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Microwave Dielectric Properties of Unshelled and Shelled Peanuts

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  036169,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.15418)
Authors:   Samir Trabelsi, Stuart O. Nelson
Keywords:   Dielectric properties, Free space, Microwaves, Unshelled peanuts, Shelled peanuts, Bulk density, Moisture content.

Dielectric properties of unshelled and shelled peanuts were measured with a free-spacetransmission technique at room temperature (23 oC) between 2.0 and 18.0 GHz over wide ranges of bulk density and moisture content. For better accuracy and optimum use of the vector network analyzer (VNA) dynamic range, a pair of horn/lens antennas was used; and for each moisture level, the sample thickness was selected to keep the attenuation between 10 dB and the maximum attenuation measurable by the VNA; and time-domain gating was applied to the main response. Also, the sample was placed in a tunnel shaped enclosure of radiation-absorbing material to isolate it from surroundings. Variations of the dielectric properties with bulk density and moisture content are shown at 8 GHz and 23 oC. Data, normalized to the lowest bulk density for each sample with the Landau and Lifshitz, Looyenga mixture equation, are tabulated.

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