TY - GEN
T1 - A New Microwave Oscillator-Based Microfluidic Sensor for Complex Permittivity Measurement
AU - Pai, Chu Hsuan
AU - Tseng, Chao Hsiung
N1 - Publisher Copyright:
© 2023 IEEE.
PY - 2023
Y1 - 2023
N2 - A new microwave oscillator-based microfluidic sensor is proposed in this paper for complex permittivity measurement. A modified coplanar strip resonator is proposed as the permittivity sensing device and frequency-selective element for the oscillator design. It can concentrate the sensing electric field with a distribution consistent with the microfluidic channel. As the test liquids are placed in the sensing region, the oscillation frequency and output power are measured for complex permittivity computation. The 23-µL water-ethanol mixtures with ethanol volume fractions of 10% to 70% in increments of 20% are used as the test liquids to evaluate the sensor performance. Compared with the results obtained from the commercial dielectric probe, the maximum errors of the dielectric constant and loss tangent measured by the proposed microfluidic sensor are 9.45% and -8.84%, respectively.
AB - A new microwave oscillator-based microfluidic sensor is proposed in this paper for complex permittivity measurement. A modified coplanar strip resonator is proposed as the permittivity sensing device and frequency-selective element for the oscillator design. It can concentrate the sensing electric field with a distribution consistent with the microfluidic channel. As the test liquids are placed in the sensing region, the oscillation frequency and output power are measured for complex permittivity computation. The 23-µL water-ethanol mixtures with ethanol volume fractions of 10% to 70% in increments of 20% are used as the test liquids to evaluate the sensor performance. Compared with the results obtained from the commercial dielectric probe, the maximum errors of the dielectric constant and loss tangent measured by the proposed microfluidic sensor are 9.45% and -8.84%, respectively.
KW - complex permittivity measurement
KW - liquid dielectric sensors
KW - modified coplanar strip resonator (MCSR)
KW - radio-frequency microfluidic sensors
KW - radio-frequency permittivity sensors
UR - http://www.scopus.com/inward/record.url?scp=85168548914&partnerID=8YFLogxK
U2 - 10.1109/IMS37964.2023.10188131
DO - 10.1109/IMS37964.2023.10188131
M3 - Conference contribution
AN - SCOPUS:85168548914
T3 - IEEE MTT-S International Microwave Symposium Digest
SP - 967
EP - 970
BT - 2023 IEEE/MTT-S International Microwave Symposium, IMS 2023
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2023 IEEE/MTT-S International Microwave Symposium, IMS 2023
Y2 - 11 June 2023 through 16 June 2023
ER -