journal article·2017-07

Implementation of Ba 0.6 Sr 0.4 TiO 3 ‐ZnO‐B 2 O 3 based tunable microwave phase shifters in LTCC technology

Christian Kohler, Mohammad Nikfalazar, Andreas Heunisch, Bärbel Schulz, Morten Mikolajek, Torsten Rabe, Rolf Jakoby, Joachim R. Binder

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Abstract

Abstract Tunable dielectric Ba 0.6 Sr 0.4 TiO 3 ‐ZnO‐B 2 O 3 thick‐films were analyzed regarding their integration potential into the LTCC technology. Therefore, tunable loaded line phase shifters based on metal‐insulator‐metal varactors with single‐ and double‐printed BST thick‐films were fabricated and co‐sintered inside a four layer LTCC module. Microstructural and chemical investigations showed a sufficient compatibility and adhesion between the silver, BST composite and LTCC layers and a resulting morphology depending on the processing route. The microwave characterization of the LTCC ‐embedded phase shifters revealed comparable results to phase shifters with the same design on alumina substrates.
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Research context

OpenAlex topics: Microwave Dielectric Ceramics Synthesis · Ferroelectric and Piezoelectric Materials · Electrical and Thermal Properties of Materials

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Affiliations

Institute for Applied Materials (IAM‐KWT) Karlsruhe Institute of Technology Eggenstein‐Leopoldshafen Germany

Institute for Microwave Engineering and Photonics (IMP) Technische Universität Darmstadt Darmstadt Germany

Division Advanced Ceramics Federal Institute for Materials Research and Testing (BAM) Berlin Germany

Funding

Deutsche Forschungsgemeinschaft

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