EP0694986B1 - Câble coaxial rayonnant - Google Patents
Câble coaxial rayonnant Download PDFInfo
- Publication number
- EP0694986B1 EP0694986B1 EP95810481A EP95810481A EP0694986B1 EP 0694986 B1 EP0694986 B1 EP 0694986B1 EP 95810481 A EP95810481 A EP 95810481A EP 95810481 A EP95810481 A EP 95810481A EP 0694986 B1 EP0694986 B1 EP 0694986B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- windows
- cable
- series
- cable according
- distances
- 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.)
- Expired - Lifetime
Links
Images
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
- H01Q13/203—Leaky coaxial lines
Definitions
- the present invention relates to a radiating coaxial cable for communications mobile, especially in tunnels, this cable comprising a central conductor embedded in a layer of insulating material, this layer being entirely surrounded a sheet of conductive material provided with windows and an insulating sheath protective exterior, said windows being grouped by series.
- radiating cables have the particularity of radiate high frequency energy not in a punctual way like a antenna, but over the entire length of the cable. They consist of a coaxial cable the outer conductive coating of which is provided with openings or windows allowing the passage of the high frequency wave in both directions. In other words, the existence of these windows allows high frequency energy to exit the cable to be received by a mobile receiver. Conversely, the high frequency energy emitted by a mobile transmitter can be picked up by cable through said windows.
- the transmission loss that is to say the attenuation of the signal by cable length unit and, on the other hand, the coupling loss which is the average difference between the signal level in the cable and the received signal level through the antenna.
- the present invention proposes to overcome all of the drawbacks of cables known and provide an efficient and reliable cable, suitable for all kinds environments and whose technical characteristics are only weakly influenced by external parameters specific to the site in which it is placed, and all especially when immersed in water.
- the cable according to the invention characterized in that said windows are grouped by series, and in that the distances between the series of windows are random and all different from each other, these distances being at least a hundred times the spaces between two adjacent windows.
- said windows are arranged at least on a line parallel to the axis of the cable.
- the number of windows of each series are identical and the windows of the same series are regularly spaced.
- the windows all have the same oblong shape and are arranged along axes perpendicular to the longitudinal axis of the cable.
- the height of the windows, in a direction perpendicular to the longitudinal axis of the cable is substantially equal to the space between the axes vertical of two windows of the same series.
- the number of windows in a series can be equal to six.
- the distances between the series of windows are determined by a random number generator.
- the distances are integer multiples which are all different from said spaces.
- the height of the windows is at least equal to the diameter of the layer of insulating material.
- the cable 10 shown is of the coaxial type and has a central conductor 11 embedded in a coaxial layer 12 of an insulating material, this the latter being entirely surrounded by a sheet 13 of a conductive material, in particular a continuous metal sheet bonded to the overlapping edges, the assembly being externally coated with an insulating sheath 14.
- the metal sheet 13 is provided with windows 17. These windows are arranged on a line parallel to the axis of the cable and grouped by series F 1 , F 2 , F 3 ,. .. F i over the entire length of the cable.
- these series of windows are spaced irregularly, that is to say that the distances which separate two consecutive series of windows, namely the distance between the series F i and the series F i + 1 and that between the series F n and the series F n + 1 , are all different from each other, but at least a hundred times greater than the spaces which separate two adjacent windows by being integer multiples of these spaces.
- the windows are produced by determining the successive distances between two series of windows by a random number generator.
- the windows themselves have an oblong shape, for example elliptical (see Figure 2) or rectangular (see Figure 3).
- the most large, i.e. the height of the window is preferably oriented perpendicular to the longitudinal axis of the cable and at least equal to the diameter of the layer of insulating material.
- the number of windows in each series is advantageously six.
- the space 1 between the vertical axes of two neighboring windows of the same series is preferably at least approximately equal to the height of each window.
- the space 1 is approximately equal to the major axis of the ellipse.
- the space 1 is substantially equal to the length of the rectangle.
- the number of windows in each series is equal to six.
- the windows 17 are like previously grouped by series, but the series are arranged on several lines, and in particular two 21, 22 in the variant shown, parallel to the axis of the cable.
- the distance L which separates the two lines 21 and 22 is at least equal to the height 1 of the windows 17 and more particularly in the variant illustrated by this figure substantially equal to twice this height.
- the arrangement of windows 17 on each line 21 and 22 is identical.
- the windows are preferably grouped in sets of six, the distance between each series of windows being random since amplification arranged at the start of the cable. The two reasons that justify this provision are as follows. On the one hand, it makes it possible to avoid points in weakening reflection and on the other hand it allows to guarantee a certain transmission power at the end of the cable while by optimizing the transmission loss factor.
- this cable offers a coupling factor and a very radiated electromagnetic field constant in the range of 30 to 2,000 MHz and, unlike known cables, does not induce discontinuities or irregularities in coupling in this frequency range. It is because of this practically insensitive to the environment and retains all of its characteristics measured in space after installation in a tunnel.
Landscapes
- Waveguide Aerials (AREA)
- Communication Cables (AREA)
- Insulated Conductors (AREA)
Description
Claims (10)
- Câble coaxial rayonnant pour les communications mobiles, notamment dans des tunnels, ce câble comportant un conducteur central (11) enrobé dans une couche d'un matériau isolant (12), cette couche étant entièrement entourée d'une feuille (13) d'un matériau conducteur pourvue de fenêtres et d'une gaine isolante extérieure de protection (14), lesdites fenêtres (17) étant groupées par séries (F1, F2, F3...), caractérisé en ce que les distances (d1, d2, ... dn) entre les séries de fenêtres sont aléatoires et toutes différentes les unes des autres, et en ce qu'elles sont au moins cent fois supérieures aux espaces qui séparent deux fenêtres adjacentes.
- Câble selon la revendication 1, caractérisé en ce que lesdites fenêtres (17) sont disposées selon au moins une ligne parallèle à l'axe du câble.
- Câble selon la revendication 1, caractérisé en ce que le nombre de fenêtres (17) de chaque série est identique.
- Câble selon la revendication 1, caractérisé en ce que les fenêtres d'une même série sont régulièrement espacées.
- Câble selon la revendication 1, caractérisé en ce que les fenêtres (17) ont toutes une même forme oblongue et sont disposées selon des axes perpendiculaires à l'axe longitudinal du câble (10).
- Câble selon la revendication 5, caractérisé en ce que la hauteur des fenêtres, dans une direction perpendiculaire à l'axe longitudinal du câble est sensiblement égale à l'espace (1) qui sépare les axes verticaux de deux fenêtres d'une même série.
- Câble selon la revendication 3, caractérisé en ce que le nombre de fenêtres (17) d'une série est égal à six.
- Câble selon la revendication 1, caractérisé en ce que les distances (d1, d2,... dn) entre les séries de fenêtres sont déterminées par un générateur de nombres aléatoires.
- Câble selon la revendication 1, caractérisé en ce que les distances (d1, d2,... dn) entre les séries de fenêtres sont des multiples entiers qui sont tous différents des espaces qui séparent les fenêtres adjacentes.
- Câble selon la revendication 1, caractérisé en ce que la hauteur des fenêtres est au moins égale au diamètre de la couche de matériau isolant (12).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9409506 | 1994-07-27 | ||
FR9409506 | 1994-07-27 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0694986A1 EP0694986A1 (fr) | 1996-01-31 |
EP0694986B1 true EP0694986B1 (fr) | 2001-08-22 |
Family
ID=9465945
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95810481A Expired - Lifetime EP0694986B1 (fr) | 1994-07-27 | 1995-07-25 | Câble coaxial rayonnant |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0694986B1 (fr) |
AT (1) | ATE204682T1 (fr) |
DE (1) | DE69522278T2 (fr) |
ES (1) | ES2161848T3 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19738381A1 (de) | 1997-09-03 | 1999-03-04 | Alsthom Cge Alcatel | Abstrahlendes koaxiales Hochfrequenz-Kabel |
DE10260070B4 (de) * | 2002-12-19 | 2006-07-13 | Sew-Eurodrive Gmbh & Co. Kg | System mit einem elektrischen Kabel |
CN116168889A (zh) * | 2021-11-25 | 2023-05-26 | 华为技术有限公司 | 漏泄同轴电缆与通信系统 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3691488A (en) * | 1970-09-14 | 1972-09-12 | Andrew Corp | Radiating coaxial cable and method of manufacture thereof |
US4325039A (en) * | 1979-10-31 | 1982-04-13 | Bicc Limited | Leaky coaxial cable wherein aperture spacings decrease along the length of the cable |
GB2236907B (en) * | 1989-09-20 | 1994-04-13 | Beam Company Limited | Travelling-wave feeder type coaxial slot antenna |
DE9318420U1 (de) * | 1993-12-02 | 1994-01-20 | Kabelmetal Electro Gmbh | Abstrahlendes koaxiales Hochfrequenz-Kabel |
-
1995
- 1995-07-25 EP EP95810481A patent/EP0694986B1/fr not_active Expired - Lifetime
- 1995-07-25 DE DE69522278T patent/DE69522278T2/de not_active Expired - Fee Related
- 1995-07-25 AT AT95810481T patent/ATE204682T1/de not_active IP Right Cessation
- 1995-07-25 ES ES95810481T patent/ES2161848T3/es not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ATE204682T1 (de) | 2001-09-15 |
DE69522278T2 (de) | 2002-05-23 |
EP0694986A1 (fr) | 1996-01-31 |
DE69522278D1 (de) | 2001-09-27 |
ES2161848T3 (es) | 2001-12-16 |
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