洛伦兹介质电磁特性分析的通用FDTD方法

• 作 者: 张玉强
• 机 构: 延安大学信息学院,
• 出 处: 微波学报
• 发表日期: 2012年04期
• 关键词: FDTD dispersive medium Lorentz medium shift operator

针对窄带、宽带及其临界情况时洛伦兹介质对应不同时域表达式而导致的递归卷积、Z变换等常用色散介质FDTD方法的更新公式无法通用问题,提出一种改进的移位算子FDTD方法,该方法保持了原方法概念简明、推导简单的优点,减少了内存占用,提高了计算速度,对窄带、宽带及其临界情况洛伦兹介质具有完全相同的更新公式。最后,通过具体算例验证了算法的有效性。

Aiming at the problems that the update formula of FDTD method, such as recursive convolution and Z-transform caused by Lorentzian medium corresponding to different time-domain expressions when narrowband, wideband and their critical conditions are not common, can not be generalized, an improved shift operator FDTD method. This method keeps the advantages of the original method, such as conciseness of concept and simple derivation, reduced memory occupation and speed of calculation, and has the same update formula for Lorentz medium in narrow band, wide band and critical condition. Finally, the effectiveness of the algorithm is verified by a concrete example.