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A tunable interdigitated capacitor is developed using Ba0.5Sr0.5TiO3 ferroelectic thin film and low-k fused silica substrate for applications in the microwave frequency range. The capacitance and quality factor of tunable IDC structure on BST5 film as a function of frequency up to 5 GHz are extracted using the conformal mapping method and partial capacitance technique. In this paper, the tunable capacitance properties of Au/Ba0.5Sr0.5TiO3 thin-film interdigital capacitors on low-k substrates are presented. [ABSTRACT FROM AUTHOR]

(Zr0.8,Sn0.2)TiO4 (ZST) ceramics were prepared by solid-state reaction method with 1 wt% ZnO and 0.5-1.5 wt% CeO2 or Nd2O3 as sintering aids. The effect of processing parameters and additive concentration on the structure, microstructure and microwave dielectric properties of ZST ceramics were investigated. The dielectric constant (εr) and temperature coefficient of the resonance frequency (τf) were not significantly affected by the addition of these additives. The unloaded quality factors (Qu) were effectively promoted by CeO2 and Nd2O3 additions. εr values of 40 and 38.3, Qxfo values of 57,500 and 59,300 were obtained for the samples sintered with 1.5 and 0.5 wt% of CeO2 and Nd2O3 respectively. The improvement in Qxfo value is primarily attributed to the increase in uniform grain size and density. [ABSTRACT FROM AUTHOR]