Tunable Microwave Phase Shifters Using LTCC Technology with Integrated BST Thick Films

Low temperature co‐fired ceramic (LTCC) reflection and delay line type microwave phase shifters utilizing completely integrated barium strontium titanate (BST) varactors are investigated. Dielectric properties of the screen printed BST paste in 1–8 GHz frequency range are presented. Sintering temper...

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Bibliographic Details
Published in:International journal of applied ceramic technology 2012-01, Vol.9 (1), p.11-17
Main Authors: Palukuru, Vamsi Krishna, Peräntie, Jani, Jäntti, Jyri, Jantunen, Heli
Format: Article
Language:English
Subjects:
Barium strontium titanates
Ceramics
Delay lines
Dielectric properties
Microwaves
Phase shifters
Reflection
Sintering
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Summary:Low temperature co‐fired ceramic (LTCC) reflection and delay line type microwave phase shifters utilizing completely integrated barium strontium titanate (BST) varactors are investigated. Dielectric properties of the screen printed BST paste in 1–8 GHz frequency range are presented. Sintering temperature and time were varied and their effect on the dielectric properties of the film was studied. Phase shifters were sintered at 875°C for 25 min in line with a standard LTCC sintering profile. The relative phase shift of the reflection and delay line type phase shifters were found to be 5 and 11.5° at 2.5 GHz with applied bias field strength of 8 V/μm, respectively.
ISSN:1546-542X
1744-7402
DOI:10.1111/j.1744-7402.2011.00706.x