EP1175711A1 - Systeme de communication a cable rayonnant pour assurer une couverture radio controlee d'un volume determine - Google Patents
Systeme de communication a cable rayonnant pour assurer une couverture radio controlee d'un volume determineInfo
- Publication number
- EP1175711A1 EP1175711A1 EP00925362A EP00925362A EP1175711A1 EP 1175711 A1 EP1175711 A1 EP 1175711A1 EP 00925362 A EP00925362 A EP 00925362A EP 00925362 A EP00925362 A EP 00925362A EP 1175711 A1 EP1175711 A1 EP 1175711A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- meters
- order
- distance
- transmitter
- communication system
- 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.)
- Granted
Links
- 238000004891 communication Methods 0.000 title claims abstract description 29
- 239000004020 conductor Substances 0.000 claims description 21
- 230000005855 radiation Effects 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
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
Definitions
- Radiant cable communication system to ensure controlled radio coverage of a determined volume
- the present invention relates to a radiating cable communication system for ensuring controlled radio coverage of a determined volume, in particular of the interior of an enclosure and its immediate environment.
- radio communications are used more and more in a vehicle, whether it is the management of functions controlled from outside the vehicle such as the opening or closing of the doors or the starting of the vehicle, or the acquisition of vehicle-specific data such as tire pressure or temperature detected by sensors associated with the wheels, or concerning cartographic guidance information, traffic density, tourist information, etc.
- such radiating cable which is intended to provide radio coverage for a long tunnel, is not suitable for use for communication inside or in the immediate environment of an enclosure such as a motor vehicle.
- the radial range of the radiation is not an important criterion because the environment is confined, and leaks beyond the useful area are of no real consequence.
- the adaptation of a traditional radiating cable to different applications is complicated because of the need to determine for each application a new pattern of the openings of the external tubular conductor.
- a communication system comprising a first transmitter / receiver connected to a communication antenna comprising at least one section of cable comprising a pair of insulated conductive wires having first ends connected to a load equal to a characteristic impedance the pair of insulated conductors and second ends connected to a connector, and the assembly of the pair of insulated conductors is carried out in a controlled manner for each application to ensure radio communication with a second transmitter / receiver with a coverage rate greater than a first given value up to a first given distance and a coverage rate less than a second given value beyond a second given distance in relation to a dynamic range between the first transmitter / receiver and the second transmitter / receiver .
- the characteristics of the communication antenna are adapted to the required conditions.
- - Figure 1 is a schematic top view of a vehicle equipped with a communication antenna according to the invention according to a first embodiment
- - Figure 2 is a schematic top view of a vehicle according to a second embodiment of the invention
- FIG. 3 is a schematic top view of a vehicle according to a third embodiment of the invention.
- the radiating cable according to the first embodiment comprises two sections of cable generally designated in 1 each comprising a pair of insulated conductive wires 2 twisted having first ends 3 connected to a load 4 and seconds ends 5 connected to a connector 6 according to a parallel mounting.
- the two sections of cable 1 are identical and are each made from a pair of solid copper conductors having a diameter of 0.8 mm covered with an insulator having a thickness of 0.17 mm in cellular polyethylene having an expansion rate of 40% and covered with a polyethylene skin with a thickness of 0.08 mm.
- a cable section comprising a twisted pair produced 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 impedance of the cable section is maintained 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 insulated conductors 2 are preferably held together by a dielectric tape covered with a thin outer sheath of thermoplastic material or elastomer.
- 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 an external transmitter / receiver 12.
- the transmitter / receiver 12 can be a transmitter fixed
- the communication antenna is arranged according to a loop attached to the roof or floor of the vehicle.
- the rate of radio coverage provided that is to say the percentage of frames correctly received by the receiver 12 by relative to the number of frames of communication signals transmitted by the transmitter 11, either greater than 80% up to a first distance of the order of 1 meter and that is less than 20% beyond a second distance of l 'order of 3 meters.
- a radiating cable is preferably produced according to the helical assembly of the insulated conductor wires with a helix pitch equal to approximately 35 times the diameter of the insulated conductors.
- an antenna in which the first distance is between 3 and 6 meters and the second distance is between 6 and 8 meters it is preferable to assemble the pair of insulated conductive wires by alternating the twist of the wires according to a direct helix and according to a reverse helix at a pitch of between 17 and 35 times the diameter of the insulated conductor wires, the number of helix turns 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.
- a radiating cable is provided assembled in a helix, or alternatively in a helix direct and in reverse helix, at a pitch greater than 50 times the diameter of the insulated conductors, the assembly being able to go so far as to place the insulated conductors side by side without twisting.
- the antenna designated at 14 comprises a single section of radiating cable disposed in a straight line under the floor of the vehicle to extend in a direction longitudinal of the vehicle between the wheels.
- the antenna 15 comprises a single section of radiating cable placed in a loop under the roof of the vehicle and directly connected to the first transmitter / receiver 11.
- the ratio of the pitch of the propellers to the diameter of the insulated conductors could be adapted as a function of the distances desired for each of the coverage rates, the variation in distance being at first approximation proportional to the variation in the pitch.
- the distances vary according to the dynamics of the system, as a first approximation according to a power of ten whose exponent is 1/20 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 be equipped and the required coverage rates.
Landscapes
- Details Of Aerials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9905647 | 1999-05-04 | ||
| FR9905647A FR2793364A1 (fr) | 1999-05-04 | 1999-05-04 | Systeme de communication a cable rayonnant pour assurer une couverture radio controlee d'un volume determine |
| PCT/FR2000/001166 WO2000067344A1 (fr) | 1999-05-04 | 2000-04-28 | Systeme de communication a cable rayonnant pour assurer une couverture radio controlee d'un volume determine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1175711A1 true EP1175711A1 (fr) | 2002-01-30 |
| EP1175711B1 EP1175711B1 (fr) | 2004-08-04 |
Family
ID=9545189
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00925362A Expired - Lifetime EP1175711B1 (fr) | 1999-05-04 | 2000-04-28 | Systeme de communication a cable rayonnant pour assurer une couverture radio controlee d'un volume determine |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1175711B1 (fr) |
| DE (1) | DE60012725T2 (fr) |
| FR (1) | FR2793364A1 (fr) |
| WO (1) | WO2000067344A1 (fr) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102622970A (zh) * | 2011-01-28 | 2012-08-01 | 美国博通公司 | 背光模组及其控制方法 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2686727B1 (fr) * | 1992-01-28 | 1997-01-31 | Filotex Sa | Conducteur electrique et cable electrique contenant un tel conducteur. |
| FR2690280A1 (fr) * | 1992-04-15 | 1993-10-22 | Alcatel Cable | Dispositif rayonnant à large bande passante. |
| FR2726708B1 (fr) * | 1994-11-09 | 1997-01-31 | Peugeot | Dispositif d'adaptation d'une interface de ligne d'une station raccordee a un reseau de transmission d'informations multiplexees |
| JP3233861B2 (ja) * | 1996-10-31 | 2001-12-04 | 住友電装株式会社 | 絶縁導体対及びこの絶縁導体対を用いた誘導ケーブル |
-
1999
- 1999-05-04 FR FR9905647A patent/FR2793364A1/fr active Pending
-
2000
- 2000-04-28 WO PCT/FR2000/001166 patent/WO2000067344A1/fr not_active Ceased
- 2000-04-28 DE DE60012725T patent/DE60012725T2/de not_active Expired - Fee Related
- 2000-04-28 EP EP00925362A patent/EP1175711B1/fr not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| See references of WO0067344A1 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102622970A (zh) * | 2011-01-28 | 2012-08-01 | 美国博通公司 | 背光模组及其控制方法 |
| CN102622970B (zh) * | 2011-01-28 | 2015-03-25 | 美国博通公司 | 背光模组及其控制方法 |
| US9041697B2 (en) | 2011-01-28 | 2015-05-26 | Broadcom Corporation | Apparatus and method for using an LED for backlighting and ambient light sensing |
| US9646544B2 (en) | 2011-01-28 | 2017-05-09 | Avago Technologies General Ip (Singapore) Pte. Ltd. | Apparatus and method for using an LED for backlighting and ambient light sensing |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2000067344A1 (fr) | 2000-11-09 |
| DE60012725D1 (de) | 2004-09-09 |
| EP1175711B1 (fr) | 2004-08-04 |
| DE60012725T2 (de) | 2005-08-11 |
| FR2793364A1 (fr) | 2000-11-10 |
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