Microwave microlitre lab-on-substrate liquid characterisation based on SIW slot antenna

Silavwe, Evans; Somjit, Nutapong; Robertson, I.D.

doi:10.1109/eumc.2016.7824328

Cited by 3 publications

(4 citation statements)

References 9 publications

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“…It is worth noticing that the frequency response of the sensor showed a high sensitivity to different liquids. By introducing deionized water into the microchannel,

decreased from 134.20 to 75.45 MHz, and

was approximately 44%, which is much higher than that of the previously reported work using microwave ring resonators [ 32 , 33 ], T-resonators, and T-resonators integrated with radio frequency identification (RFID) chips to achieve wireless fluid sensing [ 34 ], and substrate integrated resonators [ 35 , 36 , 37 ]. Moreover, the sensitivity was much higher in low permittivity regions than in high permittivity regions since the slope of the curve in Figure 4 b represents sensitivity of

to the permittivity of fluids.…”

Section: Resultsmentioning

confidence: 82%

An LC Wireless Microfluidic Sensor Based on Low Temperature Co-Fired Ceramic (LTCC) Technology

Liang

Zhang

et al. 2019

Sensors

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This work reports a novel wireless microfluidic biosensor based on low temperature co-fired ceramic (LTCC) technology. The wireless biosensor consists of a planar spiral inductor and parallel plate capacitor (LC) resonant antenna, which integrates with microchannel bends in the LTCC substrate. The wireless response of the biosensor was associated to the changes of its resonant frequency due to the alteration in the permittivity of the liquid flow in the microchannel. The wireless sensing performance to different organic liquids with permittivity from 3 to 78.5 was presented. The measured results are in good agreement with the theoretical calculation. The wireless detection for the concentration of glucose in water solution was investigated, and an excellent linear response and repeatability were obtained. This kind of LC wireless microfluidic sensor is very promising in establishing wireless lab-on-a-chip for biomedical and chemical applications.

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“…It is worth noticing that the frequency response of the sensor showed a high sensitivity to different liquids. By introducing deionized water into the microchannel,

decreased from 134.20 to 75.45 MHz, and

to the permittivity of fluids.…”

Section: Resultsmentioning

confidence: 82%

An LC Wireless Microfluidic Sensor Based on Low Temperature Co-Fired Ceramic (LTCC) Technology

Liang

Zhang

et al. 2019

Sensors

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“…The free space method is also wide range operation, contactless, non-destructive, and useful for challenging conditions like very high temperature and pressure. But the method is particularly useful for solid samples only, needs a very focused beam and the beam should suffer minimum diffraction from the SUT [9]. The open-ended coaxial probe method is particularly useful for liquid samples and provides highly accurate measurements [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…Among the resonance methods, the drawback of the resonator cavity method is that its accuracy is compromised for high-loss SUTs, but the dielectric resonator method is useful for both the low-loss and high-loss SUTs [9]. Microwave planar resonator sensors working on the principle of dielectric resonator method, have been widely used due to their inexpensiveness, compact form, and straightforward design with relative ease of fabrication.…”

Section: Introductionmentioning

confidence: 99%

Highly sensitive DS-CSRR based microwave sensor for permittivity measurement of liquids

Buragohain,

Das,

Beria

et al. 2023

Meas. Sci. Technol.

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In this work, a low-cost Double Split Complementary Split Ring Resonator (DS-CSRR) microwave sensor has been designed and fabricated on an FR4 substrate for permittivity characterization of liquids. This modified CSRR structure is proposed to make use of the benefits of the dielectric resonator technique compared to other types of microwave methods. The resonator structure comprises two slits in each of the rings normal to each other while maintaining one slit in each ring along the feed line for maximum excitation of the resonator. The resonator with substrate dimensions of 20mm×30mm acts like an LCR circuit and operates at 2.501 GHz of the Industrial Scientific and Medical (ISM) band. Eleven different liquid samples (each with 150 μL of volume) covering a wide permittivity range of 1-111 have been used to measure the transmission coefficient (S_21) using Vector Network Analyzer (VNA). In comparison with many recently reported works, the sensitivity of the sensor is found to be higher with average and normalized sensitivity of 35.07 MHz/unit permittivity and 1.4 % respectively. Fit equations are developed for both real and imaginary parts of permittivity, and using the fit equations the permittivity of three unknown samples are determined with less than 3.7 % error. The sensor adopts a unique orientation of the slits to enhance the E-field intensity for better interaction of the samples with the sensor. A compact form factor, low production cost, future integration possibilities, and high sensitivity are the distinct highlights of the sensor. The sensor promises to be a potential candidate for situations that demands low-cost and highly accurate measurements and may be a good alternative to commercial sensors for dielectric characterization, concentration analysis, and impurity measurement of liquids.

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“…dielectric constants. In [11], the authors presented the basic sensor structure with preliminary measurement results. In this paper, intensive design study, in-depth measurement results and performance comparisons as well as mathematical modeling are introduced for the first time.…”

Section: Introductionmentioning

confidence: 99%

A Microfluidic-Integrated SIW Lab-on-Substrate Sensor for Microliter Liquid Characterization

2016

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Abstract-A novel microfluidic-integrated microwave sensor with potential application in microliter-volume biological/biomedical liquid sample characterization and quantification is presented in this paper. The sensor is designed based on the resonance method, providing the best sensing accuracy, and implemented by using a substrate-integratedwaveguide (SIW) structure combining with a rectangular slot antenna operating at 10 GHz. The device can perform accurate characterization of various liquid materials from very low to high loss, demonstrated by measurement of deionized (DI) water and methanol liquid mixtures. The measured relative permittivity, which is the real part of complex permittivity, ranges from 8.58 to 66.12, which is simply limited by the choice of test materials available in our laboratory, not any other technical considerations of the sensor. The fabricated sensor prototype requires a very small liquid volume of less than 7 µl, while still offering an overall accuracy of better than 3 %, as compared to the commercial and other published works. Key advantages of the proposed sensor are that it combines 1.) a very low-profile planar and miniaturized structure sensing microliter liquid volume; 2.) ease of design and fabrication, which makes it cost-effective to manufacture and 3.) noninvasive and contactless measurements. Moreover, since the microfluidic subsystem can potentially be detached from the SIW microwave sensor and, afterward, replaced by a new microfluidic component, the sensor can be reused with no life-cycle limitation and without degrading any figure of merit.

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Microwave microlitre lab-on-substrate liquid characterisation based on SIW slot antenna

Cited by 3 publications

References 9 publications

An LC Wireless Microfluidic Sensor Based on Low Temperature Co-Fired Ceramic (LTCC) Technology

An LC Wireless Microfluidic Sensor Based on Low Temperature Co-Fired Ceramic (LTCC) Technology

Highly sensitive DS-CSRR based microwave sensor for permittivity measurement of liquids

A Microfluidic-Integrated SIW Lab-on-Substrate Sensor for Microliter Liquid Characterization

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