Microwave phase shifter employing srtio3 ferroelectric varactors

Nonlinear microwave properties of thin SrTiO 3 ferroelectric films at ambient temperatures were investigated. A tunability factor of 1.7 and loss tangent of about 0.01-0.015 were measured at frequencies of 2-10 GHz for SrTiO 3 thin film planar varactors at room temperature. The performance of an X-b...

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Bibliographic Details
Published in:Integrated ferroelectrics 1999-01, Vol.24 (1-4), p.287-295
Main Authors: Kozyrev, A., Ivanov, A., Prudan, A., Soldatenkov, O., Hollmann, E., Loginov, V., Ginley, D., Rivkin, T.
Format: Article
Language:English
Subjects:
ferroelectric varactor
phase shifter
tunable
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Summary:Nonlinear microwave properties of thin SrTiO 3 ferroelectric films at ambient temperatures were investigated. A tunability factor of 1.7 and loss tangent of about 0.01-0.015 were measured at frequencies of 2-10 GHz for SrTiO 3 thin film planar varactors at room temperature. The performance of an X-band microstrip phase shifter employing the SrTiO 3 planar varactors at room temperature is reported. Continuous phase shift in the range of (0-55) deg under bias voltage of 0-400 V at operating frequency band (8.6-9.0) GHz was observed. A figure of merit for the phase shifter is 110 deg/dB and the phase error is smaller than 5 deg. To our knowledge, it is the first demonstration of the microwave application of SrTiO 3 varactors operating as nonlinear elements at room temperature and a record result for figure of merit for ferroelectric phase shifters.
ISSN:1058-4587
1607-8489
DOI:10.1080/10584589908215598