title: Tunable dual-band negative refractive index in ferrite-based metamaterials.
abstract: A tunable dual-band ferrite-based metamaterial has been investigated by experiments and simulations. The negative permeability is realized around the ferromagnetic resonance (FMR) frequency which can be influenced by the dimension of the ferrites. Due to having two negative permeability frequency regions around the two FMR frequencies, the metamaterials consisting of metallic wires and ferrite rods with different sizes possess two passbands in the transmission spectra. The microwave transmission properties of the ferrite-based metamaterials can be not only tuned by the applied magnetic field, but also adjusted by the dimension of the ferrite rods. A good agreement between experimental and simulated results is demonstrated, which confirms that the tunable dual-band ferrite-based metamaterials can be used for cloaks, antennas and absorbers.
authors.affiliation: State Key Laboratory of New Ceramics and Fine Processing, School of materials science and engineering, Tsinghua University, Beijing 100084, China.
authors.forename: Ke
authors.initials: K
authors.lastname: Bi
authors.forename: Ji
authors.initials: J
authors.lastname: Zhou
authors.forename: Hongjie
authors.initials: H
authors.lastname: Zhao
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Liu
authors.forename: Chuwen
authors.initials: C
authors.lastname: Lan
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D005290:Ferric Compounds / Q000737:chemistry*; D008027:Light; D008420:Manufactured Materials; D012031:Refractometry / Q000295:instrumentation*; D012542:Scattering, Radiation
chemical_list: D005290:Ferric Compounds; C001215:ferrite