ASABE Technical Library - Abstract

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A Substrate Integrated Waveguide Sensor for Measurement of Dielectric Properties of Biomass Materials.

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2016 ASABE Annual International Meeting  162461429.(doi:10.13031/aim.20162461429)
Authors:   Murat Sean McKeown, Sakol Julrat, Samir Trabelsi, Ernest William Tollner
Keywords:   Biomass, dielectric constant, dielectric loss factor, microwave, moisture, sensing.

Abstract. Substrate integrated waveguide based sensors balance the performance and well known design techniques of classical waveguides with the cheaper and more adaptable aspects of planar circuits. Propagation characteristics are similar to waveguides with the design retaining many positive aspects of waveguide propagation such as high quality-factor, electromagnetic shielding, and high power handling capabilities. A substrate integrated waveguide sensor was designed by removing a portion of the metal layer of a double-sided copper clad circuit board to make a structure similar to a slotted waveguide antenna. Preliminary work has been performed to determine the feasibility of the design operating at frequencies between 2.0 and 4.0 GHz for determination of moisture content of sawdust. Results showed extraction of dielectric properties from the reflection coefficient could be achieved. Additionally dielectric properties of sawdust between 10.6% and 47.1% were determined.

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