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A metamaterial absorber with a near-perfect absorption peak, which is tunable magnetically in an ultra-wide frequency range from 0.2 to 7.6GHz, is proposed and fabricated by combining a ferrite with a metastructure. In our design strategy, the adjustable resonance frequency of the ferrite by external magnetic field provides the tunability, while the metastructure of periodic metal strips eliminates...
M-type hexagonal ferrites with chemical composition Ba0.5Sr0.5CoxAlxFe12-2xO19 (x=0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) have been synthesized using a standard ceramic method. The electromagnetic or microwave parameters have been measured in the frequency range of 8.2 to 12.4GHz using a vector network analyzer. The microwave absorption or reflection loss (RL) of different compositions has been evaluated...
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