An Introduction to the Theory of Electromagnetic Waves - COMSOL
The most important equations for electromagnetic waves are summarized in the following table: Here, is the magnetic flux through the closed contour C, while is the surface current … See more
To derive a single second-order wave equation for the electric field, first assume that the material is time invariant. The permeability can then … See more
It is possible to derive a second-order wave equation by means of the magnetic vector potential. To do so, start by assuming the temporal gauge, , together with the definition of the vector potential,, and substitute them into Maxwell–Ampère's … See more
Maxwell's equations in a medium characterized by an electric permittivity, ; magnetic permeability, ; and electric conductivity,, take … See more
In free space,, , and . The equation for the electric field can be put on the form: An equivalent formulation is: where the speed of light is: Gauss's law in free space is , which together with the vector identity: gives the following, and perhaps more familiar, form of the … See more
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基于迭代反演的非磁性材料复介电常数测量及初值选取 …
Web联系方式. 复介电常数是反映材料宏观电磁性质的重要参数, 电磁领域相关材料和器件的选取、设计及应用都必须基于材料在工作频段的电磁参数. 数值迭代法是反演计算材料复介电常数的重要方法, 但一直存在难以准确给出迭 …
Web给出迭代初始值的问题. 本文基于吸波材料介电常数与反射率的关系, 提出了一种迭代法反演吸波材料介电 常数的初值选取方法, 以此为基础构建了一种利用反射参数反演计算单层 …
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传输/反射法测量固体复介质材料介电常数
Web摘 要 介绍/ 传输反射法测量固体介质材料复介电常数等关键技术难点,通过建立固体介质材料的介电谱和磁谱测量装置, 开展复介电常数、 复磁导率、 复损耗角正切测量技术研究, …
模拟电磁波问题中的金属对象 | COMSOL 博客
Web其中 \mu_r 和 \epsilon_r 都可以是复数值。 在极高的频率（接近光学波段）下，材料接近等离子共振，我们实际上会通过复数值介电常数来表征 …
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Web在微波介质材料使用过程中，由于使用环境的影响，介质材料的电磁参数会发生变化，准确测量变温情 况下的电磁参数成为重中之重。本文主要介绍变温介电常数的常用方法进行了 …
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An Introduction to Electroquasistatics Theory - COMSOL
WebFeb 13, 2019 · This type of spectrometer sorts particles by using a clever combination of a static and time-harmonic electric potential, . By tuning the harmonic frequency (here, at 4 …
Web复介电常数是反映材料宏观电磁性质的重要参数，电磁领域相关材 料和器件的选取、设计及应用都必须基于材料在工作频段的电磁参数。 数值迭代法是反演计算材料复介电常数的 …
5.10 复介电常数和复磁导率_哔哩哔哩_bilibili
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