Complex permittivity, complex permeability and microwave absorption properties of ferrite–polymer composites

Abbas, S. M.; Dixit, A. K.; Chatterjee, R.; Goel, T. C.

doi:10.1016/j.jmmm.2006.06.006

Cited by 321 publications

(109 citation statements)

References 15 publications

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“…To infer a mechanism of microwave absorption, we determined the real and imaginary parts of complex permittivity ( ˊ, ˝) and permeability (ˊ, ˝) from the scattering parameters S11&S21 by using the Nicolson-Ross-Weir (NRW) method ,where the real part ( polarization and by dipole relaxation to dielectric loss (˝) [7].…”

Section: Relative Complex Permittivity and Permeabilitymentioning

confidence: 99%

Preparation of Ferrimagnetics-Ferroelectrics Composites and Studying Their Microwave Characteristics at X-Band Region

Mubarak¹,

Azhdar²,

Alwan³

et al. 2017

djps

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M-type barium hexaferrite (BaFe12O19) was prepared using sol-gel auto combustion method which represents substantial magnetic materials and utilized as microwave absorbers. In addition barium titanate powder was prepared using conventional ceramic method as ferroelectric material. XRD tests showed that the ferrite possess hexagonal structure and barium titanate has tetragonal structure. The constituents then mixed with different ratios and dissipated in the epoxy-resin as the sticky and fixed medium. Microwave absorbing characteristic studied within X-band region using VNA (Vector Network Analyzer). The complex permittivity and permeability were calculated using Nicolson-Ross-Weir (NRW) method. Maximum reflection loss was -36.83dB at 9.125GHz observed for the samples A1:3 (ferrite: barium titanate) the ratio equal 1:3 due to good matching between the relative permeability and relative permittivity ,likewise the absorbing properties increases with the concentration of Barium hexaferrite in composite materials because it appeared absorption resonance frequency at 11.025 GHz.Keywords: barium titanate, hexagonal phase,VNA, NRW.

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Section: Relative Complex Permittivity and Permeabilitymentioning

confidence: 99%

Preparation of Ferrimagnetics-Ferroelectrics Composites and Studying Their Microwave Characteristics at X-Band Region

Mubarak¹,

Azhdar²,

Alwan³

et al. 2017

djps

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“…The oscillatory behavior can be justified on the basis that the Ba 2+ , with different coordination numbers. Therefore, dipoles having different relaxation times are formed, 23,24 possibly leading to such behavior of the real part of the permittivity in these frequency bands. Similar behavior of e¢ was reported earlier in other frequency bands.…”

Section: Electromagnetic Spectramentioning

confidence: 99%

“…Similar behavior of e¢ was reported earlier in other frequency bands. 23,24 Resonance peaks are observed at the higher side of the Ka band in the e¢ spectrum, shifting towards higher frequency (from 36.49 GHz for x = 0.0 to 38.38 GHz for x = 0.4 and 38.92 GHz for x = 1.0) with doping. Also, the resonance peaks in the spectra are observed to widen (increased Dx) with increasing x.…”

Section: Electromagnetic Spectramentioning

confidence: 99%

Thickness and Composition Tailoring of K- and Ka-Band Microwave Absorption of BaCo x Ti x Fe(12−2x)O19 Ferrites

Narang

Pubby

Singh

2016

Journal of Elec Materi

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The goal of this research is to investigate the electromagnetic and microwave absorption properties of M-type barium hexaferrites with chemical formula BaCo x Ti x Fe (12À2x) O 19 (x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) in K and Ka band. Characterization techniques such as x-ray diffraction analysis and scanning electron microscopy were applied to confirm ferrite formation. The frequency dependence of the complex permittivity and complex permeability was studied for prepared ferrite samples in the frequency range from 18 GHz to 40 GHz. Factors such as the quarter-wavelength condition, impedance matching, high dielectric-magnetic losses, as well as ferromagnetic resonance were investigated to determine their contribution to the absorption characteristics. It was found that the quarter-wavelength (k/4) model could be successfully applied to predict and understand the position as well as number of reflection peaks in the microwave absorption spectrum. The origin of the reflection loss peaks is explained and verified based on calculations of input impedance, loss tangent, and ferromagnetic resonance. Reflection loss analysis revealed that all six compositions exhibited reflection loss peaks (absorption >90%) at their matching thicknesses and frequencies. Therefore, these ferrites are potential candidates for use in electromagnetic shielding applications requiring low reflectivity in K and Ka band.

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“…The microwave absorbing materials have been greatly used in the masking technology of aircraft, television image interference of the tall buildings and microwave dark-room as well as electromagnetic interference (EMI) [1][2][3][4]. In the last four decades, conducting polymers (CPs) have gained a special status owing to wealth of applications [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Nanosized amorphous (Co‚ Fe) oxide particles decorated PANI–CNT: facile synthesis‚ characterization‚ magnetic‚ electromagnetic properties and their application

et al. 2017

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In this research (PANI/CNT) core/shell nanocomposite were synthesized via in situ chemical oxidative seeding polymerization‚ the results of SEM indicated the structure of synthesized nanocomposite. TEM‚ FTIR‚ UV-Vis‚ XRD analyses of samples showed that this nanocomposite is decorated with (Fe‚ Co) oxide nanoparticles. The VSM test of as prepared and annealed nanocomposite exhibited the saturated magnetization of 1.1 and 3.86 emu/g, respectively; the coercivity values were also − 350 and − 110 Oe, respectively. The reflection loss characteristics of (Fe‚ Co) oxide-Pani-CNT core/shell nanocomposite were also investigated with a vector network analyzer‚ in the 8.2-12.4 GHz range (X band). The maximum absorption increases with enhancement of the dispersed nanoparticles percent in polyurethane matrix from 1 to 10%. The value of the maximum reflection loss in the absorption samples with 1 and 10% of nanoparticles is − 2.14 dB at 9.33 GHz and − 7.32 dB at 11.97 GHZ, respectively.

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Complex permittivity, complex permeability and microwave absorption properties of ferrite–polymer composites

Cited by 321 publications

References 15 publications

Preparation of Ferrimagnetics-Ferroelectrics Composites and Studying Their Microwave Characteristics at X-Band Region

Preparation of Ferrimagnetics-Ferroelectrics Composites and Studying Their Microwave Characteristics at X-Band Region

Thickness and Composition Tailoring of K- and Ka-Band Microwave Absorption of BaCo x Ti x Fe(12−2x)O19 Ferrites

Nanosized amorphous (Co‚ Fe) oxide particles decorated PANI–CNT: facile synthesis‚ characterization‚ magnetic‚ electromagnetic properties and their application

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