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Compact Elliptical Multi-Band Microstrip Sensor for Thumb-Tissue Glucose Sensing.

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Title: Compact Elliptical Multi-Band Microstrip Sensor for Thumb-Tissue Glucose Sensing.
Authors: Yousif, Amjad H.1, Luhaib, Saad W. O.1 s.w.o.luhaib@uomosul.edu.iq, Thanoun, Mohammed Y.2
Source: Progress in Electromagnetics Research C. 2026, Vol. 168, p75-81. 7p.
Subjects: Blood sugar monitors, Microstrip resonators, Detectors, Microwave remote sensing, Imaging phantoms
Abstract: This paper presents a new compact triple-band elliptical microstrip resonator for noninvasive microwave-based glucose sensing using a thumb-contact configuration. The proposed sensor employs concentric elliptical rings with a localized slot and capacitive coupling to enhance electric-field confinement in the sensing region. A multilayer cylindrical thumb phantom incorporating dispersive tissue models and glucose-dependent blood permittivity is utilized to emulate realistic on-body conditions. Full-wave simulations in the 2-6 GHz band demonstrate three dominant glucose-sensitive resonances with monotonic frequency shifts over a concentration range of 0-600 mg/dL. The frequency deviation rates are 0.147, 0.64, and 1.037 MHz/(mg/dL), respectively, with the highest linearity reaching R² ≈ 0.98. By distributing sensing across multiple resonant modes, the proposed approach enables frequency-diverse feature extraction suitable for multivariate regression, improving robustness against contact variability and tissue heterogeneity compared to single-band configurations. [ABSTRACT FROM AUTHOR]
Copyright of Progress in Electromagnetics Research C is the property of Electromagnetics Academy and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: <searchLink fieldCode="AR" term="%22Yousif%2C+Amjad+H%2E%22">Yousif, Amjad H.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Luhaib%2C+Saad+W%2E+O%2E%22">Luhaib, Saad W. O.</searchLink><relatesTo>1</relatesTo><i> s.w.o.luhaib@uomosul.edu.iq</i><br /><searchLink fieldCode="AR" term="%22Thanoun%2C+Mohammed+Y%2E%22">Thanoun, Mohammed Y.</searchLink><relatesTo>2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Progress+in+Electromagnetics+Research+C%22">Progress in Electromagnetics Research C</searchLink>. 2026, Vol. 168, p75-81. 7p.
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  Data: <searchLink fieldCode="DE" term="%22Blood+sugar+monitors%22">Blood sugar monitors</searchLink><br /><searchLink fieldCode="DE" term="%22Microstrip+resonators%22">Microstrip resonators</searchLink><br /><searchLink fieldCode="DE" term="%22Detectors%22">Detectors</searchLink><br /><searchLink fieldCode="DE" term="%22Microwave+remote+sensing%22">Microwave remote sensing</searchLink><br /><searchLink fieldCode="DE" term="%22Imaging+phantoms%22">Imaging phantoms</searchLink>
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  Label: Abstract
  Group: Ab
  Data: This paper presents a new compact triple-band elliptical microstrip resonator for noninvasive microwave-based glucose sensing using a thumb-contact configuration. The proposed sensor employs concentric elliptical rings with a localized slot and capacitive coupling to enhance electric-field confinement in the sensing region. A multilayer cylindrical thumb phantom incorporating dispersive tissue models and glucose-dependent blood permittivity is utilized to emulate realistic on-body conditions. Full-wave simulations in the 2-6 GHz band demonstrate three dominant glucose-sensitive resonances with monotonic frequency shifts over a concentration range of 0-600 mg/dL. The frequency deviation rates are 0.147, 0.64, and 1.037 MHz/(mg/dL), respectively, with the highest linearity reaching R² ≈ 0.98. By distributing sensing across multiple resonant modes, the proposed approach enables frequency-diverse feature extraction suitable for multivariate regression, improving robustness against contact variability and tissue heterogeneity compared to single-band configurations. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Progress in Electromagnetics Research C is the property of Electromagnetics Academy and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.2528/PIERC26012203
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      – Code: eng
        Text: English
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        PageCount: 7
        StartPage: 75
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      – SubjectFull: Blood sugar monitors
        Type: general
      – SubjectFull: Microstrip resonators
        Type: general
      – SubjectFull: Detectors
        Type: general
      – SubjectFull: Microwave remote sensing
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      – SubjectFull: Imaging phantoms
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      – TitleFull: Compact Elliptical Multi-Band Microstrip Sensor for Thumb-Tissue Glucose Sensing.
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            – D: 01
              M: 06
              Text: 2026
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              Y: 2026
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