A quasi-universal method to measure the electromagnetic characteristics of usual materials in the microwave range

Georget, Élodie; Abdeddaïm, Redha; Sabouroux, Pierre

doi:10.1016/j.crhy.2014.02.003

Cited by 29 publications

(26 citation statements)

References 23 publications

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“…More details on the experimental setups and procedure of measurements are presented in Georget et al (2014).…”

Section: Measurements With a Conical Coaxial Cell Between 50 Mhz And mentioning

confidence: 99%

“…The standard deviation of a measurement on a given sample was estimated to be below 10% for . Experimental error originates from the measurement of magnitude and phase of the scattering parameters, line losses, connector mismatching, irregular sample surface, air gaps between the sample and the coaxial line, eventually by determining distances between the reference planes and the sample, and was estimated to be about or less than 10% (Georget et al 2014).…”

Section: Error Bar Estimationmentioning

confidence: 99%

“…A first step of de-embedding allows determining the sample scattering parameters, which takes into account the electrical distances, d 1 and d 2 , the thickness of the sample L (see Fig. 2), the attenuation coefficient of the coaxial line, and the wavenumber in vacuum (Georget et al 2014). Then the Nicolson-Ross procedure (see Nicolson & Ross 1970;De Paula & Barroso 2010) was applied to the sample S-matrix to determine .…”

Section: Measurements With a Conical Coaxial Cell Between 50 Mhz And mentioning

confidence: 99%

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Permittivity measurements of porous matter in support of investigations of the surface and interior of 67P/Churyumov-Gerasimenko

Brouet

Levasseur-Regourd

Sabouroux

et al. 2015

A&A

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Aims. Permittivity measurements on porous samples of volcanic origin have been performed in the 0. GHz range under laboratory conditions in support of the Rosetta mission to comet 67P/Churyumov-Gerasimenko, specifically with the MIRO radiometric experiment and CONSERT radar experiment. Methods. The samples were split into several subsamples with different size ranges covering a few µm to 500 µm. Bulk densities of the subsamples were estimated to be in the 800 to 1500 kg/m 3 range. The porosities were in the range of 48% to 65%. From 50 MHz to 6 GHz and at 190 GHz, permittivity has been determined with a coaxial cell and with a quasi-optical bench, respectively. Results. Without taking into account the volume-scattering effect at 190 GHz, the real part of the permittivity, normalized by the bulk density, is in the range of 2.1 to 2.6. The results suggest that the real part of the permittivity of an ice-free dust mantle covering the nucleus is in the 1.5−2.2 range at 190 GHz. From these values, a lower limit for the absorption length for the millimeter receiver of MIRO has been estimated to be between 0.6 and 2 cm, in agreement with results obtained from MIRO in September 2014. At frequencies of interest for CONSERT experiment, the real part of the permittivity of a suspected ice-free dust mantle should be below 2.2. It may be in the range of 1.2 to 1.7 for the nucleus, in agreement with first CONSERT results, taking into account a mean temperature of 110 K and different values for the dust-to-ice volumetric ratio. Estimations of contributions of the different parameters to the permittivity variation may indicate that the porosity is the main parameter.

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“…More details on the experimental setups and procedure of measurements are presented in Georget et al (2014).…”

Section: Measurements With a Conical Coaxial Cell Between 50 Mhz And mentioning

confidence: 99%

Section: Error Bar Estimationmentioning

confidence: 99%

Section: Measurements With a Conical Coaxial Cell Between 50 Mhz And mentioning

confidence: 99%

See 1 more Smart Citation

Permittivity measurements of porous matter in support of investigations of the surface and interior of 67P/Churyumov-Gerasimenko

Brouet

Levasseur-Regourd

Sabouroux

et al. 2015

A&A

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“…In order to linearize the discrepancies of these first results, we used a nonlinear least square method [12,13] if necessary.…”

Section: Description Of the Processingmentioning

confidence: 99%

Permittivity measurement of materials of different natures

Georget

Diaby²,

Abdeddaïm

et al. 2014

The 8th European Conference on Antennas and Propagation (EuCAP 2014)

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This A multiple configuration of segmented coaxial cell is presented to measure the electromagnetic characteristics of different states of materials. These measurements are possible thanks to a sample holder. The processing of measurement is based on a well-known method, the reflection/transmission method. In this paper, we present a result for solid, flexible material, granular material and liquid.

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“…This permittivity is retrieved using transmission/reflection method in a coaxial line [16,17]. The metallic parts are realized with 35 µm thickness copper tape.…”

Section: Antenna Designmentioning

confidence: 99%

An Open-Sleeve Folded U-Shaped Multiband Antenna

Georget¹,

Abdeddaïm²,

Garde³

et al. 2015

PIER Letters

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Abstract-In this paper, a multiband flexible antenna is presented. This antenna was realized on a flexible substrate in order to realize a deployable system for a distress beacon. We used the concept of open-sleeve antenna to change a quadrupole mode into a dipole mode. The main radiating element of the antenna is a dual-band folded U-shaped antenna. The operating frequencies of this antenna are studied depending on the length of the parasitic elements. In order to understand the matching and the radiation patterns in far field of both antennas (U-shaped and open-sleeve), their magnetic behaviors in near field are studied in simulation and in measurement. The simulated and measured radiation patterns are also presented to check the study in near field.

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A quasi-universal method to measure the electromagnetic characteristics of usual materials in the microwave range

Cited by 29 publications

References 23 publications

Permittivity measurements of porous matter in support of investigations of the surface and interior of 67P/Churyumov-Gerasimenko

Permittivity measurements of porous matter in support of investigations of the surface and interior of 67P/Churyumov-Gerasimenko

Permittivity measurement of materials of different natures

An Open-Sleeve Folded U-Shaped Multiband Antenna

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