Electromagnetic wave absorption properties of amorphous alloy-ferrite-epoxy composites in quasi-microwave band

Lim, Kwanseop; Kim, M.C.; Lee, Kee‐Ahn; Park, C.G.

doi:10.1109/tmag.2003.810619

Cited by 52 publications

(30 citation statements)

References 9 publications

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“…The electromagnetic interference (EMI) problems have been attracting more attention recently due to the extensive growth in the application of electronic devices such as computer local area networks, mobiles phones, laptops, microwave oven etc [1][2][3]. EMI can cause severe interruption on electronically controlled systems.…”

Section: Introductionmentioning

confidence: 99%

Development of Radar Absorbing Nano Crystals under Thermal Irradiation

Sharma

Agarwala

2008

JNanoR

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) were synthesized by a modified flux method that combines the controlled chemical co-precipitation process for nucleation and complete uniform growth during in-situ annealing with NaCl flux under vacuum furnace. Uniform structure morphological transformation of nano crystals from spherical to prism faces were noticed after annealing with increasing temperatures from 200 to 1200 o C for 4 h in vacuum. XRD results showed the single phase nanocrystals of BaFe 18 O 27 with increasing crystallanity and size from 10 to 90 nm during annealing. FESEM and TEM were used to investigate the systematic growth processes of various morphologies of nano crystals. The effect of such systematic morphological transformation of nanocrystals was observed in dielectric, dynamic magnetic and refection loss (RL) properties in Kuband (12.4 -18.0 GHz). A significant increment from -15.23 dB to -43.65 dB with wide range of bandwidth in RL loss is noticed due to the symmetric morphological growth of single phase nano crystals of RAM during annealing. This process of crystal growth, morphology evolution and RL enhancement with respect to increasing temperature were also explained in terms of ostwald ripening and quantum size effect. IntroductionThe electromagnetic interference (EMI) problems have been attracting more attention recently due to the extensive growth in the application of electronic devices such as computer local area networks, mobiles phones, laptops, microwave oven etc [1][2][3]. EMI can cause severe interruption on electronically controlled systems. Furthermore, larger exposure to microwave energy can be potentially harmful to biological systems and human beings. To overcome EMI problems, it is suggested that electromagnetic wave absorbing materials with the capability of absorbing unwanted electromagnetic signals are to be used. For significant absorption of electromagnetic waves, the radar absorption material (RAM) should have electric and/or magnetic dipoles that interact with the electromagnetic fields in the radiation. Microwave absorption materials from magnetic to dielectric related materials used in a high frequency are particularly noticed. But, pure dielectric or magnetic materials are insufficient for absorbing radiation energy. The efficiency of magnetic-dielectric absorbers is high because the complex permittivity (ε΄-jε˝) and permeability (µ΄-jµ˝) differ from zero [4][5][6]. In general, the suitable values of RAM can be achieved by adding lossy fillers and/or magnetic particles to a light weight that are physically and chemically stable one and of course have a high ability to absorb electromagnetic wave radiation [7][8][9][10]. The composite approach has been used to improve various material properties, including mechanical, chemical, structural, optical and electrical/magnetic etc [11][12][13][14][15][16][17].

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Section: Introductionmentioning

confidence: 99%

Development of Radar Absorbing Nano Crystals under Thermal Irradiation

Sharma

Agarwala

2008

JNanoR

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“…It is found that the thickness of the absorber has a large influence on the microwave absorbing properties. The minimum RL peak gradually shifts toward lower frequency with the increase of absorber thickness, which follows the formula [21] …”

Section: Resultsmentioning

confidence: 78%

Enhanced microwave absorption properties of flake-shaped FePCB metallic glass/graphene composites

Chuai

Liu

et al. 2016

Composites Part A: Applied Science and Manufacturing

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“…This sample shows maximum reflection loss of −59.60 dB and given in Table 3. These can be explained on basis of the impedance matching criterion of a very good absorber [14,[20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] as follows: In case of a single layered absorber, the normalized input impedance (Z) with respect to the impedance in free space and reflection loss (RL) with respect to the normal incident plane wave are given by [7,12,13,16,17,[22][23][24][25][26][27][28][29][30][31][32][33][34][35][36]:…”

Section: Microwave Measurementsmentioning

confidence: 99%

“…With applications of electromagnetic (EM) wave in the high GHz ranges, the electromagnetic interference (EMI) problems have attracted more attention recently due to the extensive growth in the application of electronic devices and security, such as computer local area networks, mobiles phones, laptops, microwave oven, etc. [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Propagation and Absorbing Property of Ferrite-Polymer Nanocomposite Structure

Bayrakdar¹

2012

PIER M

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Abstract-We have synthesized ferrite-polymer nanocomposite structures and theoretically and experimentally investigated electromagnetic propagation, absorption properties of these nanocomposite materials at 8-20 GHz in microwave guides. The microwave properties of the samples were investigated by transmission line method, and reflection loss of −59.60 dB was found at 12 GHz for an absorber thickness of 2 mm. These nanocomposites may be attractive candidates for microwave absorption materials.

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Electromagnetic wave absorption properties of amorphous alloy-ferrite-epoxy composites in quasi-microwave band

Cited by 52 publications

References 9 publications

Development of Radar Absorbing Nano Crystals under Thermal Irradiation

Development of Radar Absorbing Nano Crystals under Thermal Irradiation

Enhanced microwave absorption properties of flake-shaped FePCB metallic glass/graphene composites

Electromagnetic Propagation and Absorbing Property of Ferrite-Polymer Nanocomposite Structure

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