2012 Fiscal Year Final Research Report
R&D of next generation millimeter-wave dielectrics with low dielectric constant and high Q
| Project/Area Number |
22560673
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | 公益財団法人名古屋産業科学研究所 (2012)
Nagoya Industrial Science Research Institute (2010-2011) |
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Principal Investigator |
OHSATO Hitoshi 公益財団法人名古屋産業科学研究所, その他部局等, 研究員 (20024333)
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| Co-Investigator(Kenkyū-buntansha) |
KAGOMIYA Isao 名古屋工業大学, 工学研究科, 准教授 (40318811)
TSUNOOKA Tsutomu 名古屋工業大学, 工学部, プロジェクト教授 (60512449)
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| Co-Investigator(Renkei-kenkyūsha) |
ANDO Minato 名古屋工業大学, 工学部, プロジェクト教授 (50512456)
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| Project Period (FY) |
2010 – 2012
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| Keywords | ミリ波誘電体高Q / 高品質係数 / 低誘電体損失 / 温特ゼロ / インデイアライト/コーディエライト / 結晶化ガラス / 国際研究者交流 |
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| Research Abstract |
Millimeter-wave dielectrics of glass ceramics are formed from the glass with cordierite composition. Glass ceramics composed by indialite which is a polymorph of cordierite were formed. The glass ceramics with superior properties such as high Qf > 200,000 GHz, low dielectric constant (ε_r) of 4.7, temperature coefficient of resonant frequency (TCf) = -27 ppm/℃. But, the glass ceramics shown an anisotropic feature crystallized from glass surface. Cordierite is well known as low thermal expansion material with minus expansion to c-axis and plus expansion to a-axis. A serious problem of clacks appears at the point met the crystals grew from different glass surface. As large cracks are reduced by slow cooling after sintering, measurement of millimeter-wave properties was possible. But, small clacks affected to the Qf values so as to be random variation. Moreover, rutile powder was added in the glass composition for crystal growth agent so as to crystalize in the volume of grass. Consequently, millimeter-wave dielectrics without the cracks and with good properties were fabricated. The properties are as follows: Qf= 120,000GHz, TCf= 0 ppm/OC, ε_r = 7.
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[Presentation] Microwave Dielectric Ceramics with Rare-Earth (I)2012
Author(s)
Hitoshi OHSATO, Isao KAGOMIYA, Jeong Seog KIM, Chae Il Cheon
Organizer
The 21st Symposium on Dielectric and Advanced Matter Physics & The 13th Workshop on High Dielectric and Ferroelectric Device and Materials
Place of Presentation
Muju, Korea
Year and Date
2012-02-13
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