GLTRS--Glenn
TITLE AND SUBTITLE:
A Novel K-Band Tunable Microstrip Bandpass Filter Using a Thin Film HTS/Ferroelectric/Dielectric Multilayer Configuration

AUTHOR(S):
G. Subramanyam, F. Van Keuls, and F.A. Miranda

REPORT DATE:
June 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-11218

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-1998-207940

SUPPLEMENTARY NOTES:
Prepared for the 1998 IEEE MTT-S International Microwave Symposium sponsored by the Institute of Electrical and Electronics Engineers, Baltimore, Maryland, June 7-12, 1998. G. Subramanyam, University of Northern Iowa, 47 ITC Building, Cedar Falls, Iowa 50614 and Summer Faculty Fellow at Lewis Research Center; F. Van Keuls, National Research Council-NASA Research Associate at Lewis Research Center; F.A. Miranda, NASA Lewis Research Center. Responsible person, F.A. Miranda, organization code 5620, (216) 433-6589

ABSTRACT:
We report on YBCO/strontium titanate (STO) thin film K-band tunable bandpass filters on lanthanum aluminate substrates. The 2 pole filters were designed for a center frequency of 19 GHz and 4% bandwidth. Tunability is achieved through the non-linear dc electric field dependence of the relative dielectric constant of STO (erSTO). Center frequency shifts greater than 2 GHz were obtained at a 400V bipolar dc bias at temperatures below 77K, with minimum degradation in the insertion loss of the filters.

SUBJECT TERMS:
HTS thin films; Ferroelectric thin film; YBCO; STO; Filter

NUMBER OF PAGES:
10

PDF AVAILABLE FROM URL:
1998/TM-1998-207940.pdf
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