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Paper Details

Dielectric and emissive properties of tree leaves at X- Band microwave frequencies

D. V. Ahire*, P. R. Chaudhari and Vidya D. Ahire

Journal Title:Journal of Chemical, Biological and physical sciences
Abstract


This study presents the experimental data of the measurements on complex dielectric constant of leaves from two tree species at X- band microwave frequencies (10.5 and 11.5 GHz). Leaves from two different tree species viz., Eucalyptus (Nilgiri) and Teak (Sag), have been used in these measurements. These measurements have been carried out by using Waveguide Cell Method. Initially, dielectric constants of freshly plucked leaves are measured. Then the gravimetric moisture content (wet basis) of the leaf sample was gradually reduced by drying it in a hot air oven at 50o to 60oC. Our results show that dielectric constant (?') for the leaves of Eucalyptus lie over a range 1.25 to 6.0 when their gravimetric MC (%) (wet basis) changed from 0 % (oven dry) to around 70 % and for the leaves of Teak (Sag) lie over a range 1.29 to 5.4 when their gravimetric moisture content (wet basis) changed from 0 % to around 50 %. The corresponding values of dielectric loss (?'') for the leaves of both tree species are also found to increase with increase in their MC. Our results also show a little decrease in the values of complex dielectric constants for the leaves samples of both tree species as the frequency is increased from 10.5GHz to 11.5 GHz. Further, our results show decrease in emissivity with increase in MC /dielectric constant. These results on the dielectric constants and emissivities for tree leaves at microwave frequencies have potential applications in remote sensing and mobile communications.

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