Coaxial to circular waveguide transition as high-precision easy-to-handle measuring cell for the broad band dielectric spectrometry of liquids
Coaxial to circular waveguide transition as high-precision easy-to-handle measuring cell for the broad band dielectric spectrometry of liquids
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DOI：
10.1088/0957-0233/7/4/010
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发表时间：
1996-04-01
影响因子：
2.4
通讯作者：
Petong, P
中科院分区：
文献类型：
--
作者：
Gottmann, O;Kaatze, U;Petong, P
对于在不连续平面上具有介电界面的同轴波导到圆波导的突变，输入导纳已被计算为频率和相关几何量和电学量的函数。应用模式匹配技术进行了计算，从理论上考虑得出了一个简单的集总元表示，该表示可以很好地描述在广泛的感兴趣的参数值范围内的不连续输入导纳。讨论了在时域和频域最适合作为介电测量样本单元的转换网络参数。试验测量结果表明，我们的数值预测与其他作者的精确电容值一致，也证明了这种电池的灵敏度和准确性。
For an abrupt transition from a coaxial to circular waveguide with a dielectric interface in the plane of discontinuity, the input admittance has been calculated as a function of frequency and of relevant geometrical and electrical quantities. The calculations have been performed applying a mode matching technique, A simple lumped-element representation has been derived from the theoretical considerations which was found to provide an excellent description of the input admittance of the discontinuity over a wide range of values of the parameters of interest. Network parameters are discussed for transitions that are most suited as sample cells for dielectric measurements in both the time domain and the frequency domain. Results from test measurements are reported to show the agreement of our numerical predictions with precise capacitance values of other authors and also to demonstrate the sensitivity and accuracy attainable with such cells.