Tunable double resonance with negative permittivity and permeability in GdFeO3 material by sintering temperature

Abstract

In this paper, double negative performance of GdFeO3 in GHz range was investigated. Double negative performance generally occurs in ceramic/metal composites or artificial metamaterials. Therefore, this behavior of single phase ABO3 perovskites is very interesting. Conventional solid phase method was used for synthesis of GdFeO3 ceramics. Double negative performance of GdFeO3 occurred, with negative permeability at 2.6–2.8 GHz and negative permittivity at 0.9–1.4 GHz. The reason for the resonance was also analyzed. Furthermore, resonance frequency could be easily adjusted by varying sintering temperature. Results showed that GdFeO3 can be applied in new field of metamaterials for antennas. By placing a double negative metamaterial lens in front of antenna source, the gain and directivity of the antenna can be increased. The material can be placed in front of antenna source as a zero-refractive metamaterial lens. Therefore, it is necessary to study the properties of metamaterials based on GdFeO3.