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Complex Magnetic Permeability and Dielectric Permittivity of Ferrites in Millimeter Waves

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3 Author(s)
Korolev, K.A. ; Tufts Univ., Medford ; Shu Chen ; Afsar, M.N.

We report a first-time study of complex magnetic permeability and dielectric permittivity of 99% pure powdered barium cobalt ferrite (Ba2Co2Fe12O22) and pure solid barium hexaferrite ceramics (BaFe12O19) in a broadband millimeter-wave frequency range. We performed transmittance measurements using a free-space quasi-optical millimeter-wave spectrometer, equipped with a set of high-power backward-wave oscillators as sources of tunable coherent radiation at each Q-, V-, and W-frequency band. We calculated frequency dependences of complex permittivity for both types of ferrites using analysis of recorded high-precision transmittance spectra and obtained frequency dependences of the magnetic permeability from Schlomann's equation for partially magnetized ferrites.

Published in:

Magnetics, IEEE Transactions on  (Volume:44 ,  Issue: 4 )

Date of Publication:

April 2008

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