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Differential permittivity sensor using microstrip terminated cross-shaped resonator structure for material characterization

Chi-Hou Chio, Cheng Teng, Kam-Weng Tam, Wai-Wa Choi, Pedro Cheong, Sut-Kam Ho

Article (2019)

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Abstract

A differential planar microwave resonator permittivity sensor for material characterization is proposed in this paper. The sensor is based on asymmetric terminated cross-shaped resonator (TCSR) to provide multi-band notch frequency characteristics, allowing permittivity measurement of a small dielectric material under test (MUT) with a single resonator. Differential sensing is robust against varying ambient factors that cause frequency variations in the measurements. The dielectric properties of the MUT can be measured from the difference in notch frequencies with the reference material. To illustrate the technique, a tri-band sensor is prototyped using the proposed resonator configuration to measure the permittivity of both solid and liquid samples. The empirical equations for the determination of the MUT permittivity in relation to the notch frequencies have been derived. The sensor operates at 0.97, 1.69, and 2.91 GHz with an average sensitivity of 1.18, 4.45, and 1.22 MHz, respectively. The measured results are in a good agreement with the theoretical analysis.

Uncontrolled Keywords

Microwave sensors, material characterization, permittivity sensors, differential sensors, cross-shaped resonator, microstrip technology

Subjects: 2500 Electrical and electronic engineering > 2500 Electrical and electronic engineering
2500 Electrical and electronic engineering > 2519 Microelectronics
2500 Electrical and electronic engineering > 2520 Microwave and millimeter-wave devices, circuits and technologies
Department: Department of Electrical Engineering
Research Center: CREER - Centre for Research in Radiofrequency Electronics
POLY-GRAMES - Advanced Research Centre in Microwaves and Space Electronics
Funders: Macao Science and Technology Development Fund, University of Macau Research Projects
Grant number: FDCT 014/2015/AMJ,, MYRG 2018-00076-FST
PolyPublie URL: https://publications.polymtl.ca/4822/
Journal Title: IEEE Access (vol. 7)
Publisher: IEEE
DOI: 10.1109/access.2019.2930747
Official URL: https://doi.org/10.1109/access.2019.2930747
Date Deposited: 20 Jul 2021 11:45
Last Modified: 11 Nov 2022 13:48
Cite in APA 7: Chio, C.-H., Teng, C., Tam, K.-W., Choi, W.-W., Cheong, P., & Ho, S.-K. (2019). Differential permittivity sensor using microstrip terminated cross-shaped resonator structure for material characterization. IEEE Access, 7, 101960-101968. https://doi.org/10.1109/access.2019.2930747

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