Radar Absorbing Materials

Vinoy, K. J.; Jha, Rakesh Mohan

doi:10.1007/978-1-4613-0473-9

Cited by 397 publications

(101 citation statements)

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“…The reflection loss of composites backed by a perfect reflector can be derived from the measured complex dielectric permittivity and magnetic permeability using transmission line theory. 14,36 A single layer absorber backed by perfect reflector in air works on the principle of impedance matching between air…”

Section: Methodsmentioning

confidence: 99%

Flexible microwave absorbers based on barium hexaferrite, carbon black, and nitrile rubber for 2–12 GHz applications

Vinayasree

Soloman²,

Sunny³

et al. 2014

Journal of Applied Physics

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Flexile single layer electromagnetic wave absorbers were designed by incorporating appropriate amounts of carbon black in a nitrile butadiene rubber matrix along with an optimized amount of magnetic counterpart, namely, barium hexaferrite for applications in S, C, and X-bands. Effective dielectric permittivity and magnetic permeability were measured using cavity perturbation method in the frequency range of 2–12 GHz. The microwave absorbing characteristics of the composites were studied in the S, C, and X-bands employing a model in which an electromagnetic wave is incident normally on a metal terminated single layer. Reflection loss exceeding −20 dB is obtained for all the samples in a wide frequency range of 2–12 GHz when an appropriate absorber thickness between 5 and 9 mm is chosen. The impact of carbon black is clearly observed in the optimized composites on the mechanical strength, thickness, band width of absorption, dielectric properties, and absorptivity.

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Section: Methodsmentioning

confidence: 99%

Flexible microwave absorbers based on barium hexaferrite, carbon black, and nitrile rubber for 2–12 GHz applications

Vinayasree

Soloman²,

Sunny³

et al. 2014

Journal of Applied Physics

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“…Magnetic nano sized ferrite particles have found a significant potential in many applications, such as magnetic recording media, ferrofluids and radar absorbing coatings [1,2]. Also an extensive investigation is continuing on soft magnetic materials for their uses mainly in microwave devices.…”

Section: Introductionmentioning

confidence: 99%

Preparation of nano‐sized manganese ferrite (MnFe₂O₄) via coprecipitation method

Amighian

Mozaffari

Nasr

2006

Phys. Status Solidi (c)

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Nano-sized manganese ferrite (MnFe 2 O 4 ) powder has been synthesized via coprecipitation method, using FeSO 4 .7H 2 O and MnSO 4 .H 2 O as starting materials. An aqueous solution of the starting materials, containing Fe 2+ and Mn 2+ in the ratio required in the ferrite, was poured into an NaOH alkaline solution. A greenish precipitate was formed, which carefully washed and dried for 6 h at 80 °C. The dried powder was then heated for 2 h at different temperatures in argon atmosphere and then rapidly cooled to room temperature, using water quenching. XRD patterns of the samples show that the sample annealed at 1050 °C is single phase. Also using Scherrer's formula a mean crystallite size of 80 nm was obtained. Magnetic measurements were performed on cold pressed pellets, using a sensitive permeameter with a maximum field of 1.2 T. The results show that a single phase MnFe 2 O 4 nano-sized powder can be obtained at annealing temperature of 1050 °C, which is lower than 1250 °C related to the annealing temperature of the same ferrite, prepared by the conventional ceramic technique. Saturation magnetization of the single-phase sample was 1330 G, which is lower than 5000 G related to a bulk sample. The difference between the values is reasonable, because the magnetic measurements were performed on cold-pressed unsintered nano sized powders.

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“…Some new advanced absorbers represent another equally important area that can bene t from using magneto-dielectric composites and metamaterials, being capable to reducing the radar cross-section of large objects [7].…”

Section: Introductionmentioning

confidence: 99%

On Current and Prospective Use of Binary Thin Multilayers in Radar Absorbing Structures

Kapelewski

2013

Acta Phys. Pol. A

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The main objective of the paper is to overview of the actual and potential capabilities of some complex multilayers to enhance, and control the microwave absorption. Going through available literature data we emphasize the role of interphase coupling, and material resonances in enhancing phenomena of importance for internal scattering, di usions, and intrinsic material absorption of propagating EM wave, especially in microwave and mm wave ranges. The theoretical background is consequently formulated in terms of transmissions line approach.

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Radar Absorbing Materials

Cited by 397 publications

References 0 publications

Flexible microwave absorbers based on barium hexaferrite, carbon black, and nitrile rubber for 2–12 GHz applications

Flexible microwave absorbers based on barium hexaferrite, carbon black, and nitrile rubber for 2–12 GHz applications

Preparation of nano‐sized manganese ferrite (MnFe₂O₄) via coprecipitation method

On Current and Prospective Use of Binary Thin Multilayers in Radar Absorbing Structures

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Radar Absorbing Materials

Cited by 397 publications

References 0 publications

Flexible microwave absorbers based on barium hexaferrite, carbon black, and nitrile rubber for 2–12 GHz applications

Flexible microwave absorbers based on barium hexaferrite, carbon black, and nitrile rubber for 2–12 GHz applications

Preparation of nano‐sized manganese ferrite (MnFe2O4) via coprecipitation method

On Current and Prospective Use of Binary Thin Multilayers in Radar Absorbing Structures

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Preparation of nano‐sized manganese ferrite (MnFe₂O₄) via coprecipitation method