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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 ,
Troy R. Taylor ,
Padmini Periaswamy ,
James Speck  and
Robert A. York
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
Information
MRS Online Proceedings Library (OPL) , Volume 603: Symposium KK – Materials Issues for Tunable RF & Microwave Devices , 1999 , 37
Copyright
Copyright © Materials Research Society 2000

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