Property Measurement Errors Based on Application of an Estimation Equation Using the Coaxial Probe Method
Property Measurement Errors Based on Application of an Estimation Equation Using the Coaxial Probe Method
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基于同轴探针法估计方程应用的特性测量误差
DOI：
10.1109/imarc45935.2019.9118702
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
Masaki Kobayashi
中科院分区：
文献类型：
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作者：
K. Shibata;Masaki Kobayashi
采用电磁分析方法计算了等效电路中由于不考虑辐射电阻而产生的介电常数估计误差。这支持了一个方程的推导，用于估计未知材料的电介质测量与与同轴探头接触的参考材料的S11值相比的这种误差。采用0.50、1.5和3.0 GHz频率进行计算。具体:1。各种液体的介电常数最初是根据作者先前检查的参考和未知材料确定的。2. S11值通过基于横向EM分析的MoM（矩量法）方法计算，该方法使用的模型假设使用同轴探头和与夹具接触的各种液体进行实际测量。3. 将介电常数和S11值代入方程，用于估计未知材料与参考材料的介电特性。4. 计算了用该方程估计的介电常数与S11计算设置的介电常数之差。5. 在各种频率和未知材料条件下，在推导估计方程时确定了等效电路物理结构差异引起的复介电常数误差。结果表明，以纯水为参比物质的方程计算出的甲醇复介电常数随频率的增加而小于真实值。估计误差也随着频率的增加而增加，在3.0 GHz时显示的值在4.012%到11.456%之间。
EM (electromagnetic) analysis was applied to calculate dielectric constants estimation errors caused by non-consideration of radiation resistance in an equivalent circuit. This supported the derivation of an equation for the estimation of such errors with dielectric measurement for an unknown material compared to the S11 value with a reference material in contact with a coaxial probe. Frequencies of 0.50, 1.5 and 3.0 GHz were applied for calculation. Specifically: 1. The dielectric constants of various liquids were initially set on the basis of reference and unknown materials previously examined by the author. 2. S11 values were calculated via the MoM (method of moments) approach based on transverse EM analysis using a model with the assumption of actual measurement using a coaxial probe and various liquids in contact with the jig. 3. The dielectric constant and S11 values were substituted into the equation used to estimate the dielectric properties of an unknown material as compared with a reference material. 4. The dielectric constant difference between values estimated using this equation and the values set for S11 computation was calculated. 5. Complex permittivity errors caused by differences in the physical structure of the equivalent circuit in derivation of the estimation equation were determined under various conditions of frequency and unknown materials. The results showed that the complex permittivity of methanol estimated using the equation with pure water as the reference material, by way of example, became smaller than the true value as the frequency increased. The estimation error was also found to increase with frequency, showing values between 4.012 and 11.456% at 3.0 GHz.