JP4722950B2 - 配線 - Google Patents
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- JP4722950B2 JP4722950B2 JP2008020869A JP2008020869A JP4722950B2 JP 4722950 B2 JP4722950 B2 JP 4722950B2 JP 2008020869 A JP2008020869 A JP 2008020869A JP 2008020869 A JP2008020869 A JP 2008020869A JP 4722950 B2 JP4722950 B2 JP 4722950B2
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- 239000000463 material Substances 0.000 claims description 42
- 238000000576 coating method Methods 0.000 claims description 9
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- 239000002131 composite material Substances 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 description 38
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- 239000011810 insulating material Substances 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000005672 electromagnetic field Effects 0.000 description 3
- 230000008054 signal transmission Effects 0.000 description 3
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- 239000012212 insulator Substances 0.000 description 2
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- 230000005670 electromagnetic radiation Effects 0.000 description 1
- -1 fluororesin Polymers 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P3/00—Waveguides; Transmission lines of the waveguide type
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- Insulated Conductors (AREA)
Description
しかし、信号伝送線路には直流抵抗(R0)や誘電損失(G0)が存在するため、伝送中の信号は減衰する。特にギガヘルツ帯の高周波信号を伝送する場合には、直流抵抗と誘電損失を合成した特性インピーダンス(Z0)は周波数特性を持つため、信号は大きく減衰する。
また、高周波信号の伝送線路において電磁波伝送状態を精査すると、エバーネッセント波(Evanescent Wave)としてサイドローブ的な電磁放射が認められ、100m以上の線路になると、このエバーネッセント波による信号の減衰は直流抵抗や誘電損失による減衰と同程度となる。
さらに、信号を伝送する場合、当該信号伝送線路に外部からの電磁波が混入するクロストークが存在する。
また、特許文献2は、伝送線路をシールドすることにより、エバーネッセント波による信号の減衰を防ぐ技術を開示している。
ギガヘルツ帯の信号を伝送する配線であって、
互いに撚り合わされた一対の心線と、
各前記心線を被覆する一対の第1の絶縁性被覆材と、
前記一対の第1の絶縁性被覆材を被覆する第2の絶縁性被覆材と、
前記第2の絶縁性被覆材を覆い、前記一対の心線から放射されるエバーネッセント波を封じ込めるシールド材と、を備え、
前記一対の心線は、この配線の特性インピーダンスを100Ωから200Ωとし、かつ、前記一対の心線から放射されるTEM(Transverse Electro-Magnetic)波とエバーネッセント波との位相を整合させる、撚り合わせ回数と、直径と、間隔とを有する、
ことを特徴とする。
前記配線を複数備えることを特徴とする。
なお、ツイストペアケーブル10の長さが100m程度の場合には、心線のピッチD2は10.3mm±0.4mmとすることが好ましく、また、200m以上の場合には、10.3mm±0.2mmとすることが好ましい。
一方、TEM波の進行方向に対して立体角45度で中空に放射されたエバーネッセント波は、シールド効果によって45度反射を繰り返しながら進行する。
一方、エバーネッセント波はTEM波と位相が整合するか否かにより、受信端での波形は変化する。TEM波が受信端に到達する時刻をT1とし、伝送線路の出発端で発生した最も到達の遅いエバーネッセント波が受信端に到達する時刻をT2maxとし、エバーネッセント波の受信端での電圧をV2とする。エバーネッセント波の累積電圧は、V2/(T2max−T1)となる。従って、T2maxが次の入力波形(入力信号)の立ち下がりのタイミング以降となると、エバーネッセント波は雑音源となる。
合成波は、TEM波とエバーネッセント波との合成であるため、エバーネッセント波の減衰が少ない場合には、合成波の減衰も少なくなる。
L=L0(1+(1/D2)×π×D3) (1)
ただし、長さの単位はm(メートル)とする。
つまり、ギガヘルツ帯の高周波信号を伝送する場合には、100ps程度以内のスキューが問題となるため、通常のツイストペアケーブルではエバーネッセント波がノイズとなる。
また、TEM波とエバーネッセント波の実効長が一致するため、伝送時間も一致する。従って、本実施形態のツイストペアケーブル10では、エバーネッセント波がノイズとなることはない。
11 心線
12 第1の被覆材
13 第2の被覆材
14 シールド材
15 外皮材
Claims (4)
- ギガヘルツ帯の信号を伝送する配線であって、
互いに撚り合わされた一対の心線と、
各前記心線を被覆する一対の第1の絶縁性被覆材と、
前記一対の第1の絶縁性被覆材を被覆する第2の絶縁性被覆材と、
前記第2の絶縁性被覆材を覆い、前記一対の心線から放射されるエバーネッセント波を封じ込めるシールド材と、を備え、
前記一対の心線は、この配線の特性インピーダンスを100Ωから200Ωとし、かつ、前記一対の心線から放射されるTEM(Transverse Electro-Magnetic)波とエバーネッセント波との位相を整合させる、撚り合わせ回数と、直径と、間隔とを有する、
ことを特徴とする配線。 - 前記心線の撚り合わせ回数は、前記TEM波の実効長が前記一対の心線の線路長の√2倍となるように設定されている、
ことを特徴とする請求項1に記載の配線。 - 前記心線の撚り合わせピッチが10.3mmである、
ことを特徴とする請求項1又は2に記載の配線。 - 請求項1乃至3のいずれか1項に記載の配線を複数備えることを特徴とする複合配線。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008020869A JP4722950B2 (ja) | 2008-01-31 | 2008-01-31 | 配線 |
PCT/JP2009/051729 WO2009096582A1 (ja) | 2008-01-31 | 2009-02-02 | 配線、及び、複合配線 |
US12/865,555 US20110042120A1 (en) | 2008-01-31 | 2009-02-02 | Wiring and composite wiring |
CN200980103717.6A CN101952905B (zh) | 2008-01-31 | 2009-02-02 | 布线以及复合布线 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008020869A JP4722950B2 (ja) | 2008-01-31 | 2008-01-31 | 配線 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2009181855A JP2009181855A (ja) | 2009-08-13 |
JP4722950B2 true JP4722950B2 (ja) | 2011-07-13 |
Family
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Family Applications (1)
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JP2008020869A Active JP4722950B2 (ja) | 2008-01-31 | 2008-01-31 | 配線 |
Country Status (4)
Country | Link |
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US (1) | US20110042120A1 (ja) |
JP (1) | JP4722950B2 (ja) |
CN (1) | CN101952905B (ja) |
WO (1) | WO2009096582A1 (ja) |
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JP2007280666A (ja) * | 2006-04-04 | 2007-10-25 | Nissei Electric Co Ltd | 高速信号伝送用ハーネス |
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JP2009181855A (ja) | 2009-08-13 |
US20110042120A1 (en) | 2011-02-24 |
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