Abstract
In this paper, a numerical analysis of shielding properties of a protective metal enclosure has been performed by simulating a receiving antenna placed inside. Here, the main focus is put on the monopole antenna type. This antenna type is used in an experimental set-up to measure the shielding effectiveness (SE) of the enclosure as often as some other antennas such as dipole. Numerical model, based on the Transmission-Line Matrix (TLM) method, is applied to numerically investigate an impact this antenna might have on a detected level of electromagnetic (EM) field when it is used in the SE measurements. As in experiments, the estimation of SE of an enclosure in the numerical model is performed based on the current induced on the antenna, directly provided by a compact TLM wire model. The model accuracy is verified through a comparison with the experimental results from the literature. The analysis includes the monopole antenna with different radii and lengths, in order to consider changes in the resonant frequencies and the SE level of enclosure. Finally, the enclosure with either the monopole or the dipole is simulated in order to compare their influence on EM field distribution inside the enclosure.
Award Identifier / Grant number: TR32052
Funding statement: This work has been partially supported by the Ministry for Education, Science and Technological Development of Serbia, project number TR32052
References
[1] C. Christopoulos, Principles and Techniques of Electromagnetic Compatibility, 2nd ed. CRS Press, 2007. ISBN:-13:978–0–8493–7035–9.10.1201/9781420006339Search in Google Scholar
[2] H. Mendez, “Shielding theory of enclosures with apertures”, IEEE Trans. Electromagn. Compat., vol. 20, no. 2, pp. 296–305, 1978.10.1109/TEMC.1978.303722Search in Google Scholar
[3] P. M. Robinson, M. T. Benson, C. Christopoulos, F. J. Dawson, D. M. Ganley, C. A. Marvin, J. S. Porter and P. W. Thomas, “Analytical formulation for the shielding effectiveness of enclosures with apertures”, IEEE Trans. Electromagn. Compat., vol. 40, no. 3, pp. 240–248, 1998.10.1109/15.709422Search in Google Scholar
[4] J. Shim, D. G. Kam, J. H. Kwon and 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, 2010.10.1109/TEMC.2009.2039483Search in Google Scholar
[5] 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, 2000.10.1109/15.831702Search in Google Scholar
[6] S. Ali, D. S. Weile and 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, 2005.10.1109/TEMC.2005.847372Search in Google Scholar
[7] 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, 2011.10.1109/TEMC.2010.2047398Search in Google Scholar
[8] J. Paul, S. Greedy, H. Wakatsuchi and C. Christopoulos, “Measurements and simulations of enclosure damping using loaded antenna elements”, In Proceedings of the 10th Int. Symposium on Electromagnetic Compatibility, York, pp. 676–679, 2011.Search in Google Scholar
[9] K. L. Kaiser, Electromagnetic Compatibility Handbook, Raton, FL: CRC Press, 2005.Search in Google Scholar
[10] J. Joković, B. Milovanović and N. Dončov, “Numerical Model of Transmission Procedure in a Cylindrical Metallic Cavity Compared with Measured Results”, Int. J. RF Microw. Comput. Aided Eng., vol. 18, no. 4, pp. 295–302, 2008.10.1002/mmce.20278Search in Google Scholar
[11] V. Milutinović, T. Cvetković, N. Dončov and B. Milovanović, “Circuital and numerical models for calculation of enclosure with apertures accounting for monitoring dipole antenna inside”, Radioengineering, vol. 22, no. 4, pp. 1249–1257, 2013.Search in Google Scholar
[12] T. Cvetković, V. Milutinović, N. Dončov and B. Milovanović, “Numerical investigation of monitoring antenna influence on shielding effectiveness characterization”, Appl. Comput. Electromagn. Soc. J., vol. 29, no. 11, p. 837–845, 2014.Search in Google Scholar
[13] T. Cvetković, V. Milutinović, N. Dončov and B. Milovanović, “Numerical calculation of shielding effectiveness of enclosure with apertures based on EM field coupling with wire structures”, Facta Universit. Ser. Electron. Energ., vol. 28, no. 4, pp.585–596, 2015.10.2298/FUEE1504585CSearch in Google Scholar
[14] V. Milutinović, T. Cvetković, N. Dončov and B. Milovanović, “Analysis of monitoring dipole and monopole antennas influence on shielding effectiveness of enclosure with aperture”, Proceedings of the 4th International Conference on Information Society and Technology, Kopaonik, Serbia, pp. 399–404, 2014.Search in Google Scholar
[15] C. Christopoulos, The Transmission-Line Modelling (TLM) Method. Piscataway, NJ: IEEE Press in association with Oxford University Press, 1995.10.1109/9780470546659Search in Google Scholar
[16] J. Wlodarczyk, V. Trenkić, R. Scaramuzza and C. Chistopoulos, “A fully integrated multiconductor model for TLM”. IEEE Trans. Microwave Theory Tech., vol. 46, no. 12, pp. 2431–2437, 1998.10.1109/MWSYM.1998.700637Search in Google Scholar
[17] V. Trenkić, A. J. Wlodarczyk and R. Scaramuzza, “A modelling of coupling between transient electromagnetic field and complex wire structures,” Int. Journal of Numerical Modelling, vol. 12, no. 4, p. 257–273, 1999.10.1002/(SICI)1099-1204(199907/08)12:4<257::AID-JNM329>3.0.CO;2-LSearch in Google Scholar
[18] D. M. Pozar, Microwave Engineering, 4th ed. Wiley, 2012.Search in Google Scholar
[19] C. A. Balanis, Antenna Theory: Analysis and Design, 3th ed. Wiley, 2005. ISBN:0-471-66782–X.Search in Google Scholar
©2016 by De Gruyter
