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本文基于等效电路法, 提出一种通过BLT方程计算带孔缝箱体屏蔽效能的方法, 可以快速准确计算任意入射、极化平面波照射箱体以及任意位置开孔和双面开孔箱体的屏蔽效能. 根据等效电路法求解出孔缝散射矩阵, 依据信号流图建立传播关系和散射关系方程, 并推导出包含孔缝耦合效应的广义BLT方程. 将BLT方程计算结果与等效电路法计算结果以及CST仿真做对比, 验证了方法的正确性. 与等效电路法相比, 在同一孔阻抗下, 孔缝散射矩阵包含箱体内外能量之间的相互耦合作用, 本方法计算结果精度更高, 能预测更多箱体谐振模式; 与CST仿真相比, 本方法占用时间和资源少, 可以对箱体参数进行规律性研究.A calculation method based on BLT equation is proposed for analyzing the shielding effectiveness of enclosures containing apertures. This method can accurately and quickly obtain the shielding effectiveness of oblique incidence and polarization, off-centered apertures, and multi-apertures in two walls of enclosures. Aperture scattering matrix can be obtained according to equivalent circuit theory. Then, propagation relationships and reflection relationships are established, and finally the general BLT equation is derived, including the coupling to apertures. In order to verify the validity, the results are compared with these from equivalent circuit theory and CST. With the same aperture impedance, the aperture scattering matrix contains the interaction of the electromagnetic field so that the method proposed in this paper owns higher precision and can predict more resonant modes compared with the equivalent circuit theory. This method takes less time and computer resource compared with CST which cannot easily get the influence of enclosure parameters.
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Keywords:
- BLT equation /
- aperture scattering matrix /
- equivalent circuit theory /
- shielding effectiveness
[1] Yenikaya S 2011 Iranian Journal of Electrical and Computer Engineering. 10 70
[2] Chen J, Wang J G 2007 IEEE Transactions on Electromagnetic Compatibility 49 354
[3] Zhou G Q 2011 Chin. Phys. B 20 074203
[4] Martin T, Backstrom M, Loren J 2003 IEEE Transactions on Electromagnetic Compatibility 45 229
[5] Niu S, Jiao C Q, Li L 2013 Acta Phys. Sin. 62 214102 (in Chinese) [牛帅, 焦重庆, 李琳 2013 62 214102]
[6] Shim J, Kam D G, Kwon J H, Kim J 2010 IEEE Transactions on Electromagnetic Compatibility 52 566
[7] Jiao C Q, Qi L 2012 Acta Phys. Sin. 61 114102 (in Chinese) [焦重庆, 齐磊 2012 61 114102]
[8] Bethe H A 1944 Phys. Rev. 66 163
[9] Jiao C Q, Niu S 2013 Acta Phys. Sin 62 134104 (in Chinese) [焦重庆, 牛帅 2013 62 134104]
[10] Robinson M P, Benson T M, Christopoulos C 1998 IEEE Trans on Electromagne Compat. 40 240
[11] Wang J G, Liu G Z, Zhou J S 2003 High Power Laser and Particle Beams 15 1093 [王建国, 刘国治, 周金山. 2003 强激光与粒子束 15 1093]
[12] Kang W J, Lee V O, Mun S K, Chung Y S, Cheon C Y 2010 IEEE Antennas and Propagation Society International Symposium. July 11-17 2010 p1-4
[13] Tesche F M 2007 IEEE Trans on Electromagn Compat. 49 427
[14] Baum C E 2005 Electromagnetics 25 623
[15] Xie H Y, Wang J G, Fan R Y, Liu Y N 2011 IEEE Trans on Electromagnetic Compatibility 53 185
[16] Zhang Y P, Da X Y, Xie T C 2014 High Power Laser and Particle Beams 02 234 [张亚普, 达新宇, 谢铁城 2014 强激光与粒子束 02 234]
[17] Tesche F M, Butler C M 2003 Interaction Notes 588
[18] Azaro R, Caorsi S, Donelli, M, Gragnani, G L 2002 Microwave Theory and Techniques, IEEE Transactions 50 2259
[19] Shi D, Shen Y M, Ruan F M, Wei Z G, Gao Y G 2008 IEEE International Symposium on. Aug. 18-22 2008 p1-5
[20] Mao X Y, Du P A 2010 Science China Technological Sciences 07 1993
[21] Dehkhoda P, Tavakoli A, Moini R 2008 IEEE Transactions 50 208
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[1] Yenikaya S 2011 Iranian Journal of Electrical and Computer Engineering. 10 70
[2] Chen J, Wang J G 2007 IEEE Transactions on Electromagnetic Compatibility 49 354
[3] Zhou G Q 2011 Chin. Phys. B 20 074203
[4] Martin T, Backstrom M, Loren J 2003 IEEE Transactions on Electromagnetic Compatibility 45 229
[5] Niu S, Jiao C Q, Li L 2013 Acta Phys. Sin. 62 214102 (in Chinese) [牛帅, 焦重庆, 李琳 2013 62 214102]
[6] Shim J, Kam D G, Kwon J H, Kim J 2010 IEEE Transactions on Electromagnetic Compatibility 52 566
[7] Jiao C Q, Qi L 2012 Acta Phys. Sin. 61 114102 (in Chinese) [焦重庆, 齐磊 2012 61 114102]
[8] Bethe H A 1944 Phys. Rev. 66 163
[9] Jiao C Q, Niu S 2013 Acta Phys. Sin 62 134104 (in Chinese) [焦重庆, 牛帅 2013 62 134104]
[10] Robinson M P, Benson T M, Christopoulos C 1998 IEEE Trans on Electromagne Compat. 40 240
[11] Wang J G, Liu G Z, Zhou J S 2003 High Power Laser and Particle Beams 15 1093 [王建国, 刘国治, 周金山. 2003 强激光与粒子束 15 1093]
[12] Kang W J, Lee V O, Mun S K, Chung Y S, Cheon C Y 2010 IEEE Antennas and Propagation Society International Symposium. July 11-17 2010 p1-4
[13] Tesche F M 2007 IEEE Trans on Electromagn Compat. 49 427
[14] Baum C E 2005 Electromagnetics 25 623
[15] Xie H Y, Wang J G, Fan R Y, Liu Y N 2011 IEEE Trans on Electromagnetic Compatibility 53 185
[16] Zhang Y P, Da X Y, Xie T C 2014 High Power Laser and Particle Beams 02 234 [张亚普, 达新宇, 谢铁城 2014 强激光与粒子束 02 234]
[17] Tesche F M, Butler C M 2003 Interaction Notes 588
[18] Azaro R, Caorsi S, Donelli, M, Gragnani, G L 2002 Microwave Theory and Techniques, IEEE Transactions 50 2259
[19] Shi D, Shen Y M, Ruan F M, Wei Z G, Gao Y G 2008 IEEE International Symposium on. Aug. 18-22 2008 p1-5
[20] Mao X Y, Du P A 2010 Science China Technological Sciences 07 1993
[21] Dehkhoda P, Tavakoli A, Moini R 2008 IEEE Transactions 50 208
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