A microwave method based on amplitude-only reflection measurements for permittivity determination of low-loss materials

Hasar, Uğur Cem; Yurtcan, Mustafa Tolga

doi:10.1016/j.measurement.2010.07.002

Cited by 31 publications

(18 citation statements)

References 59 publications

(97 reference statements)

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“…Other approach is described in [18], using only the amplitude of the reflection coefficient. Two distant frequencies (in non-dispersive media) or three near frequencies (in dispersive media) can be used.…”

Section: Single-port Reflection Methodsmentioning

confidence: 99%

Non-resonant Permittivity Measurement Methods

Severo¹,

Salles

Nervis

et al. 2017

J. Microw. Optoelectron. Electromagn. Appl.

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Abstract- [7]. The purpose of this work is to generate explicit equations for the permittivity using a straightforward scattering parameters model for load-terminated samples. II. PERMITTIVITY MEASUREMENT METHODS A. Historical DevelopmentIn 1946, Roberts and Von Hippel [8] presented a method for the measurement of permittivity using an air-filled rectangular waveguide with a sample of MUT in the end of the waveguide. By

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Section: Single-port Reflection Methodsmentioning

confidence: 99%

Non-resonant Permittivity Measurement Methods

Severo¹,

Salles

Nervis

et al. 2017

J. Microw. Optoelectron. Electromagn. Appl.

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“…In (9), the index n + 1 represents the last interface (salt-air) and A n+1 represents the transmission coefficient in the air of the borehole of the receiving antenna (assumed to be equal to 1 since the transversal dimension of the hole is 7.5 cm). The quantity is…”

Section: A Radio Wave Propagation Model For a Heterogeneous Layered mentioning

confidence: 99%

“…The measured quantities S 11 and S 21 [corresponding to (8) and (9)] contain information about all constituent layers in between the emission and reception antennas. Theoretically speaking, a Levenberg-Marquardt fitting algorithm could match the complex permittivity of each layer together with its thickness.…”

Section: A Characterization Of Sedimentary Saltmentioning

confidence: 99%

“…with thicknesses varying from 0.0045 to 0.278 m. The number of layers increases to 153 for 50 m of propagation, and to 296 after 100 m (layers with a thickness of almost 1 m are also present). The results of the fitting algorithm of (9) are limited by the sensitivity of the used VNA in the sense that measurements performed with higher precision instrumentation would lead to a larger number of fully determined layers [more terms would be relevant in (9)]. Note that the other methods, such as 2-D electrical resistivity tomography, allow media characterization with a resolution of 0.25-0.5 m and are also limited to highly irregular or complex geological features [47].…”

Section: A Characterization Of Sedimentary Saltmentioning

confidence: 99%

“…T HERE are several methods available to accurately measure in a laboratory environment the complex permittivity of discrete samples of solid dielectric media: some use time domain analysis [1], [2], other a shorted rectangular waveguide [3], [4], the method of cavity perturbation [5], [6], or the capacitance method [7]. There are also specific methods for low-permittivity and low-loss homogeneous materials [8], [9], for liquid dielectrics [10], [11] etc. There are other methods like spatial time domain reflectometry that allow for in situ soil moisture profile determination [12] or even the porosity distributions of water saturated granular media [13].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Large Scale Characterization of the Dielectric Properties of Heterogeneous Layered Rock Salt

Badescu

2020

IEEE Trans. Geosci. Remote Sensing

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Although there are several methods described in the literature to accurately measure the complex permittivity of solid dielectrics at radio frequencies in a laboratory environment, none of these methods allow for a large-scale accurate characterization of natural ionic dielectrics. The work presented here reports results of the dielectric permittivity retrieved from in situ measurements in a Romanian salt mine. Measurements were performed in the 164-174-MHz bandwidth, over a propagation distance of 100 m. The characteristics of the layers of sedimentary salt are determined from measurements using a least mean square fitting algorithm, based on a detailed propagation model for a heterogeneous medium. The coupling of the instrumentation is also considered. The proposed approach demonstrates great promise for a large number of applications.

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Time‐Modulated Metasurface‐Assisted Measurements

Ghasemi

Rajabalipanah

Tayarani

et al. 2021

Advanced Optical Materials

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This paper explores time‐modulated metasurface‐assisted waveguide setups for the unique and accurate permittivity and permeability extraction of lossy dispersive samples with phase‐less measurements. It is theoretically demonstrated that when the position of the short‐circuit termination is dynamically modulated in a predefined way, the phase information of the reflection S‐parameter manifests itself into the amplitude level of the emerging harmonics. Being insensitive to the calibration plane shifts and phase uncertainties in reflection measurements while bypassing a priori knowledge about the material under test (MUT) and also the transmission information, can be regarded as the main advantages of the proposed time‐modulated material characterization approach. Using a simple post‐processing step, several illustrative examples are presented to numerically verify the validity of the proposed approach for some applicable and practical types of homogeneous materials. Two possible realization schemes based on mechanical actuation and electrical phase control are comprehensively discussed. An uncertainty analysis to examine how realization tolerances can affect the accuracy of results is also performed. The effectiveness of the proposed method is further experimentally demonstrated using a programmable phase‐agile metasurface. By involving the temporal dimension, the proposed strategy takes a great step forward in the phase‐less reconstruction of electromagnetic parameters.

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A microwave method based on amplitude-only reflection measurements for permittivity determination of low-loss materials

Cited by 31 publications

References 59 publications

Non-resonant Permittivity Measurement Methods

Non-resonant Permittivity Measurement Methods

A Large Scale Characterization of the Dielectric Properties of Heterogeneous Layered Rock Salt

Time‐Modulated Metasurface‐Assisted Measurements

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