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An interactive demonstration of electromagnetic wave propagation using time-domain finite differences

机译:使用时域有限差分的电磁波传播交互式演示

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摘要

The finite difference time-domain (FDTD) method is one of the most widely used computational methods in electromagnetics. Using FDTF, Maxwell's equations are solved directly in the time domain via finite differences and time stepping. the basic approach is relatively easy to understand and is an alternative to the more usual frequency-domain approaches. In order to take advantage of this, an interactive personal computer program based on FDTD has been developed. The program directly solves Maxwell's equation via finite differences. The solution is for one dimension, corresponding to normal incidence propagation through a planar stratified medium. The program displays an electromagnetic pulse as it propagates through the medium. Since Maxwell's equations are solved directly, the reflected and transmitted pulse amplitudes demonstrate how the reflection and transmission coefficients determine reflected and transmitted wave amplitudes. Since lossy material layers can be included, frequency dispersion can be demonstrated.
机译:时域有限差分法(FDTD)是电磁学中使用最广泛的计算方法之一。使用FDTF,可以通过有限差分和时间步长直接在时域中求解麦克斯韦方程组。基本方法相对容易理解,是更常见的频域方法的替代方法。为了利用这一点,已经开发了基于FDTD的交互式个人计算机程序。该程序通过有限差分直接求解麦克斯韦方程。该解决方案是一维的,对应于通过平面分层介质的法向入射传播。程序在传播通过介质时显示电磁脉冲。由于麦克斯韦方程是直接求解的,因此反射和透射的脉冲幅度说明了反射和透射的系数如何确定反射和透射的波幅度。由于可以包括有损耗的材料层,因此可以证明频率色散。

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