Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Micro/Millimeter-Wave Dielectric Indialite/Cordierite Glass-Ceramics Applied as LTCC and Direct Casting Substrates: Current Status and Prospects

  • Ohsato, Hitoshi (Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu) ;
  • Varghese, Jobin (Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu) ;
  • Vahera, Timo (Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu) ;
  • Kim, Jeong Seog (Department of Material Science and Engineering, Hoseo University) ;
  • Sebastian, Mailadil T. (Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu) ;
  • Jantunen, Heli (Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu) ;
  • Iwata, Makoto (Department of Physical Science and Engineering, Nagoya Institute of Technology)
  • Received : 2019.10.24
  • Accepted : 2019.11.09
  • Published : 2019.11.30
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Abstract

Indialite/cordierite glass-ceramics demonstrate excellent microwave dielectric properties such as a low dielectric constant of 4.7 and an extremely high quality factor Qf of more than 200 × 103 GHz when crystallized at 1300℃/20 h, which are essential criteria for application to 5G/6G mobile communication systems. The glass-ceramics applied to dielectric resonators, low-temperature co-fired ceramic (LTCC) substrates, and direct casting glass substrates are reviewed in this paper. The glass-ceramics are fabricated by the crystallization of glass with cordierite composition melted at 1550℃. The dielectric resonators are composed of crystallized glass pellets made from glass rods cast in a graphite mold. The LTCC substrates are made from indialite glass-ceramic powder crystallized at a low temperature of 1000℃/1 h, and the direct casting glass-ceramic substrates are composed of crystallized glass plates cast on a graphite plate. All these materials exhibit excellent microwave dielectric properties.

Keywords

References

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