Title :
Complex permeability and permittivity and microwave absorption of ferrite-rubber composite at X-band frequencies
Author :
Kim, S.S. ; Jo, S.B. ; Gueon, K.I. ; Choi, K.K. ; Kim, J.M. ; Churn, K.S.
Author_Institution :
Agency for Defense Dev., Taejon, South Korea
fDate :
11/1/1991 12:00:00 AM
Abstract :
The complex permeability (μr) and permittivity (εr) spectra at X-band frequencies and their relationship with microwave absorbing properties are investigated in ferrite-rubber composite material. Multifrequency measurements of μ r and εr are made by the reflection/transmission technique. The theoretical determination of matching frequency and matching thickness and minimum reflection loss can be made by plotting the observed μr and εr spectra on the solution map of wave-impedance-matching. It is found that a proper combination of μr and εr is necessary to produce the zero-reflection absorber at a given frequency and thickness
Keywords :
electromagnetic wave absorption; ferrites; filled polymers; impedance matching; magnetic permeability; permittivity; rubber; X-band frequencies; complex permeability; ferrite-rubber composite; matching thickness; microwave absorption; minimum reflection loss; permittivity spectra; reflection/transmission technique; wave-impedance-matching; zero-reflection absorber; Composite materials; Conducting materials; Electromagnetic wave absorption; Ferrites; Frequency; Magnetic materials; Permeability; Permittivity measurement; Reflection; Rubber;
Journal_Title :
Magnetics, IEEE Transactions on
