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FERROELECTRICS Compositionally graded ferroelectric multilayers for frequency
 

Summary: FERROELECTRICS
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