Metamaterial Tunable Filter Design

Abstract

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