用扩散模型估计密集围场中的混响电磁场

J. Yan, J. Dawson, A. Marvin
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引用次数: 3

摘要

外壳保护其内容物免受电磁干扰的能力是通过其屏蔽效能来量化的。以往的研究已经证明,外壳的内容物可以极大地改变内部场,从而改变屏蔽效果。功率平衡法是分析密集围场屏蔽问题的有效方法。功率平衡法的一个假设是,在稳定状态下,箱体内的电磁场是均匀的。然而,在实际情况下,外壳中损耗的存在往往会损害场的均匀性,并且功率平衡方法可能变得不准确。先前已经提出了一种扩散方程方法来克服这个问题。本文利用扩散模型预测了密集围场的内部电磁场,并将其与功率平衡法、全波电磁求解器和测量得到的电磁场进行了比较,验证了扩散模型的有效性。扩散模型和功率平衡方法的比较表明,对于密集的外壳,内部电磁场随位置的变化而变化,扩散模型允许观察到这一点。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Estimating Reverberant Electromagnetic Fields in Populated Enclosures by Using the Diffusion Model
The ability of an enclosure to protect its contents from electromagnetic interference is quantified by its shielding effectiveness. Previous research has proved that the contents of an enclosure may greatly change the internal field and thus the shielding effectiveness. The power balance method is an efficient approach to analyze shielding problems of populated enclosures. One assumption of the power balance method is that in the steady state, the electromagnetic field in an enclosure is homogeneous. In actual circumstances, however, the presence of losses in an enclosure often compromises the field homogeneity and the power balance method may become inaccurate. A diffusion equation approach has been previously proposed to overcome this problem. In this paper, we predict the internal electromagnetic field of a populated enclosure by using the diffusion model, and compare them with the fields obtained by the power balance method, a fullwave electromagnetic solver and measurements, to demonstrate its efficacy. Comparisons between the diffusion model and the power balance method show that for populated enclosures, the internal electromagnetic field varies with position and that the diffusion model allows this to be observed.
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