JPS6076802A - Leak cable - Google Patents
Leak cableInfo
- Publication number
- JPS6076802A JPS6076802A JP18570783A JP18570783A JPS6076802A JP S6076802 A JPS6076802 A JP S6076802A JP 18570783 A JP18570783 A JP 18570783A JP 18570783 A JP18570783 A JP 18570783A JP S6076802 A JPS6076802 A JP S6076802A
- Authority
- JP
- Japan
- Prior art keywords
- conductor
- leaky
- twisted
- paired
- cable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/20—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/22—Longitudinal slot in boundary wall of waveguide or transmission line
Landscapes
- Waveguide Aerials (AREA)
Abstract
Description
【発明の詳細な説明】 発明の技術分野 本発明は、漏洩ケーブルに関するものである。[Detailed description of the invention] Technical field of invention The present invention relates to leaky cables.
従来技術と問題点
近年、１−ンネルや地下街等電波の届かない地域におい
ても無線通信の必要性が増大してきており、この目的の
ため、漏洩同軸ケーブルや撚り対型漏洩ケーブル等各種
の漏洩ケーブルが開発されてきた。Conventional technology and problems In recent years, the need for wireless communication has increased even in areas where radio waves cannot reach, such as tunnels and underground malls, and for this purpose, various types of leaky cables such as leaky coaxial cables and twisted pair leaky cables are being used. has been developed.
漏洩同軸ケーブルは、同軸ケーブルの外部導体上にケー
ブル軸と所定の角度を持たせつつ所定周期でスロットを
開設した構造となっているが、スロットの形成とスロソ
１−補強のため外部導体に施すラミネート加工の加工費
が高くつくという欠点がある。また、外部導体としてア
ルミニウムを使用する通常の漏洩同軸ケーブルは２合せ
目を半田付けするのが困難なためナイロン糸等で押え巻
きを施している関係上、熱による膨張・収縮や振動等に
より合せ目の接触状態が経年変化して電波の放射特性が
変動するという問題もある。A leaky coaxial cable has a structure in which slots are opened at a predetermined period on the outer conductor of the coaxial cable at a predetermined angle with the cable axis. The drawback is that lamination processing costs are high. In addition, since it is difficult to solder the second seam of ordinary leaky coaxial cables that use aluminum as the outer conductor, they are wrapped with nylon thread, etc., and due to thermal expansion and contraction, vibration, etc. There is also the problem that the radiation characteristics of radio waves fluctuate as the state of contact with the eyes changes over time.
一方、撚り対型漏洩ケーブルは、互いに絶縁された蝮旋
状導体対から構成されるが、漏洩同軸ケーブルのように
ケーブルに沿って伝播する電磁界の大部分を外部導体の
内側に分布させることのできる構造でないため、外界の
影響によって伝送特性が大幅に変動したり、導体表面積
が小さいため同径の漏洩同軸ケーブルに比べて伝送損失
が大きくなるという欠点がある。On the other hand, twisted pair leaky cables consist of a pair of spiral conductors that are insulated from each other, but unlike leaky coaxial cables, most of the electromagnetic field propagating along the cable is distributed inside the outer conductor. Because it does not have a structure that allows for a leaky coaxial cable, it has the disadvantage that its transmission characteristics vary significantly due to the influence of the outside world, and because its conductor surface area is small, its transmission loss is greater than that of a leaky coaxial cable of the same diameter.
他の種類として、同軸ケーブルの外部導体に長手方向の
スリン１−を設け、内部導体に密巻き螺旋状の導体線を
用いた構造のｖｌ旋同軸ケーブルも知られているが、こ
れは、数Ｍｌｌｚ以」二の高い周波数帯での使用が困ｉ
ｔｔであり また内部導体の螺旋ピンチが小さいため加
工時の線速か小さく、加工費が高くなるという欠点があ
る。Another type of VL spiral coaxial cable is known, which has a structure in which the outer conductor of the coaxial cable is provided with a longitudinal line 1-, and the inner conductor is a tightly wound spiral conductor wire. Difficult to use in higher frequency bands than Mllz
tt, and since the helical pinch of the internal conductor is small, the wire speed during processing is low and processing costs are high.
発明の目的
本発明は上述した従来の問題点に鑑みてなされたもので
あり、その目的は、加工費が安く、伝送損失が低くしか
も経年変化の少ない安定な漏洩ケーフ゛ルをＩ是イ共す
ることにある。Purpose of the Invention The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to provide a stable leakage cable with low processing costs, low transmission loss, and little change over time. It is in.
発明の構成 上記目的を達成する本発明の漏洩ケーブルは。Composition of the invention The leaky cable of the present invention achieves the above object.
長手方向に連続したスリットを有する円筒状の外部導体
と互いに絶縁された螺旋状導体対から成るｌ然り対型漏
洩線路とを同軸的に配置するように構成されている。A cylindrical outer conductor having a continuous slit in the longitudinal direction and a pair-type leaky line consisting of a pair of mutually insulated spiral conductors are arranged coaxially.
即ち１本発明は、同軸型漏洩ケーブルの利点を活かしつ
つ、加工費の高い外部導体上のスリ７）の代りに安価な
撚り対型漏洩線路（内部導体）を放射波源として使用す
ることにより、同軸型の利点と撚り対型の利点とを併せ
持たせることにより、上記目的を達成したものである。That is, one aspect of the present invention utilizes the advantages of a coaxial leaky cable while using an inexpensive twisted pair leaky line (inner conductor) as a radiation wave source instead of the expensive pickpocket on the outer conductor 7). The above object has been achieved by combining the advantages of the coaxial type and the twisted pair type.
以下１本発明の更に詳細を実施例によって説明する。The present invention will now be explained in more detail by way of examples.
発明の実施例
第１図は１本発明の一実施例の基本構成を示す斜視図で
ある。１０は長手方向に連続したスリン１へ１１を有す
る円筒状の外部導体、２０は互いに絶縁された螺旋状の
導体対２１．２２から成る撚り対型漏洩線路である。外
ｇ（＜導体１０．！：撚り対型漏洩線路２０とは、互い
に同軸的に配置される。Embodiment of the Invention FIG. 1 is a perspective view showing the basic configuration of an embodiment of the present invention. Reference numeral 10 denotes a cylindrical outer conductor having a longitudinally continuous line 1 to 11, and 20 denotes a twisted pair type leaky line consisting of a pair of spiral conductors 21 and 22 insulated from each other. Outer g(<Conductor 10.!: Twisted pair type leaky line 20 and are arranged coaxially with each other.
外部導体１０は、典型的にはアルミニウムの薄板を９合
せ目を持たせず縦添開き巻きとするごとにより形成され
る。これは、ケーブル断面内に外部導体によるループ回
路が形成されて１然り対型漏洩線路２０で発生した磁束
のうち漏洩波となる前記ループ回路に鎖交する磁束を打
ち消すような電流が外部導体１０に発生ずることを防く
ためである。The outer conductor 10 is typically formed by winding a thin aluminum plate in a vertically aligned manner without having a ninth seam. This is because a loop circuit is formed by the external conductor in the cross section of the cable, and a current that cancels out the magnetic flux generated in the paired leakage line 20 that interlinks with the loop circuit and becomes a leakage wave is generated in the external conductor. This is to prevent this from occurring.
ｌ然り対型漏洩線路２０の撚り合せピッチｐは。The twisting pitch p of the pair-type leaky line 20 is as follows.
通常の撚り対型漏洩ケーブルと同様に１次式を満足する
ように設定される。It is set to satisfy the linear equation like a normal twisted pair leaky cable.
（ｃ、／ｐ） （ν／（１＋ν））＜ ｆ ＜ （ｃ／
ｐ）× 〔ν／ （１−ν）〕
但し、Ｃは光速、νは波長短縮率、ｆは周波数である。(c, /p) (ν/(1+ν)) < f < (c/
p)× [ν/(1−ν)] where C is the speed of light, ν is the wavelength shortening rate, and f is the frequency.
第２図は１本発明の一実施例の具体的構成を示す断面図
であり、第１図と同一の構成要素には同一の参照符号を
付している。１２はポリエチレン等の外被２１３は抗張
力用の鋼撚り線、２３．２４は導体対２１と２２に対す
る外被である。各外被１２．２３及び２４は、低損失の
絶縁性材料から構成されてい名。必要に応して、空隙１
イに低損失絶縁性の介在物を充填してもよい。FIG. 2 is a sectional view showing a specific configuration of an embodiment of the present invention, and the same components as in FIG. 1 are given the same reference numerals. Reference numeral 12 designates an outer sheath 213 made of polyethylene or the like, which is a steel stranded wire for tensile strength, and 23 and 24 an outer sheath for the conductor pair 21 and 22. Each jacket 12, 23 and 24 is constructed from a low loss insulating material. If necessary, open the air gap 1
A may be filled with a low-loss insulating inclusion.
また、好適には、外部導体１０にプチスチソクフィルム
を貼って補強したり、圧かい強度を増すため波付き加工
を施してもよい。Preferably, the outer conductor 10 may be reinforced by pasting a plastic film or may be corrugated to increase pressure strength.
発明の詳細
な説明したように１本発明は５長手方向に連続したスリ
、トを有する円筒状の外部導体と互いに絶縁された螺旋
状導体対から成る撚り対型漏洩線路とを同軸的に配置す
るように構成゛れているので、加工費が安（、伝送損失
が小さくしかも経年変化が少なくて安定な漏洩ケーブル
を提供できる。DETAILED DESCRIPTION OF THE INVENTION As described above, the present invention comprises a cylindrical outer conductor having five longitudinally continuous slits and a twisted pair type leaky line consisting of a pair of mutually insulated spiral conductors, which are coaxially disposed. Since the cable is configured to do so, it is possible to provide a stable leaky cable with low processing costs (low transmission loss and little change over time).
第１図は本発明の一実施例の基本構成を示す斜視図、第
２図は本発明の一実施例の具体的な構成を示す断面図で
ある。
１０・・円筒状の外部導体、１１・・スリット、２０・
・撚り対型漏洩線路、２１．２２・・ｌ然り対、１２，
２３．２４・・外被。
特許出願人 住友電気工業株式会社
代 理 人 弁理士 玉蟲久五部FIG. 1 is a perspective view showing a basic configuration of an embodiment of the present invention, and FIG. 2 is a sectional view showing a specific configuration of an embodiment of the present invention. 10. Cylindrical outer conductor, 11. Slit, 20.
・Twisted pair type leaky line, 21.22...L pair, 12,
23.24... Outer covering. Patent applicant Sumitomo Electric Industries Co., Ltd. Representative Patent attorney Gobe Tamamushi
Claims (1)
導体と、互いに絶縁されたｖＩ旋状導体対から成るｌ然
り対型漏洩線路とを同軸的に配置したことを特徴とする
漏洩ケーブル。A cylindrical outer part 81 having a continuous slit in the longitudinal direction;
A leaky cable characterized in that a conductor and a pair-type leaky line consisting of a pair of vI spiral conductors insulated from each other are coaxially arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18570783A JPS6076802A (en) | 1983-10-03 | 1983-10-03 | Leak cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18570783A JPS6076802A (en) | 1983-10-03 | 1983-10-03 | Leak cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6076802A true JPS6076802A (en) | 1985-05-01 |
Family
ID=16175453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18570783A Pending JPS6076802A (en) | 1983-10-03 | 1983-10-03 | Leak cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6076802A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996018884A1 (en) * | 1994-12-16 | 1996-06-20 | Tokyo Gas Co., Ltd. | Electromagnetic inspection of elements of piping |
-
1983
- 1983-10-03 JP JP18570783A patent/JPS6076802A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996018884A1 (en) * | 1994-12-16 | 1996-06-20 | Tokyo Gas Co., Ltd. | Electromagnetic inspection of elements of piping |
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