An Efficient Method for the Shielding Effectiveness of Metallic Enclosure with Electrically Large Aperture Based on Scalar Wave Function and Cohn Model
Gong Yanfei, Hao Jianhong, Jiang Luhang
School of Electrical and Electronic Engineering North China Electric Power University Beijing 102206 China
Abstract:A complex cavity generally has an electrically large aperture based on which a fast and accurate algorithm has been developed for the shielding effectiveness from a metallic rectangular enclosure excited by plane wave out of the shielding enclosure. The electromagnetic fields from the plane wave into the enclosure through the electrically large aperture are calculated based on the Cohn model and the scalar wave function, so the shielding effectiveness of the target point is calculated. At the same time the algorithm then is employed to analyze the effect of the positions of target point on the shielding effectiveness when the position the aperture is unvaried. Comparison with the full wave simulation software CST (Computer Simulation Technology) has verified the model over a wide frequency band, which can provide the reference for the shielding effectiveness of metallic enclosure with an electrically large aperture.
公延飞, 郝建红, 蒋璐行. 基于标量波函数法和Cohn模型的电大开孔金属腔体屏蔽效能的快速算法[J]. 电工技术学报, 2018, 33(17): 3943-3950.
Gong Yanfei, Hao Jianhong, Jiang Luhang. An Efficient Method for the Shielding Effectiveness of Metallic Enclosure with Electrically Large Aperture Based on Scalar Wave Function and Cohn Model. Transactions of China Electrotechnical Society, 2018, 33(17): 3943-3950.
[1] Mohammadi E, Dehkhoda P, Tavakoli A, et al.Shielding effectiveness of a metallic perforated enclosure by mesh-free method[J]. IEEE Transactions on Electromagnetic Compatibility, 2016, 58(3): 758-765. [2] 焦重庆, 牛帅, 李琳. 复合材料工频电场和工频磁场屏蔽效能实验研究[J]. 电工技术学报, 2015, 30(10): 1-6. Jiao Chongqing, Niu Shuai, Li Lin.Experiment study of power frequency electric and magnetic shielding effectiveness for composite materials[J]. Transactions of China Electrotechnical Society, 2015, 30(10): 1-6. [3] Frikha A, Bensetti M, Duval F, et al.A new methodology to predict the magnetic shielding effectiveness of enclosures at low frequency in the near filed[J]. IEEE Transactions on Magnetics, 2015, 51(3): 8000404. [4] 郝建红, 蒋璐行, 范杰清, 等. 内置介质板的开孔箱体屏蔽效能电磁拓扑模型[J]. 电工技术学报, 2017, 32(9): 101-111. Hao Jianhong, Jiang Luhang, Fan Jieqing, et al.Electromagnetic topology model for the shielding effectiveness of an apertured enclosure with a lossy dielectric layer[J]. Transactions of China Electrotechnical Society, 2017, 32(9): 101-111. [5] Nobakhti M, Dehkhoda P, Tavakoli A.Improved modal method of moments technique to compensate the effect of wall dimension in shielding effectiveness evaluation[J]. IET Science, Measurement and Technology, 2014, 8(1): 17-22. [6] Georgakopoulos S V, Birtcher C R, Balanis C A.HIRF penetration through apertures: FDTD versus measurements[J]. IEEE Transactions on Electromagnetic Compatibility, 2006, 43(3): 282-292. [7] Nie Baolin, Du Pingan, Yu Yating, et al.Study of the shielding effectiveness properties of enclosures with apertures at high frequencies using the transmission-line modeling method[J]. IEEE Transactions on Electromagnetic Compatibility, 2011, 53(1): 73-81. [8] Robinson M P, Benson T M, Christopoulos C, et al.Analytical formulation for the shielding effectiveness of enclosures with apertures[J]. IEEE Transactions on Electromagnetic Compatibility, 1998, 40(3): 240-248. [9] Jongjoo S, Dong G K, Jong H K, et al.Circuital modeling and measurement of shielding effectiveness against oblique incidence plane wave on apertures in multiple sides of rectangular enclosure[J]. IEEE Transactions on Electromagnetic Compatibility, 2010, 52(3): 566-577. [10] 范杰清, 郝建红, 柒培华. 基于扩展传输线法的异型腔电场屏蔽效能[J]. 电工技术学报, 2014, 29(5): 228-233. Fan Jieqing, Hao Jianhong, Qi Peihua.Electric field shielding effectiveness of heterotypic enclosures based on adjusted transmission line method[J]. Transactions of China Electrotechnical Society, 2014, 29(5): 228-233. [11] Belkacem F T, Bensetti M, Boutar A G, et al.Combined model for shielding effectiveness estimation of a metallic enclosure with apertures[J]. IET Science, Measurement and Technology, 2011, 5(3): 88-95. [12] Hao Cui, Li Denghua.Simplified model of shielding effectiveness of a cavity with apertures on different sides[J]. IEEE Transactions on Electromagnetic Compatibility, 2014, 56(2): 335-342. [13] Konefal T, Dawson J F, Marvin A C, et al.A fast multiple mode intermediate kevel circuit model for the prediction of shielding effectiveness of a rectangular box containing a rectangular aperture[J]. IEEE Transactions on Electromagnetic Compatibility, 2005, 47(4): 678-691. [14] Nitsch J B, Tkachenko S V, Potthast S.Transient excitation of rectangular resonators through electrically small circular holes[J]. IEEE Transactions on Electromagnetic Compatibility, 2012, 54(6): 1252-1259. [15] Solin J R.Formula for the field excited in a rectangular cavity with a small aperture[J]. IEEE Transactions on Electromagnetic Compatibility, 2011, 53(1): 82-90. [16] Pouhe D, Monich G.Assessment of shielding effectiveness of gasket by means of the modified Bethe’s coupling theory[J]. IEEE Transactions on Electromagnetic Compatibility, 2011, 50(2): 305-315. [17] Dehkhoda P, Tavakoli A, Azadifar M.Shielding effectiveness of an enclosure with finite wall thickness and perforated opposing walls at oblique incidence and arbitrary polarization by GMMoM[J]. IEEE Transactions on Electromagnetic Compatibility, 2012, 54(4): 792-805. [18] Yang T, Volakis J L.Coupling onto wires enclosed in cavities with apertures[J]. Electromagnetics, 2005, 25(7-8): 655-678. [19] Solin J R.Formula for the field excited in a rectangular cavity with an electrically large aperture[J]. IEEE Transactions on Electromagnetic Compatibility, 2011, 54(1): 188-192. [20] Barkeshli K, Volakis J L.Electromagnetic scattering from an aperture formed by a rectangular cavity recessed in a ground plane[J]. Journal of Electromagnetic Waves and Application, 1991, 5: 714-734. [21] Cohn S B.Microwave coupling by large apertures[J]. Proceedings of the IRE, 1952, 40(6): 696-699.