Title :
A simple and low-cost measurement system for the complex permittivity characterization of materials
Author :
Fratticcioli, Elisa ; Dionigi, Marco ; Sorrentino, Roberto
Author_Institution :
Univ. of Perugia, Italy
Abstract :
A microwave planar resonant sensor, its equivalent circuit, and the driving electronics for the measurement of the complex permittivity in compact areas of the material under test are presented. Compared to transmission or reflection sensors, the adoption of a scalar two-port measurement procedure reduces the cost of the system and improves its robustness. The measuring system requires only the calculation of two parameters, namely, the resonant frequency and the 3 dB bandwidth, thus achieving a substantial reduction of cost and computation time. Such a sensor can be adopted in moisture measurement systems, and its low cost is such as to allow its use even in a disposable manner.
Keywords :
equivalent circuits; microstrip resonators; microwave detectors; moisture measurement; permittivity measurement; bandwidth; computation time reduction; cost reduction; curve fitting; electronic circuits; equivalent circuit; material permittivity; measurement system; microstrip resonators; microwave planar resonant sensor; microwave transducers; moisture measurement; permittivity characterization; permittivity measurement; reflection sensors; resonant frequency; robustness; scalar measurement; transmission sensors; two-port measurement; Area measurement; Circuit testing; Costs; Electronic equipment testing; Equivalent circuits; Microwave sensors; Permittivity measurement; Resonance; Sensor phenomena and characterization; Sensor systems; Curve fitting; microstrip resonators; microwave transducers; moisture measurement; permittivity measurement;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2004.830753
