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| FDTD中色散介电常数的时域离散表达方法 | |
| 引用本文： | 张晓光,苏治国,王忠青,阮殿旭.FDTD中色散介电常数的时域离散表达方法[J].中国矿业大学学报,2010,39(3). |
| 作者姓名： | 张晓光 苏治国 王忠青 阮殿旭 |
| 作者单位： | 1. 中国矿业大学,机电工程学院,江苏,徐州,221116;西安电子科技大学,综合业务网理论及关键技术国家重点实验室,陕西,西安,710071 2. 爱尔兰国立都柏林大学 电气,电子及机械工程学院,都柏林 3. 中国矿业大学,机电工程学院,江苏,徐州,221116 |
| 基金项目： | 中国博士后科学基金，江苏省高技术研究项目，综合业务网理论及关键技术国家重点实验室开放课题 |
| 摘 要： | 针对递归卷积方法只适合于随频率变化比较平滑的色散介电常数情况,提出一种可以把色散(频变)介电常数直接嵌入时域有限差分的算法(FDTD).将随频率变化的色散介电常数用Debye有理函数近似,修正后的离散冲激响应用非等步长的离散时域表达直接和FDTD算法进行卷积.结果表明:用此方法的仿真结果和用递归卷积方法仿真的结果进行比较后发现2种仿真结果吻合很好.表明该方法准确、稳定,适用于色散介电常数随着频率变化非常复杂的情况. |
| 关 键 词： | 时域有限差分算法(FDTD) 非等步长 介电常数 卷积 |
Discrete-Time Representation of Generalized Frequency-Dependent Permittivity within FDTD |
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| ZHANG Xiao-guang,SU Zhi-guo,WANG Zhong-qing,RUAN Dian-xu.Discrete-Time Representation of Generalized Frequency-Dependent Permittivity within FDTD[J].Journal of China University of Mining & Technology,2010,39(3). | |
| Authors: | ZHANG Xiao-guang SU Zhi-guo WANG Zhong-qing RUAN Dian-xu |
| Abstract: | Based on the recursive convolution method, which is only suitable for the dispersive media whose permittivity changes smoothly with the frequency, a direct algorithm incorporating frequency-dependent permittivity into a finite difference time domain (FDTD) was presented. The frequency-dependent permittivity was approximated by a rational function Debye to obtain the simulation result. The same permittivity was represented as a non-uniform discrete- time modified impulse response directly implementing a convolution in FDTD algorithm to obtain the simulation result. These two simulation results were compared and showed very good agreement. The proposed method is accurate and stable, and suitable for the case that the permittivity changing complex with frequency. |
| Keywords: | finite difference time domain (FDTD) non-uniform permittivity convolution |
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