Microwave Conductivity Measurements of High Conductive Polyaniline Films

Rmili, Hatem; Miane, J. L.; Olinga, Thomas; Zangar, H.

doi:10.1080/10236660490890493

Cited by 8 publications

(10 citation statements)

References 19 publications

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“…The complex permittivity of IM7/977, an aerospace grade CFRP, [13] has been determined previously using surface resistance theory [14] and waveguide measurement methods [15]. The literature showed that unidirectional laminates are lossy with permittivities of ε 0 • = ε 90 • = 30 − 7.4j and ε 45 • = 32 − 9.2j, the angles being between the carbon fibres and the incident wave.…”

Section: Computational Methods and Simulation Parametersmentioning

confidence: 99%

The Role of Fibre Orientation on the Electromagnetic Performance of Waveguides Manufactured From Carbon Fibre Reinforced Plastic

Bojovschi¹,

Nicholson²,

Galehdar³

et al. 2012

PIER B

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Abstract-Aircraft skins manufactured from carbon fibre reinforced plastic (CFRP) can simultaneously support structural load and act as antennas. This offers the potential for disproportionately large antenna elements and arrays, and thus enhanced aircraft capability. The efficient design of such structures requires that the link between CFRP microstructure and electromagnetic performance be established. This paper presents a method of predicting the electromagnetic attenuation of waveguides manufactured from CFRP. The method considers both the orthotropic, complex conductivity of CFRP, high in the fibre direction and low transverse to it, and the local electric fields in waveguides, which vary with location and frequency. The method was validated experimentally using waveguides manufactured from aerospace grade IM7/977-3 prepreg tape with [

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Section: Computational Methods and Simulation Parametersmentioning

confidence: 99%

The Role of Fibre Orientation on the Electromagnetic Performance of Waveguides Manufactured From Carbon Fibre Reinforced Plastic

Bojovschi¹,

Nicholson²,

Galehdar³

et al. 2012

PIER B

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“…This would introduce an error in the measurements because the epoxy is a lossy dielectric and the effects of its losses on the conductivity should be considered. Here, the waveguide technique is used to measure the EM characteristics of CFRP [8,9]. Because the EM field is linearly polarized in the waveguide the anisotropic characteristics of the material can be measured.…”

Section: Conductivity Measurements Of Cfrpmentioning

confidence: 99%

“…In this case, the imaginary part of permittivity (ε = ε − j(ε + σ/ω)) is dominated by the conductivity term. The NRW equations cannot be used due to a lack of transmission, so the relationship between conductivity (σ) and reflection coefficient is derived from the surface resistance [9], as given by Eq. (7),…”

Section: Waveguide Measurement Of Qi Cfrpmentioning

confidence: 99%

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The Effect of Ply Orientation on the Performance of Antennas in or on Carbon Fiber Composites

Galehdar¹,

Rowe²,

Ghorbani³

et al. 2011

PIER

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Abstract-In this paper, the anisotropic conductivity effect of quasiisotropic carbon fiber laminates on conformal load-bearing antenna structures (CLAS) is presented. The conductivity of a quasi-isotropic IM7/977-3 CFRP laminate is measured using waveguide techniques. The results show that orientation of the surface ply relative to the polarization of the incident E-field has a major influence on the reflectivity. This difference is attributed to the fact that carbon fibres oriented parallel to the E-field plies behave as good conductors, while off-axis plies present as lossy dielectric layers with a finite conductivity. This anisotropic behavior of the ply layers is shown to have a distinctive influence on the operation of both microstrip patch and slot antennas.

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“…The hoping between the metallic islands or polaronic clusters are the reason behind the charge transport in Pani Films. Conducting polymers are usually classified as highly disordered systems [18].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Interference Shielding Efficiency Enhancement of the Pani-Csa Films at Broad Band Frequencies

Sasikumar¹,

Mol²,

George³

et al. 2017

PIER M

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A material sample of Camphour Sulphonic Acid doped Polyaniline (PANI-CSA) is contemplated towards its conceivable use as a microwave shield. Shielding towards electromagnetic interferences (EMI) is measured over various frequency bands by the waveguide method. Plane wave electromagnetic theory is used to generalize the overall reflection and transmission coefficients of the polymer. EMI shielding of the polymer, in the form of Shielding Efficiency (SE), is analyzed over the microwave frequency range from 2 to 18 GHz, demonstrating the potential value of the polymer as an electromagnetic interference (EMI) shield for commercial purposes. The shielding film is fabricated using standard procedure with CSA as the dopant and m-cresol as the solvent. The shielding effectiveness as high as 45 dB for the sample of PANI doped with CSA is observed.

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Microwave Conductivity Measurements of High Conductive Polyaniline Films

Cited by 8 publications

References 19 publications

The Role of Fibre Orientation on the Electromagnetic Performance of Waveguides Manufactured From Carbon Fibre Reinforced Plastic

The Role of Fibre Orientation on the Electromagnetic Performance of Waveguides Manufactured From Carbon Fibre Reinforced Plastic

The Effect of Ply Orientation on the Performance of Antennas in or on Carbon Fiber Composites

Electromagnetic Interference Shielding Efficiency Enhancement of the Pani-Csa Films at Broad Band Frequencies

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