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The complex permeability ( mu /sub r/) and permittivity ( epsilon /sub r/) spectra at X-band frequencies and their relationship with microwave absorbing properties are investigated in ferrite-rubber composite material. Multifrequency measurements of mu /sub r/ and epsilon /sub r/ 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 mu /sub r/ and epsilon /sub r/ spectra on the solution map of wave-impedance-matching. It is found that a proper combination of mu /sub r/ and epsilon /sub r/ is necessary to produce the zero-reflection absorber at a given frequency and thickness.>
Kim et al. (Fri,) studied this question.