Wireless Sensing of Complex Dielectric Permittivity of Liquids Based on the RFID

Lobato‐Morales, Humberto; Corona‐Chávez, Alonso; Olvera‐Cervantes, José‐Luis; Chávez‐Pérez, Ricardo A.; Medina-Monroy, José Luis

doi:10.1109/tmtt.2014.2333711

Cited by 76 publications

(24 citation statements)

References 16 publications

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“…It is because the polymer modifies the effective permittivity of the system, and it can even induce displacements in resonance frequencies. This physical principle is used in other applications such as [21,39]. Figure 7 shows the reflection coefficient by four manufactured samples.…”

Section: Resultsmentioning

confidence: 99%

Development of an Improved Response Ultra-Wideband Antenna Based on Conductive Adhesive of Carbon Composite

Reyes-Vera¹,

Arias-Correa²,

Giraldo-Muno³

et al. 2017

PIER C

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Abstract-Ultra-wideband (UWB) antennas have advantages such as high data rates, improved multipath resistance and low power consumption. In this work, UWB patch antennas based on electrically conductive adhesive were manufactured with a simple technique and evaluated in the laboratory. Results showed that the thickness of the samples ranged from 207 to 261 µm. The bandwidth optimization obtained was 200% compared to a traditional copper-layer antenna. UWB antennas showed an average bandwidth of 8.558 GHz in the region 609 MHz to 9.105 GHz. The antennas covered the whole of UHF band, L band, S band, C band and part of X band. Finally, the proposed technique allows reducing the size of patch by 70% for low frequencies of operation, while achieving a similar performance.

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Section: Resultsmentioning

confidence: 99%

Development of an Improved Response Ultra-Wideband Antenna Based on Conductive Adhesive of Carbon Composite

Reyes-Vera¹,

Arias-Correa²,

Giraldo-Muno³

et al. 2017

PIER C

View full text Add to dashboard Cite

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“…The resonance frequency and Q are affected by the permittivity of the MUT. Then, the permittivity of the MUT can be obtained by measuring the resonant frequency shift and the Q variation of the cavity according to the following relationships [22,23]:…”

Section: Theoretical Analysismentioning

confidence: 99%

Design of Substrate-Integrated Waveguide Loading Multiple Complementary Open Resonant Rings (CSRRs) for Dielectric Constant Measurement

Hao

Wang

2020

Sensors

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In order to solve the low-sensitivity problem of the dielectric constant with the resonant cavity method, a sensor based on a substrate-integrated waveguide structure loaded with a multi-complementary open resonant ring is proposed. With the enhanced resonance characteristics of the sensor, this design realized the measurement of complex dielectric constants in a wide range. The frequency selectivity of the sensor is improved by the high-quality factor of the substrate-integrated waveguide. By loading three complementary resonant rings with different opening directions in the ground plane, a deeper notch and better out-of-band suppression are achieved. The effect of the complex dielectric constant on both resonant frequency and quality factor is discussed by calculating the material under test with a known dielectric constant. Simulation and experimental results show that a resonance frequency offset of 102 MHz for the per unit dielectric constant is achieved. A wide frequency offset is the prerequisite for accurate measurement. The measurement results of four plates match well with the standard values, with a relative error of the real part of the dielectric constant of less than 2% and an error of less than 0.0099 for the imaginary part.

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“…ESONANCE methods are the most accurate in liquid material detection and quantification compared to the other available alternatives such as transmission-line techniques [1]- [5]. The resonance methods are normally used to characterize materials at either a single frequency or a narrow band.…”

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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Wireless Sensing of Complex Dielectric Permittivity of Liquids Based on the RFID

Cited by 76 publications

References 16 publications

Development of an Improved Response Ultra-Wideband Antenna Based on Conductive Adhesive of Carbon Composite

Development of an Improved Response Ultra-Wideband Antenna Based on Conductive Adhesive of Carbon Composite

Design of Substrate-Integrated Waveguide Loading Multiple Complementary Open Resonant Rings (CSRRs) for Dielectric Constant Measurement

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

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