Validité de la méthode de perturbation appliquée aux cavités résonnantes pour la mesure de la perméabilité et de la permittivité des petits échantillons

Boudouris, Georges

doi:10.1007/bf03022434

Cited by 15 publications

(2 citation statements)

References 25 publications

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“…Classical perturbation theory establishes that the complex permittivity of a material is deduced from the relative shift of the resonance frequency and from the variation of the inverse of the Q-factor when the sample is introduced into the resonator. The perturbation relation can be written in the form [13]…”

Section: Extended Perturbation Formulamentioning

confidence: 99%

“…This relation is valid when the sample is small so that the introduction of the sample does not modify the electromagnetic field distribution inside the resonator, and so when the relative shift of the resonance frequency is small. The Q-factor must also be much larger than unity and the imaginary part of the permittivity must be small relative to its real part [13].…”

Section: Extended Perturbation Formulamentioning

confidence: 99%

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Microwave broadband permittivity measurement with a multimode helical resonator for studying catalysts

Roussy¹,

Thiebaut

Ename-Obiang

et al. 2001

Meas. Sci. Technol.

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The authors present a resonant permittivity measurement method which works over a large microwave frequency domain, with a very small volume sample of dielectric material. The cell is a helical resonator having many modes of resonance. The shifts of resonance frequency and Q-factors are better interpreted with a bilinear function which depends on the complex permittivity of the material than by applying the classical perturbation formula. Results concerning two different catalysts which are used in the coupling oxidation methane reaction are given as a function of the temperature and the frequency to illustrate the correlation of both data sets and the differences in catalytic mechanisms.

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Section: Extended Perturbation Formulamentioning

confidence: 99%

Section: Extended Perturbation Formulamentioning

confidence: 99%

Microwave broadband permittivity measurement with a multimode helical resonator for studying catalysts

Roussy¹,

Thiebaut

Ename-Obiang

et al. 2001

Meas. Sci. Technol.

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Structural Phase Transition and Thermal Behavior of C2H5NH3Hg(CN)2Cl

Zangar

Chastanet²,

Miane³

et al. 1991

Phys. Stat. Sol. (a)

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C2H5NH3Hg(CN)2Cl belongs to the family of materials with one‐dimension structural character. X‐ray diffraction investigations, calorimetric and dielectric measurements show the occurence of a structural phase transition at Tc = 250 K from a quadratic high temperature form (P4/mmm, Z = 2) to a triclinic low temperature form (P1, Z = 2) and corresponding to a slight deformation of the unit cell when decreasing the temperature.

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