Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 34, Issue 12, Pages 2925-2932Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2014.04.007
Keywords
Inkjet printing; BST; Thick-films; Microstructure; Microwave properties
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Funding
- German Research Foundation (DFG) Research Training Group 1037 Tunable Integrated Components in Microwave Technology and Optics (TICMO)
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Barium strontium titanate (BST) is a promising material for passive tunable microwave devices such as phase shifters, tunable filters or tunable matching networks. This publication covers the preparation of BST thick-films for microwave applications through inkjet printing. A Ba0.6Sr0.4TiO3 ink was prepared, printed on alumina substrates and sintered at temperatures between 1100 degrees C and 1200 degrees C. The microstructure of the thick-films reveals the evolution of grain growth and porosity with increasing sintering temperature. Furthermore, a reaction with the substrate was observed for T <= 1175 degrees C. A maximum tunability of 36% was observed at temperatures right below the onset of the substrate reactions. This process conditions were used for the preparation of a loaded line phase shifter, which successfully shows the capability of the inkjet printing process for future microwave device fabrication. (C) 2014 Elsevier Ltd. All rights reserved.
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