Barium Strontium Titanate Thick Films for Tunable Software-Defined Radio Front-Ends


In this paper, the samples preparation, experimental details, and characterization of the Electrophoretic Deposition (EPD) of a thick film Barium Strontium Titanate (BST) capacitor intended for radio-frequency applications are reported. With a bias voltage from 0 V to 20 V, the Ba0:7Sr0:3TiO3 capacitor fabricated demonstrates 49% of tunability. The quality factor and the microwave (MW) loss tangent are calculated from 500 MHz to 5 GHz. Using an one-tone measurement setup, the small signal S-parameters measurements for the BST thick film capacitor are also presented by applying input signals from -20 dBm to 4 dBm. The linearity and loss tangent are analyzed considering a comparison of two different bias voltages, 0 V and 10 V. For the first time, the BST thick films fabricated with EPD are implemented and measured in the MW regime.


Patrícia Bouça, Ricardo Figueiredo, Anna Włódarkiewicz, Alexander Tkach, João Nuno Matos, Paula M. Vilarinho, Nuno Borges de Carvalho

our authors


The work of Patrícia Bouça was supported by the Fundação para a Ciência e Tecnologia (F.C.T.) under Ph.D. Grant 2020.05679.BD. And it is also funded by FCT/MCTES through national funds and when applicable co-funded EU funds under the project UIDB/50008/2020-UIDP/50008/2020.

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