Dielectric measurement of azadirachta indica (bark) at 9.85 ghz frequency

The effect of packing density, moisture content and temperature on dielectric parameters such as dielectric constant (ε'), dielectric loss (ε"), loss tangent (tan), relaxation time (τp), conductivity (σp) for Azaditrachta Indica (bark) in powder form was assessed. The results show that there was a systematic increase in dielectric constant (ε') and loss factor (ε") with increasing values of relative packing fraction (δr) and decrease in dielectric constant and loss factor with increasing temperature. The moisture percentage measured by Thermo-gravimetric method. The water jacket was provided with fittings for connection with flexible rubber tubing to constant temperature circulator. The digital thermometer connected to water jacket to read temperature directly. Experimental results of different relative packing fractions were further used to obtain transformation to 100% solid bulk using correlation equations of Landau-Lifshitz- Looyenga and Bottcher. Result shows that, there is a fair agreement between experimental values and theoretical values of different dielectric parameters.