Next Article in Journal
Free Convection and Heat Transfer in Porous Ground Massif during Ground Heat Exchanger Operation
Previous Article in Journal
Design, Structural Inspection and Bio-Medicinal Applications of Some Novel Imine Metal Complexes Based on Acetylferrocene
 
 
Article

Complex Dielectric Permittivity Spectra of Rapeseed in the 20 MHz–3 GHz Frequency Range

1
Institute of Agrophysics, Polish Academy of Sciences, 20-290 Lublin, Poland
2
Department of Electrical Engineering and Electrotechnologies, Lublin University of Technology, 20-618 Lublin, Poland
3
Institute of Electronic Systems, Warsaw University of Technology, 00-665 Warsaw, Poland
4
Department of Physics, Faculty of Engineering, Slovak University of Agriculture in Nitra, SK-949 76 Nitra, Slovakia
*
Author to whom correspondence should be addressed.
Academic Editor: Christoforos Krontiras
Materials 2022, 15(14), 4844; https://doi.org/10.3390/ma15144844
Received: 3 June 2022 / Revised: 5 July 2022 / Accepted: 9 July 2022 / Published: 12 July 2022
Rapeseed is one of the most important sources of vegetable oil worldwide. Knowledge of the dielectric properties of rapeseed may be beneficial for moisture content determination and the optimization of microwave treatment processes. The aim of this research was to examine the complex dielectric permittivity spectra of rapeseed of moisture content from 8.3% to 16.1%. The measurements were performed in the 20 MHz–3 GHz frequency range with the use of a vector network analyzer and a coaxial transmission-line cell. The real part of dielectric permittivity significantly depended on the water content of the seeds. The obtained spectra were modeled with the use of a three-pole Debye model with bulk electrical conductivity. Because the highest-frequency pole was found near the high-frequency measurement band limit, the spectra were additionally modeled with the use of an approximate ABC model with two in-band Debye poles. The determined model parameters were found to be highly dependent on the water content of the seeds. The relations between these parameters and water content were analyzed. View Full-Text
Keywords: granular materials; dielectric spectroscopy; radio and microwave measurements; moisture content; rapeseed granular materials; dielectric spectroscopy; radio and microwave measurements; moisture content; rapeseed
Show Figures

Figure 1

MDPI and ACS Style

Kafarski, M.; Szypłowska, A.; Majcher, J.; Wilczek, A.; Lewandowski, A.; Hlaváčová, Z.; Skierucha, W. Complex Dielectric Permittivity Spectra of Rapeseed in the 20 MHz–3 GHz Frequency Range. Materials 2022, 15, 4844. https://doi.org/10.3390/ma15144844

AMA Style

Kafarski M, Szypłowska A, Majcher J, Wilczek A, Lewandowski A, Hlaváčová Z, Skierucha W. Complex Dielectric Permittivity Spectra of Rapeseed in the 20 MHz–3 GHz Frequency Range. Materials. 2022; 15(14):4844. https://doi.org/10.3390/ma15144844

Chicago/Turabian Style

Kafarski, Marcin, Agnieszka Szypłowska, Jacek Majcher, Andrzej Wilczek, Arkadiusz Lewandowski, Zuzana Hlaváčová, and Wojciech Skierucha. 2022. "Complex Dielectric Permittivity Spectra of Rapeseed in the 20 MHz–3 GHz Frequency Range" Materials 15, no. 14: 4844. https://doi.org/10.3390/ma15144844

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop