The electric field distribution of a hybrid rectangular and circular waveguide resonator for use in granular material dielectric measurements

Abstract

© 2015 The Institute of Electrical Engineers of Japan. This paper represents a design for a hybrid rectangular and circular waveguide resonator. The resonator is designed specifically for the purpose of granular dielectric measurements, which resonates at 2.45 GHz. The electric field distributions of the proposed resonator will be compared against ordinary resonators, and illustrated using a 3D computer simulation of isosurfaces and their contours and 3D projections. In this simulation the properties of samples (paddies and soils) are loaded into each design, in order to observe the electrical field distributions of each sample. Next, the probability density functions (PDF) and cumulative distribution functions (CDF) shall be used to determine the probability of electric field distributions within each type of resonator. Each designed resonator was created in order to process real experiment circumstances. The experiments for each resonator were processed using 20 paddy samples and 20 soil samples, in order to replicate real circumstances in an efficient manner. The percentages of moisture content (%MC) from each design were compared against %MC obtained using dry weight methodology, used to find errors. From the results, mean square error (MSE) shows that the hybrid resonator can improve output greater than the ordinary resonators, which are the rectangular resonator and circular resonator, with 78.738% and 63.213% respectively for paddy sample, and 70.605% and 46.520% respectively for soil sample, respectively. This demonstrates that the proposed resonator creates better results than the ordinary resonators, although the sample is changed.