A Broadband Complex Permittivity Probe Using Stepped Coaxial Line
Somporn Seewattanapon, Prayoot Akkaraekthalin
DOI: 10.4236/jemaa.2011.38050   PDF    HTML     5,015 Downloads   9,176 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.

Share and Cite:

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.


[1] H. P. Schwan and K. R. Foster, “RF-Field Interactions with Biological System: Electrical Properties and Biophysical Mechanisms,” Proceedings of the IEEE, Vol. 68, No. 1, 1980, pp.104-113. doi:10.1109/PROC.1980.11589
[2] A. C. Metaxas and R. J. Meredith. “Industrial Microwave Heating,” Peter Peregrinus, London, 1988.
[3] C. Amatore, M. Berthou and S. Hebert. “Fundamental Principles of Electrochemical Ohmic Heating of Solutions,” Journal of Electroanalytical Chemistry, Vol. 457, No. 1-2, 1998, pp. 191-203. doi:10.1016/S0022-0728(98)00306-4
[4] S. O. Nelson, “Ag-ricultural Applications of Dielectric Measurements,” IEEE Transaction on Dielectrics and Electrical Insulation, Vol. 13, No. 4, 2006, pp. 688-702. doi:10.1109/TDEI.2006.1667726
[5] S. O. Nelson, “Dielec-tric Properties of Agricultural Products and Some Applica-tions,” Research in Agricultural Engineering, Vol. 54, 2008, pp. 104-112.
[6] A. Jasim, S. R. Hosahalli and G. S. R. Vijaya, “Dielectric Properties of Butter in the MW Frequency Range as Affected by Salt and Temperature,” Journal of Food Engineer-ing, Vol. 82, No. 3, 2007, pp. 351-358. doi:10.1016/j.jfoodeng.2007.02.049
[7] S. Seiichi and S. Naoki, “Dielectric Relaxation Time and Relaxation Time Dis-tribution of Alcohol-Water Mixtures,” The Journal of Physical Chemistry A, Vol. 106, No. 3, 2002, pp. 458-464.
[8] X. Bo-higas and J. Tejada, “Dielectric Characterization of Alcoholic Beverages and Solutions of Ethanol in Water under Microwave Radiation in the 1 - 20 GHz Range,” Food Research Interna-tional, Vol. 43, No. 6, 2010, pp. 1607-1613. doi:10.1016/j.foodres.2010.04.021
[9] T. W. Athey and M. A. Stuchly, “Measurement of Radio Frequency Permittivity of Biological Tissues with an Open-Ended Coaxial Line,” (Part 1 and 2) IEEE Transactions on Microwave Theory and Tech-niques, Vol. MTT-30, January 1982, pp. 82-92. doi:10.1109/TMTT.1982.1131021
[10] R. Zajícek, L. Oppl and J. VRBA, “Broadband Measurement of Complex Permit-tivity Using Reflection Method and Coaxial Probes,” Radio Engineering, Vol. 17, No. 1, April 2008, pp. 14-19.
[11] P. L. Somlo, “The Computation of Coaxial Line Step Capacitance,” IEEE Transactions on Mircrowave Theory and Techniques, Vol. MTT-15, No. 1, January 1967, pp. 48-53. doi:10.1109/TMTT.1967.1126368
[12] A. Jurkus, “Computa-tion of Step Discontinuities in Coaxial Line,” IEEE Transac-tions on Mircrowave Theory and Techniques, Vol. 20, No. 10, October 1972, pp. 708- 709. doi:10.1109/TMTT.1972.1127852
[13] W. K. Gwarek, “Computer-Aided Analysis of Arbitrarily Shaped Coaxial Dis-continuities,” IEEE Transactions on Mircrowave Theory and Techniques, Vol. 36, No. 2, 1988, pp. 337-342. doi:10.1109/22.3523
[14] G. B. Gajda and S. S. Stuchly, “Numerical Analysis of Open-Ended Coaxial Lines,” IEEE Transactions on Microwave Theory and Techniques, Vol. MTT-31, No. 5, May 1983, pp. 380-384. doi:10.1109/TMTT.1983.1131507
[15] L. S. Anderson, G. B. Gajda and S. S. Stuchly, “Dielectric Measurements Using a Rational Functional Model,” IEEE Transactions on Microwave Theory and Technique, Vol. 42, No. 2, 1994, pp. 199-204. doi:10.1109/22.275247
[16] U. Kaatze, “Complex Permittiv-ity of Water as a Function of Frequency and Temperature,” Journal of Chemical & Engineering Data, Vol. 34, No. 4, 1989, pp. 371-374. doi:10.1021/je00058a001

Copyright © 2024 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.