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Title: Design and Characterization of Novel Barium Strontium Titanate Thick Films for Sub-6 GHz RF Applications
Author: Bouca, Patricia
Figueiredo, Ricardo
Wlodarkiewicz, Anna
Tkach, Alexander
Matos, Joao Nuno
Vilarinho, Paula M.
de Carvalho, Nuno Borges
Keywords: Barium strontium titanate (BST)
Electrophoretic deposition (EPD)
Metal–insulator– metal (MIM) varactors
Nonlinear measurements
One-tone measurements
Tunable devices
Issue Date: 2022
Publisher: IEEE
Abstract: In this article, a novel study of the design and characterization of barium strontium titanate (BST) thick films produced by electrophoretic deposition (EPD) on flexible platinum foils is reported. Intended for sub-6 GHz radio frequency (RF) applications, a study on film and electrode thickness is conducted. First, a comparison of tunability and quality factor between different film thicknesses regarding frequency is performed. The Ba0.7Sr0.3TiO3 varactors demonstrate variable capacitance between 49% and 55% for frequencies from 500 MHz to 5 GHz. Afterward, the influence of electrode thickness on the capacitance and quality factor of the films are studied. The variable capacitance and the quality factor present a tradeoff regarding the parametric studies of film and electrode thicknesses. Lastly, a microstrip line is deposited over the BST thick film to simulate and measure the phase-shifting capabilities of the device. Using a one-tone measurement setup, the small-signal S-parameter measurements of the phase shifter are also presented, and the linearity is analyzed considering two different bias voltages, 0 and 10 V. For the first time, the BST thick films fabricated by EPD process are implemented and measured in the RF regime as a metal–insulator–metal capacitor and as a phase shifter circuit.
Peer review: yes
DOI: 10.1109/TMTT.2021.3125030
ISSN: 0018-9480
Appears in Collections:CICECO - Artigos
DETI - Artigos
DEMaC - Artigos
IT - Artigos

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