cavity with holes,” Proc. IEEE 3rd Int. Tech., Netw., Electron, Autom. Control, Chengdu, China, pp. 383–387, 2019. [CrossRef]
3. D. W. P. Thomas et al., “Model of the electromagnetic field inside a cuboidal enclosure populated with conducting planes or printed circuit boards,” IEEE Trans. Electromagn. Compat., vol. 43, no. 2, pp. 161–169, May 2001. [CrossRef]
4. A. A. Ivanov, M. E. Komnatnov, and T. R. Gazizov, “Analytical model for evaluating shielding effectiveness of an enclosure populated with conducting plates,” IEEE Trans. Electromagn. Compat., vol. 62, no. 5, pp. 2307–2310, Oct. 2020. [CrossRef]
5. T. Konefal, J. F. Dawson, A. C. Marvin, M. P. Robinson, and S. J. Porter, “A fast circuit model description of the shielding effectiveness of a box with imperfect gaskets or apertures covered by thin resistive sheet coatings,” IEEE Trans. Electromagn. Compat., vol. 48, no. 1, pp. 134–144, Feb. 2006. [CrossRef]
6. J. R. Solin, “Formula for the field excited in a cavity sealed by a plate backed with a conductive elastomer,” IEEE Trans. Electromagn. Compat., vol. 58, no. 1, pp. 111–116, Feb. 2006. [CrossRef]
7. R. Araneo, and G. Lovat, “Fast MoM analysis of the shielding effectiveness of rectangular enclosures with apertures, metal plates, and conducting objects,” IEEE Trans. Electromagn. Compat., vol. 51, no. 2, pp. 274–283, May 2009. [CrossRef]
8. B. L. Nie, P. A. Du, Y. T. Yu, and 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, Feb. 2010. [CrossRef]
9. M. Li, J. Nuebel, J. L. Drewniak, R. E. Dubroff, T. H. Hubing, and 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, Feb. 2000. [CrossRef]
10. S. Celozzi, R. Araneo, and G. Lovat, “Numerical methods for shielding analyses,” in Electromagnetic Shielding. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008, pp. 87–143.
11. M. P. Robinson et al., “Analytical formulation for the shielding effectiveness of enclosures with apertures,” IEEE Trans. Electromagn. Compat., vol. 40, no. 3, pp. 240–248, Aug. 1998. [CrossRef]
12. H. Karcoon, S. Parr, S. Dickmann, and R. Rambousky, “Shielding effectiveness of screened rooms with line feed-throughs – A semi-analytical approach,” in Proc. IEEE Int. Symp. on Electromang. Dresden, Germany: Compat, 2015, pp. 312–316.
13. P. Y. Hu, X. Y. Sun, and J. Chen, “Hybrid model for estimating the shielding effectiveness of metallic enclosures with arbitrary apertures,” IET Sci. Meas. Technol., vol. 14, no. 4, pp. 462–470, June 2020. [CrossRef]
14. J. Shim, D. G. Kam, J. H. Kwon, and J. Kim, “Circuital modeling and meashurement 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, Aug. 2010. [CrossRef]
15. J. R. Mautz, R. F. Harrington, and G. G. Hsu, “The inductance matrix of multiconductor transmission line in multiple magnetic media,” IEEE Trans. Microw. Theor. Tech., vol. 36, no. 8, pp. 1293–1295, Aug. 1988.
16. D. Shi, Y. Shen, and Y. Gao, “3 High-order mode transmission line model of enclosure with off-center aperture,” in Proc. IEEE Int. Symp. Electromagn. Compat., Qingdao, China, 2007, pp. 361–364.
17. M. C. Yin, and P. A. Du, “An improved circuit model for the prediction of the shielding effectiveness and resonances of an enclosure with apertures,” IEEE Trans. Electromagn. Compat., vol. 58, no. 2, pp. 448–456, Apr. 2016. [CrossRef]
18. Microwave Ferrite. Irvine, CA, USA: Skyworks Solutions Inc., 2017, pp. 1–3.
19. V. I. Suslyaev, E. Y. Korovin, and V. A. Zhuravlev, “Effective magnetic permeability of a composite material based on nanoscale haxaferrite particles,” Int. J. Nanotechnol., vol. 12, no. 3/4, pp. 192–199, Jan. 2015. [CrossRef]
20. T. R. Gazizov, “Analytic expressions for MOM calculation of capacitance matrix of two dimensional system of conductors and dielectrics having arbitrarily oriented boundaries,” in Proc. IEEE Int. Symp. on Electromagn. Monreal, Canada: Compat, 2001, pp. 151–155.