Dielectric Studies on Some Industrially Important Rubber and Polymeric Materials at Microwave Frequencies

Gunasekaran, S.; Charles, Julie

doi:10.13005/msri/050124

Cited by 8 publications

(16 citation statements)

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“…There are several established techniques available to determine the dielectric properties of polymers, and several reports on the study of the dielectric properties of rubber appeared in the literature, conducted at various frequency ranges. Most involved the use of waveguide or probes [6,7], including our work based on free-space non-destructive testing [12]. These are standard methods based on Von-Hippel.…”

Section: Microwave Characterization Of Rubbermentioning

confidence: 99%

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Flexible Antennas Based on Natural Rubber

Awang

Affendi

Alias

et al. 2016

PIER C

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Abstract-Flexible substrates have been increasingly studied in recent years. This paper proposes natural rubber as a new substrate material for flexible antennas. In our work, prototype antennas were built using rubber formulated with different filler contents. Carbon black was used as the filler where its amount was varied to yield different dielectric properties. Prototype inset-feed microstrip patch antennas with outer dimensions 7.52 mm × 10.607 mm × 1.7 mm and copper as its conducting material were fabricated to operate at 2.45 GHz. The prototypes were measured and their performance analyzed in terms of the effects of filler content on Q, return loss and bending effects on their gain and radiation characteristics. The return loss and gain were found to be comparable to those built on existing synthetic substrates, but these new antennas offer an added feature of frequency-tunability by varying the filler content. Under bending conditions, these new antennas were also found to perform better than existing designs, showing less changes in their gain, frequency shift and beamwidth, in addition to less impedance mismatch when bent.

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Section: Microwave Characterization Of Rubbermentioning

confidence: 99%

“…There have been several reports on rubber previously but mostly have only focused on their dielectric [6][7][8] and thermo-mechanical [9] properties. There was an attempt to build antennas using EPDM rubber previously [10], but EPDM is synthetic rubber.…”

Section: Introductionmentioning

confidence: 99%

Flexible Antennas Based on Natural Rubber

Awang

Affendi

Alias

et al. 2016

PIER C

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“…Several reports on the study of the dielectric properties of rubber have appeared in the literature, and conducted at various frequenciy ranges, but all have involved the use of waveguide or probes, which constitute standard methods suggested by Robert and Von-Hippel [2,4]. In our work however, the microwave properties of rubber were obtained using microwave non-destructive technique (MNDT).…”

Section: Introductionmentioning

confidence: 99%

“…The retardance of rubber can be increased, and cracks can be reduced by adding the right amount of filler. Fillers can help enhance the viscoelastic response of rubber to deformation and increase its electrical conductivity [2]. Carbon is an excellent type of filler for both natural and synthetic rubbers because it can improve mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

“…Carbon is an excellent type of filler for both natural and synthetic rubbers because it can improve mechanical properties. The dielectric constant of rubber ε r is proportional to filler amount [2][3]. In addition, rubber can be withstand temperatures up to 150 o C -a property that is useful for antennas and sensors employed in extreme conditions.…”

Section: Introductionmentioning

confidence: 99%

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Microwave non-destructing testing of rubber at X-band

Affendi

Alias

Awang

et al. 2013

2013 IEEE International RF and Microwave Conference (RFM)

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In this paper, the measurement of complex dielectric constant of natural rubber at microwave frequencies is reported. A free space, non-destructive technique was used to measure the parameter for several rubber samples at X band. The samples were prepared using different amounts of carbon filler to alter the dielectric properties so that the relation between filler content and ε r can be investigated. Our studies show that ε r and tan δ increase with the filler content. In addition, ε r showed a decreasing trend, while tan δ increased with frequency.

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SBR/BiFeO₃ Elastomer Capacitor Films Prepared under Magnetic and Electric Fields Displaying Magnetoelectric Coupling

Medina¹,

Jorge

Rubi

et al. 2015

J. Phys. Chem. C

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The dielectric properties of elastomer composites formed by dispersions of bismuth ferrite (BiFeO 3) multiferroic filler particles in styrene− butadiene rubber (SBR) were studied. The SBR/BiFeO 3 films (10−100 μm) were prepared in the presence of electric (E) or magnetic fields (H), showing remarkable characteristics in comparison with systems obtained in its absence. The dispersed multiferroic fillers form clusters of much smaller size when prepared under E or H. The dielectric constant, ε (measured up to 1 MHz), increases with BiFeO 3 concentration until reaching saturation. The rise of ε was obtained at concentrations much lower for samples prepared in the presence of E or H than in its absence. Saturation is assigned to connectivity between filler clusters at the largest concentrations, increasing leakage currents and limiting the dielectric behavior. The whole dependence of ε with BiFeO 3 concentration was described using a proposed model. The dc resistivities, ρ, increase with BiFeO 3 concentration but remain high (ρ ≈ 10 GΩ•cm), allowing using the films as capacitors with filter action between 100 kHz and 7 MHz. The films prepared in the presence of H present strong dependence of the ferroelectric response with magnetic fields applied af ter preparation; that is, electromagnetic coupling was observed in those samples. 49 (SBR) embedded with Fe 3 O 4 −Ag superparamagnetic particles 50 by evaporating the solvent between two magnets. The particles 51 group forming needle-like structures aligned in the direction of 52 the magnetic field applied during preparation, providing the 53 anisotropic properties. The concentration threshold for 54 obtaining the desired effect is significantly reduced in 55 comparison with random composites. 9 56 Other devices of high relevance are elastomer/multiferroic 57 capacitors, where a multiferroic filler, which presents 58 simultaneously magnetic and electric orders at room temper-59 ature, 10,11 is dispersed in the elastomer polymer. The 60 exploration of these systems has already been started recently 61 using BiFeO 3 nanoparticles, which are the paradigmatic single-62 phase multiferroic compounds. 12−16 For instance, Bhadra et 63 al. 13 used the ferroelectric elastomer poly(vinylidene fluoride) 64 (PVDF), whose dielectric response was enhanced by randomly 65 dispersing BiFeO 3. Tamboli et al. and Ahlawat et al. reported

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Dielectric Studies on Some Industrially Important Rubber and Polymeric Materials at Microwave Frequencies

Cited by 8 publications

References 0 publications

Flexible Antennas Based on Natural Rubber

Flexible Antennas Based on Natural Rubber

Microwave non-destructing testing of rubber at X-band

SBR/BiFeO₃ Elastomer Capacitor Films Prepared under Magnetic and Electric Fields Displaying Magnetoelectric Coupling

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Dielectric Studies on Some Industrially Important Rubber and Polymeric Materials at Microwave Frequencies

Cited by 8 publications

References 0 publications

Flexible Antennas Based on Natural Rubber

Flexible Antennas Based on Natural Rubber

Microwave non-destructing testing of rubber at X-band

SBR/BiFeO3 Elastomer Capacitor Films Prepared under Magnetic and Electric Fields Displaying Magnetoelectric Coupling

Contact Info

Product

Resources

About

SBR/BiFeO₃ Elastomer Capacitor Films Prepared under Magnetic and Electric Fields Displaying Magnetoelectric Coupling