  We investigated the microwave properties of polymer based metacomposites
containing hybridized parallel Fe- and Co-based microwire arrays. A dual-band
left-handed feature was observed in the frequency bands of 1.5 to 5.5 GHz and 9
to 17 GHz, indicated by two transmission windows associated with ferromagnetic
resonance of Fe-based microwires and long range dipolar resonance between the
wire arrays. The plasma frequency after hybridization is significantly
increased due to the enhanced effective diameter through the wire-wire
interactions between the Fe- and Co- microwire couples. These results offer
essential perspectives in designing the multi-band metamaterial for microwave
applications such as sensors and cloaking devices.
