A free-space method for microwave characterization of materials in aerospace application

Brancaccio, Adriana; D'Alterio, Giuliana; Stefano, E. De; Guida, L. Di; Féo, M.; Luce, S.

doi:10.1109/metroaerospace.2014.6865962

Cited by 12 publications

(6 citation statements)

References 7 publications

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“…It results in 8 , that is s(t). Observation of the signal in time domain allows to specify the limits of the gate time interval g t 1 and g t 2 , in 9 . For instance in Figures 8 and 9 this interval could be chosen as g t 1 = −0.5 ns and g t 2 = 0.5 ns, so that the main lobe of the signal is preserved.…”

Section: Discussionmentioning

confidence: 99%

“…In particular, measurement with empty setup (air) S (air) 11 allows to evaluate the contributions indicated by the arrows 1 and 7. In this way, S (air) 11 should be subtracted to S 11 for calibration, as in (9). Then, MUT measurement is normalized with that in the presence of the metal plate (metal), whose ideal reflection coefficient is −1.…”

Section: Calibrationmentioning

confidence: 99%

“…The FSM is contactless, requires little sample preparation and is suitable for heterogeneous samples. It can be used for measuring large flat solids, materials under high temperature [7], liquids [8], gases [1,6], radomes in aerospace [9], multi-layered dielectrics [10], composite materials and metamaterials [11][12][13][14]. One should note that the effective response, the non-invasive nature and the wideband operation are essential in many actual applications.…”

Section: Introductionmentioning

confidence: 99%

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Free-Space Materials Characterization by Reflection and Transmission Measurements using Frequency-by-Frequency and Multi-Frequency Algorithms

Gonçalves

Pinto²,

Mesquita

et al. 2018

Electronics

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The knowledge of the electromagnetic constitutive properties of materials is crucial in many applications. Free-space methods are widely used for this purpose, despite their inherent practical difficulties. This paper describes an affordable free-space experimental setup for the characterization of flat samples in 1–6 GHz in a non-anechoic environment. The extracted properties are obtained from the calibrated Scattering Parameters, using a frequency-by-frequency solution or a multi-frequency reconstruction. For the first, we describe how the Time-Domain Gating can be implemented and used for filtering the signals. For the latter, a weighting factor is introduced to balance the reflection and transmission data, allowing one to have a more favorable configuration. The different role of transmission and reflection measurements on the achievable results is analyzed with regard to experimental uncertainties and different noise scenarios. Results from the two strategies are analyzed and compared. Good agreement between simulation, measurement and literature is obtained. According to the reported results for dielectric materials, there is no need of filtering the data by a Time-Domain Gating in case of the multi-frequency approach. Experimental results for Polymethylmethacrylate (PMMA) and Polytetrafluorethylene (PTFE) samples validate both the setup and the processing.

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Section: Discussionmentioning

confidence: 99%

Section: Calibrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Free-Space Materials Characterization by Reflection and Transmission Measurements using Frequency-by-Frequency and Multi-Frequency Algorithms

Gonçalves

Pinto²,

Mesquita

et al. 2018

Electronics

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“…The free space method [12] is a nondestructive technique that can be used in a large frequency band. A schematic of the microwave measurement setup is given in Fig.…”

Section: Free Space Techniquementioning

confidence: 99%

On the choice of the dielectric characterization method for foam composite absorber material

Pometcu

Mejean

Benzerga

et al. 2017

Materials Research Bulletin

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International audienceAbstractThis paper presents the characterization by three different techniques of a new lossy material made of carbon fibers loaded epoxy foam that can be used as an absorber in anechoic-chambers. The composite was characterized using free space, waveguide and coaxial probe techniques. Dielectric characteristics obtained from the three techniques are different and this is explained by the required dimensions of measured samples, not always representative of the porous form of the composites loaded with long fibers. Our study points out that the free space technique is the most appropriate to measure such composite samples with porosities and load having millimeter dimensions. Dielectric probe and waveguide are not suitable due to a small volume of measure which is not representative of the entire composite. The achieved prototype confirmed this result with a measured reflection coefficient very close to the simulation achieved with the dielectric characteristics obtained by the free space technique

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“…2 Some reductions of the required sample size for free space microwave measurements have been demonstrated by incorporating spot-focusing horn antennas, 8,12 but this technique is limited in bandwidth due to the focusing nature of the lenses.…”

Section: Introductionmentioning

confidence: 99%

Method for material characterization in a non-anechoic environment

Pometcu

Sharaiha

Benzerga

et al. 2016

Applied Physics Letters

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This paper presents a characterization method for extracting the reflection coefficient of materials and the real part of their permittivity. The characterization is performed in a real environment, as opposed to the classical measurement methods that require an anechoic chamber. In order to reduce the effects of the multipath propagation, a free space bistatic measurement was performed at different distances Material-Antennas in far field. By using a Teflon sample and a commercial absorbing material sample, measurements have been performed in order to validate the characterization technique.

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A free-space method for microwave characterization of materials in aerospace application

Cited by 12 publications

References 7 publications

Free-Space Materials Characterization by Reflection and Transmission Measurements using Frequency-by-Frequency and Multi-Frequency Algorithms

Free-Space Materials Characterization by Reflection and Transmission Measurements using Frequency-by-Frequency and Multi-Frequency Algorithms

On the choice of the dielectric characterization method for foam composite absorber material

Method for material characterization in a non-anechoic environment

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