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Design and Characterization of Novel Barium Strontium Titanate Thick Films for Sub-6 GHz RF Applications

Bouça, P. ; Figueiredo, R.J.C. ; wlodarkiewicz, A. ; Tkach, A. ; Matos, J. N. ; Vilarinho, P. V. ; Carvalho, N.B.C.

IEEE Transactions on Microwave Theory and Techniques Vol. 1, Nº 1, pp. 1 - 1, November, 2021.

ISSN (print): 0018-9480
ISSN (online):

Scimago Journal Ranking: 2,01 (in 2021)

Digital Object Identifier: 10.1109/TMTT.2021.3125030

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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 Ba 0.7 Sr 0.3 TiO 3 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.