Synthesis and characterization of BaTiO₃ by coprecipitation method and antenna application microfite patch

Our aim was to synthesize and characterize barium titanate (BaTiO₃) for application in dielectric substrate in microtape patch antennas. The emergence of new wireless technologies results in increasing demands for low-cost antennas that allow the union of different technologies into a single portable device. BaTiO₃ is a ceramic compound with crystalline perovskite structure (ABO₃), which fits the class of electronic ceramics and can be used, in the form of thin film, for the composition of computer RAM components due to reversible spontaneous polarization. The microtape antennas consist of a dielectric substrate where one side is printed a radiant conductor or patch and on the other side, a flat earth. There are several methods to synthesize BaTiO₃, however in this research it was synthesized by coprecipitation, from barium acetate (BaC₄H6O₄), Titanium Dioxide (TiO₂) and Nitric Acid (HNO₃). After synthesis, it was characterized by Xray diffraction with refinement by the Rietveld method, where the tetragonal phase was obtained, in which BaTiO₃ has ferroelectricity, in addition to density measurements (5,698 g/cm³), porosity (5.31 %) and Scanning Electron Microscopy, which found a homogeneous granular distribution with an average crystallite size of 500 nm. In addition, an antenna was simulated in the Ansoft HFSS® for application in the range of 6.5 GHz, and a bandwidth of 240 MHz was obtained. Based on the results, the synthesis method proved to be quite efficient and a favorable antenna for applications in wireless network systems. (author)