Dielectric measurements using a coaxial resonator opened to a waveguide below cut-off

Galwas, B.A.; Piotrowski, J.; Skulski, J.

doi:10.1109/19.571898

Cited by 18 publications

(11 citation statements)

References 3 publications

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“…The fullwave analysis of the structure via a mode-matching formulation has been employed in order to calculate the normalized admittance at the TJ plane without any restrictions. The method for a coaxial line terminated by a circular waveguide of radius equal to the coax outer conductor has been described in [6]. Only the key steps are given here in order to avoid repetition of [6].…”

Section: B Coaxial Line -Circular Waveguide Junctionmentioning

confidence: 99%

“…The method for a coaxial line terminated by a circular waveguide of radius equal to the coax outer conductor has been described in [6]. Only the key steps are given here in order to avoid repetition of [6].…”

Section: B Coaxial Line -Circular Waveguide Junctionmentioning

confidence: 99%

“…Dielectric measurements using a coaxial resonator opened to a circular waveguide have been proposed in [6]. Placing of a dielectric layer in the circular waveguide, which air-filled section above the material is below cut-off eliminates any parasitic radiation.…”

Section: Introductionmentioning

confidence: 99%

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Broad-Band Dielectric Probe with a Coaxial Line - Circular Waveguide Junction

Piotrowski

Chramiec

2000

30th European Microwave Conference, 2000

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A model of a broad-band dielectric probe for permittivity measurements of liquids and powdered materials at microwave frequencies is presented in the paper. The coaxial line -circular waveguide junction, built in the probe, is studied using full-wave analysis. A layer of material under test is placed in the circular waveguide of arbitrary radius The probe has been modeled in order to predict the relationship between reflection coefficient at the input and the complex permittivity of any dielectric sample. The developed model was verified with measurements on air, methanol and distilled water.

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Section: B Coaxial Line -Circular Waveguide Junctionmentioning

confidence: 99%

Section: B Coaxial Line -Circular Waveguide Junctionmentioning

confidence: 99%

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Broad-Band Dielectric Probe with a Coaxial Line - Circular Waveguide Junction

Piotrowski

Chramiec

2000

30th European Microwave Conference, 2000

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“…the pH of the bulk solution and the buffer capacity; • a microwave dielectrometer for measuring dielectric permeability of solid materials, described in [15], whose output data, representative of the resonance curve, depend on two influence quantities, viz. the density and temperature of the sample.…”

Section: Examples Of Quasi-dynamic Reconstruction Problemsmentioning

confidence: 99%

On teaching measurement applications of digital signal processing

Morawski

2007

Measurement

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“…Several complex permittivity measurement methods are presented in literature, which include free space methods and transmission line techniques (13), cavity resonators and open-ended coaxial-probe techniques (14), resonators techniques (15), while the electrical conductivity values of saline solutions in the RF band are not clearly reported and often the presented values contradict each other.…”

Section: Introductionmentioning

confidence: 97%

An efficient method for electrical conductivity measurement in the RF range

Giovannetti

Frijia

Menichetti

et al. 2010

Concepts Magn Reson

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Many of the hardware procedure like radiofrequency (RF) coils testing and simulation experiments such as the estimation of temperature changes in magnetic resonance imaging experiments require saline phantoms. These kinds of experimental models are generally obtained using a well-defined container filled with conductive salt solution (i.e., diluted NaCl solution) or using a combination of conductive gel with a semi-solid consistency. These phantoms are commonly prepared according to the standards values of the principal parameter concerning theirs dielectric properties (i.e., permittivity and electrical conductivity). Although several permittivity measurement methods have already been reported in literature, most of the data describing the electrical conductivity of these saline solutions provided by different authors are often conflicting and the frequencies of each measure are not always specified. Besides, low-cost commercial conductimeters could provide measurements overlooking the conductivity dependence on the frequency, while the measurements in the RF range require costly coaxial probes which work with network analyzers with multi-electrodes working in solution. In this article, we describe a system based on self-made coil designed to measure the electrical conductivity of conductive solutions in the RF range, without any contact between the sample and the measurement probe. The estimated value of conductivity has been performed combining theoretical calculation of induced resistance in the phantom volume and experimental measurements using workbench instrumentations. The method can be applied to the whole RF range measurements by tuning the capacitor value of the resonant circuit.

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Dielectric measurements using a coaxial resonator opened to a waveguide below cut-off

Cited by 18 publications

References 3 publications

Broad-Band Dielectric Probe with a Coaxial Line - Circular Waveguide Junction

Broad-Band Dielectric Probe with a Coaxial Line - Circular Waveguide Junction

On teaching measurement applications of digital signal processing

An efficient method for electrical conductivity measurement in the RF range

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