Dielectric tunable properties of low dielectric constant Ba0.5Sr0.5TiO3-Mg2TiO4 microwave composite ceramics

Ba0.5Sr0.5TiO3-Mg2TiO4 composite ceramics are fabricated via the conventional solid-state reaction method. The microstructures, dielectric tunability, and microwave properties of composite ceramics are investigated. The dielectric constant is tailored from 335 to 35 by manipulating the addition of Mg2TiO4 from 50% to 80% weight ratio and the tunability is 10.8% measured at 10 kHz for the 80% Mg2TiO4 addition. The composite ceramics with high Q value (> 200) at L band are useful for potential tunable microwave device applications in the wireless communication system.