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首页> 外文期刊>IEEE Geoscience and Remote Sensing Letters >Electromagnetic Parameters of Dielectric and Magnetic Mixtures Evaluated by Time-Domain Reflectometry
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Electromagnetic Parameters of Dielectric and Magnetic Mixtures Evaluated by Time-Domain Reflectometry

机译：时域反射法评估介电体和电磁混合物的电磁参数

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摘要

The frequency-domain analysis of time-domain reflectometry (TDR) data can be used to evaluate the electromagnetic (EM) parameters of a sample under test. The goal of this letter was to use TDR to determine EM parameters, assumed to be frequency independent, for various magnetite/glass-beads mixtures. The EM parameters are, in turn, used to determine the velocity and attenuation of propagating waves. The latter quantity is also obtained through the TDR voltage method. Velocities decrease, and attenuations increase with increasing magnetite content. The measurements of the present work are compared with the velocities and attenuations reported in the literature (measured via the network analyzer (NA) and LCR meter techniques). The velocities calculated using the various methods are in good agreement. In contrast, the attenuations determined by fitting the TDR data only agree with the NA measurements at high frequencies (450 MHz), while those obtained by the TDR voltage method match the low-frequency attenuations determined through the LCR meter. The reasons for these behaviors are discussed, and the need for precise handling of the TDR data is emphasized. The TDR fit procedure is recommended to obtain reliable EM parameters of materials.
机译：时域反射仪（TDR）数据的频域分析可用于评估被测样品的电磁（EM）参数。这封信的目标是使用TDR来确定各种磁铁矿/玻璃珠混合物的EM参数，假定它们与频率无关。 EM参数又用于确定传播波的速度和衰减。后者的数量也可以通过TDR电压法获得。随着磁铁矿含量的增加，速度降低，衰减增加。将当前工作的测量结果与文献中报道的速度和衰减进行比较（通过网络分析仪（NA）和LCR测量仪技术进行测量）。使用各种方法计算出的速度非常吻合。相反，通过拟合TDR数据确定的衰减仅与高频（450 MHz）下的NA测量值一致，而通过TDR电压法获得的衰减与通过LCR计确定的低频衰减匹配。讨论了这些行为的原因，并强调了对TDR数据进行精确处理的需求。建议使用TDR拟合程序以获得可靠的材料EM参数。

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