Measurement of Dielectric Constant of Thin Leaves by Moisture Content at 4mm Band

A complex dielectric constant for poplar and monstera delicious’s obtained by Ulaby at 10GHz has been revised at 4mm band. A measurement setup operating at 4mm was established for making comparison between modeled and measured values. Results basically show that their electromagnetic transparency increases by drying as expected. While moisture content increases from 0% to 60%, transmitted power decreases from 95% down to 22%; reflection goes up to 50% and the absorption reaches from 1% to 20% for monstera leaf. A model developed for poplar responds much better than the model revised for monstera leaves. Corresponding author: S. Helhel (selcukhelhel@akdeniz.edu.tr). † Also with KEYTEK Electronics Inc. Ltd. Coop., Antalya, Turkey. 184 Helhel, Colak, and Ozen