| Title |
Electronic. Magnetic & Optical Material ; Electromagnetic Wave Absorption Properties of Amorphous Alloy-Ferrite-Epoxy Composites |
| Authors |
임경묵(K. M. Lim); 김문철(M. C. Kim); 이기안(K. A. Lee); 박찬경(C. G. Park) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Electromagnetic wave absorption; Amorphous alloy; Ni-Zn ferrite; Impedance matching frequency and thickness |
| Abstract |
The electromagnetic wave absorption properties of various amorphous alloy-ferrite-epoxy composites have been investigated in a frequency range from 1 to 5 GH_Z. The fraction of amorphous alloy in the composites was varied from 0 to 50 vol.% at a fixed 50 vol.% fraction of epoxy resin polymer. The complex permeability(μ) and permittivity (ε) of the composites were measured by reflection/transmission technique. Both the matching frequency and thickness for maximizing reflection loss of the composites were theoritically determined by plotting the measured μ and ε on an impedance matching solution map. The increase of amorphous alloy fraction in amorphous alloy-ferrite-epoxy composites improved electromagnetic wave absorption properites, i.e, a larger matching frequency and thinner thickness compared with the ferrite-epoxy composite. On the basis of these results, a new thinner wave absorber is proposed by the optimization of amorphous alloy fraction and thickness in amorphous alloy-ferrite-epoxy composites. |