Microwave properties of Ba0.5Sr0.5TiO3 thin film coplanar phase shifters

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作者：
Suherman, P.M. [1 ]
Jackson, T.J. [1 ]
Tse, Y.Y. [1 ]
Jones, I.P. [1 ]
Chakalova, R.I. [1 ]
Lancaster, M.J. [1 ]
Porch, A. [2 ]
机构：
[1] School of Engineering, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom
[2] School of Engineering, Cardiff University, CF24 3AA, United Kingdom
来源：
Journal of Applied Physics | 2006年 / 99卷 / 10期
关键词：
Coplanar waveguide transmission lines have been used to show that the temperature dependent properties of Ba0.5 Sr0.5 Ti O3 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. © 2006 American Institute of Physics;
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