Research on the Variation of Shielding Effectiveness of Double-Layer Shielding Enclosure with the Position and Number of Apertures
Zhang Yan1,2, Tian Zheng1, Wang Chuanchuan3, Yang Qingxi2, Wang Sifei1
1.School of Electrical Engineering Hebei University of Science and Technology Shijiazhuang 050018 China; 2. National Key Laboratory of Strong Electromagnetic Environmental Effects Army Engineering University(Shijiazhuang Campus) Shijiazhuang 050003 China; 3. State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System Luoyang 471003 China
Abstract：The position and number of apertures affect the electromagnetic wave diffraction, and then have an important impact on the shielding effectiveness of the double-layer enclosure. Based on Robinson equivalent circuit method and electromagnetic topology theory (EMT), the modified Baum-Liu-Tesche (BLT) equation for calculating shielding effectiveness of double-layer shielding enclosure under plane wave irradiation is derived. By introducing the eccentricity coefficient Cm and the impedance of Robinson aperture array into the BLT equation, it can be used to calculate the shielding effectiveness of double-layer enclosure with arbitrary aperture position and number. Simulation results show that the shielding effectiveness of the double-layer enclosure decreases with the increase of the overlap area of the inner and outer apertures. When the area is fixed, the shielding effectiveness increases with the increase of the number of apertures, but when the aperture length is equal to the wavelength, the shielding effectiveness reaches a minimum. The calculation results of modified BLT equation are consistent with the CST simulation results, and the calculation time is greatly reduced, which validates the modified BLT equation.
张岩, 田铮, 王川川, 杨清熙, 王思飞. 双层腔体屏蔽效能随孔缝位置与数量变化规律研究[J]. 电工技术学报, 2022, 37(13): 3350-3360.
Zhang Yan, Tian Zheng, Wang Chuanchuan, Yang Qingxi, Wang Sifei. Research on the Variation of Shielding Effectiveness of Double-Layer Shielding Enclosure with the Position and Number of Apertures. Transactions of China Electrotechnical Society, 2022, 37(13): 3350-3360.
[1] 刘国军, 靳洋, 王智慧, 等. 电力通信设备电磁兼容标准体系建设[J]. 电力建设, 2014, 35(4): 76-80. Liu Guojun, Jin Yang, Wang Zhihui, et al.Electromagnetic compatibility standard system construction of power communication equipment[J]. Power Construction, 2014, 35(4): 76-80. [2] Su Donglin, Liu Hongyi, Yang Shunchuan, et al.An analytical method for calculating the shielding effectiveness of an enclosure with an oblique rectangular aperture[J]. Chinese Journal of Electronics, 2019, 28(4): 850-854. [3] 胡溥宇, 赵昱, 杨锦鹏, 等. 任意平面波辐照下开孔矩形腔体屏蔽效能快速计算方法[J]. 电工技术学报, 2018, 33(15): 3651-3660. Hu Puyu, Zhao Yu, Yang Jinpeng, et al.A fast approach for calculating the shielding effectiveness of rectangular enclosures with apertures under oblique plane wave illuminations[J]. Transactions of China Electrotechnical Society, 2018, 33(15): 3651-3660. [4] 王殿海, 石成英, 蔡星会, 等. 核电磁脉冲双层开孔矩形腔体屏蔽效能研究[J]. 核电子学与探测技术, 2019, 39(2): 159-163. Wang Dianhai, Shi Chengying, Cai Xinghui, et al.Study on the shielding effectiveness of rectangular double-deck cavity under HEMP[J]. Nuclear Electronics & Detection Technology, 2019, 39(2): 159-163. [5] 刘尚合, 刘卫东. 电磁兼容与电磁防护相关研究进展[J]. 高电压技术, 2014, 40(6): 1605-1613. Liu Shanghe, Liu Weidong.Progress of relevant research on electromagnetic compatibility and electromagnetic protection[J]. High Voltage Engineering, 2014, 40(6): 1605-1613. [6] 尤贵, 魏露露, 周思远. VPX机箱的电磁防护设计及测试整改[J]. 安全与电磁兼容, 2020(6): 55-59. You Gui, Wei Lulu, Zhou Siyuan.Electromagnetic protection design and test rectification of VPX chassis[J]. Safety and Electromagnetic Compatibility, 2020(6): 55-59. [7] 郝建红, 公延飞, 蒋璐行, 等. 开有介质封堵环状孔缝的双金属腔体屏蔽效能的解析研究[J]. 电工技术学报, 2018, 33(1): 131-139. Hao Jianhong, Gong Yanfei, Jiang Luhang, et al.Analytical formulation for the shielding effectiveness of a cascaded double metallic enclosures with an annular aperture sealed by conductive material[J]. Transactions of China Electrotechnical Society, 2018, 33(1): 131-139. [8] Robinson M P, Benton 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] Baum C E.Including apertures and cavities in the BLT formalism[J]. Electromagnetics, 2005, 25(7-8): 623-625. [10] 吴刚, 邵小亮, 孙靖虎, 等.有孔双层矩形金属机壳屏蔽效能[J]. 强激光与粒子束, 2015, 27(10): 94-99. Wu Gang, Shao Xiaoliang, Sun Jinghu, et al.Shielding effectiveness of metallic double-stage enclosures with apertures[J]. High Power Laser and Particle Beams, 2015, 27(10): 94-99. [11] 罗静雯, 杜平安, 任丹, 等. 基于BLT方程的双层腔体屏蔽效能计算方法[J]. 强激光与粒子束, 2015, 27(11): 166-171. Luo Jingwen, Du Pingan, Ren Dan, et al.BLT equation-based approach for calculating shielding effectiveness of double layer rectangular enclosures with apertures[J]. High Power Laser and Particle Beams, 2015, 27(11): 166-171. [12] Gong Yanfei, Li Yujie, Jiang Luhang.Efficient analytical method for the shielding effectiveness of an apertured enclosure based on the BLT equation[J]. IET Science, Measurement & Technology, 2020, 14(8): 897-904. [13] 张亚普, 达新宇, 谢铁城. 偏心孔缝腔体屏蔽效能电磁拓扑分析算法[J]. 电波科学学报, 2014, 29(5): 994-1002. Zhang Yapu, Da Xinyu, Xie Tiecheng.Electromagnetic topology algorithm of shielding effectiveness analysis of a metallic enclosure with off-center apertures[J]. Chinese Journal of Radio Science, 2014, 29(5): 994-1002. [14] 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. [15] Azaro R, Caorsi S, Donelli M, et al.Evaluation of the effects of an external incident electromagnetic wave on metallic enclosures with rectangular apertures[J]. Microwave and Optical Technology Letters, 2001, 28(5): 289-293. [16] 罗静雯, 杜平安, 任丹, 等. 一种基于BLT方程的孔缝腔体屏蔽效能计算方法[J]. 物理学报, 2015, 64(1): 62-69. Luo Jingwen, Du Pingan, Ren Dan, et al.A BLT equation-based approach for calculating the shielding effectiveness of enclosures with apertures[J]. Acta Physica Sinica, 2015, 64(1): 62-69. [17] 郝建红, 公延飞, 蒋璐行, 等. 内置电路板的复杂多腔体电磁串扰屏蔽效能的解析研究[J]. 电工技术学报, 2018, 33(3): 670-679. Hao Jianhong, Gong Yanfei, Jiang Luhang, et al.Analytical formulation for the shielding effectiveness of electromagnetic crosstalk from a complex multiple enclosures with inner circuit board[J]. Transactions of China Electrotechnical Society, 2018, 33(3): 670-679. [18] 郝建红, 蒋璐行, 钱思羊. 基于BLT方程的内置介质板异型腔屏蔽效能[J]. 电工技术学报, 2020, 35(18): 3791-3801. Hao Jianhong, Jiang Luhang, Qian Siyang.The shielding effectiveness of heterotypic enclosures embedded dielectric layers based on the BLT equation[J]. Transactions of China Electrotechnical Society, 2020, 35(18): 3791-3801. [19] Gong Yanfei, Hao Jianhong, Jiang Luhang.Efficient analytical method for the coupling to penetrated transmission line in multiple enclosures based on electromagnetic topology[J]. IET Science, Measurement & Technology, 2018, 12(3): 335-342. [20] 公延飞, 陈星彤, 高超飞, 等. 一种快速预测有损腔体屏蔽效能和谐振模式的解析模型[J]. 电工技术学报, 2021, 36(8): 1569-1578. Gong Yanfei, Chen Xingtong, Gao Chaofei, et al.An analytical model for the fast prediction of the shielding effectiveness and resonances of a lossy enclosure[J]. Transactions of China Electrotechnical Society, 2021, 36(8): 1569-1578. [21] Yin Mingchu, Du Pingan.An improved circuit model for the prediction of the shielding effectiveness and resonances of an enclosure with apertures[J]. IEEE Transactions on Electromagnetic Compatibility, 2016, 58(2): 448-456.
2022, Vol. 37 
