Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Fabrication and Characterization of Tunable Bandpass Filter using BST Thin Films

  • Kim, Il-Doo (Department of Materials Science & Engineering, Korea Advanced Institute of Science and Technology) ;
  • Kim, Duk-Su (Department of Materials Science & Engineering, Korea Advanced Institute of Science and Technology) ;
  • Park, Kyu-Sung (Department of Materials Science & Engineering, Korea Advanced Institute of Science and Technology) ;
  • Kim, Ho-Gi (Department of Materials Science & Engineering, Korea Advanced Institute of Science and Technology)
  • Published : 2002.07.08
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Abstract

In this work, a CPW resonator was designed and fabricated to investigate the basic microwave properties, such as effective dielectric constant, of BST thin films. Their properties were used as basic data to simulate and design CPW tunable bandpass filter. We also report on gold/$Ba_{0.5}Sr_{0.5}TiO_3$(BST) ferroelectric thin film C-band tunable bandpass filters(BPFs) designed and fabricated on magnesium oxide substrates using CPW structure. The 2 pole filter was designed for a center frequency of 5.88 GHz with a bandwidth of 9 %. The BST based CPW filter offers a high sensitivity parameter as well as a low loss parameter. The tuning range for the bandpass filter with CPW structure was determined to be 170 MHz.

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