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Microwave Phase Shifters Using Ferroelectric (Ba,Sr)TiO3 Films

Published online by Cambridge University Press:  01 February 2011

Won-Jeong Kim ,
Eun-Kyoung Kim ,
Seung-Eon Moon ,
Seok-Kil Han ,
Su-Jae Lee  and
Kwang-Yong Kang
Won-Jeong Kim
Affiliation:
Basic Research Laboratory, Electronics and Telecommunications Research Institute, Kajung-Dong 161, Taejon, 305-350, Korea
Eun-Kyoung Kim
Affiliation:
Basic Research Laboratory, Electronics and Telecommunications Research Institute, Kajung-Dong 161, Taejon, 305-350, Korea
Seung-Eon Moon
Affiliation:
Basic Research Laboratory, Electronics and Telecommunications Research Institute, Kajung-Dong 161, Taejon, 305-350, Korea
Seok-Kil Han
Affiliation:
Basic Research Laboratory, Electronics and Telecommunications Research Institute, Kajung-Dong 161, Taejon, 305-350, Korea
Su-Jae Lee
Affiliation:
Basic Research Laboratory, Electronics and Telecommunications Research Institute, Kajung-Dong 161, Taejon, 305-350, Korea
Kwang-Yong Kang
Affiliation:
Basic Research Laboratory, Electronics and Telecommunications Research Institute, Kajung-Dong 161, Taejon, 305-350, Korea
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Abstract

The ferroelectric (Ba0.6Sr0.4)TiO3 (BST) films were prepared on (001) MgO single crystals by pulsed laser deposition. Coplanar waveguide (CPW) type phase shifters controlled by external dc bias field were fabricated on BST films using a 2 μm thick metal layer to reduce metal loss. Microwave properties of the CPW phase shifter were measured using a HP 8510C vector network analyzer from 0.1 – 20 GHz. The fabricated CPW phase shifters (8 mm long) exhibited differential phase angle of 100 ° at 10 GHz with a dc bias field of less than 80 kV/cm between center and ground conductors. Furthermore, a stable differential phase angle (102 ± 3.5 o) was observed from another CPW while changing the power of incident microwave from -10 to +30 dBm. Gap size dependent dielectric constant of the BST film was observed and a simple correction method was suggested in the paper. These results demonstrate the possible application of ferroelectric tunable devices on a high power tunable wireless telecommunication.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 720: Symposium H – Materials Issues for Tunable RF and Microwave Devices III , 2002 , H6.6
Copyright
Copyright © Materials Research Society 2002

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References

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