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http://dx.doi.org/10.4191/kcers.2019.56.6.01

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)
Publication Information
Journal of the Korean Ceramic Society / v.56, no.6, 2019 , pp. 526-533 More about this Journal
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
Microwave and Millimeter-wave dielectrics; Indialite/cordierite glass ceramics; Surface crystal growth; Volume crystallization; Direct casting glass ceramic substrate;
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