Improved hairpin resonator for microfluidic sensing

Chia Feng Liu; Ming Kun Chen; Min Haw Wang; Ling Sheng Jang

doi:10.18494/SAM.2018.1801

Improved hairpin resonator for microfluidic sensing

Chia Feng Liu, Ming Kun Chen, Min Haw Wang, Ling Sheng Jang

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

We present a near-field microwave sensor based on a hairpin resonator for detecting aqueous ethanol and aqueous NaCl concentrations in microfluidics. A hairpin sensor with a high-quality (high-Q) dielectric resonator allows the detection of a small variation in the aqueous NaCl concentration by measuring the scattering parameter (S₂₁) responses at resonance frequencies. The responses caused by the test liquids with various dielectric constants in aqueous ethanol solution were observed at operating frequencies of 1.9 and 2.1 GHz. The detection of various concentrations of NaCl in solution was also achieved. The changes in S₂₁ at resonance frequencies are directly related to changes in the aqueous NaCl concentration because of the electromagnetic interaction between the resonator and the NaCl solution. The stable linear relationships are advantageous for detecting and analyzing aqueous ethanol and aqueous NaCl concentrations. It shows that the sensor is reliable for both dielectric constant and conductivity detection in liquid. The hairpin resonator, which is easily fabricated by standard printed circuit board (PCB) technology, has great potential for microfluidic sensing applications.

Original language	English
Pages (from-to)	979-990
Number of pages	12
Journal	Sensors and Materials
Volume	30
Issue number	5
DOIs	https://doi.org/10.18494/SAM.2018.1801
Publication status	Published - 2018

All Science Journal Classification (ASJC) codes

General Materials Science
Instrumentation

Access to Document

10.18494/SAM.2018.1801

Cite this

@article{2be11126e3aa42e6a987a511336d3296,

title = "Improved hairpin resonator for microfluidic sensing",

abstract = "We present a near-field microwave sensor based on a hairpin resonator for detecting aqueous ethanol and aqueous NaCl concentrations in microfluidics. A hairpin sensor with a high-quality (high-Q) dielectric resonator allows the detection of a small variation in the aqueous NaCl concentration by measuring the scattering parameter (S21) responses at resonance frequencies. The responses caused by the test liquids with various dielectric constants in aqueous ethanol solution were observed at operating frequencies of 1.9 and 2.1 GHz. The detection of various concentrations of NaCl in solution was also achieved. The changes in S21 at resonance frequencies are directly related to changes in the aqueous NaCl concentration because of the electromagnetic interaction between the resonator and the NaCl solution. The stable linear relationships are advantageous for detecting and analyzing aqueous ethanol and aqueous NaCl concentrations. It shows that the sensor is reliable for both dielectric constant and conductivity detection in liquid. The hairpin resonator, which is easily fabricated by standard printed circuit board (PCB) technology, has great potential for microfluidic sensing applications.",

author = "Liu, {Chia Feng} and Chen, {Ming Kun} and Wang, {Min Haw} and Jang, {Ling Sheng}",

note = "Funding Information: This study was financially supported by the National Science Council of Taiwan (under grant NSC 101-2221-E-006-004-MY3). We made use of shared facilities provided under the Program of Top 100 Universities Advancement funded by the Ministry of Education in Taiwan. The authors would like to thank the Center for Micro/Nano Science and Technology at National Cheng Kung University for granting us access to major equipment throughout the duration of this study and for their general technical support. Publisher Copyright: {\textcopyright} 2018 M Y U Scientific Publishing Division. All rights reserved.",

year = "2018",

doi = "10.18494/SAM.2018.1801",

language = "English",

volume = "30",

pages = "979--990",

journal = "Sensors and Materials",

issn = "0914-4935",

publisher = "M Y U Scientific Publishing Division",

number = "5",

}

TY - JOUR

T1 - Improved hairpin resonator for microfluidic sensing

AU - Liu, Chia Feng

AU - Chen, Ming Kun

AU - Wang, Min Haw

AU - Jang, Ling Sheng

N1 - Funding Information: This study was financially supported by the National Science Council of Taiwan (under grant NSC 101-2221-E-006-004-MY3). We made use of shared facilities provided under the Program of Top 100 Universities Advancement funded by the Ministry of Education in Taiwan. The authors would like to thank the Center for Micro/Nano Science and Technology at National Cheng Kung University for granting us access to major equipment throughout the duration of this study and for their general technical support. Publisher Copyright: © 2018 M Y U Scientific Publishing Division. All rights reserved.

PY - 2018

Y1 - 2018

N2 - We present a near-field microwave sensor based on a hairpin resonator for detecting aqueous ethanol and aqueous NaCl concentrations in microfluidics. A hairpin sensor with a high-quality (high-Q) dielectric resonator allows the detection of a small variation in the aqueous NaCl concentration by measuring the scattering parameter (S21) responses at resonance frequencies. The responses caused by the test liquids with various dielectric constants in aqueous ethanol solution were observed at operating frequencies of 1.9 and 2.1 GHz. The detection of various concentrations of NaCl in solution was also achieved. The changes in S21 at resonance frequencies are directly related to changes in the aqueous NaCl concentration because of the electromagnetic interaction between the resonator and the NaCl solution. The stable linear relationships are advantageous for detecting and analyzing aqueous ethanol and aqueous NaCl concentrations. It shows that the sensor is reliable for both dielectric constant and conductivity detection in liquid. The hairpin resonator, which is easily fabricated by standard printed circuit board (PCB) technology, has great potential for microfluidic sensing applications.

AB - We present a near-field microwave sensor based on a hairpin resonator for detecting aqueous ethanol and aqueous NaCl concentrations in microfluidics. A hairpin sensor with a high-quality (high-Q) dielectric resonator allows the detection of a small variation in the aqueous NaCl concentration by measuring the scattering parameter (S21) responses at resonance frequencies. The responses caused by the test liquids with various dielectric constants in aqueous ethanol solution were observed at operating frequencies of 1.9 and 2.1 GHz. The detection of various concentrations of NaCl in solution was also achieved. The changes in S21 at resonance frequencies are directly related to changes in the aqueous NaCl concentration because of the electromagnetic interaction between the resonator and the NaCl solution. The stable linear relationships are advantageous for detecting and analyzing aqueous ethanol and aqueous NaCl concentrations. It shows that the sensor is reliable for both dielectric constant and conductivity detection in liquid. The hairpin resonator, which is easily fabricated by standard printed circuit board (PCB) technology, has great potential for microfluidic sensing applications.

UR - http://www.scopus.com/inward/record.url?scp=85047157914&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85047157914&partnerID=8YFLogxK

U2 - 10.18494/SAM.2018.1801

DO - 10.18494/SAM.2018.1801

M3 - Article

AN - SCOPUS:85047157914

SN - 0914-4935

VL - 30

SP - 979

EP - 990

JO - Sensors and Materials

JF - Sensors and Materials

IS - 5

ER -

Improved hairpin resonator for microfluidic sensing

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this