We have measured the complex permeability and permittivity spectra of Co2Z/epoxy composites for different volume concentrations Vcvarying from 0.2 to 0.6. The effects of Vcon matching and bandwidth properties have been studied. For Vcges 0.5, there exist two matching points. The first matching, occurring away from the magnetic resonance region, has its origin in the quarter-wavelength matching, while the second matching is related to magnetic resonance. Both matchings are perfect, i.e., reflectivity |R| (dB) = -infin can be theoretically achieved. For Vcles 0.4, only one matching, the first matching, is found. At the matching point, |R| (dB) is finite. |R| (dB) decreases with decreasing Vc, due to the decrease in tan deltamand epsi'. In addition, with an increase in Vc, the percentage bandwidth DeltaWpincreases and the corresponding optimum thickness todecreases. A Co2Z/epoxy composite with Vc= 0.6 can achieve DeltaWp= 90% for reflectivity |R| (dB)< -10 dB at a thickness of 0.30 cm.
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Li et al. (2008) studied this question.
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