EP1175711B1 - Communication system with radiating cable for ensuring controlled radio coverage of a specific volume - Google Patents

Communication system with radiating cable for ensuring controlled radio coverage of a specific volume Download PDF

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Publication number
EP1175711B1
EP1175711B1 EP00925362A EP00925362A EP1175711B1 EP 1175711 B1 EP1175711 B1 EP 1175711B1 EP 00925362 A EP00925362 A EP 00925362A EP 00925362 A EP00925362 A EP 00925362A EP 1175711 B1 EP1175711 B1 EP 1175711B1
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EP
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Prior art keywords
distance
transceiver
meters
insulated conductor
conductor wires
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German (de)
French (fr)
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EP1175711A1 (en
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Thierry Linossier
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Sagem SA
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Sagem SA
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    • 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

Definitions

  • the present invention relates to a system for radiant cable communication for coverage radio controlled by a determined volume, in particular the interior of an enclosure and its environment immediate.
  • radio communications are becoming additionally used in a vehicle, whether the management of functions controlled from outside the vehicle such as opening or closing doors or starting the vehicle, or acquiring vehicle-specific data such as pressure or tire temperature detected by associated sensors to the wheels, or concerning guidance information cartographic, on traffic density, information tourist ...
  • such a radiating cable which is intended to provide long radio coverage tunnel, is not suitable for use for a communication inside or in the environment immediately of an enclosure such as a motor vehicle.
  • the radial range of radiation is not a criterion important because the environment is confined, and leaks beyond the useful area are of no real consequence.
  • the radial range of radiation is not a criterion important because the environment is confined, and leaks beyond the useful area are of no real consequence.
  • In in addition to adapting a traditional radiating cable to different applications is complicated due to the need to determine a new one for each application pattern of openings of the external tubular conductor.
  • a communication comprising a first transmitter / receiver connected to a communication antenna to ensure communication with a second transmitter / receiver according to a predetermined dynamic
  • the communication antenna comprising at least one section of radiating cable comprising a pair of insulated conductor wires having first ends connected to a load equal to one characteristic impedance of the pair of conducting wires isolated, and second ends connected to a connector itself connected to the first transmitter / receiver, so that the radio communication with a second transmitter / receiver either insured with a coverage rate higher than a first given value up to a given first distance and a coverage rate lower than a second given value beyond a second given distance, characterized in that that the assembly of the pair of insulated conductors is performed in a controlled manner for each application as defined in claims 1 to 3.
  • the radiating cable according to the first mode of implementation comprises two sections of cable generally designated in 1 comprising each a pair of insulated conductors 2 twisted having first ends 3 connected to a load 4 and second ends 5 connected to a connector 6 according to parallel mounting.
  • the two cable sections 1 are identical and are each made from a pair of solid copper conductors having 0.8 mm diameter covered with insulation having a thickness of 0.17 mm in cellular polyethylene having a 40% expansion rate and covered with a skin 0.08 mm thick polyethylene.
  • a stretch of cable comprising a twisted pair made from these insulated conductors has a characteristic impedance of 100 ohms so that by connecting these conductors to a load 4 itself of 100 ohms, the section impedance of cable is kept at 100 ohms regardless of its length.
  • the two sections of cable 1 mounted in parallel therefore have an equivalent impedance of 50 ohms corresponding to the nominal impedance usually required at the input / output of a transmitter / receiver.
  • the drivers insulated 2 are preferably kept assembled by a dielectric tape covered with a thin outer sheath thermoplastic or elastomeric material.
  • the communication antenna thus produced is connected by a coaxial cable 10 to a transmitter / receiver 11 carried by the vehicle and adapted to communicate with a outdoor transmitter / receiver 12.
  • the transmitter / receiver 12 can be a fixed transmitter (transmission of cartographic or traffic data) or a portable transmitter / receiver as shown when the transmitter / receiver 12 is intended to perform functions electromagnetic key.
  • the communication antenna is arranged in a loop attached to the roof or floor of the vehicle.
  • the antenna according to the invention is intended to be used as a key electromagnetic, we want the coverage rate radio assured, i.e. the percentage of frames correctly received by the receiver 12 with respect to the number of frames of communication signals transmitted by the transmitter 11, i.e. greater than 80% until a first distance of around 1 meter and less than 20% beyond a second distance on the order of 3 meters.
  • the coverage rate radio assured, i.e. the percentage of frames correctly received by the receiver 12 with respect to the number of frames of communication signals transmitted by the transmitter 11, i.e. greater than 80% until a first distance of around 1 meter and less than 20% beyond a second distance on the order of 3 meters.
  • a rate of coverage greater than 80% up to a distance of 3 meters, and a coverage rate of less than 20% beyond from a distance of 6 meters preferably a radiating cable according to the helical assembly of the wires insulated conductors with a helix pitch of approximately 35 times the diameter of the insulated conductors.
  • the antenna designated by 14 comprises a single section of radiating cable disposed along a line segment under the vehicle floor to extend in a longitudinal direction of the vehicle between the wheels.
  • the antenna 15 comprises a single section of radiating cable looped under the vehicle roof and directly connected to the first transmitter / receiver 11.
  • the ratio of the pitch of the propellers to diameter of the insulated conductors can be adapted in depending on the desired distances for each of the coverage, the variation of distance being in first approximation proportional to the variation of the pitch.
  • the antenna according to the invention has been described with a single pair of insulated wires, we can provide several pairs in the same sheath according to different assembly methods to obtain a multifunction antenna used for several applications different.

Description

La présente invention concerne un système de communication à câble rayonnant pour assurer une couverture radio contrôlée d'un volume déterminé, notamment de l'intérieur d'une enceinte et de son environnement immédiat.The present invention relates to a system for radiant cable communication for coverage radio controlled by a determined volume, in particular the interior of an enclosure and its environment immediate.

On sait que les communications radio sont de plus en plus utilisées dans un véhicule, qu'il s'agisse de la gestion de fonctions commandées depuis l'extérieur du véhicule telles que l'ouverture ou la fermeture des portes ou la mise en route du véhicule, ou l'acquisition de données propres au véhicule telles que la pression ou la température des pneus détectée par des capteurs associés aux roues, ou concernant des informations de guidage cartographique, sur la densité du trafic, des informations touristiques...We know that radio communications are becoming additionally used in a vehicle, whether the management of functions controlled from outside the vehicle such as opening or closing doors or starting the vehicle, or acquiring vehicle-specific data such as pressure or tire temperature detected by associated sensors to the wheels, or concerning guidance information cartographic, on traffic density, information tourist ...

Dans tous les cas il est nécessaire d'assurer une couverture homogène sur une zone bien définie dans ou autour du véhicule en maítrisant la portée du dispositif rayonnant afin que celui-ci soit adapté à l'application concernée sans interférer avec les véhicules adjacents dans le cas où l'application concernée est propre à un véhicule individuel, par exemple les informations relatives à la température ou à la pression des pneus. Il a été envisagé d'utiliser des antennes radio conventionnelles mais l'obtention d'une couverture homogène nécessite une ingénierie d'installation d'antenne compliquée et dépendante de la structure de chaque véhicule. Pour pallier ces difficultés il a été envisagé d'utiliser un câble rayonnant traditionnel tel que décrit dans le document FR-A-2 690 280, c'est-à-dire des câbles rayonnants comprenant un conducteur central entouré d'une couche isolante elle-même recouverte d'un conducteur tubulaire présentant des ouvertures pour assurer un rayonnement des signaux émis par le conducteur central. Toutefois, un tel câble rayonnant, qui est destiné à assurer une couverture radio d'un long tunnel, n'est pas adapté à l'utilisation pour une communication à l'intérieur ou dans l'environnement immédiat d'une enceinte telle qu'un véhicule automobile. En particulier, dans le câble rayonnant traditionnel, la portée radiale du rayonnement n'est pas un critère important car l'environnement est confiné, et des fuites au-delà de la zone utile sont sans réelle conséquence. En outre l'adaptation d'un câble rayonnant traditionnel à différentes applications est compliquée en raison de la nécessité de déterminer pour chaque application un nouveau motif des ouvertures du conducteur tubulaire externe.In all cases it is necessary to ensure a uniform coverage over a well-defined area in or around the vehicle by controlling the range of the device radiant so that it is adapted to the application concerned without interfering with adjacent vehicles in the case where the application concerned is specific to a vehicle individual, for example information relating to the tire temperature or pressure. It was considered to use conventional radio antennas but obtaining uniform coverage requires complicated antenna installation engineering and dependent on the structure of each vehicle. To palliate these difficulties it was envisaged to use a cable radiant traditional as described in document FR-A-2 690 280, i.e. radiating cables comprising a central conductor surrounded by an insulating layer itself covered with a tubular conductor having openings to radiate signals from the central conductor. However, such a radiating cable, which is intended to provide long radio coverage tunnel, is not suitable for use for a communication inside or in the environment immediately of an enclosure such as a motor vehicle. In particular, in the traditional radiating cable, the radial range of radiation is not a criterion important because the environment is confined, and leaks beyond the useful area are of no real consequence. In in addition to adapting a traditional radiating cable to different applications is complicated due to the need to determine a new one for each application pattern of openings of the external tubular conductor.

Selon l'invention on prévoit un système de communication comprenant un premier émetteur/récepteur connecté à une antenne de communication pour assurer une communication avec un second émetteur/récepteur selon une dynamique prédéterminée, l'antenne de communication comportant au moins un tronçon de câble rayonnant comprenant une paire de fils conducteurs isolés ayant des premières extrémités reliées à une charge égale à une impédance caractéristique de la paire de fils conducteurs isolés, et des secondes extrémités reliées à un connecteur lui-même relié au premier émetteur/récepteur, afin que la communication radio avec un second émetteur/récepteur soit assurée avec un taux de couverture supérieur à une première valeur donnée jusqu'à une première distance donnée et un taux de couverture inférieur à une seconde valeur donnée au-delà d'une seconde distance donnée, caractérisé en ce que l'assemblage de la paire de fils conducteurs isolés est réalisé de façon contrôlée pour chaque application comme défini dans les revendications 1 à 3.According to the invention there is provided a communication comprising a first transmitter / receiver connected to a communication antenna to ensure communication with a second transmitter / receiver according to a predetermined dynamic, the communication antenna comprising at least one section of radiating cable comprising a pair of insulated conductor wires having first ends connected to a load equal to one characteristic impedance of the pair of conducting wires isolated, and second ends connected to a connector itself connected to the first transmitter / receiver, so that the radio communication with a second transmitter / receiver either insured with a coverage rate higher than a first given value up to a given first distance and a coverage rate lower than a second given value beyond a second given distance, characterized in that that the assembly of the pair of insulated conductors is performed in a controlled manner for each application as defined in claims 1 to 3.

Ainsi, par une simple modification de l'assemblage qui peut être aisément réalisée sur une ligne de fabrication, on adapte les caractéristiques de l'antenne de communication aux conditions requises.So, by a simple modification of the assembly which can easily be carried out on a line of manufacturing, we adapt the characteristics of the antenna communication under the required conditions.

Selon un autre aspect de l'invention on prévoit en fonction de chaque application une mise en forme et une disposition particulière de l'antenne de communication.According to another aspect of the invention, provision is made in function of each application a formatting and a special arrangement of the communication antenna.

D'autres caractéristiques et avantages de l'invention apparaítront à la lecture de la description qui suit de modes de mise en oeuvre particuliers non limitatifs de l'antenne de communication selon l'invention en référence aux figures parmi lesquelles :

  • la figure 1 est une vue schématique de dessus d'un véhicule équipé d'une antenne de communication selon l'invention selon un premier mode de mise en oeuvre,
  • la figure 2 est une vue de dessus schématique d'un véhicule selon un deuxième mode de mise en oeuvre de l'invention,
  • la figure 3 est une vue de dessus schématique d'un véhicule selon un troisième mode de mise en oeuvre de l'invention.
Other characteristics and advantages of the invention will appear on reading the following description of particular non-limiting modes of implementation of the communication antenna according to the invention with reference to the figures among which:
  • FIG. 1 is a schematic view from above of a vehicle fitted with a communication antenna according to the invention according to a first embodiment,
  • FIG. 2 is a schematic top view of a vehicle according to a second embodiment of the invention,
  • Figure 3 is a schematic top view of a vehicle according to a third embodiment of the invention.

En référence à la figure 1, le câble rayonnant selon le premier mode de mise en oeuvre comporte deux tronçons de câble généralement désignés en 1 comprenant chacun une paire de fils conducteurs isolés 2 torsadés ayant des premières extrémités 3 reliées à une charge 4 et des secondes extrémités 5 reliées à un connecteur 6 selon un montage en parallèle.Referring to Figure 1, the radiating cable according to the first mode of implementation comprises two sections of cable generally designated in 1 comprising each a pair of insulated conductors 2 twisted having first ends 3 connected to a load 4 and second ends 5 connected to a connector 6 according to parallel mounting.

Dans le mode de réalisation illustré, les deux tronçons de câble 1 sont identiques et sont chacun réalisé à partir d'une paire de conducteurs en cuivre massif ayant un diamètre de 0,8 mm recouvert d'un isolant ayant une épaisseur de 0,17 mm en polyéthylène cellulaire ayant un taux d'expansion de 40 % et recouvert d'une peau en polyéthylène d'une épaisseur de 0,08 mm. Un tronçon de câble comportant une paire torsadée réalisée à partir de ces conducteurs isolés a une impédance caractéristique de 100 ohms de sorte qu'en reliant ces conducteurs à une charge 4 elle-même de 100 ohms, l'impédance du tronçon de câble est maintenue à 100 ohms quelle que soit sa longueur. Les deux tronçons de câble 1 montés en parallèle ont donc une impédance équivalente de 50 ohms correspondant à l'impédance nominale habituellement requise à l'entrée/sortie d'un émetteur/récepteur. Les conducteurs isolés 2 sont de préférence maintenus assemblés par un ruban diélectrique recouvert d'une gaine externe mince en matière thermoplastique ou en élastomère.In the illustrated embodiment, the two cable sections 1 are identical and are each made from a pair of solid copper conductors having 0.8 mm diameter covered with insulation having a thickness of 0.17 mm in cellular polyethylene having a 40% expansion rate and covered with a skin 0.08 mm thick polyethylene. A stretch of cable comprising a twisted pair made from these insulated conductors has a characteristic impedance of 100 ohms so that by connecting these conductors to a load 4 itself of 100 ohms, the section impedance of cable is kept at 100 ohms regardless of its length. The two sections of cable 1 mounted in parallel therefore have an equivalent impedance of 50 ohms corresponding to the nominal impedance usually required at the input / output of a transmitter / receiver. The drivers insulated 2 are preferably kept assembled by a dielectric tape covered with a thin outer sheath thermoplastic or elastomeric material.

L'antenne de communication ainsi réalisée est reliée par un câble coaxial 10 à un émetteur/récepteur 11 porté par le véhicule et adapté à communiquer avec un émetteur/récepteur extérieur 12. Selon les applications, l'émetteur/récepteur 12 peut être un émetteur fixe (transmission de données cartographiques ou de trafic) ou un émetteur/récepteur portable comme représenté lorsque l'émetteur/récepteur 12 est destiné à assurer des fonctions de clé électromagnétique. Dans le premier mode de mise en oeuvre illustré par la figure 1, qui est plus particulièrement destiné à assurer un diagramme de rayonnement homogène autour du véhicule afin de permettre une communication avec un émetteur-récepteur externe au véhicule, l'antenne de communication est disposée selon une boucle fixée au toit ou au plancher du véhicule.The communication antenna thus produced is connected by a coaxial cable 10 to a transmitter / receiver 11 carried by the vehicle and adapted to communicate with a outdoor transmitter / receiver 12. Depending on the applications, the transmitter / receiver 12 can be a fixed transmitter (transmission of cartographic or traffic data) or a portable transmitter / receiver as shown when the transmitter / receiver 12 is intended to perform functions electromagnetic key. In the first mode of implementation work illustrated by figure 1, which is more particularly intended to ensure a diagram of homogeneous radiation around the vehicle to allow communication with an external transceiver at vehicle, the communication antenna is arranged in a loop attached to the roof or floor of the vehicle.

Selon un premier exemple de réalisation l'antenne selon l'invention est destinée à être utilisée comme clé électromagnétique, on souhaite que le taux de couverture radio assuré, c'est-à-dire le pourcentage de trames correctement reçues par le récepteur 12 par rapport au nombre de trames de signaux de communication émises par l'émetteur 11, soit supérieur à 80 % jusqu'à une première distance de l'ordre de 1 mètre et soit inférieur à 20 % au-delà d'une seconde distance de l'ordre de 3 mètres. Pour un système émetteur/récepteur fonctionnant avec une dynamique, c'est-à-dire une différence entre la puissance émise par l'émetteur 11 et le seuil de sensibilité en puissance du récepteur 12, égale à environ 70 dB, on réalise de préférence un assemblage des paires de fils conducteurs isolés selon un montage en hélice, le pas de l'hélice étant égal à environ 17 fois le diamètre des fils isolés.According to a first embodiment of the antenna according to the invention is intended to be used as a key electromagnetic, we want the coverage rate radio assured, i.e. the percentage of frames correctly received by the receiver 12 with respect to the number of frames of communication signals transmitted by the transmitter 11, i.e. greater than 80% until a first distance of around 1 meter and less than 20% beyond a second distance on the order of 3 meters. For a transmitter / receiver system operating with dynamics, that is to say a difference between the power emitted by the transmitter 11 and the power sensitivity threshold of the receiver 12, equal to around 70 dB, preferably an assembly of pairs of conductive wires isolated in a helical arrangement, the pitch of the propeller being equal to approximately 17 times the diameter of the insulated wires.

Selon un autre exemple de réalisation permettant d'obtenir pour une même dynamique des systèmes un taux de couverture supérieur à 80 % jusqu'à une distance de 3 mètres, et un taux de couverture inférieur à 20 % au-delà d'une distance de 6 mètres, on réalise de préférence un câble rayonnant selon l'assemblage en hélice des fils conducteurs isolés avec un pas de l'hélice égal à environ 35 fois le diamètre des conducteurs isolés.According to another exemplary embodiment allowing to obtain for a given system dynamics a rate of coverage greater than 80% up to a distance of 3 meters, and a coverage rate of less than 20% beyond from a distance of 6 meters, preferably a radiating cable according to the helical assembly of the wires insulated conductors with a helix pitch of approximately 35 times the diameter of the insulated conductors.

Pour réaliser dans les mêmes conditions une antenne dans laquelle la première distance est comprise entre 3 et 6 mètres et la seconde distance est comprise entre 6 et 8 mètres, on réalisera de préférence un assemblage de la paire de fils conducteurs isolés en alternant la torsion des fils selon une hélice directe et selon une hélice inverse selon un pas compris entre 17 et 35 fois le diamètre des fils conducteurs isolés, le nombre de tours d'hélices dans un même sens étant compris entre 2 et 15 et la longueur d'inversion entre une hélice directe et une hélice inverse étant comprise entre 0,5 et 4 fois le pas de l'hélice adjacente.To make an antenna under the same conditions in which the first distance is between 3 and 6 meters and the second distance is between 6 and 8 meters, an assembly of the pair of insulated conductors alternating twist wires on a direct helix and on a helix reverse according to a step between 17 and 35 times the diameter of the insulated conductors, the number of turns of propellers in the same direction being between 2 and 15 and the inversion length between a direct propeller and a reverse propeller being between 0.5 and 4 times the pitch of the adjacent propeller.

Selon encore un autre exemple de réalisation permettant d'obtenir les mêmes taux de couverture pour une première distance comprise entre 6 et 8 mètres et une seconde distance comprise entre 8 et 10 mètres, on prévoit un câble rayonnant assemblé en hélice, ou alternativement en hélice directe et en hélice inverse, selon un pas supérieur à 50 fois le diamètre des conducteurs isolés, l'assemblage pouvant aller jusqu'à disposer les conducteurs isolés côte à côte sans torsion.According to yet another exemplary embodiment providing the same coverage rates for a first distance between 6 and 8 meters and a second distance between 8 and 10 meters, we plan a radiating cable assembled in a helix, or alternatively in direct and reverse propeller, in one step greater than 50 times the diameter of the insulated conductors, the assembly being able to go so far as to arrange the conductors isolated side by side without twisting.

Selon un autre mode de mise en oeuvre illustré par la figure 2, plus particulièrement destiné à permettre de recueillir des données émises par des capteurs portés par le véhicule, par exemple des informations relatives à la pression ou à la température des pneus au moyen de capteurs portés par les roues 13 du véhicule, l'antenne désignée en 14 comporte un seul tronçon de câble rayonnant disposé selon un segment de droite sous le plancher du véhicule pour s'étendre selon une direction longitudinale du véhicule entre les roues.According to another embodiment illustrated by Figure 2, more particularly intended to allow collect data emitted by sensors carried by the vehicle, for example information relating to the tire pressure or temperature using sensors carried by the wheels 13 of the vehicle, the antenna designated by 14 comprises a single section of radiating cable disposed along a line segment under the vehicle floor to extend in a longitudinal direction of the vehicle between the wheels.

Selon un troisième mode de mise en oeuvre illustré par la figure 3 l'antenne 15 comporte un seul tronçon de câble rayonnant disposé en boucle sous le toit du véhicule et directement relié au premier émetteur/récepteur 11.According to a third illustrated embodiment in FIG. 3, the antenna 15 comprises a single section of radiating cable looped under the vehicle roof and directly connected to the first transmitter / receiver 11.

Bien entendu, l'invention n'est pas limitée aux modes de réalisation décrits et on peut y apporter des variantes de réalisation sans sortir du cadre de l'invention tel que défini par les revendications.Of course, the invention is not limited to described embodiments and we can make variants without departing from the scope of the invention as defined by the claims.

En particulier, le rapport du pas des hélices au diamètre des conducteurs isolés pourra être adapté en fonction des distances souhaitées pour chacun des taux de couverture, la variation de distance étant en première approximation proportionnelle à la variation du pas.In particular, the ratio of the pitch of the propellers to diameter of the insulated conductors can be adapted in depending on the desired distances for each of the coverage, the variation of distance being in first approximation proportional to the variation of the pitch.

De même on notera que pour un pas d'hélice donné les distances varient en fonction de la dynamique du système, en première approximation selon une puissance de dix dont l'exposant est 1/20ème de la variation de dynamique exprimée en décibels. A partir de cette approximation les valeurs données ci-dessus pourront donc être adaptées en fonction de la dynamique des systèmes à équiper et des taux de couverture requis.Similarly, it will be noted that for a given propeller pitch the distances vary depending on the dynamics of the system, as a first approximation according to a power of ten whose exponent is 1 / 20th of the variation of dynamics expressed in decibels. From this approximation the values given above can therefore be adapted according to the dynamics of the systems to equip and coverage rates required.

Bien que dans le cas d'une antenne de communication sous forme d'un segment de droite celle-ci ait été illustrée selon une disposition longitudinale du véhicule à mi-distance entre les roues selon l'axe de celui-ci, on pourra prévoir de décaler l'antenne par rapport à l'axe du véhicule ou de disposer celle-ci de façon transversale par rapport au véhicule. Although in the case of a communication antenna as a line segment this has been illustrated in a longitudinal arrangement of the vehicle to mid-distance between the wheels along its axis, we may plan to offset the antenna relative to the axis of the vehicle or to arrange it transversely by report to the vehicle.

On pourra également prévoir d'augmenter le rayonnement de l'antenne selon l'invention en provoquant des déséquilibres entre les différents éléments soit par des différences de dimensionnement des fils conducteurs, soit en faisant varier l'épaisseur ou la nature des matériaux isolants.We can also plan to increase the radiation of the antenna according to the invention by causing imbalances between the different elements either by differences in the dimensioning of the conducting wires, either by varying the thickness or the nature of the insulating materials.

Bien que l'antenne selon l'invention ait été décrite avec une seule paire de fils isolés, on peut prévoir dans une même gaine plusieurs paires réalisées selon des modes d'assemblage différents pour obtenir une antenne multifonction utilisée pour plusieurs applications différentes.Although the antenna according to the invention has been described with a single pair of insulated wires, we can provide several pairs in the same sheath according to different assembly methods to obtain a multifunction antenna used for several applications different.

Claims (5)

  1. A communications system comprising a first transceiver (11) connected to a communications antenna for providing communication with a second transceiver (12) over a predetermined dynamic range, the communications antenna comprising at least one segment (1, 14, 15) of radiating cable comprising a pair of insulated conductor wires (2) having first ends connected to a load (4) equal to a characteristic impedance of the pair of insulated conductor wires, and second ends (5) connected to a connector (6) itself connected to the first transceiver (11) so that radio communication with a second transceiver (12) is provided with a coverage ratio greater than a first given value up to a first given distance, and a coverage ratio less than a second given value beyond a second given distance, characterized in that for a dynamic range of about 70 dB, for a first value of the coverage ratio greater than 80% up to a first distance of 1 meter, and for a second value of the coverage ratio less than 20% beyond a second distance of 3 meters, the insulated conductor wires are assembled in a helical configuration having a pitch of about 17 times the diameter of the insulated conductor wires, the first distance, the second distance, and the helical pitch being capable of being modified respectively in correspondence up to a first distance of 3 meters, which corresponds to a second distance of 6 meters, and a pitch of 35 times the diameter of the insulated conductor wires.
  2. A communications system comprising a first transceiver (11) connected to a communications antenna for providing communication with a second transceiver (12) over a predetermined dynamic range, the communications antenna comprising at least one segment (1, 14, 15) of radiating cable comprising a pair of insulated conductor wires (2) having first ends connected to a load (4) equal to a characteristic impedance of the pair of insulated conductor wires, and second ends (5) connected to a connector (6) itself connected to the first transceiver (11) so that radio communication with a second transceiver (12) is provided with a coverage ratio greater than a first given value up to a first given distance, and a coverage ratio less than a second given value beyond a second given distance, characterized in that for a dynamic range of about 70 dB, for a first value of the coverage ratio greater than 80% up to a first distance of 3 meters, and for a second value of the coverage ratio less than 20% beyond a second distance of 6 meters, the insulated conductor wires are assembled in an alternating forward and reverse helical configuration at a pitch of 17 times the diameter of the insulated conductor wires, the number of helical turns in the same direction being two and the length of the reversal between two oppositely-handed helixes being 0.5 times the pitch of the adjacent helix, the first distance, the second distance, and the pitch of the helix, the number of turns in the same direction, and the reversal distance being capable of being modified respectively in correspondence up to a first distance of 6 meters, which corresponds to a second distance of 8 meters, a pitch of 35 times the diameter, a number of turns in the same direction equal to 15, and a reversal distance equal to 4 times the pitch of the helix.
  3. A communications system comprising a first transceiver (11) connected to a communications antenna for providing communication with a second transceiver (12) over a predetermined dynamic range, the communications antenna comprising at least one segment (1, 14, 15) of radiating cable comprising a pair of insulated conductor wires (2) having first ends connected to a load (4) equal to a characteristic impedance of the pair of insulated conductor wires, and second ends (5) connected to a connector (6) itself connected to the first transceiver (11) so that radio communication with a second transceiver (12) is provided with a coverage ratio greater than a first given value up to a first given distance, and a coverage ratio less than a second given value beyond a second given distance, characterized in that for a dynamic range of about 70 dB, for a first value of the coverage ratio greater than 80% up to a first distance of 6 meters, and for a second value of the coverage ratio less than 20% beyond a second distance of 8 meters respectively, the insulated conductor wires are assembled in a helical configuration or in alternating helixes with a pitch greater than 50 times the diameter of the insulated conductors, the first distance and the second distance, being capable of being modified respectively in correspondence up to a first distance of 8 meters and a second distance of 10 meters by varying the pitch proportionately to the variation in distance.
  4. A communications system according to any one of claims 1 to 3, characterized in that the communications antenna is disposed in a loop secured to the roof or the floor of a motor vehicle.
  5. A communications system according to any one of claims 1 to 3, characterized in that the communications antenna is disposed along a straight line segment fixed between the wheels beneath the floor of a motor vehicle.
EP00925362A 1999-05-04 2000-04-28 Communication system with radiating cable for ensuring controlled radio coverage of a specific volume Expired - Lifetime EP1175711B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9905647 1999-05-04
FR9905647A FR2793364A1 (en) 1999-05-04 1999-05-04 RADIANT CABLE COMMUNICATION SYSTEM FOR PROVIDING CONTROLLED RADIO COVERAGE OF A DETERMINED VOLUME
PCT/FR2000/001166 WO2000067344A1 (en) 1999-05-04 2000-04-28 Communication system with radiating cable for ensuring controlled radio coverage of a specific volume

Publications (2)

Publication Number Publication Date
EP1175711A1 EP1175711A1 (en) 2002-01-30
EP1175711B1 true EP1175711B1 (en) 2004-08-04

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EP00925362A Expired - Lifetime EP1175711B1 (en) 1999-05-04 2000-04-28 Communication system with radiating cable for ensuring controlled radio coverage of a specific volume

Country Status (4)

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EP (1) EP1175711B1 (en)
DE (1) DE60012725T2 (en)
FR (1) FR2793364A1 (en)
WO (1) WO2000067344A1 (en)

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Publication number Priority date Publication date Assignee Title
US9041697B2 (en) * 2011-01-28 2015-05-26 Broadcom Corporation Apparatus and method for using an LED for backlighting and ambient light sensing

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2686727B1 (en) * 1992-01-28 1997-01-31 Filotex Sa ELECTRIC CONDUCTOR AND ELECTRIC CABLE CONTAINING SUCH A CONDUCTOR.
FR2690280A1 (en) * 1992-04-15 1993-10-22 Alcatel Cable Coaxial cable antenna for tunnel telecommunications or confined spaces - has coaxial cable with outer slots and second single wire, both enclosed separately by outer figure-eight shaped sleeve
FR2726708B1 (en) * 1994-11-09 1997-01-31 Peugeot DEVICE FOR ADAPTING A LINE INTERFACE OF A STATION CONNECTED TO A MULTIPLEXED INFORMATION TRANSMISSION NETWORK
JP3233861B2 (en) * 1996-10-31 2001-12-04 住友電装株式会社 Insulated conductor pair and induction cable using this insulated conductor pair

Also Published As

Publication number Publication date
DE60012725T2 (en) 2005-08-11
WO2000067344A1 (en) 2000-11-09
FR2793364A1 (en) 2000-11-10
EP1175711A1 (en) 2002-01-30
DE60012725D1 (en) 2004-09-09

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