A Novel Technology for Measurements of Dielectric Properties of Extremely Small Volumes of Liquids

Liu, Weina

doi:10.1155/2016/1436798

Cited by 6 publications

(3 citation statements)

References 18 publications

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“…The results show that the meander sensor can detect the changes of relative permittivity in order of magnitude 10 -2 and the maximum change rate of S 21 parameters can reach 1296. The change rate of S 21 parameters improves 100 times compared with the maximum in [15]. The meander sensor does improve the measuring sensitivity, and concentrate the measuring range at the same time, which is of great significance for the detection of virus properties.…”

Section: Discussionmentioning

confidence: 98%

An Ultra-Sensitivity Cancellation Type Sensor Based on Microstrip Meander-Line

Liu

Huan

Zhu

et al. 2021

2021 IEEE 3rd International Conference on Circuits and Systems (ICCS)

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The analysis of dielectric properties in Novel Coronavirus has become an important research branch since the outbreak of the epidemic in 2019. In order to detect the dielectric properties of microfluidics like virus with higher sensitivity, a radio frequency sensor model is proposed in this paper. First, based on the excellent characteristics of the microstrip meander-line such as more concentrated electric field distribution, the microstrip meander-line is introduced into the design of traditional cancellation sensor, which is called the meander sensor. Then, the relationship between transmission coefficients of the system and dielectric properties of microfluidics is given in this paper. The simulation results verify the ultrasensitivity of the meander sensor. Even though the relative permittivity of microfluidics is changed in the order of magnitude 10 -2 , the measurement results of the meander sensor also change significantly. However, the straight sensor can only measure changes of relative permittivity in the order of magnitude 10 -1 . What's more, there is a more concentrated measurement range for the meander sensor. This will be more practical for measuring weak changes of dielectric properties caused by the microfluidics itself and its interactions.

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Section: Discussionmentioning

confidence: 98%

An Ultra-Sensitivity Cancellation Type Sensor Based on Microstrip Meander-Line

Liu

Huan

Zhu

et al. 2021

2021 IEEE 3rd International Conference on Circuits and Systems (ICCS)

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“…DS sensor designs should focus on measuring such properties in small volumes of liquids or small tissue samples to propel widespread characterization of all tissue types aiding machine-learning-based diagnostics based on DS data. For example, a forward move from the material under test (MUT) to liquid under test (LUT) towards versatile biological tissue classification is necessary to propel the potential of DS-based diagnostics using AI [155].…”

Section: Ai-assisted Dielectric Spectroscopymentioning

confidence: 99%

Applications of Microwaves in Medicine Leveraging Artificial Intelligence: Future Perspectives

et al. 2023

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Microwaves are non-ionizing electromagnetic radiation with waves of electrical and magnetic energy transmitted at different frequencies. They are widely used in various industries, including the food industry, telecommunications, weather forecasting, and in the field of medicine. Microwave applications in medicine are relatively a new field of growing interest, with a significant trend in healthcare research and development. The first application of microwaves in medicine dates to the 1980s in the treatment of cancer via ablation therapy; since then, their applications have been expanded. Significant advances have been made in reconstructing microwave data for imaging and sensing applications in the field of healthcare. Artificial intelligence (AI)-enabled microwave systems can be developed to augment healthcare, including clinical decision making, guiding treatment, and increasing resource-efficient facilities. An overview of recent developments in several areas of microwave applications in medicine, namely microwave imaging, dielectric spectroscopy for tissue classification, molecular diagnostics, telemetry, biohazard waste management, diagnostic pathology, biomedical sensor design, drug delivery, ablation treatment, and radiometry, are summarized. In this contribution, we outline the current literature regarding microwave applications and trends across the medical industry and how it sets a platform for creating AI-based microwave solutions for future advancements from both clinical and technical aspects to enhance patient care.

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“…Our proposed circular SIW cavity sensor also achieved a largest frequency shift and highest sensitivity for ethanol chemical. Some highly appreciated works using GHz-THz frequency band, sensing biomaterials, petrol, propanol, and other aqueous solutions using both optical and RF sensing mechanism are mentioned here [ 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 ].…”

Section: Experimental Demonstrationmentioning

confidence: 99%

Microfluidic High-Q Circular Substrate-Integrated Waveguide (SIW) Cavity for Radio Frequency (RF) Chemical Liquid Sensing

Memon

Lim

2018

Sensors

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In this study, a high-Q circular substrate-integrated waveguide (SIW) cavity resonator is proposed as a non-contact and non-invasive radio frequency (RF) sensor for chemical sensing applications. The design of the structure utilizes SIW technology along with a circular shape to achieve a high unloaded Q factor, which is one of the important requirements for RF sensors. The resonant frequency of the proposed circular SIW cavity sensor changes when a liquid material or a chemical (microliters) is inserted in the sensitive area of the structure. The sensing of liquid materials with different permittivities is accomplished via the perturbation of the electric fields in the SIW configuration. When a microwell that is 4 mm in radius is installed vertically through the center of the bare circular SIW cavity, the operating frequency varies from 5.26 to 5.34 GHz. Similarly, when the microwell contains ethanol, the frequency shifts from 5.26 to 5.18 GHz, and the amplitude of reflection coefficient is shifted from −29 dB to −17 dB; when the microwell contains mixing deionized (DI)-water, the frequency moves from 5.26 to 4.98 GHz (which is also 0% Ethanol in our study), and the amplitude of reflection coefficient is shifted from −29 dB to −8 dB. A high unloaded Q factor is maintained throughout all experimental results. To demonstrate our idea, different concentrations of ethanol are tested and recorded. The experimental validation yields a close agreement between the simulations and the measurements.

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A Novel Technology for Measurements of Dielectric Properties of Extremely Small Volumes of Liquids

Cited by 6 publications

References 18 publications

An Ultra-Sensitivity Cancellation Type Sensor Based on Microstrip Meander-Line

An Ultra-Sensitivity Cancellation Type Sensor Based on Microstrip Meander-Line

Applications of Microwaves in Medicine Leveraging Artificial Intelligence: Future Perspectives

Microfluidic High-Q Circular Substrate-Integrated Waveguide (SIW) Cavity for Radio Frequency (RF) Chemical Liquid Sensing

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