Microwave properties of Ba 0.5 Sr 0.5 Ti O 3 thin film coplanar phase shifters

Coplanar waveguide transmission lines have been used to show that the temperature dependent properties of Ba 0.5 Sr 0.5 Ti O 3 thin films used for microwave phase shifters in the frequency range 45 MHz - 50 GHz are correlated strongly with the microstructure of the films. The highest tunability and...

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Published inJournal of applied physics Vol. 99; no. 10; pp. 104101 - 104101-7
Main Authors Suherman, P. M., Jackson, T. J., Tse, Y. Y., Jones, I. P., Chakalova, R. I., Lancaster, M. J., Porch, A.
Format Journal Article
Published American Institute of Physics 23.05.2006
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Summary:Coplanar waveguide transmission lines have been used to show that the temperature dependent properties of Ba 0.5 Sr 0.5 Ti O 3 thin films used for microwave phase shifters in the frequency range 45 MHz - 50 GHz are correlated strongly with the microstructure of the films. The highest tunability and figure of merit of the phase shifters were obtained for films with the narrowest ferroelectric-paraelectric phase transition range, lowest mosaic spread, and widest columnar microstructure. The study also showed that the operating temperature plays an important role in achieving the optimum phase shift for microwave applications.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.2198933