A microstrip folded resonator sensor for measurement of dielectric constant

Seewattanapon, Somporn; Wattakeekamthorn, Thanakit; Somwong, T.; Akkaraekthalin, Prayoot

doi:10.1109/ecticon.2008.4600418

Cited by 14 publications

(8 citation statements)

References 8 publications

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“…As these are nonmagnetic, the phase velocity dependence is equivalent to a dependence on the effective dielectric constant of the medium. The resonances can be expressed by [29] (1a)…”

Section: B Experimental Methodology and Physical Phantom Preparationmentioning

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%

See 1 more Smart Citation

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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“…As these are nonmagnetic, the phase velocity dependence is equivalent to a dependence on the effective dielectric constant of the medium. The resonances can be expressed by [29] (1a)…”

Section: B Experimental Methodology and Physical Phantom Preparationmentioning

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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“…The second step of the slot ring antenna design is the reduction of its surface. The folding technique proposed by has been used to achieve it. It is an iterative process.…”

Section: Antenna Designmentioning

confidence: 99%

Folded ring slot antenna reader for UHF RFID applications using artificial magnetic conductor structure

Marques

Egels

Pannier

2016

Micro & Optical Tech Letters

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International audienceThis article presents a new design of an UHF RFID reader antenna with a circular polarization and radiation pattern in one hemisphere. This antenna consists of two parts which are a radiating element and an artificial magnetic conductor (AMC) structure. The radiating element is based on a slot ring antenna using a folding technique for rings and only one feeding source while keeping a circular polarization. The AMC structure is a simple patch structure using a size reduction technique. The possibility to mix with two different materials for substrates involves the realization of six antennas which are presented in this article. Their overall is 226 mm x 226 mm x 11.06 mm. The antenna with the best performances in the UHF-RFID-ETSI band has a gain of 6.9 dBic and an axial ratio of 3dB. (c) 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2790-2794, 201

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“…Most commonly, using these techniques, materials properties are derived from admittance measurement. The choice of the measurement technique is mostly determined by frequency range, sample size and shape, required measurement accuracy and extension of the material to be characterized [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Multilayer medium technique for nondestructive EM-properties measurement of radar absorbing materials using flanged rectangular waveguide sensor and FDTD method

Hassan

2014

2014 IEEE International Symposium on Innovations in Intelligent Systems and Applications (INISTA) Proceedings

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The mathematical truth associated with the simultaneous multiparameter measurement using reflection only sensors is that if there are n unknowns to be determined, we need at least n independent measurements to be able to solve even one of them. In this paper, multilayer medium technique is employed to produce the needed independent reflection coefficients for simultaneous nondestructive determination of complex permittivity and permeability of radar absorbing coatings at Xband of microwave frequency range. The technique is based on measuring two reflection coefficients of finite flange open-ended waveguide reflection sensor placed in close contact with the material under test backed by metal. The first reflection coefficient is measured using sample of material under test, while the second one is done to test again a combination of this sample followed by material sample with a known permittivity, permeability and thickness to form a multilayer medium sample. Finite-Difference Time-Domain (FDTD) method is applied to numerically formulate the aperture admittance and calculate reflection coefficients for the two cases. Both complex permittivity and permeability are extracted iteratively by imposing reflection coefficient value, both obtaining from FDTD modeling and measurement using Newton-Raphson method. The technique is used to measure EM-properties of radar absorbing coatings using Vector Network Analyzer. Preliminary results of ε * and μ * are in good agreement with published data. Through numerical simulations and measurement, it has demonstrated that the technique is promising for simultaneous nondestructive multiparameter (EM-properties and physical quantities) measurement of high loss materials and other applications such as thickness evaluation of layered media. The FDTD simulations and experiments results are presented.

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A microstrip folded resonator sensor for measurement of dielectric constant

Cited by 14 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

Folded ring slot antenna reader for UHF RFID applications using artificial magnetic conductor structure

Multilayer medium technique for nondestructive EM-properties measurement of radar absorbing materials using flanged rectangular waveguide sensor and FDTD method

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