Application of Ferrite to Electromagnetic Wave Absorber and its Characteristics

Naito,; Suetake,

doi:10.1109/gmtt.1970.1122824

Cited by 23 publications

(22 citation statements)

References 1 publication

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“…Excellent microwave absorbing materials in the desired frequency range with wide band width must satisfy two fundamental conditions [15,16], (i) the incident electromagnetic wave penetrates the absorber by the greatest extent (impedance match) and (ii) the wave entering into the materials is entirely attenuated and absorbed within the finite thickness of the absorber. The level of absorptivity of an absorber is measured quantitatively using reflection loss in decibels.…”

Section: Introductionmentioning

confidence: 99%

A microwave absorber based on strontium ferrite–carbon black–nitrile rubber for S and X-band applications

Vinayasree

Soloman²,

Sunny³

et al. 2013

Composites Science and Technology

109

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Section: Introductionmentioning

confidence: 99%

A microwave absorber based on strontium ferrite–carbon black–nitrile rubber for S and X-band applications

Vinayasree

Soloman²,

Sunny³

et al. 2013

Composites Science and Technology

109

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“…According to the transmission line theory, the RL values can be calculated through the following equations [40]:…”

Section: Resultsmentioning

confidence: 99%

Enhanced Polarization in Tadpole-Shaped (Ni, Al)/Aln Nanoparticles and Microwave Absorption at High Frequencies

Huang¹,

Xue²,

Lü³

et al. 2011

PIER B

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Abstract-Tadpole-shaped (Ni, Al)/AlN nanoparticles were synthesized via evaporating Ni-Al alloy in a mixed atmosphere of N 2 and H 2 . As a counterpart, the spherical-shaped (Ni, Al)/Al 2 O 3 nanoparticles were also prepared from the same target alloy while in a mixture of Ar and H 2 . The electromagnetic parameters of as-made nanoparticles/paraffin composites were then investigated in the frequency range of 2-18 GHz. Excellent microwave absorption can be obtained for the tadpole-shaped (Ni, Al)/AlN-paraffin composite at high frequencies and in a thin layer, which is thought to be the result of the enhanced polarization in the anisotropic tadpole-shaped nanoparticles. With the increasing of the composite thickness, the frequency of effective reflection loss shifts towards lower frequencies due to an improved impedance match and absorption.

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“…The return loss (RL) curves of the conductor-backed samples was obtained from the following equation [16,48]:…”

Section: Microwave Absorption Propertiesmentioning

confidence: 99%

Manganese and Zinc Spinel Ferrites Blended with Multi-Walled Carbon Nanotubes as Microwave Absorbing Materials

et al. 2017

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Magnetic and dielectric materials can be blended to enhance absorption properties at microwave frequencies, although the materials may have relatively weak attenuation capabilities by themselves. The specific goal of this work is to enhance microwave absorption properties of materials with interesting dielectric behavior by blending them with magnetic materials based on transition metals. The synthesized Mn 1−x Zn x Fe 2 O 4 (x = 0.0 and 1.0) spinel ferrite nanoparticles (MZF NPs) were blended with commercial multi-walled carbon nanotubes (MWCNTs) in various proportions with a binder matrix of paraffin. This simple and efficient process did not cause a significant variation in the energy states of MWCNTs. MZF NPs were synthesized with a citric acid assisted sol-gel method. Their electromagnetic characteristics and microwave absorption properties were investigated. These properties were derived from the microwave scattering parameters measured via the transmission line technique by using a vector network analyzer (VNA) in conjunction with an X band waveguide system. The return loss (RL) values of the samples were obtained from the electromagnetic constitutive parameters (permittivity and permeability). The results indicate that the minimum RL value and the bandwidth change significantly with the amount of ferrite material in the blend. These results encourage further development of MWCNTs blended with ferrite nanoparticles for broadband microwave applications.

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Application of Ferrite to Electromagnetic Wave Absorber and its Characteristics

Cited by 23 publications

References 1 publication

A microwave absorber based on strontium ferrite–carbon black–nitrile rubber for S and X-band applications

A microwave absorber based on strontium ferrite–carbon black–nitrile rubber for S and X-band applications

Enhanced Polarization in Tadpole-Shaped (Ni, Al)/Aln Nanoparticles and Microwave Absorption at High Frequencies

Manganese and Zinc Spinel Ferrites Blended with Multi-Walled Carbon Nanotubes as Microwave Absorbing Materials

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