The design, analysis, and fabrication of a prototype triaxial applicator is described. The applicator provides both reflected and transmitted signals that can be used to characterize the electromagnetic properties of materials in situ. A method for calibrating the probe is outlined and validated using simulated data. Fabrication of the probe is discussed, and measured data for typical absorbing materials and for the probe situated in air are presented. The simulations and measurements suggest that the probe should be useful for measuring the properties of common radar absorbing materials under usual in situ conditions.
Karuppuswami, S., Rothwell, E., Chahal, P., & Havrilla, M. J. (2018). A Triaxial Applicator for the Measurement of the Electromagnetic Properties of Materials. Sensors, 18(2), 383. https://doi.org/10.3390/s18020383