A dual microstrip resonator for liquid dielectric constant measurement

Seewattanapon, Somporn; Akkaraekthalin, Prayoot

doi:10.1109/apmc.2008.4958682

Cited by 4 publications

(5 citation statements)

References 8 publications

(8 reference statements)

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“…The plastic bags introduced an air-gap between the resonator and the phantom; thus, the repeatability of the measurement results was low. The resonator fabricated on the Taconic TLC (30) substrate, reported in [31], was tested with semisolid phantoms to investigate the repeatability of the measurements; the experimental setup is shown in Fig. 3.…”

Section: A Design Of the Spiral Resonatormentioning

confidence: 99%

“…Although microstrip resonators are mainly utilized to retrieve the dielectric properties of low-loss and low-permittivity materials in the literature (e.g., [29] and [30]), such resonators can also be utilized for dielectric property retrieval of biological tissues. The dielectric properties of biological tissues are mainly investigated with open-ended coaxial probes.…”

Section: Introductionmentioning

confidence: 99%

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Towards Accurate Dielectric Property Retrieval of Biological Tissues for Blood Glucose Monitoring

Yilmaz

Foster

Hao

2014

IEEE Trans. Microwave Theory Techn.

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An analytical formulation for relative dielectric constant retrieval is reconstructed to establish a relationship between the response of a spiral microstrip resonator and effective relative dielectric constant of a lossy superstrate, such as biological tissue. To do so, an analytical equation is modified by constructing functions for the two unknowns, the filling factor and effective length of the resonator. This is done by simulating the resonator with digital phantoms of varying permittivity. The values of and are determined for each phantom from the resulting S-parameter response, using particle swarm optimization. Multiple nonlinear regression is applied to produce equations for and , expressed as a function of frequency and the phantom's relative dielectric constant. These equations are combined to form a new nonlinear analytical equation, which is then solved using the Newton-Raphson iterative method, for both simulations and measurements of physical phantoms. To verify the reconstructed dielectric constant, the dielectric properties of the physical phantoms are determined with commercial high temperature open-ended coaxial probe. The dielectric properties are reconstructed by the described method, with less than 3.67% error with respect to the measurements.Index Terms-Dielectric property retrieval, high-loss materials, high-permittivity materials, non-invasive glucose monitoring, spiral resonator. 0018-9480

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Section: A Design Of the Spiral Resonatormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Towards Accurate Dielectric Property Retrieval of Biological Tissues for Blood Glucose Monitoring

Yilmaz

Foster

Hao

2014

IEEE Trans. Microwave Theory Techn.

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“…It is essential to accurately test the permittivity and loss tangent of low-loss dielectric materials to meet the application requirements of various fields. Generally, the permittivity and loss tangent of low-loss dielectric materials are mainly measured by the resonant cavity method, including microstrip resonant cavities [ 12 , 13 , 14 ], rectangular resonant cavities [ 15 , 16 , 17 , 18 ], cylindrical resonant cavities [ 19 , 20 , 21 ], and re-entrant cavity resonators [ 22 ]. For example, Federico Gabriele et al [ 23 ] provided relative permittivity measurements for emerging 5G and beyond applications operating at high frequencies based on resonant cavities with the substrate-integrated waveguide technique.…”

Section: Introductionmentioning

confidence: 99%

A Novel Strategy for Detecting Permittivity and Loss Tangent of Low-Loss Materials Based on Cylindrical Resonant Cavity

Zhou

Chen

et al. 2023

Sensors

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Accurate measurement of the permittivity and loss tangent of low-loss materials is essential due to their special applications in the field of ultra large scale integrated circuits and microwave devices. In this study, we developed a novel strategy that can accurately detect the permittivity and loss tangent of low-loss materials based on a cylindrical resonant cavity supporting the TE111 mode in X band (8–12 GHz). Based on an electromagnetic field simulation calculation of the cylindrical resonator, permittivity is precisely retrieved by exploring and analyzing the perturbation of the coupling hole and sample size on the cutoff wavenumber. A more precise approach to measuring the loss tangent of samples with various thicknesses has been proposed. The test results of the standard samples verify that this method can accurately measure the dielectric properties of samples that have smaller sizes than the high Q cylindrical cavity method.

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“…Research on methods based on resonance [29][30][31][32][33][34] concentrates on how to distribute the electric field throughout the entire container by means of shape design. Although a beneficial design of the container shape affects the electric field distribution and the accuracy of moisture measurement, this results in a lack of flexibility of the container shape and size.…”

Section: Introductionmentioning

confidence: 99%

A Design Method for a Microwave-Based Moisture Sensing System for Granular Materials in Arbitrarily Shaped Containers

2021

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To estimate the moisture in an entire arbitrarily shaped workpiece, an automatic system should continuously sense moisture at all points of the workpiece. This paper proposes a design method for a microwavebased moisture sensing system for granular materials in arbitrarily shaped containers based on scanning in a moisture sensing box. The size of the moisture sensing box is first determined as the maximum size of any granular material containers based on initial user requirements. The moisture sensing system physically consists of a pair of antennas for microwave transmission and reception and a pair of distance sensors scanning throughout the maximum scanning range of the moisture sensing box to find the attenuation and workpiece thickness at all points of the workpiece, and these sensed microwave attenuations and workpiece thickness measurements are then used to calculate the moisture at all points of the workpiece. The average moisture of all points is finally taken as the estimated moisture of the whole workpiece.To evaluate the performance of the proposed system, experiments have been performed with granular materials in containers of various shapes, and the estimation results show the proposed method of continuous moisture scanning of a workpiece can improve 7.77% approximately compared with the antenna array approach.

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A dual microstrip resonator for liquid dielectric constant measurement

Cited by 4 publications

References 8 publications

Towards Accurate Dielectric Property Retrieval of Biological Tissues for Blood Glucose Monitoring

Towards Accurate Dielectric Property Retrieval of Biological Tissues for Blood Glucose Monitoring

A Novel Strategy for Detecting Permittivity and Loss Tangent of Low-Loss Materials Based on Cylindrical Resonant Cavity

A Design Method for a Microwave-Based Moisture Sensing System for Granular Materials in Arbitrarily Shaped Containers

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