Dielectric tunable properties of low dielectric constant Ba_(0.5)Sr_(0.5)TiO_3-Mg_2TiO_4 microwave composite ceramics

摘要

Ba_(0.5)Sr_(0.5)TiO_3-Mg_2TiO_4 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 Mg_2TiO_4 from 50% to 80% weight ratio and the tunability is 10.8% measured at 10 kHz for the 80% Mg_2TiO_4 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.