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Zirconium tin titanate (ZST) for miniaturized high impedance surfaces: Microwave dielectric properties and applications

By: Annino, G.; Lazzeri, A.; Levita, G.; Miceli, V.; Gallone, G.; Monorchio, A.; Cioni, B.; Costa, F.; Genovesi, S.; Manara, G.;

2009 / IEEE / 978-1-4244-3647-7

Description

This item was taken from the IEEE Conference ' Zirconium tin titanate (ZST) for miniaturized high impedance surfaces: Microwave dielectric properties and applications ' A new approach for obtaining metasurfaces realized by employing Frequency Selective Surfaces (FSSs) with small periodicity printed on a new class of high dielectric constant materials is presented. The synergic use of ad-hoc engineered materials and innovative electromagnetic design provides an improvement of the overall device in terms of size reduction and radiative properties. Zr0.8Sn0.2TiO4 (ZST) exhibits a high dielectric constant, low dielectric losses, good thermal stability and good high frequency characteristics. Consequently, it is one of the most promising materials for these specific purposes. In particular, in this work the microstructure and the microwave dielectric properties of Zr0.8 Sn0.2TiO4 (ZST) perovskite with NiO addition, prepared with conventional solid-state route, are investigated. The addition of NiO (0.2 wt.%) as doping can efficiently promote the densification and reduce dielectric losses of ZST ceramics. Estimates of the physical and electric characteristics, with particular attention to losses, will be presented through measurements within different range of frequencies. Up to now, ZST materials have been successfully applied in memory devices, filters in cellular base stations, miniaturization of microwave devices, duplexers and general wireless applications [1].