Method for material characterization in a non-anechoic environment

Pometcu, Laura; Sharaiha, Ala; Benzerga, Ratiba; Tamas, Razvan D.; Pouliguen, Philippe

doi:10.1063/1.4947100

Cited by 12 publications

(7 citation statements)

References 17 publications

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“…Since T can be obtained from scattering parameter measu with an appropriate calibration technique [107], the complex relative permittivit determined from Equation (55). The major advantage of the free-space method is that the dielectric properties samples including textile materials can be non-destructively evaluated in the b crowave frequencies simply by placing them between the horn antennas [107] other hand, a calibration process is necessary to eliminate the effect of the feeding (e.g., connectors and antennas) in a similar rationale to the planar transmission In addition, a large sample surface is required to minimize the diffraction effec edges of the sample [109].…”

Section: Free-space Methodsmentioning

confidence: 99%

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Dielectric Properties of Textile Materials: Analytical Approximations and Experimental Measurements—A Review

Mukai

2022

Textiles

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Deciphering how the dielectric properties of textile materials are orchestrated by their internal components has far-reaching implications. For the development of textile-based electronics, which have gained ever-increasing attention for their uniquely combined features of electronics and traditional fabrics, both performance and form factor are critically dependent on the dielectric properties. The knowledge of the dielectric properties of textile materials is thus crucial in successful design and operation of textile-based electronics. While the dielectric properties of textile materials could be estimated to some extent from the compositional profiles, recent studies have identified various additional factors that have also substantial influence. From the viewpoint of materials characterization, such dependence of the dielectric properties of textile materials have given rise to a new possibility—information on various internal components could be, upon successful correlation, extracted by measuring the dielectric properties. In view of these considerable implications, this invited review paper summarizes various fundamental theories and principles related to the dielectric properties of textile materials. In order to provide an imperative basis for uncovering various factors that intricately influence the dielectric properties of textile materials, the foundations of the dielectrics and polarization mechanisms are first recapitulated, followed by an overview on the concept of homogenization and the dielectric mixture theory. The principal advantages, challenges and opportunities in the analytical approximations of the dielectric properties of textile materials are then discussed based on the findings from the recent literature, and finally a variety of characterization methods suitable for measuring the dielectric properties of textile materials are described. It is among the objectives of this paper to build a practical signpost for scientists and engineers in this rapidly evolving, cross-disciplinary field.

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Section: Free-space Methodsmentioning

confidence: 99%

“…On the other hand, a calibration process is necessary to eliminate the effect of the feeding systems (e.g., connectors and antennas) in a similar rationale to the planar transmission method. In addition, a large sample surface is required to minimize the diffraction effects at the edges of the sample [109].…”

Section: Conflicts Of Interestmentioning

confidence: 99%

Dielectric Properties of Textile Materials: Analytical Approximations and Experimental Measurements—A Review

Mukai

2022

Textiles

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“…Inside these two groups are found six main techniques [18]- [20] according to the application domain and the state or kind of material to be characterized [21]. These six methods are Free-space [9], [22], [23], resonant cavity [24]- [26], capacitive or parallel plates capacitor [27], inductance [11], [28], probes [29], [30], and transmission line [31]- [33].…”

Section: Introductionmentioning

confidence: 99%

Material Relative Permittivity Determination From the Inhomogeneous Transmission-Line Secondary Parameters

2022

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After further transmission line technique investigation, we propose a new approach to material characterization based on the combination of the propagation constant and the characteristic impedance of the transmission-line. Three main elements constitute the approach novelty's root: the determination of the propagation constant without using the eigenvalue principle, the improved mathematical expression of the characteristic impedance, and the automatically corrected coefficient. The two-line technique is based on three required measures, where the most extended fixture is partially filled with the specimen to be tested. As a result, the discontinuities caused by the geometric change of access interfaces and the waveguide dimensions have been solved. The characteristic impedance is determined straight and amended by a third polynomial function degree. The polynomial function and the amended correction coefficient determination are the facilitation parameters of the new approach technique. This new method allows the extraction of the material's complex relative permittivity. The procedure has been validated with the Rogers RO4003C, Alumina 99.6%, and Vinifera (based on the dielectric materials available in our laboratory) through the microstrip fixture in the scanned frequency (0.08 -8) GHz by extracting its electric intrinsic parameters. The dielectric constants range from 1.1-10.4, where the thicknesses are 1.54 mm, 2.067 mm, and 1.078 mm have been used. Two identical microstrip test cells with the same geometric dimensions but various lengths have been manufactured. That promotes the feasibility of two measures simultaneously.

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“…From microwave theory, material characterization methods can be categorized into two forms: non-resonant [6] and resonant processes [7], which can also be subdivided into two techniques, namely through one port technique [8] and two ports technique [9][10][11]. Among several existing methods [12,13], the probe or applicator method is well known [14][15][16]. It is either used for magnetic [17] or dielectric [18] materials.…”

Section: Introductionmentioning

confidence: 99%

Dual Coaxial Probes in Transmission Inserted by Dielectric With Two Different Thicknesses to Extract the Material Complex Relative Permittivity: Discontinuity Impacts

Mbango¹,

Ndagijimana²,

Okana³

2021

PIER C

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After a thorough investigation, this paper introduces a novel and simple radiofrequency material characterization technique. For this study's purposes, two probes were developed and separated by the sample under test (SUT) with an inhomogeneous test cell. Furthermore, the discontinuity impacts at the probe, SUT interfaces, were also studied. The investigation uses the transmission process through the principle of two different SUT thicknesses to measure its relative permittivity and loss tangent. The technique is based on using the lumped elements of an equivalent circuit of the entire test cell and covers 1 MHz-2 GHz. With the SUT, placed between two metal probes and another metallization, placed under its thickness on an opposite side to improve the loss tangent acquisition level, the cascading chain matrix (CCM) is used to get the final parameters. The thickness changing makes it possible to overcome the contact interface effects probe-sample. A mathematical model has also been presented through the fitting procedure. The new technique has been validated with three materials: Rogers RO4003C, FR-4 HTG-175, and Alumina 99.6%. The SUT complex relative permittivity extraction makes the new approach suitable for the telecommunication industry and many others. The method is also ideal for materials with thickness sizing up to 3 mm around.

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Method for material characterization in a non-anechoic environment

Cited by 12 publications

References 17 publications

Dielectric Properties of Textile Materials: Analytical Approximations and Experimental Measurements—A Review

Dielectric Properties of Textile Materials: Analytical Approximations and Experimental Measurements—A Review

Material Relative Permittivity Determination From the Inhomogeneous Transmission-Line Secondary Parameters

Dual Coaxial Probes in Transmission Inserted by Dielectric With Two Different Thicknesses to Extract the Material Complex Relative Permittivity: Discontinuity Impacts

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