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Interdigital Capacitor-Based Passive LC Resonant Sensor for Improved Moisture Sensing

Herein, a passive low-profile moisture sensor design based on radio frequency identification (RFID) technology is proposed. The sensor consists of an LC resonant loop, and the sensing mechanism is based on the fringing electric field generated by the capacitor in the circuit. A standard planar induc...

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Autores principales: Dimitrov, Kristian Chavdarov, Song, Sanghun, Chang, Hyungjun, Lim, Taejun, Lee, Yongshik, Kwak, Byung-Jae
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7663990/
https://www.ncbi.nlm.nih.gov/pubmed/33167552
http://dx.doi.org/10.3390/s20216306
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author Dimitrov, Kristian Chavdarov
Song, Sanghun
Chang, Hyungjun
Lim, Taejun
Lee, Yongshik
Kwak, Byung-Jae
author_facet Dimitrov, Kristian Chavdarov
Song, Sanghun
Chang, Hyungjun
Lim, Taejun
Lee, Yongshik
Kwak, Byung-Jae
author_sort Dimitrov, Kristian Chavdarov
collection PubMed
description Herein, a passive low-profile moisture sensor design based on radio frequency identification (RFID) technology is proposed. The sensor consists of an LC resonant loop, and the sensing mechanism is based on the fringing electric field generated by the capacitor in the circuit. A standard planar inductor and a two-layer interdigital capacitor (IDC) with a significantly higher fringing capacitance compared to that of a conventional parallel plate capacitor (PPC) are used, resulting in improved frequency offset and sensitivity of the sensor. Furthermore, a sensor tag was designed to operate at an 8.2 MHz electronic article surveillance (EAS) frequency range and the corresponding simulation results were experimentally verified. The IDC- and PPC-based capacitor designs were comprehensively compared. The proposed IDC sensor exhibits enhanced sensitivity of 10% in terms of frequency offset that is maintained over time, increased detection distance of 5%, and more than 20% increase in the quality factor compared to sensors based on PPC. The sensor’s performance as a urine detector was experimentally qualified. Additionally, it was shown experimentally that the proposed sensor shows a faster response to moisture. Both simulation and experimental data are presented and elucidated herein.
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spelling pubmed-76639902020-11-14 Interdigital Capacitor-Based Passive LC Resonant Sensor for Improved Moisture Sensing Dimitrov, Kristian Chavdarov Song, Sanghun Chang, Hyungjun Lim, Taejun Lee, Yongshik Kwak, Byung-Jae Sensors (Basel) Letter Herein, a passive low-profile moisture sensor design based on radio frequency identification (RFID) technology is proposed. The sensor consists of an LC resonant loop, and the sensing mechanism is based on the fringing electric field generated by the capacitor in the circuit. A standard planar inductor and a two-layer interdigital capacitor (IDC) with a significantly higher fringing capacitance compared to that of a conventional parallel plate capacitor (PPC) are used, resulting in improved frequency offset and sensitivity of the sensor. Furthermore, a sensor tag was designed to operate at an 8.2 MHz electronic article surveillance (EAS) frequency range and the corresponding simulation results were experimentally verified. The IDC- and PPC-based capacitor designs were comprehensively compared. The proposed IDC sensor exhibits enhanced sensitivity of 10% in terms of frequency offset that is maintained over time, increased detection distance of 5%, and more than 20% increase in the quality factor compared to sensors based on PPC. The sensor’s performance as a urine detector was experimentally qualified. Additionally, it was shown experimentally that the proposed sensor shows a faster response to moisture. Both simulation and experimental data are presented and elucidated herein. MDPI 2020-11-05 /pmc/articles/PMC7663990/ /pubmed/33167552 http://dx.doi.org/10.3390/s20216306 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Letter
Dimitrov, Kristian Chavdarov
Song, Sanghun
Chang, Hyungjun
Lim, Taejun
Lee, Yongshik
Kwak, Byung-Jae
Interdigital Capacitor-Based Passive LC Resonant Sensor for Improved Moisture Sensing
title Interdigital Capacitor-Based Passive LC Resonant Sensor for Improved Moisture Sensing
title_full Interdigital Capacitor-Based Passive LC Resonant Sensor for Improved Moisture Sensing
title_fullStr Interdigital Capacitor-Based Passive LC Resonant Sensor for Improved Moisture Sensing
title_full_unstemmed Interdigital Capacitor-Based Passive LC Resonant Sensor for Improved Moisture Sensing
title_short Interdigital Capacitor-Based Passive LC Resonant Sensor for Improved Moisture Sensing
title_sort interdigital capacitor-based passive lc resonant sensor for improved moisture sensing
topic Letter
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7663990/
https://www.ncbi.nlm.nih.gov/pubmed/33167552
http://dx.doi.org/10.3390/s20216306
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