Estimation of microwave resonant measurements uncertainty from uncalibrated data

Torokhtii, Kostiantyn; Alimenti, Andrea; Pompeo, Nicola; Silva, Enrico

doi:10.21014/acta_imeko.v9i3.782

Cited by 10 publications

(6 citation statements)

References 19 publications

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“…A Vector Network Analyser provides the measurements of the twoport scattering coefficients of the resonator. Frequency sweeps yield the quality factors Q i and ν i (i = 1, 2) of both modes by means of complex fits of the nonideal scattering coefficients [45,46].…”

Section: The Experimentsmentioning

confidence: 99%

Pinning properties of FeSeTe thin film through multifrequency measurements of the surface impedance

Pompeo¹,

Torokhtii²,

Alimenti³

et al. 2020

Supercond. Sci. Technol.

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We present high frequency measurements of the vortex dynamics of a FeSe x Te1 − x (x = 0.5) thin film grown on a CaF2 substrate and with a critical temperature T c ≃ 18 K, performed by means of a dual frequency dielectric resonator at 16.4 GHz and 26.6 GHz. We extract and discuss various important vortex parameters related to the pinning properties of the sample, such as the characteristic frequency ν c , the pinning constant k p and the pinning barrier height U relevant for creep phenomena. We find that the vortex system is in the single-vortex regime, and that pinning attains relatively high values in terms of k p , indicating significant pinning at the high frequencies here studied. The pinning barrier energy U is quite small and exhibits a non-monotonous temperature dependence with a maximum near 12 K. This result is discussed in terms of core pinning of small portion of vortices of size ∝ ξ 3 jumping out of the pinning wells over very small distances, a process which is favoured in the high frequency, short ranged vortex oscillations here explored.

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Section: The Experimentsmentioning

confidence: 99%

Pinning properties of FeSeTe thin film through multifrequency measurements of the surface impedance

Pompeo¹,

Torokhtii²,

Alimenti³

et al. 2020

Supercond. Sci. Technol.

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“…In particular, because of the presence of noise in measurements or because of limited points of the acquired spectrum, the estimation of such quantities could be inaccurate or, in other words, the measurement uncertainty may not fit the project requirements. In the literature, there are different strategies in order to increase the accuracy of the determination of f r and Q r [ 42 , 43 , 44 ]. For instance, a Lorentzian fitting can be performed on the acquired data points so that f r , Q , and the other parameters can be derived from the fitted equation analytically and with higher accuracy [ 45 , 46 ].…”

Section: Methodsmentioning

confidence: 99%

Equivalent Circuit Model Extraction for a SAW Resonator: Below and above Room Temperature

Gugliandolo

Marinković

Crupi

et al. 2022

Sensors

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In this work, a SAW resonator is characterized in terms of admittance (Y-) parameters in the temperature range spanning from 0 °C to 100 °C, with the aim of highlighting how its physical properties are affected by the temperature change. A lumped-element equivalent-circuit model is used to represent the device under test at the considered temperature conditions and a parameters extraction process based on a Lorentzian fitting is developed for the determination of the equivalent-circuit elements in the investigated temperature range. A very good agreement is observed between the performed measurements and the model simulations. The characterization process and the subsequent equivalent-circuit parameters extraction at different temperature values are described and discussed.

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“…A better fitting approach consists in using a Lorentzian function [33], [34], which allows achieving a good estimation of the resonant parameters fR, Q, and AR. A more accurate result can be achieved by using a complex function to fit both real and imaginary parts of the spectrum [35], [36]. This technique can be useful in several applications in which the calibration procedure is impracticable (e.g., in cryogenic measurement systems) [36].…”

Section: Resonator Parameters Evaluationmentioning

confidence: 99%

“…A more accurate result can be achieved by using a complex function to fit both real and imaginary parts of the spectrum [35], [36]. This technique can be useful in several applications in which the calibration procedure is impracticable (e.g., in cryogenic measurement systems) [36]. The frequency-dependent behaviour of the magnitude of Γ of the microwave resonator was modelled as a Lorentzian function:…”

Section: Resonator Parameters Evaluationmentioning

confidence: 99%

On the design and characterisation of a microwave microstrip resonator for gas sensing applications

et al. 2021

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This study focuses on the microwave characterisation of a microstrip resonator aimed for gas sensing applications. The developed one-port microstrip resonator, consisting of three concentric rings with a central disk, is coupled to a 50-Ohm microstrip feedline through a small gap. A humidity sensing layer is deposited on this gap by drop-coating an aqueous solution of Ag@alpha-Fe2O3 nanocomposite. The operation principle of the developed humidity sensor is based on the change of the dielectric properties of the Ag@alpha-Fe2O3 nanocomposite when the relative humidity is varied. However, it should be underlined that, depending on the choice of the sensing material, different target gases of interest can be detected with the proposed structure. The frequency-dependent response of the sensor is obtained using the reflection coefficient measured from 3.5 GHz to 5.6 GHz with relative humidity ranging from 0 %rh to 83 %rh. The variation of the humidity concentration strongly impacts on the two resonances detected in the measured reflection coefficient. In particular, an increase of the humidity level leads to lowering both resonant frequencies, which can be used as sensing parameters for humidity monitoring purpose. An exponential function has been used to accurately model the two resonant frequencies as a function of the humidity.

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Estimation of microwave resonant measurements uncertainty from uncalibrated data

Cited by 10 publications

References 19 publications

Pinning properties of FeSeTe thin film through multifrequency measurements of the surface impedance

Pinning properties of FeSeTe thin film through multifrequency measurements of the surface impedance

Equivalent Circuit Model Extraction for a SAW Resonator: Below and above Room Temperature

On the design and characterisation of a microwave microstrip resonator for gas sensing applications

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