GLTRS--Glenn
TITLE AND SUBTITLE:
Influence of the Biasing Scheme on the Performance of Au/SrTiO3/LaAlO3 Thin Film Conductor/Ferroelectric Tunable Ring Resonators

AUTHOR(S):
F.W. Van Keuls, R.R. Romanofsky, D.Y. Bohman, and F.A. Miranda

REPORT DATE:
May 1998

FUNDING NUMBERS:
WU-632-50-5D-00

PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Lewis Research Center
Cleveland, Ohio 44135-3191

PERFORMING ORGANIZATION REPORT NUMBER:
E-11108

SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Washington, DC 20546-0001

REPORT TYPE AND DATES COVERED:
Technical Memorandum

SPONSORING/MONITORING AGENCY REPORT NUMBER:
NASA TM-1998-206641

SUPPLEMENTARY NOTES:
Prepared for the 10th International Symposium on Integrated Ferroelectrics sponsored by the University of Colorado at Colorado Springs, Monterey, California 1-4, 1998. F.W. Van Keuls, National Research Council-NASA Research Associate at Lewis Research Center. R.R. Romanofsky, D.Y. Bohman, and F.A. Miranda, NASA Lewis Research Center. Responsible person, F.W. Van Keuls, organization code 5620, (216) 433-3379.

ABSTRACT:
The performance of gold/SrTiO3/LaAlO3 conductor/ferroelectric/dielectric side-coupled, tunable ring resonators at
K-band frequencies is presented. The tunability of these rings arises from the sensitivity of the relative dielectric constant (er) of SrTiO3 to changes in temperature and dc electric fields (E). We observed that the change in er which takes place by biasing the ring up to 450 V alters the effective dielectric constant (eeff) of the circuit resulting in a 3l resonant frequency shift of nearly 12 % at 77 K. By applying a separate dc bias between the microstrip line and the ring, one can optimize their coupling to obtain bandstop resonators with unloaded quality factors (Qo) as high as 12,000. The 3l resonance was tuned from 15.75 to 17.41 GHz while keeping Qo above 768 over this range. The relevance of these results for practical microwave components will be discussed.


SUBJECT TERMS:
Superconducting films; Ferroelectric films; Tunable components; Ring resonators;
SrTiO3; YBa2Cu3O7-d; LaAlO3

NUMBER OF PAGES:
16

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