A Broadband Complex Permittivity Probe Using Stepped Coaxial Line

DOI: 10.4236/jemaa.2011.38050   PDF   HTML     4,124 Downloads   7,512 Views   Citations


This paper proposes the stepped coaxial line sensor using the reflection coefficient in microwave range for complex permittivity measuring. The proposed probe is adapted from the conventional SMA connector which is cheap and easy to fabricate. The analysis model of the probe has been done by using FDTD method with the reference material such as the distilled water. The stepped SMA probe presents the accurate result compared with the convention one. The permittivity values of the concentrated alcohols of 10%, 15% and 20% as DUTs at 24oC in a frequency range of 0.1 GHz to 6 GHz have been measured using the proposed probe. Also, the measurement of salted butter permittivity has been performed. The measured results are more accurate compared with the commercial probe.

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S. Seewattanapon and P. Akkaraekthalin, "A Broadband Complex Permittivity Probe Using Stepped Coaxial Line," Journal of Electromagnetic Analysis and Applications, Vol. 3 No. 8, 2011, pp. 312-318. doi: 10.4236/jemaa.2011.38050.

Conflicts of Interest

The authors declare no conflicts of interest.


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