Study of <i>Q</i>ᵤ-Based Resonant Microwave Sensors and Design of 3-D-Printed Devices Dedicated to Glucose Monitoring

Juan, Carlos G.; Potelon, Benjamin; Quendo, Cédric; García-Martínez, Héctor; Ávila-Navarro, Ernesto; Bronchalo, E.; Navarro, José María Sabater

doi:10.1109/tim.2021.3122525

Cited by 29 publications

(24 citation statements)

References 78 publications

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“…In many cases, the permittivity is expressed using dielectric constant and imaginary part. The imaginary part of the complex permittivity of the material under test (MUT) can be expressed by loss tangent, which can be written as [19]: As seen in Figure 5a, the resonant frequencies for the circular and rectangular CSRR structure are 2960 MHz and 2440 MHz, respectively, which is consistent with the results of the equivalent circuit in Figure 2. The frequency shift when ε r = 90 of the circular CSRR structure is 110 MHz, and it is 80 MHz for the rectangular CSRR structure.…”

Section: Quality Factorsupporting

confidence: 70%

Section: Quality Factormentioning

confidence: 99%

“…In recent years, microwave sensors using the resonance method have become increasingly popular. Structures such as the split-ring resonator (SRR), complementary spiral resonator (CSR), and complementary split ring resonator (CSRR) are the most commonly used ones in the design of microwave liquid sensors [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. Examples of SRR structure can be found in Refs.…”

Section: Introductionmentioning

confidence: 99%

“…Juan et al [17] developed a concentration sensor using the Q factor and the maximum S 21 of the resonance as sensing magnitudes. Juan et al [19] modified this design using certified biocompatible material. The structure was fabricated by 3D printing, which provides stronger interaction between the electromagnetic fields and the sample.…”

Section: Introductionmentioning

confidence: 99%

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A Sensor for Characterisation of Liquid Materials with High Permittivity and High Dielectric Loss

Wang

Liu

Huang

et al. 2022

Sensors

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This paper reports on a sensor based on multi-element complementary split-ring resonator for the measurement of liquid materials. The resonator consists of three split rings for improved measurement sensitivity. A hole is fabricated at the centre of the rings to accommodate a hollow glass tube, through which the liquid sample can be injected. Electromagnetic simulations demonstrate that both the resonant frequency and quality factor of the sensor vary considerably with the dielectric constant and loss tangent of the liquid sample. The volume ratio between the liquid sample and glass tube is 0.36, yielding great sensitivity in the measured results for high loss liquids. Compared to the design based on rectangular split rings, the proposed ring structure offers 37% larger frequency shifts and 9.1% greater resonant dips. The relationship between dielectric constant, loss tangent, measured quality factor and resonant frequency is derived. Experimental verification is conducted using ethanol solution with different concentrations. The measurement accuracy is calculated to be within 2.8%, and this validates the proposed approach.

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Section: Quality Factorsupporting

confidence: 70%

Section: Quality Factormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Sensor for Characterisation of Liquid Materials with High Permittivity and High Dielectric Loss

Wang

Liu

Huang

et al. 2022

Sensors

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“…For one person, nearly all values could be classified in A, whereas the results of another person with the same RNN had also values in the high risk zone D. Nevertheless, due to the small number of test persons (6), the reason for the deviation was not further investigated. In addition, resonator-based measurement systems were proposed by Jang et al [139] and Juan et al [161]. In [139], 100% of the sensor readings fell in zone A, whereas in [139] up to 93.11% were in zones A and B and 6.89% in zone D. Therefore, the results of [139] outperformed commercial sensors.…”

Section: Evaluation With Clarke Error Gridmentioning

confidence: 99%

Commercial and Scientific Solutions for Blood Glucose Monitoring—A Review

Xue

Thalmayer

Zeising

et al. 2022

Sensors

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Diabetes is a chronic and, according to the state of the art, an incurable disease. Therefore, to treat diabetes, regular blood glucose monitoring is crucial since it is mandatory to mitigate the risk and incidence of hyperglycemia and hypoglycemia. Nowadays, it is common to use blood glucose meters or continuous glucose monitoring via stinging the skin, which is classified as invasive monitoring. In recent decades, non-invasive monitoring has been regarded as a dominant research field. In this paper, electrochemical and electromagnetic non-invasive blood glucose monitoring approaches will be discussed. Thereby, scientific sensor systems are compared to commercial devices by validating the sensor principle and investigating their performance utilizing the Clarke error grid. Additionally, the opportunities to enhance the overall accuracy and stability of non-invasive glucose sensing and even predict blood glucose development to avoid hyperglycemia and hypoglycemia using post-processing and sensor fusion are presented. Overall, the scientific approaches show a comparable accuracy in the Clarke error grid to that of the commercial ones. However, they are in different stages of development and, therefore, need improvement regarding parameter optimization, temperature dependency, or testing with blood under real conditions. Moreover, the size of scientific sensing solutions must be further reduced for a wearable monitoring system.

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Solute Concentration Sensing in Aqueous Solutions with Coupled Microstrip Resonators

Potelon,

Bronchalo,

Juan

et al. 2024

Lecture Notes in Electrical Engineering

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Study of Qᵤ-Based Resonant Microwave Sensors and Design of 3-D-Printed Devices Dedicated to Glucose Monitoring

Cited by 29 publications

References 78 publications

A Sensor for Characterisation of Liquid Materials with High Permittivity and High Dielectric Loss

A Sensor for Characterisation of Liquid Materials with High Permittivity and High Dielectric Loss

Commercial and Scientific Solutions for Blood Glucose Monitoring—A Review

Solute Concentration Sensing in Aqueous Solutions with Coupled Microstrip Resonators

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