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R&D of next generation millimeter-wave dielectrics with low dielectric constant and high Q

右

基本信息

批准号：
22560673
负责人：
OHSATO Hitoshi
金额：
$ 2.91万
依托单位：
公益財団法人名古屋産業科学研究所 (2012)Nagoya Industrial Science Research Institute (2010-2011)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2010
资助国家：
日本
起止时间：
2010 至 2012
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22560673/
关键词：
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ミリ波誘電体高Q　高品質係数インディアライト/コーディエライト誘電体マイクロ波・ミリ波誘電体結晶化ガラスセラミックスコーディエライトインディアライトオーダリングリートベルト解析

项目摘要

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.

微晶玻璃的毫米波介电材料是由含有堇青石成分的玻璃形成的。形成了由堇青石的多晶型英辉石组成的微晶玻璃。该微晶玻璃具有高QF&GT；200,000 GHz，低介电常数(ε_r)=4.7，谐振频率温度系数(Tcf)=-27ppm/℃等优异性能。但是，微晶玻璃呈现出由玻璃表面晶化而来的各向异性特征。堇青石是众所周知的低热膨胀材料，向c轴负膨胀，向a轴正膨胀。在不同玻璃表面结晶生长的结合点上出现了严重的粘结问题。由于烧结后通过缓慢冷却减少了大裂纹，因此毫米波性能的测量成为可能。但是，小波纹对QF值的影响是随机变化的。此外，在玻璃成分中加入金红石粉作为晶体生长剂，使其结晶成草的体积。从而制得了性能良好、无裂纹的毫米波介质材料。其性能如下：Qf=120,000 GHz，Tcf=0ppm/oC，ε_r=7。