Measuring the microwave permittivity of single particles

Yang, Yang; He, Yunlong; Zhang, Hanqiao; Gao, Yu; Wang, Pingshan

doi:10.1109/biowireless.2013.6613664

Cited by 6 publications

(4 citation statements)

References 13 publications

(16 reference statements)

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“…9 shows the S-parameters of microwave radiation system during the 107 microwave radiation cycles. The magnitudes of S11 and S21 were less than -16dB and -23dB, which confirmed that the microwave radiation system used in this study met the design requirements and showed good sensitivity [41]- [42]. S21 fluctuated with microwave exposure time and exhibited a declining trend of 3.8 dB overall.…”

Section: Resultssupporting

confidence: 67%

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Evaluation of Non-Thermal Microwave Effects on Bovine Lens by Measuring S-Parameters Induced by Variations in Dielectric Coefficient

et al. 2021

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This study evaluated the non-thermal effects of microwave on bovine lens by measuring the Sparameters induced by the dielectric coefficient variation in bovine lens. A closed, integrated biological experiment system was designed to expose bovine lens to microwave radiation quantitatively, and Sparameters were measured. Morphological evaluations were also performed during microwave radiation to evaluate the reaction mechanism of the non-thermal effects of microwave on the bovine lens. The results showed that the bovine lens became gradually cloudy and its refractive index changed significantly with increasing doses of microwave radiation. A comparison of experimental and control bovine lenses stained with hematoxylin and eosin revealed that the change in bovine lens might be a result of the nuclear fragmentation of lens epithelial cells and disorderly arrangement of lens fiber cells, which were induced by the vibration and friction of fiber tissues upset by microwave radiation. Further, the fluctuating decrements of 3.8 dB in S21 showed that the non-thermal effects of microwave could lead to the variations in the bovine lens dielectric coefficient. These findings suggest that the dielectric coefficient may quantitatively describe the physiological state of bovine lens. This study might be the valuable reference for the establishment of new electromagnetic radiation safety standard.

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Section: Resultssupporting

confidence: 67%

“…Dielectric properties of bones had obtained significant attentions to diagnose the osteoporosis due to the correlation between the dielectric property and bone mineral density [39] [40]. Further, dielectric coefficient measurement of single particle also induced plenty of interests on the differentiation of cancer cells [41] [42].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Non-Thermal Microwave Effects on Bovine Lens by Measuring S-Parameters Induced by Variations in Dielectric Coefficient

et al. 2021

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“…A method to measure the permittivity of single particles and yeast cells at microwave frequencies is presented in [8] and [9], respectively. An electrical approach for single-cell analysis, wherein a 1.6 GHz microwave interferometer detects the capacitance changes produced by single cells flowing past a coplanar interdigitated electrode pair, is demonstrated in [10].…”

Section: Introductionmentioning

confidence: 99%

Modelling and Measurements of the Microwave Dielectric Properties of Microspheres

Abduljabar

Yang

Barrow

et al. 2015

IEEE Trans. Microwave Theory Techn.

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A microwave microstrip sensor incorporating a split ring resonator is presented in this paper for microsphere detection and dielectric characterization within a microfluidic channel. Split ring resonator (SRR) sensor of three different radii, but with approximately equal gap dimensions to change their sensitivity, were designed and fabricated, of resonance frequencies 2.5, 5.0 and 7.5 GHz. To validate the SRR sensors, two sizes of polystyrene microspheres were tested, of diameters 15 and 25 . Measurements of changes in resonance frequency and insertion loss of the odd SRR mode were related to the dielectric contrast provided by the microspheres and their host solvent, here water. COMSOL Multiphysics was used to model the sensors, and good agreements were found between the simulated and measured results.

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“…Power dividers, millimeter sized coplanar waveguides (CPW) and large (~200 μ L) polydimethylsiloxane (PDMS) wells are used therein. The technique shares the basic interference operating principle with the RF sensors [13], [14] and the microwave bridges [15], where only transmission scattering parameters are available. In this work, we show that interference-based sensors can be implemented with broadband quadrature hybrids.…”

Section: Introductionmentioning

confidence: 99%

A Quadrature-Based Tunable Radio-Frequency Sensor for the Detection and Analysis of Aqueous Solutions

Cui

Wang

2014

IEEE Microw. Wireless Compon. Lett.

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A highly tunable and sensitive radio-frequency (RF) sensor is presented for the measurement of aqueous-solution dielectric properties. Two quadrature hybrids are utilized to achieve destructive interference that eliminates the probing signals at both measurement ports. As a result, weak signals of material-under-test (MUT) are elevated for high sensitivity detections at different frequencies. The sensor is demonstrated through measuring 2-propanol-water solution permittivity at 0.01 mole fraction concentration level from ~4 GHz to ~12 GHz. De-ionized water and methanol-water solution are used to calibrate the sensor for quantitative MUT analysis through our proposed model. Micro-meter coplanar waveguides (CPW) are fabricated as RF sensing electrodes. A polydimethylsiloxane (PDMS) microfluidic channel is employed to introduce 250 nL liquid, of which ~1 nL is effectively the MUT. The permittivity and the relaxation time of 2-propanol-water solution are obtained. Compared with our power divider based sensors, the differential reflection coefficients in this work provide additional information that complements the transmission coefficient methods.

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Measuring the microwave permittivity of single particles

Cited by 6 publications

References 13 publications

Evaluation of Non-Thermal Microwave Effects on Bovine Lens by Measuring S-Parameters Induced by Variations in Dielectric Coefficient

Evaluation of Non-Thermal Microwave Effects on Bovine Lens by Measuring S-Parameters Induced by Variations in Dielectric Coefficient

Modelling and Measurements of the Microwave Dielectric Properties of Microspheres

A Quadrature-Based Tunable Radio-Frequency Sensor for the Detection and Analysis of Aqueous Solutions

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