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Paper Details

Dependence of Emissive Properties on Incident Angles for Tree Leaves Studied At Microwave Frequencies

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

Journal Title:Journal of Chemical, Biological and physical sciences

Experimental results on the complex dielectric constant of tree leaves at Xband microwave frequencies (9.3, 10.5 and 11.2 GHZ) are reported. Leaves from two tree species viz., Azadirachta indica (Neem) and Acacia indica (Babool), have been used in these measurements. Our results indicate that dielectric constant (?') for the leaves of Azadirachta indica lie over a range 1.25 to 7.0 when their gravimetric MC (%) (wet basis) changed from 0 % (oven dry) to around 65 % and for the leaves of Acacia indica lie over a range 1.25 to 7.6 when their gravimetric moisture content (wet basis) changed from 0 % (oven dry) to around 72 %. The corresponding values of dielectric loss (?'') for the leaves of both tree species are also found to increase with increase in their MC. Further, the estimations of emissivity at different incident angles are made from the experimentally measured values of dielectric constants of these tree leaves by using emissivity model for vertical and horizontal polarizations. It is concluded that the emissivity of tree leaves decreases with increasing MC / dielectric constants for both vertical and horizontal polarizations. For same values of MC (%), the emissivity for leaves of both the tree species increases for vertical polarization as the angle of incidence is increased whereas for horizontal polarization, its value decreases with increase in angle of incidence. These results on the complex dielectric constants and emissivities for tree leaves at microwave frequencies have potential applications in remote sensing and mobile and other communications at GHz range.