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This article was supported by the Polish National Agency for Academic Exchange under
Grant No. PPI/APM/2018/1/00048/U/001 and by National Center for Research and Development
within the scope of the project: “System for complex dielectric-permittivity-spectrum measurements
of powdery, liquid, and solid materials in 1 MHz–3 GHz frequency range” within program TANGO
V, agreement no. TANGO-V-C/0007/2021-00.
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.