Measurement System for Evaluating Dielectric Permittivity of Granular Materials in the 1.7–2.6-GHz Band

Piuzzi, Emanuele; Cannazza, Giuseppe; Cataldo, Andrea; Chicarella, Simone; Benedetto, Egidio De; Frezza, Fabrizio; Pisa, Stefano; Prontera, Santo

doi:10.1109/tim.2015.2495720

Cited by 28 publications

(21 citation statements)

References 21 publications

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“…This interval coincides with the most critical moment of the chemical reaction of hydration of cement. The relative complex permittivity values obtained with this measurement are higher (around 45% for the real part of the relative permittivity and 80% for the imaginary part) than those reported in [3], [5], [8]- [15]. Figure 9 compares the values obtained in this paper for the permittivity of concrete, with previously published results of concrete permittivity obtained through different measurement methods (Table II) either transmission/reflection based, or only reflection based.…”

Section: Measured Electromagnetic Properties Of Concretesupporting

confidence: 59%

“…The most often used transmission lines for material characterization are either coaxial structures, strip lines or waveguides [8], [13], [29]. However, the first two require small size samples, which is a drawback when it comes to measuring granular materials.…”

Section: B Design Considerationsmentioning

confidence: 99%

“…Some of the most common techniques to measure the dielectric properties of materials are studied in [6] and [7], and insights are provided regarding its applicability scenarios. In [8], a measurement set up operating on transmission/reflection regime composed by a series of waveguides is employed to measure the permittivity of granular materials. In [3], [5], [8]- [15], the dielectric properties of concrete at specific stages of the setting process are reported, but they are either reflection based or do not measure the complete setting process.…”

Section: Introductionmentioning

confidence: 99%

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Debye Frequency-Extended Waveguide Permittivity Extraction for High Complex Permittivity Materials: Concrete Setting Process Characterization

González-López

Blanch

Romeu

et al. 2020

IEEE Trans. Instrum. Meas.

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A waveguide with central frequency 868 MHz is used in transmission/reflection operation regime to accurately measure the behaviour of the complex permittivity of high complex permittivity granular materials and it has been frequencyextended up to 3 GHz using the Debye fitted relaxation model. It is shown that for highly granular high permittivity materials a waveguide based transmission/reflection technique is necessary to reduce the uncertainty of the extracted permittivity values. The technique is first described and validated with isopropyl alcohol and then applied to the characterization of cement based materials. This paper provides accurate data on the evolution of the complex permittivity of concrete and mortar from the moment of pouring until air dried condition is achieved.

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Section: Measured Electromagnetic Properties Of Concretesupporting

confidence: 59%

Section: B Design Considerationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Debye Frequency-Extended Waveguide Permittivity Extraction for High Complex Permittivity Materials: Concrete Setting Process Characterization

González-López

Blanch

Romeu

et al. 2020

IEEE Trans. Instrum. Meas.

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“…The technique proposed in Reference 7 also encounter the problem with instability shown in the extracted results (see fig. 2 in Reference 7).…”

Section: Introductionmentioning

confidence: 99%

“…The direct and de‐embed techniques proposed in Reference 6 are also not applicable for low‐loss materials at resonant frequencies, because the methods encounter the problem with instability 5 . The technique proposed in Reference 7 also encounter the problem with instability shown in the extracted results (see fig. 2 in Reference 7).…”

Section: Introductionmentioning

confidence: 99%

Determination of unique and stable complex permittivity of granular materials from transmission and reflection measurements

Yang

2020

Micro & Optical Tech Letters

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Measurement of complex permittivity of granular materials is important for varying services, such as remote sensing, telemetry, etc. In the literature, various techniques have been proposed to determine complex permittivity of granular materials sandwiched between two low‐loss spacers from transmission and reflection measurements. However, the determined results are non‐unique and resonant at some frequencies. In this article, a technique is proposed to determine unique and stable complex permittivity of granular materials. The application steps of the proposed are clearly presented. The grain and soil sandwiched between two polyvinyl chloride (PVC) spacers are measured in the X‐band to validate the proposed technique. In order to show the advantages of the proposed technique, a 140 mm X‐band waveguide blocked by two acrylonitrile butadiene styrene plastic (ABS) with thickness of 2 mm is measured.

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A Generalized Microwave Absorption Criterion of Two‐Port Networks for Electromagnetic Interference Shielding

Sun,

Qin,

Zhai

et al. 2024

Adv Elect Materials

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Herein, the Z11 argument tangent is proposed as a novel criterion for assessing energy loss (absorption) of the reciprocal two‐port networks composed of the shielding material. With a simple mathematical deduction, it can be found that the relationship between the network absorption and the Z11 argument tangent is inverted. The absorption decreases with increasing the Z11 argument tangent, and the Z11 argument is approximately equal to the power factor angle. Additionally, a series of samples are presented to verify their absorptions and the Z11 argument tangents. The numerical simulations on other works are also presented to calculate the Z11 argument tangent and validate the relationship between the Z11 argument tangent and electromagnetic absorption from another side. The experiment and simulation results agree well with that of the mathematical deduction. The findings can be applied in most passive shielding materials and provide a promising approach to guiding and developing absorption‐dominated electromagnetic shielding materials for next‐generation communication applications.

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Measurement System for Evaluating Dielectric Permittivity of Granular Materials in the 1.7–2.6-GHz Band

Cited by 28 publications

References 21 publications

Debye Frequency-Extended Waveguide Permittivity Extraction for High Complex Permittivity Materials: Concrete Setting Process Characterization

Debye Frequency-Extended Waveguide Permittivity Extraction for High Complex Permittivity Materials: Concrete Setting Process Characterization

Determination of unique and stable complex permittivity of granular materials from transmission and reflection measurements

A Generalized Microwave Absorption Criterion of Two‐Port Networks for Electromagnetic Interference Shielding

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