Progress In Electromagnetics Research M
ISSN: 1937-8726
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By S. Jain, P. K. Mishra, V. V. Thakare, and J. Mishra

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A miniaturized U-Shape patch sensor (15 mm×15 mm) was designed at dual resonating frequencies (fr) 5.2 GHz and 6.8 GHz). The proposed design printed on FR4 material with a thickness of 1.676 mm and relative permittivity 4.4. To simulate the performances of the proposed design, the CST Microwave Studio (CST MWS) was used. The reflection coefficient of U-Shape patch sensor was measured. Basmati rice was investigated, and bulk density was increased with increase of moisture content, hence varied from 554.3 to 591 kg/m3. It has the longest average rice length (L) 7.2 mm, average width (W) 1.61 mm, and L/W ratio 4.47. The percentage of moisture was varied from 10.12% to 20.35% calculated on a wet weight basis. The lowest mean relative error (MRE) determined between predicted moisture content (PMC) and actual moisture content (AMC) was 0.55% at dual frequencies.

S. Jain, P. K. Mishra, V. V. Thakare, and J. Mishra, "Microstrip Moisture Sensor Based on Microstrip Patch Antenna," Progress In Electromagnetics Research M, Vol. 76, 177-185, 2018.

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