Premium
Fully Screen‐Printed Tunable Microwave Components Based on Optimized Barium Strontium Titanate Thick Films
Author(s) -
Kohler Christian,
Nikfalazar Mohammad,
Friederich Andreas,
Wiens Alex,
Sazegar Mohsen,
Jakoby Rolf,
Binder Joachim R.
Publication year - 2014
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12276
Subject(s) - materials science , screen printing , fabrication , figure of merit , microwave , phase shift module , strontium , composite number , metal , optoelectronics , copper , composite material , metallurgy , insertion loss , medicine , alternative medicine , physics , pathology , quantum mechanics , nuclear physics
The composite system Ba 0.6 Sr 0.4 TiO 3 –ZnO–B 2 O 3 for thick film preparation has been modified via copper–fluorine codoping of BST to make it suitable for the fabrication of co‐fired metal‐insulator‐metal (MIM) components. Based on the resulting improvement of the thick films, MIM varactors and phase shifters were produced by subsequent screen‐printing of silver and BST pastes as well as co‐firing. Microstructural investigations showed the compatibility of silver and BST with neither chemical reaction nor cracking of the layers. The microwave characterization revealed good results regarding tunability and quality factor of the varactors and high figure of merit of 70°/ dB at 1.72 GHz for the phase shifter.