Analysis of the Metallic Enclosure with Aperture Using Time Domain Finite Element Method(TDFEM)

Abstract

In this study, the time-domain vector finite element method (TDFEM) was used to calculate the electrical shielding effectiveness of electronic device boxes with aperture. The results obtained were compared with the literature and found to be compatible. With an effect of reducing the quality of the protectors, radiation fields from aperture are not desired. The change in shielding effectiveness has been investigated by inserting perfectly conductive wires and part conductors on the aperture. A boost of about 20 dB between 500-900 MHz has been achieved.

Keywords

• Electromagnetic Interference (EMI),Shielding Effectiveness(SE),Time Domain Finite Element Method(TDFEM)

AÇIKLIĞA SAHİP METALİK KUTULARIN ZAMAN DOMENİ SONLU ELEMANLAR YÖNTEMİ(TDFEM) İLE ANALİZİ

Abstract

Bu çalışmada açıklığa sahip elektronik cihaz kutularının elektriksel ekranlama etkinliğini hesaplamak için zaman domeni vektör sonlu elemanlar metodu (TDFEM) kullanılmıştır. Elde edilen sonuçlar literatür ile karşılaştırılmış ve uyumlu olduğu görülmüştür. Açıklıklardan ışıyan alanlar, koruyucunun kalitesini düşürdüğü için istenmemektedir. Açıklık üzerine mükemmel iletken teller ve parça iletkenler yerleştirilerek ekranlama etkinliğindeki değişim incelenmiştir. 500-900 MHz arasında yaklaşık 20 dB’ lik bir ekranlama artışı sağlanmıştır.

Keywords

• Elektromanyetik Girişim,Ekranlama Etkinliği,Zaman Domeni Sonlu Elemanlar Yöntemi

References

1. Başyigit, I. B., Tosun, P. D., Ozen, S. ve Helhel, S. (2011) An affect of the aperture length to aperture width ratio on broadband shielding effectiveness, URSI GASS 2011, Bursa, 1(1). doi:10.1109/URSIGASS.2011.6050756
2. Basyigit, I. B., Dogan, H. ve Helhel, S. (2017) Simulation of metallic enclosures with apertures on electrical shielding effectiveness, ELECO 2017 10th International Conference on Electrical and Electronics Engineering, Bursa, 1(1), 1082-1084.
3. Belokour, I., LoVetri, J., ve Kashyap, S. (2000) Shielding effectiveness estimation of enclosures with apertures, IEEE International Symposium, 2, 855-860. doi:10.1109/ISEMC.2000.874734
4. Carpes, W.P. ve ark.(2000) TLM and FEM Methods applied in the Analysis of electromagnetic coupling, IEEE Transactions on Magnetics, 36(4), 982-985. doi:10.1109/20.877606
5. Carpes Jr, W. P., Pichon, L. ve Razek, A. (2000) A 3D finite element method for the modelling of bounded and unbounded electromagnetic problems in the time domain, International Journal of Numerical Modelling: Electronic Networks, Devices and Fields, 13(6), 527-540. doi:10.1002/1099-1204(200011/12)13:6<527::AID-JNM391>3.0.CO;2-V
6. Carpes, W. P., Pichon, L. ve Razek, A. (2002) Analysis of the coupling of an incident wave with a wire inside a cavity using an FEM in frequency and time domains, IEEE Transactions on Electromagnetic Compatibility, 44(3), 470-475. doi:10.1109/TEMC.2002.801767
7. Cerri, G., De Leo, R. ve Primiani, V. M. (1992) Theoretical and experimental evaluation of the electromagnetic radiation from apertures in shielded enclosure, IEEE Transactions on Electromagnetic Compatibility, 34(4), 423-432. doi:10.1109/15.179275
8. De Smedt, R. ve ark.(2002) Effect of a board on the shielding effectiveness of a Box, Emc Europe 2002 International Symposium On Electromagnetic Compatibility, Sorrento, 341-345.

9. Erbaş, C. ve Kent, S. (2003) Shielding effectiveness of a rectangular cavity with aperture between 1-3 GHz, IEEE International Symposium on Electromagnetic Compatibility, 1,343-346. doi:10.1109/ICSMC2.2003.1428261
10. Feng, C. ve Shen, Z. (2005) A hybrid FD-MoM technique for predicting shielding effectiveness of metallic enclosures with apertures, IEEE Transactions on Electromagnetic Compatibility, 47(3), 456-462. doi:10.1109/TEMC.2005.851726
11. Güler, S. (2007) Elektromanyetik uyumluluk tekniklerinde elektromanyetik ışımanın modellenmesi, Uludağ üniversitesi, Fen Bilimleri Enstitüsü, Doktora Tezi.
12. Harrington, R. (1982) Resonant behavior of a small aperture backed by a conducting body, IEEE Transactions on Antennas and Propagation, 30(2), 205-212. doi:10.1109/TAP.1982.1142761
13. Hill, D.A. ve ark.(1994) Aperture excitation of electrically large, lossy cavities, IEEE Transactions on EMC, 36(3), 169-178. doi: 10.1109/15.305461
14. Jin, J.M.(1993) The Finite Element Method in Electromagnetics, Wiley.
15. Kim S. ve Lee J.(2007) Shielding effectiveness of an enclosure with a dielectric-backed aperture, Microwave Conference, Asia-Pacific,1-4. doi: 10.1109/APMC.2007.4554856
16. Kubík, Z. ve Skála, J. (2016) Shielding Effectiveness Simulation of Small Perforated Shielding Enclosures Using FEM, Energies, 9(3), 129. doi:10.3390/en9030129
17. Li, M. ve ark.(2000) EMI from cavity modes of shielding enclosures-FDTD modelling and measurements, IEEE Transactions on Electromagnetic Compatibility, 42(1), 29-38. doi:10.1109/15.831702
18. Mendez, H. A. (1978) Shielding theory of enclosures with apertures, IEEE Transactions on Electromagnetic Compatibility, 2, 296-305. doi:10.1109/TEMC.1978.303722
19. Ozyalcin, M. O., Sevgi, L. ve Topuz, E. (2003) Validation Tests for transmission Line Matrix Method in EMC Calculations, The 2003 IEEE Int. Symposium on EMC, İstanbul, 2, 1277-1280. doi:10.1109/ICSMC2.2003.1429153
20. Robinson, M.P. ve ark.(1998) Analytical formulation for the shielding effectiveness of enclosures with apertures, IEEE Transactions on EMC, 40(3), 240-247. doi:10.1109/15.709422
21. Siah, E.S. ve ark.(2003) Coupling studies and shielding techniques for electromagnetic penetration through apertures on complex cavities and vehicular platforms, IEEE Transactions on Electromagnetic Compatibility, 45(2), 245-256. doi:10.1109/TEMC.2003.810814
22. Thomas, D.W.P. ve ark.(1999) Characterisation of the shielding effectiveness of loaded equipment enclosures, IEE EMC York 99 Conference Publication, 464, 89-94. doi:10.1049/cp:19990250
23. Wang,H. ve ark.(2003) Impedance boundary conditions in a hybrid FEM/MOM formulation, IEEE Transactions on Electromagnetic Compatibility, 45(2), 198-206. doi:10.1109/TEMC.2003.810813
24. Wang, Y.J. ve ark.(2002) Electromagnetic coupling analysis of transient signal through slots or apertures perforated in a shielding metallic enclosure using FDTD Methodology, Progress in Electromagnetics Research, 36, 247-264. doi: 10.2528/PIER02021701
25. Yenikaya, S. ve Akman, A. (2009) Hybrid MoM/FEM modeling of loaded enclosure with aperture in EMC problems. International Journal of RF and Microwave Computer‐Aided Engineering, The University of Colorado, Boulder, 19 (2), 204-210. doi:10.1002/mmce.20341