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First Demonstration of a Periodically Loaded Line Phase Shifter Using BST Capacitors

Published online by Cambridge University Press:  10 February 2011

Amit S. Nagra
Affiliation:
ECE Department, University of California, Santa Barbara, CA 93106
Troy R. Taylor
Affiliation:
Materials Department, University of California, Santa Barbara, CA 93106
Padmini Periaswamy
Affiliation:
ECE Department, University of California, Santa Barbara, CA 93106
James Speck
Affiliation:
Materials Department, University of California, Santa Barbara, CA 93106
Robert A. York
Affiliation:
ECE Department, University of California, Santa Barbara, CA 93106
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Abstract

Periodically loaded line phase shifter circuits using voltage tunable BaSrTiO3 (BST) parallel plate capacitors have been demonstrated at X-band. The first such phase shifter circuit was capable of 100° of phase shift with an insertion loss of 7.6 dB at 10 GHz. Subsequently, the monolithic fabrication procedure was refined resulting in an improved phase shifter circuit with 200° of phase shift and an insertion loss of 6.2 dB at 10 GHz. In addition to promising loss performance (32°/dB) at 10 GHz, the circuits reported here have several desirable features such as moderate control voltages (20 V), room temperature operation, and compatibility with monolithic fabrication techniques.

Type
Research Article
Copyright
Copyright © Materials Research Society 2000

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