Main Article Content
A microwave free-space reflection method for determining the complex permittivity of planar materials is demonstrated. Improved the MUltiple SIgnal Classification (MUSIC) algorithm to estimate the complex relative permittivity of material based on the reflection coefficients measurement of a metal-backed material sample placed in a free-space with the thickness of the samples is the much greater time the wavelength. The measurement system consists of a pyramidal horn antenna operating at X-band and a metal-backed sample placed in a free-space. From the measured values of the reflection coefficients through a known thickness of a planar slab of the material sample, the complex relative permittivity of the material samples is estimated by the proposed algorithm without determining an integer time the wavelength in the sample under test. The proposed algorithm is verified with different thickness material samples at X-band. The estimation results show that the complex relative permittivity of material samples is accurately when thickness changes.
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
D. K. Ghodgaonkar, V. V. Varadan, and V. K. Varadan, "A free-space method for measurement of dielectric constants and loss tangents at microwave frequencies," IEEE Transactions on Instrumentation and Measurement, vol. 38, pp. 789-793, 1989.
Ghodgaonkar. D. K, Varadan. V. V, and Varadan. V. K, "Free-space measurement of complex permittivity and complex permeability of magnetic materials at microwave frequencies," Instrumentation and Measurement, IEEE Transactions on, vol. 39, pp. 387-394, 1990.
S. K. A. Kraszewski, and Z. Stosio, "A preliminary study on microwave monitoring of moisture content in wheat," J. Microw. Power, vol. 12, no.3, pp. 241-252, 1977.
M. K. a. E. Kress-Rogers, "Microwave moisture and density measurements in particulate solids," Trans. Inst. Meas. Control, vol. 8, no3, pp. 161-168, 1986.
S. Trabelsi, A. W. Kraszewski, and S. O. Nelson, "Simultaneous determination of density and water content of particulate materials by microwave sensors," Electronics Letters, vol. 33, pp. 874-876, 1997.
E. Håkansson, A. Amiet, and A. Kaynak, "Electromagnetic shielding properties of polypyrrole/polyester composites in the 1-18GHz frequency range," Synthetic metals, vol. 156, pp. 917-925, 2006.
V. V. Varadan and R. Ro, "Unique Retrieval of Complex Permittivity and Permeability of Dispersive Materials From Reflection and Transmitted Fields by Enforcing Causality," IEEE Transactions on Microwave Theory and Techniques, vol. 55, pp. 2224-2230, 2007.
V. N. Semenenko and V. A. Chistyaev, "Measurement methods of complex permittivity and permeability of sheet samples in free space in microwave range," In 20th International Crimean Conference Microwave & Telecommunication Technology, pp. 1091-1092, 2010.
J. Roelvink and S. Trabelsi, "Measuring the complex permittivity of thin grain samples by the free-space transmission technique," In Instrumentation and Measurement Technology Conference (I2MTC), IEEE International, pp. 310-313, 2012.
R. A. Fenner and S. Keilson, "Free space material characterization using genetic algorithms," In Antenna Technology and Applied Electromagnetics (ANTEM), 2014 16th International Symposium on, pp. 1-2, 2014.
K. Haddadi and T. Lasri, "Geometrical Optics-Based Model for Dielectric Constant and Loss Tangent Free-Space Measurement," IEEE Transactions on Instrumentation and Measurement, vol. 63, pp. 1818-1823, 2014.
N. A. Andrushchak, I. D. Karbovnyk, K. Godziszewski, Y. Yashchyshyn, M. V. Lobur, and A. S. Andrushchak, "New Interference Technique for Determination of Low Loss Material Permittivity in the Extremely High Frequency Range," IEEE Transactions on Instrumentation and Measurement, vol. 64, pp. 3005-3012, 2015.
T. Tosaka, K. Fujii, K. Fukunaga, and A. Kasamatsu, "Development of Complex Relative Permittivity Measurement System Based on Free-Space in 220-330 GHz Range," IEEE Transactions on Terahertz Science and Technology, vol. 5, pp. 102-109, 2015.
H. Altschuler, "Dielectric constant," In Handbook of Microwave Measurements, M. Sucher and J. Fox, Eds. Brooklyn, NY: Polytechnic Press, Vol. 3, 1963.
A. Klein, "Microwave moisture determination of coal - A comparison of attenuation and phase measuremen," In Proc. 10th Euro. Microwave Conf., vol. 1, pp. 526-530, 1980.
P. J. Joseph, , J. C. Joseph, D. P. Glynn, III, and T.D. Perkins, III, "A portable vector reflectometer and its application for thickness and permittivity measurements," Microwave J., vol. 2, no. 12, pp. 84-90, 1994.
S. Trabelsi, A.W. Kraszewski, and S. O. Nelson, "Phase-shift ambiguity in microwave dielectric properties measurements," IEEE Transactions on Instrumentation and Measurement, vol. 49, pp. 56-60, 2000.
R. Schmidt, "Multiple emitter location and signal parameter estimation," IEEE Transactions on Antennas and Propagation, vol. 34, pp. 276-280, 1986.
I. P. Arvind Roy, "Design and Analysis of X band Pyramidal Horn Antenna Using HFSS," International Journal of Advanced Research in Electronics and Communication Engineering, vol. 4, pp. 488-493, 2015.
Dell'Aversano, A., Natale, A., & Solimene, R. (2016). Comparison between different decorrelation techniques in vital sign detection. Advanced Electromagnetics, 5(2), 53-58.