Abstract
This paper reports the differences in the transmittance characteristics in the X and Ku band (8–18 GHz) of thick film and thin film microstripline due to leaf overlay. Two types of leaves are studied — Tradescantia (Magenta coloured leaf) and Pothas Scandens (Green leaf). The changes in the moisture content in the leaf produces frequency, surface, orientation and type of metallization dependent changes in the characteristics of the microstriplines. Thick film and thin film microstriplines react differently when there is deficiency of chlorophyll in the leaf overlay. An approximate estimate of the effective dielectric constant of the leaf has been made using the overlay technique. It is felt that thick film microstripline with leaf overlay can be used to monitor the moisture status of leafy vegetation in the 8–18 GHz frequency range.
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