New tunable microwave Ba0.6Sr0.4TiO3/MgO phase shifters using interdigital capacitors and slit-inductors

Tae Soon Yun, Hyun Suk Kim, Ki Byoung Kim, Il Doo Kim, Ho Gi Kim, Jong Chul Lee

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

In this paper, we report on the role of slit-inductors in notably improving phase shifting capabilities in Ba0.6Sr0.4TiO3 (BST) tunable phase shifters utilizing interdigital capacitor (IDC) structure. The IDC-based coplanar waveguide (CPW) phase shifter with slit-inductors fabricated on (100) oriented BST films deposited on MgO substrates exhibits a much enhanced phase difference of 35.52°, as compared to that (25.23°) of the IDC-based phase shifter at 12 GHz. The figure of merit (FoM) of the IDC-based phase shifters with slit-inductors shows larger value of 43.60°/dB as a result of improving phase shifting while retaining an appropriate insertion loss compared to that (35.67°/dB) of the IDC-based phase shifter without slit-inductor. This work demonstrates potential use of slit-inductors for producing high-performance CPW based BST tunable elements in microwave circuit.

Original languageEnglish
Pages (from-to)5245-5248
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume46
Issue number8 A
DOIs
StatePublished - 6 Aug 2007

Keywords

  • BaSrTiO (BST)
  • Interdigital capacitor (IDC)
  • Phase shifter
  • Slit-inductor

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