Title :
Broadband microwave absorber using M-type hexagonal ferrite
Author :
Ota, Hiroyasu ; Kimura, Masafumi ; Sato, Risaburo ; Okayama, Katsumi ; Kondo, Shin-Ichi ; Homma, Motofumi
Author_Institution :
Electromagn. Compatibility Res. Labs. Co. Ltd., Miyagi, Japan
Abstract :
The microwave absorption properties of M-type hexagonal ferrite BaFe12-X(Ti0.5Mn0.5)XO 19 composite have been investigated. It was found that the complex permeability and μ\´r and μ"r induced by the ferrimagnetic resonance can be controlled both in amplitude and along the frequency axis by changing the substitution amount x and the powder mixture ratio. The complex permeability of TiMn substituted ferrite composite was successfully adjusted to the calculated absorption condition, and exhibited a wide absorption bandwidth Δf/f=47% in the X-band with a homogeneous single-layer configuration. The mixture of two kinds of ferrite powder exhibited a wider bandwidth of 53% and a simulated model indicates that it should be possible to obtain a further increase
Keywords :
barium compounds; composite materials; electromagnetic shielding; electromagnetic wave absorption; ferrimagnetic resonance; ferrites; magnetic permeability; powders; Ba(FeTiMn)12O19; BaFe12-X(Ti0.5Mn0.5)X O19 composite; M-type hexagonal ferrite; TiMn substituted ferrite composite; X-band; absorption condition; broadband microwave absorber; complex permeability; ferrimagnetic resonance; ferrite powder; homogeneous single-layer configuration; microwave absorption properties; powder mixture ratio; simulated model; wide absorption bandwidth; Absorption; Bandwidth; Ferrimagnetic materials; Ferrites; Frequency; Impedance; Optical reflection; Permeability; Powders; Resonance;
Conference_Titel :
Electromagnetic Compatibility, 1999 IEEE International Symposium on
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-5057-X
DOI :
10.1109/ISEMC.1999.810082
