Micro/millimeter-wave dielectric indialite/cordierite glass-ceramics applied as LTCC and direct casting substrates : current status and prospects
Ohsato, Hitoshi; Varghese, Jobin; Vahera, Timo; Kim, Jeong Seog; Sebastian, Mailadil T.; Jantunen, Heli; Iwata, Makoto (2019-11-29)
Ohsato, H., Varghese, J., Vahera, T., Kim, J. S., Sebastian, M. T., Jantunen, H., & Iwata, M. (2019). Micro/Millimeter-Wave Dielectric Indialite/Cordierite Glass-Ceramics Applied as LTCC and Direct Casting Substrates: Current Status and Prospects. Journal of the Korean Ceramic Society, 56(6), 526–533. https://doi.org/10.4191/kcers.2019.56.6.01
© 2019 Korean Ceramic Society. This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
https://creativecommons.org/licenses/by-nc/3.0/
https://urn.fi/URN:NBN:fi-fe202002276627
Tiivistelmä
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°C/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°C. 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°C/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.
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