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FERROELECTRICS Compositionally graded ferroelectric multilayers for frequency

Compositionally graded ferroelectric multilayers for frequency
agile tunable devices
C. V. Weiss M. B. Okatan S. P. Alpay
M. W. Cole E. Ngo R. C. Toonen
Received: 23 March 2009 / Accepted: 22 April 2009 / Published online: 8 May 2009
Springer Science+Business Media, LLC 2009
Abstract Recently, there has been significant interest
toward the development of tunable dielectric materials for
voltage-controlled, frequency-agile phase shifters and fil-
ters operating in the microwave regime. The fundamental
challenge in designing materials systems for such tunable
devices is the simultaneous requirement of high dielectric
tunability ([40%) over a large temperature interval
(-10 C to ?90 C) coupled with low dielectric losses
(between 3.0 dB and 4.0 dB in operational bandwidths
ranging from several hundred MHz up to 30 or more GHz).
We show that a high- and temperature-insensitive tunability
can be realized in compositionally graded ferroelectrics and
provide a brief review of the results of experimental and


Source: Alpay, S. Pamir - Department of Materials Science and Engineering, University of Connecticut


Collections: Materials Science