Title :
Complex permittivity and permeability measurements of ferrite powders at millimeter waves
Author :
Korolev, Konstantin A. ; Subramanian, Lakshmi ; Afsar, Mohammed N.
Author_Institution :
Dept. of Electr. & Comput. Eng., Tufts Univ., Medford, MA, USA
Abstract :
We present the complex dielectric permittivity and magnetic permeability characteristics of barium and strontium ferrite powders of different specific gravity in the Q-, V- and W-band frequency ranges. The measurements have been done using free-space quasi-optical millimeter wave spectrometer with a backward-wave oscillator as a tunable source of coherent radiation. Dielectric and magnetic parameters of the ferrite powders have been calculated by matching the theoretical curves to the experimental transmittance spectra using a best-fit method. The magnetic properties of the ferrite powders as a function of frequency have been analyzed.
Keywords :
barium; ferrites; magnetic particles; magnetic permeability; millimetre wave spectroscopy; permittivity; spectrometers; strontium; Q-band frequency range; V-band frequency range; W-band frequency range; backward-wave oscillator; barium ferrite powders; best-fit method; coherent radiation source; complex dielectric permittivity; complex permittivity measurement; free-space quasi-optical millimeter wave spectrometer; magnetic permeability; millimeter waves; permeability measurement; strontium ferrite powders; transmittance spectra; Barium; Dielectrics; Ferrites; Frequency; Millimeter wave measurements; Millimeter wave technology; Permeability measurement; Permittivity; Powders; Strontium;
Conference_Titel :
Microwave Conference, 2005 European
Print_ISBN :
2-9600551-2-8
DOI :
10.1109/EUMC.2005.1610100
