Simplified approach to detect dielectric constant using a low-cost microfluidic quarter mode substrate-integrated waveguideopen access
- Authors
- Salim, A.; Memon, M.U.; Jeong, H.; Lim, Sungjoon
- Issue Date
- Sep-2020
- Publisher
- MDPI AG
- Keywords
- Calibration; Chemical sensor; Dielectric constant detection; RF sensor; Substrate-integrated waveguide
- Citation
- Sensors (Switzerland), v.20, no.17, pp 1 - 15
- Pages
- 15
- Journal Title
- Sensors (Switzerland)
- Volume
- 20
- Number
- 17
- Start Page
- 1
- End Page
- 15
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/44071
- DOI
- 10.3390/s20174985
- ISSN
- 1424-8220
1424-3210
- Abstract
- Liquid materials’ characterization using commercial probes and radio frequency techniques is expensive and complex. This study proposes a compact and cost-effective radio frequency sensor system to measure the dielectric constant using a three-material calibration. The simplified approach measures reflection coefficient magnitudes for all four materials rather than the complex values in conventional permittivity detection systems. We employ a sensor module based on a circular substrate-integrated waveguide with measured unloaded quality factor = 910 to ensure measurement reliability. Miniaturized quarter-mode substrate-integrated waveguide resonators are integrated with four microfluidic channels containing three known materials and one unknown analyte. Step-wise measurement and linearity ensures maximum 4% error for the dielectric constant compared with results obtained using a high-performance commercial product. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.
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Collections - College of ICT Engineering > School of Electrical and Electronics Engineering > 1. Journal Articles
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