Abstract
A series of NiZn-ferrite/Co2Z-hexaferrite composite ferrites were successfully synthesized by the solid-state reaction method for their potential application as magneto-dielectric antenna substrate materials. It is found that, with the increasing amount of NiZn ferrite (x) from 55 wt% to 70 wt%, the real permeability μ' at low frequencies is improved from ~10 to ~19, while the real permittivity e' varies slightly with value around 14. The sample with wt % has almost equal values of μ' and e', large miniaturization factor about 15, as well as sufficiently low dielectric and magnetic loss (1-50 MHz). This composite ferrite is very useful to the design of miniaturized antenna with good impedance-matched to free space.
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