JP2005120208A - 可変機能デバイス - Google Patents
可変機能デバイス Download PDFInfo
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- JP2005120208A JP2005120208A JP2003356262A JP2003356262A JP2005120208A JP 2005120208 A JP2005120208 A JP 2005120208A JP 2003356262 A JP2003356262 A JP 2003356262A JP 2003356262 A JP2003356262 A JP 2003356262A JP 2005120208 A JP2005120208 A JP 2005120208A
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- C09K19/3441—Non-steroidal liquid crystal compounds containing at least one heterocyclic ring having nitrogen as hetero atom
- C09K19/345—Non-steroidal liquid crystal compounds containing at least one heterocyclic ring having nitrogen as hetero atom the heterocyclic ring being a six-membered aromatic ring containing two nitrogen atoms
- C09K19/3458—Uncondensed pyrimidines
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- C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
- C09K19/10—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings
- C09K19/14—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings linked by a carbon chain
- C09K19/18—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings linked by a carbon chain the chain containing carbon-to-carbon triple bonds, e.g. tolans
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- C09K19/30—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing saturated or unsaturated non-aromatic rings, e.g. cyclohexane rings
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- C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
- C09K19/30—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing saturated or unsaturated non-aromatic rings, e.g. cyclohexane rings
- C09K19/3001—Cyclohexane rings
- C09K19/3066—Cyclohexane rings in which the rings are linked by a chain containing carbon and oxygen atoms, e.g. esters or ethers
- C09K19/3068—Cyclohexane rings in which the rings are linked by a chain containing carbon and oxygen atoms, e.g. esters or ethers chain containing -COO- or -OCO- groups
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- C09K19/32—Non-steroidal liquid crystal compounds containing condensed ring systems, i.e. fused, bridged or spiro ring systems
- C09K19/322—Compounds containing a naphthalene ring or a completely or partially hydrogenated naphthalene ring
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- C09K19/3444—Non-steroidal liquid crystal compounds containing at least one heterocyclic ring having nitrogen as hetero atom the heterocyclic ring being a six-membered aromatic ring containing one nitrogen atom, e.g. pyridine
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- C09K19/345—Non-steroidal liquid crystal compounds containing at least one heterocyclic ring having nitrogen as hetero atom the heterocyclic ring being a six-membered aromatic ring containing two nitrogen atoms
- C09K19/3452—Pyrazine
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- C09K19/345—Non-steroidal liquid crystal compounds containing at least one heterocyclic ring having nitrogen as hetero atom the heterocyclic ring being a six-membered aromatic ring containing two nitrogen atoms
- C09K19/3455—Pyridazine
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- C09K19/18—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings linked by a carbon chain the chain containing carbon-to-carbon triple bonds, e.g. tolans
- C09K2019/183—Ph-Ph-C≡C-Ph
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- C09K2219/00—Aspects relating to the form of the liquid crystal [LC] material, or by the technical area in which LC material are used
- C09K2219/11—Aspects relating to the form of the liquid crystal [LC] material, or by the technical area in which LC material are used used in the High Frequency technical field
Abstract
Description
が特に好ましい。
液晶組成物の複屈折率Δnは、波長589nmにおいて、0.18以上であることが好ましく、0.25以上であることが更に好ましく、より大きくすることでより大きな移相変換を可能とすることができる。また、液晶組成物の誘電率異方性Δεが、マイクロ波帯域において、0.50以上であることが好ましい。液晶分子長軸方向の誘電損失は0.02以下であることが好ましく、0.016以下であることがより好ましく、液晶分子短軸方向の誘電損失は0.035以下であることが好ましい。
又、マイクロ波帯可変位相器をビーム走査型のアンテナとして応用することもできる。
実施例中、測定した特性は以下の通りである。
TN-I :ネマチック相−等方性液体相転移温度(℃)
Δε :誘電異方性(25℃及びXバンド)
Δn :複屈折(20℃及び589nm)
Vth :しきい値電圧(V)(25℃)
水平成分のtanδ :液晶分子長軸方向の誘電損失(25℃及びXバンド)
垂直成分のtanδ :液晶分子短軸方向の誘電損失(25℃及びXバンド)
(実施例1)
次に示す液晶組成物を作成し、諸特性を測定した。
Δε :0.63
Δn :0.303
Vth :1.81V
水平成分のtanδ :0.014
垂直成分のtanδ :0.030
当該液晶組成物は、高いネマチック相-等方性液体相転移温度(TN-I)、大きな誘電率異方性Δεに対し比較的小さなtanδを有する。
比較例として、次に示す液晶組成物を作成し、諸特性を測定した。
Δε :0.40
Δn :0.225
Vth :1.60V
水平成分のtanδ :0.022
垂直成分のtanδ :0.038
比較例に記載の液晶組成物は、実施例1記載の液晶組成物に較べネマチック相-等方性液体相転移温度(TN-I)が低く、誘電率異方性Δεが小さい割にはtanδが大きい。
2・・・液晶層
3・・・導体線路(金属ライン)
4・・・配向膜
5・・・グランド面(金属膜)
Claims (4)
- 高周波線路を構成する導体線路とグランド導体との間に液晶層を配置してなる可変機能デバイスにおいて、該液晶層が一般式(1)
- 一般式(1)においてnが1を表す請求項1記載の可変機能デバイス。
- 液晶層の複屈折率Δnが、波長589nmにおいて、0.18以上である請求項1又は2記載の可変機能デバイス。
- 液晶層の誘電率異方性Δεが、マイクロ波帯域において、0.50以上である請求項1、2又は3記載の可変機能デバイス。
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JP2003356262A JP2005120208A (ja) | 2003-10-16 | 2003-10-16 | 可変機能デバイス |
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Cited By (56)
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WO2011042699A1 (en) | 2009-10-09 | 2011-04-14 | Cambridge Enterprise Limited | Rf element |
WO2011047781A1 (de) | 2009-10-24 | 2011-04-28 | Merck Patent Gmbh | Verbindungen für ein flüssigkristallines medium und verwendung für hochfrequenzbauteile |
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