Please use this identifier to cite or link to this item:
http://hdl.handle.net/10773/36017
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) Ceramics Electrophoretic deposition (EPD) Ferroelectrics Metal–insulator– metal (MIM) varactors Nonlinear measurements One-tone measurements Tunable devices Phase-shifter |
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 |
URI: | http://hdl.handle.net/10773/36017 |
DOI: | 10.1109/TMTT.2021.3125030 |
ISSN: | 0018-9480 |
Appears in Collections: | CICECO - Artigos DETI - Artigos DEMaC - Artigos IT - Artigos |
Files in This Item:
File | Description | Size | Format | |
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IEEE-TMTT70(2022)611-Bouca.pdf | 4.24 MB | Adobe PDF |
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