Power Loss, Attenuation and Electric Field Intensity Determination Of PCL/Rice Husk Using Numerical Technique for Microwave Application

Materials used as microwave absorbers for electromagnetic waves interference is dependent on the ability of such material to absorb or cutoff transmission of energy from the incident radiation. The measurement of these properties responsible for the absorption had been exploited using theoretical and experimental methods. There is a dearth in the use of numerical technique to calculate these properties in the field of radio frequency characterization. Finite element method (FEM) was used to calculate the power loss, attenuation and electric field intensity of an absorber placed inside a rectangular waveguide. For the calculation, five different thicknesses (5, 10, 15, 30, and 50 mm) of rice husk/PCL samples were used. The result of the numerical calculation showed that the power loss the 50 mm has the least power loss of 0.76 at 12 GHz, an attenuation of -16.57 GHz was obtained for the 50 mm thick substrate at 12 GHz and there was a decrease in the electrical field intensity as the substrates thickens. The results indicated that the 50 mm thick sample absorbs the highest radiation and is good for small radar absorber applications. The numerical technique used was able to calculate these parameters with ease and simplicity.