A Dual-Band Resonator Sensor for Low Permittivity Characterization

Liu, Xiaoming; Zhang, Dan; Yu, Shuo; Wang, Chen; Yang, Xiaofan; Wang, Ye

doi:10.1109/tim.2022.3210937

Cited by 8 publications

(1 citation statement)

References 38 publications

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“…This change in the resonant frequency is a function of the permittivity of the material under test (MUT) [ 4 ]. Numerous structures for characterizing solids with planar and nonplanar sensors have been proposed [ 5 , 6 , 7 , 8 ]. Recent work on dielectric measurements of dielectric sheets has been reported in [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Relative Permittivity Measurement of Microliter Volume Liquid Samples through Microwave Filters

Yasin

Gogosh

Sohail

et al. 2023

Sensors

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This paper proposes a concept of dielectric characterization of low-volume liquid samples using the coupling coefficient of filters. The concept is validated through a two-pole substrate integrated waveguide filter in which the liquid under test is mounted on the coupling section between the two resonators. Unlike the conventional resonator perturbation method reported many times in the literature, this technique uses the coupling coefficient for sensing. The liquid sample is collected in a capillary tube and carefully positioned on the coupling section of the filter; the coupling coefficient of the two resonators varies compared to the relative permittivity of the sample; thus, an empirical model is established. The proposed sensor has been tested to compute the permittivity of different alcohols. Binary solutions of ethanol and water have also been characterized to calculate the volume ratio and relative permittivity as a proof-of-concept. The obtained results show that the proposed sensing technique is capable of characterizing a low quantity of liquids (≈44 µL) with good accuracy, and a worst case measured error of only 6.8% is noted. The ease of integration with other circuitry, low cost, reusability with no deterioration, and adaptability of the proposed sensor makes it a suitable choice for the chemical as well as for the pharmaceutical industry.

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