Document Type
Article
Publication Date
7-1-2026
Department
Department of Electrical and Computer Engineering
Abstract
In this study, a low-profile and saw-tooth-shaped slot antenna sensor is proposed for liquid characterization, demonstrating sensitivity to dielectric variations in glucose, saline, and alcohol-based solutions. The antenna consists of a single-layer Rogers 4003C substrate with a rectangular slot integrated with multiple saw-tooth perturbations on the top side and a modified microstrip feedline with a quarter-wavelength transformer on the bottom side. The saw-tooth geometry enhances electric field concentration within the slot region, thereby improving sensitivity to variations in dielectric properties. When liquids with different dielectric constants are deposited on the saw-tooth region of the antenna, measurable resonance frequency shifts occur, enabling material detection. The sensor demonstrated sensitivity in detecting methanol, ethanol, isopropyl alcohol, saline, and glucose solutions. This configuration with dimensions 48 × 48 × 0.508 mm3 (0.78 λo × 0.78 λo × 0.0083 λo at 4.9 GHz, λo represents the free-space wavelength evaluated at the center frequency of the antenna's impedance bandwidth) feasibility for chemical characterization and biomedical sensing applications using an antenna structure.
Publication Title
Journal of Applied Physics
Recommended Citation
Cho, H.,
&
Choi, J.
(2026).
Saw-tooth slot antenna sensor for dielectric characterization of alcohols, saline solutions, and glucose.
Journal of Applied Physics,
140(1).
http://doi.org/10.1063/5.0320218
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p2/2818
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.
Version
Publisher's PDF
Publisher's Statement
© 2026 Author(s). Publisher’s version of record: https://doi.org/10.1063/5.0320218