Microwave Phase Shifters Using Ferroelectric (Ba,Sr)TiO3 Films

Abstract

The ferroelectric (Ba(0.6)Sr(0.4)TiO3) (BST) films were prepared on (001) MgO single crystals by pulsed laser deposition. Coplanar waveguide (CPW) type phase shifters controlled by external dc bias field were fabricated on BST films using a 2 micrometers thick metal layer to reduce metal loss. Microwave properties of the CPW phase shifter were measured using a HP 85 8510C vector network analyzer from 0.1 - 20 GHz. The fabricated CPW phase shifters (8 mm long) exhibited differential phase angle of 100 at 10 GHz with a dc bias field of less than 80 kV/cm between center and ground conductors. Furthermore, a stable differential phase angle (102 +/- 3.5 deg) was observed from another CPW while changing the power of incident microwave from -10 to +30 dBm. Gap size dependent dielectric constant of the BST film was observed and a simple correction method was suggested in the paper. These results demonstrate the possible application of ferroelectric tunable devices on a high power tunable wireless telecommunication.

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Document Details

Document Type
Technical Report
Publication Date
Apr 03, 2003
Accession Number
ADP013368

Entities

People

  • Eun-kyoung Kim
  • Seok-kil Han
  • Seung-eon Moon
  • Su-jae Lee
  • Won-jeong Kim

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Cartography
  • Conformal Mapping
  • Dielectric Permittivity
  • Dielectric Properties
  • Fabrication
  • Films
  • Frequency
  • Insertion Loss
  • Losses
  • Materials
  • Microwaves
  • Phase Shift
  • Power Amplifiers
  • Pulsed Lasers
  • Single Crystals
  • Technical Information Centers
  • Thin Films

Fields of Study

  • Physics

Readers

  • Electronics Engineering
  • Phased Array Antenna Design.
  • Polymer Science and Engineering.

Technology Areas

  • Directed Energy
  • Directed Energy - Pulsed-Laser Deposition