An Ultrahigh Sensitivity Microwave Sensor for Microfluidic Applications

Fan, Li-Chao; Zhao, Wen‐Sheng; Wang, Da-Wei; Liu, Qi; Chen, Shichang; Wang, Gaofeng

doi:10.1109/lmwc.2020.3029060

Cited by 58 publications

(34 citation statements)

References 13 publications

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“…Although the sensor in Reference [49] has a smaller size than the others, it requires a relatively large amount of sample for testing. The sensors in References [50,51] offer the second and third largest average sensitivities. However, the measured notch depths in these sensors are very small (less than 1.5 dB in Reference [50] and less than 6 dB in Reference [51]).…”

Section: Comparison With Other Planar Sensorsmentioning

confidence: 99%

“…The sensors in References [50,51] offer the second and third largest average sensitivities. However, the measured notch depths in these sensors are very small (less than 1.5 dB in Reference [50] and less than 6 dB in Reference [51]). This means that such sensors are not appropriate for characterization of high loss samples.…”

Section: Comparison With Other Planar Sensorsmentioning

confidence: 99%

“…An interdigital capacitor as a capacitive gap in a split-ring resonator (SRR) is used to increase the fringing field and achieve a larger effective sensing area in Reference [49]. A similar approach was used in References [50,51] by using meandered slots in the CSRR and complementary electric-LC (CELC) resonators to achieve higher E-field concentration and better sensitivity. In Reference [52], a negative refractive index transmission line is used as a coupling structure to improve sensitivity in a SRR-based microfluidic sensor.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Extremely Sensitive Microwave Microfluidic Dielectric Sensor Using a Transmission Line Loaded with Shunt LC Resonators

Abdelwahab

Ebrahimi

Tovar-Lopez

et al. 2021

Sensors

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In this paper, a very high sensitivity microwave-based planar microfluidic sensor is presented. Sensitivity enhancement is achieved and described theoretically and experimentally by eliminating any extra parasitic capacitance not contributing to the sensing mechanism. The sensor consists of a microstrip transmission line loaded with a series connected shunt LC resonator. A microfluidic channel is attached to the area of the highest electric field concentration. The electric field distribution and, therefore, the resonance characteristics are modified by applying microfluidic dielectric samples to the sensing area. The sensor performance and working principle are described through a circuit model analysis. A device prototype is fabricated, and experimental measurements using water/ethanol and water/methanol solutions are presented for validation of the sensing mathematical model.

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Section: Comparison With Other Planar Sensorsmentioning

confidence: 99%

Section: Comparison With Other Planar Sensorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Extremely Sensitive Microwave Microfluidic Dielectric Sensor Using a Transmission Line Loaded with Shunt LC Resonators

Abdelwahab

Ebrahimi

Tovar-Lopez

et al. 2021

Sensors

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show abstract

“…where f air and f r are the resonant frequencies in air and for an MUT-loaded sensor [14]. Typically, maximizing S is regarded as a figure of merit in dielectric sensor design [16], [28]. Observing (1) and (2), it can be seen that varying Eq.…”

Section: A Parallel-plate Resonant Microstrip Sensor Designmentioning

confidence: 99%

“…However, such a model assumes the stubs are fully isolated and have no influence on each other's f n . 3D Full-wave simulation in CST Microwave Studio was used to observe the sensor's response for MUT r =1.0 and 78, representing the two ends of the possible MUTs based on recently reported sensors [28]. The first step in designing the multi-stub sensor is to identify the minimum distance required between the adjacent stubs to mitigate coupling.…”

Section: Sensor Design and Full-wave Simulationmentioning

confidence: 99%

Scalable All-Printed Microwave Microfluidic Sensor for Multi-Liquid Characterization based on a Stub-Loaded Microstrip Line

Wagih¹,

Shi²

2021

Preprint

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Microwave microfluidic sensors are typically designed with a channel in vicinity of a resonator's fringing electric (<i>E</i>)-fields, to characterize the material properties of a single fluid. This paper leverages hybrid 3D and dispenser printing to realize a scalable microfluidic sensor utilizing the parallel-plate capacitance of an open-ended microstrip stub, enabling, for the first time, a tunable sensitivity. A stub-loaded microstrip line is then proposed for characterizing multiple microfluidic samples simultaneously using a simple two-port multi-band resonator. The physical constrains which limit the scalability of the proposed sensors have been analyzed analytically and numerically, prior to implementing a three-channel triple-band sensor. The microfluidic channels have been fabricated using stereolithography 3D printing with the microstrip line directly dispenser printed on a conformable polyimide substrate. To accommodate varying channel thicknesses, a tapered microstrip line is proposed to maintain the impedance matching. The fabricated sensor is characterized using binary water-IPA mixtures to evaluate its sensitivity, comparing favorably with reported 3D-printed sensors. The proposed sensor achieves over 90% accuracy in determining the real permittivity following a simple water-based calibration across the different channels, for samples with 16 oC temperature sensitivity across all channels.

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Two-channel dual-band microwave EBG sensor for simultaneous dielectric detection of liquids

Parvathi

Gupta

2022

AEU - International Journal of Electronics and Communications

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An Ultrahigh Sensitivity Microwave Sensor for Microfluidic Applications

Cited by 58 publications

References 13 publications

Extremely Sensitive Microwave Microfluidic Dielectric Sensor Using a Transmission Line Loaded with Shunt LC Resonators

Extremely Sensitive Microwave Microfluidic Dielectric Sensor Using a Transmission Line Loaded with Shunt LC Resonators

Scalable All-Printed Microwave Microfluidic Sensor for Multi-Liquid Characterization based on a Stub-Loaded Microstrip Line

Two-channel dual-band microwave EBG sensor for simultaneous dielectric detection of liquids

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