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Electrically Tunable Phase Shifters With Air-Dielectric Sandwich Structure

Published online by Cambridge University Press:  01 February 2011

Minki Jeong ,
Victor Kazmirenko ,
Yuriy Poplavko ,
Beomjin Kim  and
Sunggi Baik
Minki Jeong
Affiliation:
Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, 790-784, South Korea
Victor Kazmirenko
Affiliation:
Department of Microelectronics, National Technical University of Ukraine, Kiev, 03056, Ukraine
Yuriy Poplavko
Affiliation:
Department of Microelectronics, National Technical University of Ukraine, Kiev, 03056, Ukraine
Beomjin Kim
Affiliation:
Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, 790-784, South Korea
Sunggi Baik
Affiliation:
Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, 790-784, South Korea
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Abstract

Electrically tunable microwave phase shifter was developed by inserting dielectric slab and piezoelectric actuator inside a waveguide. Air-dielectric sandwich structure of dielectric material and thin air gap was placed inside a waveguide, where the thickness of air gap is controlled by the actuator. Small changes in the ratio between the thickness of dielectric material and air gap induce significant changes in the effective dielectric constant of the air-dielectric sandwich structure. Phase shifts of 20∼200 degrees were realized with the dielectric materials such as (Mg, Ca)TiO3 while the thickness of air gap is changed between 0 to 30 μm by piezoelectric control. Since the dielectric ceramics has very small loss (tand ∼ 10-4) and the air gap has practically no loss, the total structure shows low insertion loss.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 720: Symposium H – Materials Issues for Tunable RF and Microwave Devices III , 2002 , H3.12
Copyright
Copyright © Materials Research Society 2002

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