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相关概念视频

Lossless Lines01:23

Lossless Lines

114
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,...
114
Transmission-Line Differential Equations01:26

Transmission-Line Differential Equations

237
Transmission lines are essential components of electrical power systems. They are characterized by the distributed nature of resistance (R), inductance (L), and capacitance (C) per unit length. To analyze these lines, differential equations are employed to model the variations in voltage and current along the line.
Line Section Model
A circuit representing a line section of length Δx helps in understanding the transmission line parameters. The voltage V(x) and current i(x) are measured...
237
Susceptibility, Permittivity and Dielectric Constant01:26

Susceptibility, Permittivity and Dielectric Constant

1.4K
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.
1.4K
Boundary Conditions: Lossless Lines01:21

Boundary Conditions: Lossless Lines

88
Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
At the receiving end, the boundary condition states that the voltage equals the product of the receiving-end impedance and current. This relationship is expressed as a function of the incident and...
88
Lossy Lines and Overvoltages01:22

Lossy Lines and Overvoltages

87
Transmission-line series resistance and shunt conductance cause three primary effects: attenuation, distortion, and power losses.
Attenuation
When constant series resistance and shunt conductance are present, voltage and current equations are modified. The propagation constant indicates that voltage and current waves consist of both forward and backward traveling components. These waves attenuate as they propagate, with the attenuation factor related to the resistance and conductance. In a...
87
Resistance and Conductance01:25

Resistance and Conductance

73
A conductor's DC resistance at a given temperature is influenced by its resistivity, length, and cross-sectional area. Resistivity is an inherent property of the conductor material, with annealed copper serving as the international standard for measurement. For instance, the resistivity of hard-drawn aluminum at 20 degrees Celsius is 61% of the standard conductivity of annealed copper.
Various factors impact the resistance of a conductor. Spiraling in stranded conductors increases their...
73

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相关实验视频

Updated: Jun 9, 2025

Recombination Dynamics in Thin-film Photovoltaic Materials via Time-resolved Microwave Conductivity
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Recombination Dynamics in Thin-film Photovoltaic Materials via Time-resolved Microwave Conductivity

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一种改进的双端口输电线路允许性和透性确定方法,采用缩短样本.

Derek A Houtz1, Dazhen Gu1, David K Walker1

  • 1RF Technology Division, National Institute of Standards and Technology (NIST), Boulder, CO 80305 USA.

IEEE transactions on microwave theory and techniques
|October 30, 2024
PubMed
概括
此摘要是机器生成的。

一种新的测量技术提高了复杂的允许性和透性测定的准确性. 该方法使用短路样本反射度测量来减少低损耗材料中共振引起的不确定性.

关键词:
介电测量 介电测量微波炉可以使用微波炉.透性 透性的允许性的允许性.主要模式 主要模式这是一个共振共振.波导波导是指导波的

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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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Characterization of Thermal Transport in One-dimensional Solid Materials
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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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Characterization of Thermal Transport in One-dimensional Solid Materials
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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
  • 微波工程 微波工程

背景情况:

  • 传统的方法来确定复杂的允许性和透性可能会受到共振效应的影响,导致显著的不确定性,特别是对于低损耗材料.
  • 当样本厚度是指导半波长的整数倍时,这些不确定性就会产生,这使材料属性适配变得复杂.
  • 现有的技术,如尼科尔森 - 罗斯 - 韦尔 (NRW) 解决方案和国家标准与技术研究所 (NIST) 代方法在处理这些共振问题方面存在局限性.

研究的目的:

  • 引入一种改进的测量技术和非线性最小方程解决方案,以准确地确定复杂的电容性和透性.
  • 为了减轻在传统方法中遇到的低损失样本中的共振效应引起的不确定性.
  • 提高材料性能测量的可靠性和减少不确定性.

主要方法:

  • 采用双端口S参数测量和短路样本的新型单端口测量的组合.
  • 使用非线性最小二次方程解决方法来适应材料属性.
  • 引入了短射反射度测量 (S11) 以提高准确性并减少与标准双端口测量相比的不确定性.

主要成果:

  • 拟议的技术显著减少了与共振效应相关的不确定性.
  • 获得的复杂的透性和透性值显示出更光滑的配置文件和更低的不确定性.
  • 在WR42波导中对造环氧和费里特加载的微波吸收器样本进行验证,并进行有限元模拟.

结论:

  • 经过修改的测量技术,包括短距离样本反射度测量,为复杂材料性质的确定提供了更高的准确性和更低的不确定性.
  • 这种方法有效地克服了在处理低损耗材料和共振现象时传统技术的局限性.
  • 通过实验结果和模拟来证明增强的准确性,为材料表征提供了更可靠的方法.