Abstract
The measurement of dielectric properties of a material based on the reflection in an open-ended waveguide is a simple and nondestructive technique, which does not require extracting any sample of the material to be measured. It is therefore of interest for the study of moisture content in materials, and also in the field of biomedical applications. The material one wishes to measure is placed on a flat metallic flange which terminates the waveguide, directing the microwave radiation within the material.
In order to determine the relationship between measured quantities such as VSWR and phase with the dielectric properties of the material, a theoretical study was carried out, considering the electromagnetic field near the aperture. Imposing the continuity of the tangential field components yields a dyadic Green’s equation, which is solved by numerical techniques. A computer program was set up to carry out the complete resolution of the problem. Results are presented and compared to experimental values. Finally, in order to provide a simpler relationship to the user, a third-order polynomial expansion was developed, which gives a good approximation of the exact values over specified ranges of the parameters.
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© 1983 Plenum Press, New York
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Cardiol, F.E., Sphicopoulos, T., Teodoridis, V. (1983). The Reflection of Open Ended Circular Waveguides Application to Nondestructive Measurement of Materials. In: Button, K.J. (eds) Reviews of Infrared and Millimeter Waves. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-7766-9_7
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DOI: https://doi.org/10.1007/978-1-4615-7766-9_7
Publisher Name: Springer, Boston, MA
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