Microstructure and microwave properties of inkjet printed barium strontium titanate thick-films for tunable microwave devices |
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| Affiliation: | 1. Institute for Applied Materials (IAM), Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany;2. Institute for Microwave Engineering and Photonics (IMP), Technische Universität Darmstadt, Merckstraße 25, 64283 Darmstadt, Germany;1. Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Žižkova 22, Brno, Czech Republic;2. Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, Košice, Slovak Republic;3. Nanoforce Technology Limited, Queen Mary University of London, London E1 4NS, United Kingdom;4. Materials Research Institute, Queen Mary University of London, Mile End Road, London E1 4NS, United Kingdom;1. Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. South China University of Technology, Guangzhou 510640, China;2. Foshan Oceano Ceramics Co. Ltd., Foshan 528138, China;1. Chemistry and chemical engineering institute, Mianyang Normal University, Mianyang 621010, PR China;2. Analysis and testing center, Southwest University of Science and Technology, Mianyang 621010, PR China;1. Energy Trading, University of Petroleum and Energy Studies, Dehradun-248007, India;2. Department of Electronics and Instrumentation, Siksha O Anusandhan Deemed to be University, Bhubaneswar-751030, India;3. Department of Pure and Applied Physics, Guru Ghasidas Viswavidyalaya, Koni- 495001, India;4. Ceramics and Composites Group, Defence Metallurgical Research Laboratory, Hyderabad-500058, India;5. Department of Physics, Siksha O Anusandhan Deemed to be University, Bhubaneswar-751030, India |
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| Abstract: | 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 °C and 1200 °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 °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. |
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| Keywords: | Inkjet printing BST Thick-films Microstructure Microwave properties |
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