The microwave absorbing phenomena of ferrite microwave absorbers

Author

Shin, J.Y. ; Oh, J.H.

Author_Institution

Dept. of Ceramic Eng., Inha Univ., Inchon, South Korea

Volume

29

Issue

6

fYear

1993

fDate

11/1/1993 12:00:00 AM

Firstpage

3437

Lastpage

3439

Abstract

The complex permeability dispersions and the microwave absorbing phenomena are investigated in ferrite microwave absorbers. The complex permeability of hexagonal (Y- and Z-type) and spinel (NiZn ferrite and NiZnCo ferrite) ferrite microwave absorbers were measured in 200 MHz-16 GHz range. The theoretical matching frequencies are determined by plotting the measured complex permeability loci on the impedance matching solution map. One or two impedance matching phenomena are observed in the ferrite absorbers according to their complex permeability loci on the impedance matching solution map. It was discovered that the first matching frequency (f_m1) of the ferrite absorber strongly depends on its spin resonance frequency (f_r2) and the second matching frequency (f _m2) is independent of the resonance frequency

Keywords

electromagnetic wave absorption; ferrite devices; impedance matching; magnetic permeability; waveguide components; (NiZnCo)Fe₂O₄; 200 MHz to 16 GHz; Ba₂Ni₂Fe₁₂O₂₂; Ni_1-xZn_xFe₂O₄; Y-type; Z-type; complex permeability dispersions; ferrite microwave absorbers; hexagonal ferrites; impedance matching solution map; matching frequencies; microwave absorbing phenomena; spin resonance frequency; spinel ferrites; Calcination; Dielectric losses; Ferrites; Impedance matching; Permeability measurement; Permittivity measurement; Powders; Resonance; Resonant frequency; Scattering parameters;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.281188

Filename

281188