JP2008142467A - 同軸プローブ - Google Patents
同軸プローブ Download PDFInfo
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- JP2008142467A JP2008142467A JP2006335993A JP2006335993A JP2008142467A JP 2008142467 A JP2008142467 A JP 2008142467A JP 2006335993 A JP2006335993 A JP 2006335993A JP 2006335993 A JP2006335993 A JP 2006335993A JP 2008142467 A JP2008142467 A JP 2008142467A
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- 239000000523 sample Substances 0.000 title claims abstract description 62
- 230000005540 biological transmission Effects 0.000 claims abstract description 12
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 6
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Abstract
【解決手段】 内導体2と外導体3との間に誘電体を介在させた同軸プローブにであって、この同軸プローブは第1の誘電体4を有する伝送線路部と、第2の誘電体5を有するプローブ部と、第3の誘電体6を有するインピーダンス整合部とからなる。プローブ部の先端は内導体2から外導体3にかけて円錐形状にして内導体2と第2の誘電体5を露出させた尖端を有し、生体への穿刺が容易な形状とされている。
【選択図】 図1
Description
解析周波数(F) :2.45GHz
内導体2の外径(r) :0.48mm
外導体3の内径 (R) :1.60mm
先端錐状部の高さ(t) :5.2mm
テフロンの比誘電率(εa) :2.1
テフロンの誘電正接(tanδa):1.0E-04
アルミナの比誘電率(εb) :9.7
アルミナの誘電正接(tanδb):1.0E-04
肝臓の比誘電率(εr) :43.0
肝臓の誘電正接(tanδr) :2.85E-01
図2、図3、図4、図5の各々において横軸はL1の寸法を示し、縦軸はL2の寸法を示している。例えば図3においてL1を5、L2を9とすれば、その時の反射係数Γはおよそ0.05(V.S.W.R=1.10)となる。このとき供給される電力に対し、反射される電力はわずか0.3%程度しかなく、大部分の電力が生体に放射吸収されていることを表している。従って電力増幅器は必要以上に大きな電力を供給する必要が無く、増幅レベルの大きい電力増幅器を必要としないため設備を安価に構成できる。
3 外部電極
4 第1の誘電体
5 第2の誘電体
6 第3の誘電体
6a 第3の誘電体の第1の層
6b 第3の誘電体の第2の層
103 外部電極
104 絶縁体
105 中心電極
106 中心導体
107 マーカー部材
Claims (9)
- 外導体と内導体との間に誘電体を介在させた構造を有する同軸プローブ装置であって、前記同軸プローブ装置は、
比誘電率がε1である第1の誘電体を有する伝送線路部と、比誘電率がε2である第2の誘電体を有するプローブ部と、単層又は複数層で構成され平均の比誘電率がε3である第3の誘電体を有するインピーダンス整合部とからなり、
前記それぞれの比誘電率は下記の数1の関係を満たし、
前記伝送線路部と、前記インピーダンス整合部と、前記プローブ部とは、この順で外導体同士と内導体同士がそれぞれ電気的に接合され、かつ、前記第1の誘電体と前記第3の誘電体、および前記第3の誘電体と前記第2の誘電体は隙間無く接合されており、
前記プローブ部は、外部に電力を放射する放射部を有していることを特徴とする同軸プローブ装置。
- 前記放射部は前記プローブ部の一端に形成されており、該放射部は前記内導体から前記外導体にかけて円錐形状にして前記内導体と前記第2の誘電体を露出する尖端であることを特徴とする請求項1に記載の同軸プローブ装置。
- 3つの異なる比誘電率の誘電体が連続する任意の部分において、中間層となる誘電体の比誘電率をεm、両側の誘電体の比誘電率をそれぞれεa、εbとしたとき、εmが下記の数2を満足することを特徴とする請求項1または2に記載の同軸プローブ装置。
- 前記異なる比誘電率の誘電体同士が接合される部分において、
前記誘電体の一方は内導体から前記外導体にかけて円錐状の凸部とされ、他方は該凸部に隙間無く勘合する円錐状の凹部とされていることを特徴とする請求項1から3のいずれか1項に記載の同軸プローブ装置。 - 前記凸部は比誘電率の低い側の誘電体に設けられていることを特徴とする請求項1から4のいずれか1項に記載の同軸プローブ装置。
- 前記第2の誘電体はアルミナであることを特徴とする請求項1から5のいずれか1項に記載の同軸プローブ装置。
- 前記第1の誘電体はポリテトラフルオロエチレンであることを特徴とする請求項1から6のいずれか1項に記載の同軸プローブ装置。
- 前記第2の誘電体はポリフェニレンサルファイドからなることを特徴とする請求項1から7のいずれか1項に記載の同軸プローブ装置。
- 前記伝送線路部は特性インピーダンスが50Ωであることを特徴とする請求項1から8のいずれか1項に記載の同軸プローブ装置。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006335993A JP4618241B2 (ja) | 2006-12-13 | 2006-12-13 | 同軸プローブ装置 |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006335993A JP4618241B2 (ja) | 2006-12-13 | 2006-12-13 | 同軸プローブ装置 |
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| Publication Number | Publication Date |
|---|---|
| JP2008142467A true JP2008142467A (ja) | 2008-06-26 |
| JP4618241B2 JP4618241B2 (ja) | 2011-01-26 |
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