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Metamaterial split ring resonator using thin ferrite slab at GHz frequency

In this work a novel metamaterial with dual bands of resonant frequency with and without ferrite slab is shown. Without ferrite slab, the resonant frequency is seen to be 10.6 GHz and 31.6 GHz and with a thin ferrite slab (having thickness 0.0017 mm), the resonant frequency shifts to 9.5 GHz and 25.5 GHz. The shift in the frequency is due to the overall change in the effective inductance of the metamaterial unit cell. The transmission coefficient can be improved by 4% by decreasing the ferrite slab thickness from 0.0017 mm to 0.001 mm at 25.5 GHz. The transmission coefficient at 9.5GHz remains unchanged, i.e., 88%. The future applications of this design can be used in wireless power transfer by placing metamaterial design with ferrite at the mouth of the horn antenna to get better transmission efficiency. The metamaterial devices like cloaking, filters can be designed at a lower frequency with this design. The ferrite slab can be tuned to much lower frequencies by giving different magnetic bias.