This paper presents a new concept to
implement a tunable filter metamaterial with dual negative refraction composed
of ferrite slabs and metallic resonators, including split-ring resonators
(SRR), and short wire pairs. The ferrite slabs under an applied magnetics bias
provide one magnetic resonance frequency band and the metallic resonators provide
another one. The continuous wires within the metamaterials provide the negative
permittivity in a wide frequency band covering the two magnetic resonance
bands. This type of metamaterialis analyzed in detail, and tunable stop band
filters are successfully
designed. The effective electromagnetic parameters obtained from the simulation
of the S-parameters indicate that metamaterial exhibit negative refraction
bands, which can be shifted by changing the magnetic bias.
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