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Susceptibility, Permittivity and Dielectric Constant01:26

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When placed in an external electric field, a dielectric material gets polarized. The charge density in the dielectric material is given by the sum of the bound and free charge densities, while the total charge density can also be written in terms of the total electric field. The bound charge density can be measured in terms of polarization, leading to the relationship between electric displacement and polarization.
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When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
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In electrical engineering, a lossless transmission line is characterized by a purely imaginary propagation constant and a resistive characteristic impedance. The ABCD parameters, which describe the relationship between the input and output voltages and currents, indicate an equivalent π circuit with an imaginary series impedance and a shunt admittance. This results in a transmission line that, when the product of the phase constant (beta) and the length of the line is less than pi,...
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Method Development for Contactless Resonant Cavity Dielectric Spectroscopic Studies of Cellulosic Paper
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一种自由空间测量方法用于低损耗介电特性,不需要先前采用样品厚度数据.

Sung Kim1, David Novotny1, Joshua A Gordon1

  • 1Communications Technology Laboratory, Radio Frequency Technology Division, National Institute of Standards and Technology, Boulder, CO 80305 USA.

IEEE transactions on antennas and propagation
|October 23, 2024
PubMed
概括

这项研究引入了一种新的自由空间测量技术,用于在毫米波频率下对低损耗介电材料进行表征,而不需要先前了解样品厚度. 该方法准确地确定复杂的电容性,这对于材料科学应用至关重要.

关键词:
这是一种比斯塔斯散射 (Bistatic scattering).介电性电容性 介电性电容性自由空间测量方法的测量方法边缘的光谱 边缘的光谱低损耗材料是一种低损耗材料.毫米波 (MMW) 测量方法散射参数包裹中的散射参数包裹

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科学领域:

  • 电磁学 电磁学 电磁学 电磁学
  • 材料科学 材料科学 材料科学
  • 超材料是指一种超材料.

背景情况:

  • 对介电材料属性的准确表征对于先进的电子和光子应用至关重要.
  • 现有的测量复杂电容性的方法通常需要精确地了解样本厚度,这限制了它们的适用性.
  • 毫米波频率对材料特征提出了独特的挑战,因为波长和相互作用的复杂性.

研究的目的:

  • 开发和验证一个自由空间测量方法,以确定在毫米波频率下低损耗介电材料的复杂电容性.
  • 消除在介电材料表征中对样品厚度的先验知识的需要.
  • 为提取的复杂允许度值提供全面的不确定性分析.

主要方法:

  • 使用传输散射参数的最大和最小包裹来确定电容性的实部分 (ε r ').
  • 估计样品厚度,基于确定的真实电容性和分散参数峰值的频率.
  • 使用衍生厚度和散射数据计算出允许度的想象部分 (ε r ′′).

主要成果:

  • 在220-325 GHz范围内成功表征了四种不同的低损耗介电材料 (聚乙烯,聚四乙烯,聚甲基).
  • 证明了该方法在各种事件角度 (0°,10°,20°,30°) 的有效性.
  • 提供了明确的不确定性分析,并报告了与提取的复杂允许性相关的不确定性.

结论:

  • 本文所介绍的自由空间测量方法为在毫米波频率下对低损耗介电材料进行表征提供了强大而准确的方法.
  • 该技术与样品厚度的独立性简化了实验程序,并扩大了其实际效用.
  • 详细的不确定性分析提高了获得的物质性质数据的可靠性和可信性.