Dielectric properties of dates at 2.45 GHz determined with a tunable single-mode resonant cavity.
A tunable TM012-mode resonant cavity with an additional tuning mechanism and working at 2.45 GHz has been designed, fabricated and tested for determination of dielectric properties of dates. The cavity has a Q-factor > 5000, and a tuning mechanism which gives it more flexibility and controllability. The cavity has been used for determining the dielectric properties of Rezaiz, the most common type of dates used in the production of data juice in the Eastern Province of the Kingdom of Saudi Arabia. The dielectric constant for this type of dates was 4.6 +/- 0.16, and the loss factor was 0.21 +/- 0.03, at 8.75% moisture. These results are comparable with the dielectric properties of some other fruits, of similar composition, at the same moisture level.
Dept. Ag. Engineering, King Faisal University, AL-Ahssa, Saudi Arabia.
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Ali
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al-Amri
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Dawoud