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提出了一种时域有限差分(FDTD)计算中色散介质薄层问题处理的新算法.对于厚度小于一个元胞尺度的电小尺寸色散介质薄层问题,采用将元胞内电位移矢量和磁感应强度加权平均的方法,求得薄层所在元胞内修正点处的等效介质参数.然后根据常见色散介质模型,包括Debye模型、Lorenz模型、Drude模型等,介电常数和磁导率可以表示为jω分式多项式的特点,结合频域到时域的转换关系(即用/t代替jω)和移位算子方法得到了修正点处的时域本构关系,进而获得时域递推计算式.数值结果表明,该方法具有通用、节省计算时间、节省内存和计算精度良好等优点.A novel technique for treating electrically thin dispersive layer with the finite difference time domain (FDTD) method is introduced. The proposed model is based on modifying the node update equations to account for the layer, where the electric and magnetic flux densities are locally averaged in the FDTD grid. Then, based on the characteristics that the complex permittivity and complex permeability of three kinds of general dispersive media model, i.e. Debye model, Lorentz model, and Drude model, may be described by rational polynomial fraction in jω, the shift operator method is then applied to obtain the recursive formulation for D and E, B and H available for FDTD computation is obtained. The model is validated with several numerical examples. The computed results illustrate the generality, memory and time step economy and the precision of presented scheme.
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Keywords:
- thin dispersive layer /
- modifying of the node /
- shift operator /
- finite difference tine domain
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[10] ]Wang M Y, Xu J, Wu J 2008 Prog. Electromag. Res.81 253
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[14] ]Mikko K K 2003 IEEE Trans. Microwave Theor. Tech. Soc. 51 1774
[15] ]Giulio A, Antonio O 2007 IEEE Microwave Wireless Compon. Lett. 17 631
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[17] ]Maloney J G, Smith G S 1992 IEEE Trans. Antenn. Propag. 40 323
[18] ]James G M, Smith G S 1993 IEEE Trans. Antenn. Propag. 41 690
[19] ]Panayiotis A T 1991 IEEE Trans. Antenn. Propag. 39 1338
[20] ]Ge D B, Yan Y B 2005 Fintie-Difference Time-Domain Method for Electromagnetic Waves(2nd Ed.) (Xi’an: Xidian University Press) (in Chinese)[葛德彪、 闫玉波 2005 电磁波时域有限差分方法 (第二版)(西安: 西安电子科技大学出版社)]
[21] ]Taflove A 2005 Advances in Computational Electromagnetics: The FDTD Method (2nd Ed.) (Norwood: Artech House)
[22] ]Wei B, Li X Y, Wang F, Ge D B 2008 Acta Phys. Sin. 58 6174(in Chinese)[魏兵、 李小勇、 王飞、 葛德彪 2009 58 6174]
[23] ]Wang F, Ge D B, Wei B 2008 Acta Phys. Sin. 58 6356(in Chinese)[王飞、 葛德彪、 魏兵 2009 58 6356]
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[1] [1]Bao J S, Liu X, Qian Z P, Xiang Y 2008 Acta Phys. Sin. 57 5537(in Chinese)[鲍峻松、 刘贤、 钱祖平、 项阳 2008 57 5537]
[2] [2]Zhang Y Q, Ge D B 2009 Acta Phys. Sin. 58 4574(in Chinese)[张玉强、 葛德彪 2009 58 4574]
[3] [3]Fu J H, Liu X L, Men F Y 2008 Acta Phys. Sin. 57 4070(in Chinese)[傅佳辉、 刘心蕾、 孟繁义 2008 57 4070]
[4] [4]Fen G Y, Yang H, Zhang D Y, Zhou S H, Zhu Q H 2008 Acta Phys. Sin. 57 5506(in Chinese)[冯国英、 杨浩、 张大勇、 周寿桓、 朱启华 2008 57 5506]
[5] [5]Ding S J, Ge D B, Shen N 2010 Acta Phys. Sin. 59 943 (in Chinese)[丁世敬、 葛德彪、 申宁 2010 59 943]
[6] [6]Liu H L, Zhang T Y, Zhu S L, Fan W H 2009 Acta Phys. Sin. 58 3658(in Chinese)[刘海亮、 张同意、 朱少岚、 范文慧 2009 58 3658]
[7] [7]Chen Z Q, Hu X W, Lan C Z, Liu M H 2009 Chin. Phys. B 18 2412
[8] [8]Liu D G, Liu S G, Zhou J 2007 Acta Phys. Sin. 56 6924(in Chinese)[刘大刚、 刘盛纲、 周俊 2007 56 6924]
[9] [9]Yang L X, Ge D B, Wei B 2007 Prog. Electromag. Res.76 275
[10] ]Wang M Y, Xu J, Wu J 2008 Prog. Electromag. Res.81 253
[11] ]Yang L X, Ge D B, Wei B 2007 Acta Phys. Sin. 56 4509(in Chinese)[杨利霞、 葛德彪、 魏兵 2007 56 4509]
[12] ]Mikko K K 2005 IEEE Trans. Antenn. Propag. 53 1174
[13] ]Mikko K K 2004 IEEE Trans. Electromag. Compat. 46 222
[14] ]Mikko K K 2003 IEEE Trans. Microwave Theor. Tech. Soc. 51 1774
[15] ]Giulio A, Antonio O 2007 IEEE Microwave Wireless Compon. Lett. 17 631
[16] ]Wei B, Ge D B, Wang F 2008 Acta Phys. Sin. 57 6290(in Chinese)[魏兵、 葛德彪、 王飞 2008 57 6290]
[17] ]Maloney J G, Smith G S 1992 IEEE Trans. Antenn. Propag. 40 323
[18] ]James G M, Smith G S 1993 IEEE Trans. Antenn. Propag. 41 690
[19] ]Panayiotis A T 1991 IEEE Trans. Antenn. Propag. 39 1338
[20] ]Ge D B, Yan Y B 2005 Fintie-Difference Time-Domain Method for Electromagnetic Waves(2nd Ed.) (Xi’an: Xidian University Press) (in Chinese)[葛德彪、 闫玉波 2005 电磁波时域有限差分方法 (第二版)(西安: 西安电子科技大学出版社)]
[21] ]Taflove A 2005 Advances in Computational Electromagnetics: The FDTD Method (2nd Ed.) (Norwood: Artech House)
[22] ]Wei B, Li X Y, Wang F, Ge D B 2008 Acta Phys. Sin. 58 6174(in Chinese)[魏兵、 李小勇、 王飞、 葛德彪 2009 58 6174]
[23] ]Wang F, Ge D B, Wei B 2008 Acta Phys. Sin. 58 6356(in Chinese)[王飞、 葛德彪、 魏兵 2009 58 6356]
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