Journal ArticleDOI
Application of Ferrite to Electromagnetic Wave Absorber and its Characteristics
Y. Naito,K. Suetake +1 more
- Vol. 19, Iss: 1, pp 65-72
TLDR
In this article, an electromagnetic wave absorber utilizing ferrite or rubber ferrite composed of ferrite powder and rubber is described and the existence of a matching frequency and a matching thickness t/sub m/ has been found.Abstract:
An electromagnetic wave absorber utilizing ferrite or rubber ferrite composed of ferrite powder and rubber is described. In our investigation, the existence of a matching frequency f/sub m/ and a matching thickness t/sub m/ has been found. The terms f/sub m/ and t/sub m/ mean that the ferrite which is backed with a conducting plate can be a perfect absorber only under the conditions that the frequency of the incident wave is f/sub m/ and that the thickness of the ferrite is t/sub m/.Each ferrite has two matching frequencies f/sub m1/, f/sub m2/, (f/sub m1<f/sub m2/) and two matching thicknesses t/sub m1/, t/sub m2/, respectively. The f/sub m1/ of solid ferrite cannot be beyond 2 GHz. Through the development of rubber ferrite, the upper limit of f/sub m1/ can be overcome and f/sub m2/ ranges from 4 to 12 GHz. The matching thickness t/sub m1/ is a simple function of Snoek's value S and ranges from 4 to 10 mm regardless of f/sub m1/. The superiority of ferrite or rubber ferrite to lossy dielectric material as an absorber has been noticed in the frequency range under 7.5 GHz. The characteristics of matched load at 77/spl deg/K was investigated with success.read more
Citations
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Journal ArticleDOI
Microwave absorption properties of the carbon-coated nickel nanocapsules
TL;DR: In this article, the carbon-coated Ni(C) nanocapsules were prepared by a modified arc-discharge method in methane atmosphere and their electromagnetic parameters were measured at 2-18GHz.
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Microwave Absorption Properties of Carbon Nanocoils Coated with Highly Controlled Magnetic Materials by Atomic Layer Deposition
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Overview of carbon nanostructures and nanocomposites for electromagnetic wave shielding
Chao Wang,Chao Wang,Vignesh Murugadoss,Vignesh Murugadoss,Jie Kong,Zhenfeng He,Xianmin Mai,Qian Shao,Yanjun Chen,Li Guo,Chuntai Liu,Subramania Angaiah,Zhanhu Guo +12 more
TL;DR: In this article, the authors discussed the factors of microstructural defects, filler concentration, filler alignment, filler inherent conductivity and the surrounding temperature of carbon nanostructures and their composites.
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Three-dimensional reduced graphene oxide foam modified with ZnO nanowires for enhanced microwave absorption properties
TL;DR: In this paper, a hierarchical reduced graphene oxide (RGO) foams decorated with in-situ grown ZnO nanowires (ZnO nws ) were realized by a direct freeze-drying and hydrothermal process.
References
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Proceedings ArticleDOI
A Broadband Absorbing Wall for VHF Range Utilizing Thin Ferrite Tiles
TL;DR: In this article, the authors presented a new idea for the synthesis method of the thin absorbing wall with ferrite plates for U.H.F. range anechoic chamber, which has been proved that the broadband absorbing wall made of dielectric material -such as foamed polystyrene captaining carbon powder or parallel resistive sheets -has the limit in its thickness.