WO2011006769A1 - Antenna system including an active element and a coaxial cable with limited stripping - Google Patents

Antenna system including an active element and a coaxial cable with limited stripping Download PDF

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Publication number
WO2011006769A1
WO2011006769A1 PCT/EP2010/059410 EP2010059410W WO2011006769A1 WO 2011006769 A1 WO2011006769 A1 WO 2011006769A1 EP 2010059410 W EP2010059410 W EP 2010059410W WO 2011006769 A1 WO2011006769 A1 WO 2011006769A1
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WO
WIPO (PCT)
Prior art keywords
active strand
coaxial cable
antenna system
point
vehicle
Prior art date
Application number
PCT/EP2010/059410
Other languages
French (fr)
Inventor
José Robineau
Rachid Machroul
Fabienne Masson
Original Assignee
Valeo Securite Habitacle
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Valeo Securite Habitacle filed Critical Valeo Securite Habitacle
Publication of WO2011006769A1 publication Critical patent/WO2011006769A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • H01Q1/325—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle
    • H01Q1/3283—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle side-mounted antennas, e.g. bumper-mounted, door-mounted
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H01Q1/2216—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in interrogator/reader equipment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H01Q1/2241—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in or for vehicle tyres
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0421—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with a shorting wall or a shorting pin at one end of the element

Definitions

  • Antenna system comprising an active strand and a
  • the invention relates to antennas used in motor vehicles for receiving signals emitted locally at the level of the tires of the vehicle, which signals convey information relating to the level of inflation of the tire.
  • TPMS Tire Pressure Measuring Systems in English
  • TPMS tire pressure measuring system in French
  • a TPMS system typically consists of four valves located on the vehicle wheels, each of which includes a radio frequency transmitter and a low frequency receiver, and a battery.
  • the valve is typically but not exclusively interrogated by a low frequency signal for diagnostic purposes, and responds with a radio frequency signal to transmit a pressure value or a simple insufficient pressure warning.
  • a TPMS system further comprises a receiver of the signals emitted by the valves, which receiver can perform several functions combined with the reception of such signals.
  • the TPMS receiver can, depending on the case, also perform the reception of door opening signals emitted by a remote remote control. This would be the case of a TPMS receiver that does not have a TPMS valve interrogation function.
  • the TPMS receiver can also perform the door opening signal receiver function emitted by a remote control as well as the immobilizer function of the vehicle, i.e. the function of producing an operation blocking control signal. of the vehicle engine.
  • the TPMS receiver can also perform a vehicle access interrogation function and start-up type hands-free, and / or steering column lock, or more generally the main controller of the vehicle - body controller in English - realizing various vehicle accessory power controls.
  • the system has a radio frequency antenna, located near a central processing unit of the signal in reception or remote from this central unit.
  • the antenna can in particular be integrated in this central unit.
  • the system may or may not have a function of identification of the wheel concerned by the lack of pressure. This function is typically called autolocation function or "autoloc".
  • This "autoloc" function can be implemented via the WAL- Wireless Autolocation- technology, which is based on the difference in signal strength between the signals coming from the rear and the front of the vehicle.
  • the location of the antenna should not be in the center of the vehicle, and it may even be necessary to place the antenna away from the treatment unit and thus place the antenna on the antenna. outside the vehicle, for example in the case of small vehicles.
  • the present invention aims to overcome this disadvantage by presenting an antenna whose behavior on reception is sufficiently powerful in situ to provide this ability, and which retains this ability for a wide range of possible locations on different vehicles.
  • the object of the invention is also to provide a high performance antenna but geometrically stable in the locations where it will typically be placed within a vehicle, and in particular behind an exterior panel of the vehicle such as a body panel or a panel bumper.
  • an antenna system for receiving tire pressure signal signals from a motor vehicle, the system antenna having at least one active strand (10) and a coaxial cable comprising two coaxial links and a shielding sheath, the coaxial cable being connected on the one hand to this active strand and on the other hand to a ground point of the vehicle, the active strand extending between said ground point and an end remote from the ground point end said infinite impedance end, and the coaxial cable being connected to the active strand at a current point of the active strand located between the ground point and the so-called end with infinite impedance and distinct from the ground point and the so-called end with infinite impedance, characterized in that the active strand describes a loop whose one end is formed by the ground point and the other end forms a point of connection with the coaxial cable, the coaxial cable being connected to the earth point and to the other end of the loop so that the coaxial cable has a stripped shielding portion of the coaxial cable it denuded portion is of negligible
  • FIG. 1 is a side view of an antenna system according to a preferred variant of the invention
  • FIG. 2 is a perspective view of an antenna system according to this same preferred variant of the invention.
  • the antenna system of FIG. 1 consists of an active strand 10, a fixing element 20 and a coaxial cable 30.
  • the active strand 10 is fixed on a panel of the vehicle referenced 40, in this example a rear bumper panel of the vehicle, so that the active strand is on one side of the bumper panel on the inner side of the vehicle. vehicle.
  • the fixing element 20, here a screw 20a is mounted integral with the bumper panel 40 and passes through the active strand 10 at one end 11 of the latter.
  • the screw 20a receives a nut 20b which, when tightened on the screw 20a, presses the end 11 of the active strand 10 against the inner face of the bumper panel 40.
  • the active strand 10 extends substantially parallel to the bumper panel 40, here in a horizontal direction of the vehicle.
  • the active strand 10 has a main portion 12 whose rectilinear shape runs through the inner face of the bumper, separated from this inner face by a substantially constant distance.
  • the attachment end 11 of the active strand although of short extent, has an orientation similar to the rectilinear portion 12 of the active strand 10, that is to say here substantially horizontal in the reference frame of the vehicle.
  • the active strand describes a loop 13.
  • This loop being initiated by the attachment end 11 and the rectilinear portion 12 both oriented in the same direction, it is easily implemented with an active strand in the form of ribbon as is the case in the present example.
  • the ribbon forming the active strand is easily deformed laterally and again on itself to finally form a spiral loop, whose two ends, namely the fastening end 11 and the rectilinear main portion of the ribbon, are parallel and offset vertically.
  • the vertical offset between the fixing end 11 and the rectilinear portion 12 of the ribbon is substantially equal to the width of the ribbon, but it is preferably ensured that there is no contact between two zones of the ribbon. level of the loop 13.
  • the active strand is a copper ribbon with a width of 3 centimeters for a length, which will be specified hereinafter but of the order of about twenty centimeters.
  • the active strand 10 may have any other width or shape in section. It may in particular be constituted by a wire of circular outline in section.
  • the active strand is used essentially for the reception of the signals emitted by the valves equipping the wheels of the vehicle.
  • the antenna system comprises a coaxial cable 30 connected on the one hand to the active strand 10 and to the ground by one of its ends, and to two input poles of a central processing unit and operating signal received on the active strand.
  • This coaxial cable 30 thus has a central core 31 and a peripheral conductor 32.
  • the coaxial further has a shielding sheath 33 protecting the core 31 and the peripheral conductor disturbances and parasitages due to the waves in the presence.
  • the total length of the metal strip forming the active strand 10 is chosen equal to the wavelength of the signals to be received divided by four, for optimal reception of this signal.
  • the coaxial must connect the active strand in two points specifically chosen according to the following conditions.
  • the first point is on the one hand the end to the mass 11 of the active strand.
  • the active strand 10 being considered as a conductive part whose one end is grounded, and the other end is infinite impedance
  • the second contact point is determined to correspond to an impedance measured between it and the end to ground equal to 50 ohms. Such a point of contact brings an optimal reception quality to the antenna.
  • the coaxial cable 30 sees its shielding sheath 33 stop at the fastening screw 20 in order to expose the peripheral conductor 32 and the central core 31 of the coaxial cable, respectively.
  • the central core 31 is then bonded to the active strand 30 at the mass point, which is here the attachment end 11 of the active strand 10. More specifically, the central core 31 is gripped between the nut 20b and the end portion 11 of the active strand in contact with these two elements.
  • the peripheral conductor 32 of the coaxial cable 30 is connected to it at the point of contact at 50 ohms of the active strand 10.
  • the loop 13 is thus configured so that the contact point at 50 ohms is in the current zone of the loop 13 and more precisely, the loop
  • the contact point at 50 ohms referenced 14 in Figure 1
  • the point of contact 14 is in the area of the loop that is closest to the fastening element 20 after the loop 13 has first moved away and then brought closer to this fastener element 20.
  • the coaxial connecting the active strand 10 is two areas geometrically close to each other, the coaxial cable 30 is stripped over a very small extent so that the central core 31 and the peripheral conductor 32 of the coaxial cable 30 influence, by their stripped portion, only slightly on the overall behavior of the present antenna system.
  • the loop geometry allows such a connection by which the coaxial cable, and more generally the antenna collection or supply links in the case of a transmitting antenna, are only weakly stripped and therefore disturb only weakly the operation of the active strand.
  • the present antenna system proves to be particularly efficient in reception as in transmission, the same active strand being present, but not exclusively, used for both transmission and reception. Indeed, the present antenna system applies both as a reception system or as a reception system alone.
  • the present antenna system proves to have very good operating parameters, such as a high stability of its impedance regardless of its position on the vehicle, or whatever the size of the vehicle.
  • the performance in terms of tire pressure indicator data is very advantageous in terms of SNR signal to noise ratio in English - ie in terms of signal-to-noise ratio.
  • French, and also in terms of Delta RSSI that is to say Delta Receive-Signal-Strength-Indicator in English, that is to say in terms of difference of signal power indicator received in French .
  • the TOS, standing wave rate in French - or VSWR - Voltage Standing Wave Ratio in English - is constant regardless of the environment in which this antenna system is located.
  • a spacer 50 of flexible material such as a foam or an elastomeric member. This wedge holds the straight portion against undesired movement of the active strand during the life of the system, and allows precise placement of the active strand in the desired positioning.
  • the fastener 20 has been described as being attached directly to a bumper or bodywork panel of the vehicle.

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  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)

Abstract

The invention relates to an antenna system for receiving automobile tyre pressure signals, the antenna system having at least one active element (10) and one coaxial cable (30) including two coaxial lines (31, 32) and a shielding sheath (33), the coaxial cable (30) being connected by one end to said active element and, by the other end, to an earthing point (20) of the vehicle, the active element (10) extending between said earthing point and a distant end of the earthing point referred to as infinite impedance end, and the coaxial cable (30) being connected to the active element at a current point of the active element located between the earthing point (20) and the so-called infinite impedance end, and separate from the earthing point and from the so-called infinite impedance end, characterised in that the active element (10) forms a loop in which one end (11) is made up of the earthing point (20) and the other end (14) forms a connection point with the coaxial cable, the coaxial cable (30) being connected to the earthing point and to said other end of the loop (14) such that the coaxial cable (30) has a portion stripped of the coaxial cable shielding, said stripped portion having a negligible length given the reception behaviour of the antenna system.

Description

Système d'antenne comprenant un brin actif et un  Antenna system comprising an active strand and a
câble coaxial à dénudage limité  coaxial cable with limited stripping
L'invention concerne les antennes utilisées dans les véhicules automobiles pour la réception de signaux émis localement au niveau des pneus du véhicules lesquels signaux véhiculent une information relative au niveau de gonflage du pneu.  The invention relates to antennas used in motor vehicles for receiving signals emitted locally at the level of the tires of the vehicle, which signals convey information relating to the level of inflation of the tire.
Le domaine de l'invention est plus communément appelé TPMS pour Tire Pressure Measuring Systems en Anglais, système de mesure de pression des pneus en Français, ci-après dénommé TPMS.  The field of the invention is more commonly known as TPMS for Tire Pressure Measuring Systems in English, a tire pressure measuring system in French, hereinafter referred to as TPMS.
Un système TPMS consiste typiquement de quatre valves situées sur les roues du véhicule, dont chacune des valves comprend un émetteur radiofréquences et un récepteur basse fréquence, ainsi qu'une batterie.  A TPMS system typically consists of four valves located on the vehicle wheels, each of which includes a radio frequency transmitter and a low frequency receiver, and a battery.
La valve est typiquement mais non exclusivement interrogée par un signal basse fréquence aux fins d'un diagnostic, et elle répond par un signal en radiofréquences pour transmettre une valeur de pression ou un simple avertissement de pression insuffisante.  The valve is typically but not exclusively interrogated by a low frequency signal for diagnostic purposes, and responds with a radio frequency signal to transmit a pressure value or a simple insufficient pressure warning.
Un système TPMS comprend en outre un récepteur des signaux émis par les valves, lequel récepteur peut réaliser plusieurs fonctions combinées à la réception de tels signaux. Ainsi, le récepteur TPMS peut selon le cas réaliser également la réception de signaux d'ouverture de portes émis par une télécommande à distance. Ce serait le cas d'un récepteur TPMS n'ayant pas de fonction d'interrogation des valves TPMS.  A TPMS system further comprises a receiver of the signals emitted by the valves, which receiver can perform several functions combined with the reception of such signals. Thus, the TPMS receiver can, depending on the case, also perform the reception of door opening signals emitted by a remote remote control. This would be the case of a TPMS receiver that does not have a TPMS valve interrogation function.
Le récepteur TPMS peut également réaliser la fonction de récepteur de signal d'ouverture des portes émis par une télécommande ainsi que la fonction d'immobiliseur du véhicule, c'est-à-dire la fonction de produire un signal de commande de blocage du fonctionnement du moteur du véhicule.  The TPMS receiver can also perform the door opening signal receiver function emitted by a remote control as well as the immobilizer function of the vehicle, i.e. the function of producing an operation blocking control signal. of the vehicle engine.
Le récepteur TPMS peut également réaliser une fonction d'interrogation d'accès au véhicule et de démarrage du type mains-libres, et/ou de verrouillage de colonne de direction, ou plus généralement de contrôleur principal du véhicule - body controller en anglais - réalisant différents contrôles d'alimentation d'accessoires du véhicule. Dans chacun de ces cas, le système présente une antenne radiofréquences, localisée à proximité d'une unité centrale de traitement du signal en réception ou à distance de cette unité centrale. L'antenne peut notamment être intégrée à cette unité centrale. The TPMS receiver can also perform a vehicle access interrogation function and start-up type hands-free, and / or steering column lock, or more generally the main controller of the vehicle - body controller in English - realizing various vehicle accessory power controls. In each of these cases, the system has a radio frequency antenna, located near a central processing unit of the signal in reception or remote from this central unit. The antenna can in particular be integrated in this central unit.
Le système peut présenter ou non une fonction d'identification de la roue concernée par le défaut de pression. Cette fonction est typiquement appelée fonction d'autolocalisation ou « autoloc ».  The system may or may not have a function of identification of the wheel concerned by the lack of pressure. This function is typically called autolocation function or "autoloc".
Cette fonction « autoloc » peut être implémentée par le biais de la technologie WAL- Wireless Autolocation- , qui repose sur la différence d'intensité de signal entre les signaux provenant de l'arrière et de l'avant du véhicule.  This "autoloc" function can be implemented via the WAL- Wireless Autolocation- technology, which is based on the difference in signal strength between the signals coming from the rear and the front of the vehicle.
Cette technologie présente toutefois des inconvénients en termes de placement de l'antenne pour pouvoir réaliser une véritable discrimination entre les signaux provenant de l'avant et de l'arrière du véhicule.  This technology, however, has drawbacks in terms of placement of the antenna to be able to achieve true discrimination between the signals from the front and the rear of the vehicle.
L'emplacement de l'antenne ne doit pas être au centre du véhicule, et l'on peut même en arriver à devoir placer l'antenne de manière déportée par rapport à l'unité de traitement et placer ainsi l'antenne à l'extérieur du véhicule comme par exemple dans le cas de véhicules de petite taille.  The location of the antenna should not be in the center of the vehicle, and it may even be necessary to place the antenna away from the treatment unit and thus place the antenna on the antenna. outside the vehicle, for example in the case of small vehicles.
Néanmoins, ces antennes restent d'une implémentation difficile car exposée à des contraintes fortes de positionnement pour permettre la discrimination entre les signaux provenant des différentes roues du véhicule.  Nevertheless, these antennas remain difficult to implement because they are exposed to strong positioning constraints to allow discrimination between the signals coming from the different wheels of the vehicle.
La présente invention vise à résoudre cet inconvénient en présentant une antenne dont le comportement à la réception est suffisamment performant in situ pour fournir cette aptitude, et qui conserve cette aptitude pour une large gamme d'emplacement possible sur différents véhicules.  The present invention aims to overcome this disadvantage by presenting an antenna whose behavior on reception is sufficiently powerful in situ to provide this ability, and which retains this ability for a wide range of possible locations on different vehicles.
Le but de l'invention est en outre de proposer une antenne performante mais logeable géométriquement dans les emplacements où elle sera typiquement placée au sein d'un véhicule, et notamment derrière un panneau extérieur du véhicule tel qu'un panneau de carrosserie ou un panneau de pare-choc.  The object of the invention is also to provide a high performance antenna but geometrically stable in the locations where it will typically be placed within a vehicle, and in particular behind an exterior panel of the vehicle such as a body panel or a panel bumper.
Ce but est atteint selon l'invention grâce à un système d'antenne de réception de signaux de pression de pneus d'un véhicule automobile, le système d'antenne présentant au moins un brin actif (10) et un câble coaxial comprenant deux liaisons coaxiales et une gaine de blindage, le câble coaxial étant relié d'une part à ce brin actif et d'autre part à un point de masse du véhicule, le brin actif s'étendant entre ledit point de masse et une extrémité distante du point de masse dite extrémité à impédance infinie, et le câble coaxial étant relié au brin actif en un point courant du brin actif situé entre le point de masse et l'extrémité dite à impédance infinie et distinct du point de masse et de l'extrémité dite à impédance infinie, caractérisé en ce que le brin actif décrit une boucle dont une extrémité est formée par le point de masse et l'autre extrémité forme un point de liaison avec le câble coaxial, le câble coaxial étant relié au point de masse et à ladite autre extrémité de la boucle de telle sorte que le câble coaxial présente une portion dénudée de blindage du câble coaxial laquelle portion dénudée est de longueur négligeable au vu du comportement de réception du système d'antenne. This object is achieved according to the invention by means of an antenna system for receiving tire pressure signal signals from a motor vehicle, the system antenna having at least one active strand (10) and a coaxial cable comprising two coaxial links and a shielding sheath, the coaxial cable being connected on the one hand to this active strand and on the other hand to a ground point of the vehicle, the active strand extending between said ground point and an end remote from the ground point end said infinite impedance end, and the coaxial cable being connected to the active strand at a current point of the active strand located between the ground point and the so-called end with infinite impedance and distinct from the ground point and the so-called end with infinite impedance, characterized in that the active strand describes a loop whose one end is formed by the ground point and the other end forms a point of connection with the coaxial cable, the coaxial cable being connected to the earth point and to the other end of the loop so that the coaxial cable has a stripped shielding portion of the coaxial cable it denuded portion is of negligible length in view of the reception behavior of the antenna system.
D'autres caractéristiques, buts et avantages de l'invention apparaîtront à la lecture de la description détaillée qui va suivre, faite en référence aux figures annexées sur lesquelles :  Other characteristics, objects and advantages of the invention will appear on reading the detailed description which follows, made with reference to the appended figures in which:
- La figure 1 est une vue de côté d'un système d'antenne selon une variante préférée de l'invention,  FIG. 1 is a side view of an antenna system according to a preferred variant of the invention,
- La figure 2 est une vue en perspective d'un système d'antenne selon cette même variante préférée de l'invention.  FIG. 2 is a perspective view of an antenna system according to this same preferred variant of the invention.
Le système d'antenne de la figure 1 se compose d'un brin actif 10, d'un élément de fixation 20 et d'un câble coaxial 30.  The antenna system of FIG. 1 consists of an active strand 10, a fixing element 20 and a coaxial cable 30.
Le brin actif 10 est fixé sur un panneau du véhicule référencé 40, dans le présent exemple un panneau de pare-choc arrière du véhicule, de sorte que le brin actif se trouve sur une face de ce panneau de pare-choc du côté interne au véhicule.  The active strand 10 is fixed on a panel of the vehicle referenced 40, in this example a rear bumper panel of the vehicle, so that the active strand is on one side of the bumper panel on the inner side of the vehicle. vehicle.
Pour cela, l'élément de fixation 20, ici une vis 20a, est montée solidaire au panneau de pare-choc 40 et traverse le brin actif 10 au niveau d'une extrémité 11 de ce dernier. La vis 20a reçoit un écrou 20b qui, une fois serré sur la vis 20a, presse l'extrémité 11 du brin actif 10 contre la face interne du panneau de pare- choc 40. For this, the fixing element 20, here a screw 20a, is mounted integral with the bumper panel 40 and passes through the active strand 10 at one end 11 of the latter. The screw 20a receives a nut 20b which, when tightened on the screw 20a, presses the end 11 of the active strand 10 against the inner face of the bumper panel 40.
Le brin actif 10 s'étend essentiellement parallèlement au panneau de pare-choc 40, ici dans une direction horizontale du véhicule. Pour cela le brin actif 10 présente une portion principale 12 dont la forme rectiligne parcourt la face interne du pare-choc, séparée de cette face interne par une distance sensiblement constante.  The active strand 10 extends substantially parallel to the bumper panel 40, here in a horizontal direction of the vehicle. For this the active strand 10 has a main portion 12 whose rectilinear shape runs through the inner face of the bumper, separated from this inner face by a substantially constant distance.
L'extrémité de fixation 11 du brin actif, bien que de courte étendue, présente une orientation similaire à la portion rectiligne 12 du brin actif 10, c'est- à-dire ici sensiblement horizontale dans le référentiel du véhicule.  The attachment end 11 of the active strand, although of short extent, has an orientation similar to the rectilinear portion 12 of the active strand 10, that is to say here substantially horizontal in the reference frame of the vehicle.
Entre l'extrémité de fixation 11 et la portion rectiligne 12 le brin actif décrit une boucle 13.  Between the fixing end 11 and the rectilinear portion 12, the active strand describes a loop 13.
Cette boucle s'initiant par l'extrémité de fixation 11 et la portion rectiligne 12 toutes deux orientées dans la même direction, elle est facilement mise en œuvre avec un brin actif sous forme de ruban comme c'est le cas dans le présent exemple. En effet, le ruban formant le brin actif est facilement déformée latéralement puis à nouveau sur lui-même pour former au final une boucle en spirale, dont les deux extrémités, à savoir l'extrémité de fixation 11 et la portion principale rectiligne du ruban, sont parallèles et décalées verticalement. Le décalage vertical entre l'extrémité de fixation 11 et la portion rectiligne 12 du ruban est sensiblement égal à la largeur du ruban, mais l'on veille préférentiellement à ce qu'il n'y ait pas de contact entre deux zones du ruban au niveau de la boucle 13.  This loop being initiated by the attachment end 11 and the rectilinear portion 12 both oriented in the same direction, it is easily implemented with an active strand in the form of ribbon as is the case in the present example. Indeed, the ribbon forming the active strand is easily deformed laterally and again on itself to finally form a spiral loop, whose two ends, namely the fastening end 11 and the rectilinear main portion of the ribbon, are parallel and offset vertically. The vertical offset between the fixing end 11 and the rectilinear portion 12 of the ribbon is substantially equal to the width of the ribbon, but it is preferably ensured that there is no contact between two zones of the ribbon. level of the loop 13.
Dans le cas présent, le brin actif est un ruban en cuivre d'une largeur de 3 centimètres pour une longueur, que l'on précisera ci-après mais de l'ordre d'une vingtaine de centimètres.  In this case, the active strand is a copper ribbon with a width of 3 centimeters for a length, which will be specified hereinafter but of the order of about twenty centimeters.
En alternative, le brin actif 10 peut présenter toute autre largeur ou toute forme en section. Il peut notamment être constitué par un fil métallique de contour circulaire en section. Le brin actif est utilisé essentiellement pour la réception des signaux émis par les valves équipant les roues du véhicule. Pour le prélèvement de ce signaux sur le brin actif 10, le système d'antenne comporte un câble coaxial 30 relié d'une part au brin actif 10 et à la masse par une de ses extrémités, et à deux pôles d'entrée d'une unité centrale de traitement et d'exploitation du signal reçu sur le brin actif. Alternatively, the active strand 10 may have any other width or shape in section. It may in particular be constituted by a wire of circular outline in section. The active strand is used essentially for the reception of the signals emitted by the valves equipping the wheels of the vehicle. For the collection of this signal on the active strand 10, the antenna system comprises a coaxial cable 30 connected on the one hand to the active strand 10 and to the ground by one of its ends, and to two input poles of a central processing unit and operating signal received on the active strand.
Ce câble coaxial 30 présente donc une âme centrale 31 et un conducteur périphérique 32. Le coaxial présente en outre une gaine de blindage 33 protégeant l'âme 31 et le conducteur périphérique des perturbations et parasitages dus aux ondes en présence.  This coaxial cable 30 thus has a central core 31 and a peripheral conductor 32. The coaxial further has a shielding sheath 33 protecting the core 31 and the peripheral conductor disturbances and parasitages due to the waves in the presence.
La longueur totale du ruban métallique formant le brin actif 10 est choisie égale à la longueur d'onde des signaux à recevoir divisée par quatre, pour une réception optimale de ce signaux.  The total length of the metal strip forming the active strand 10 is chosen equal to the wavelength of the signals to be received divided by four, for optimal reception of this signal.
En outre et toujours pour une réception optimale, le coaxial doit relier le brin actif en deux points spécifiquement choisis selon les conditions suivantes. In addition and always for optimal reception, the coaxial must connect the active strand in two points specifically chosen according to the following conditions.
Le premier point est d'une part l'extrémité à la masse 11 du brin actif. D'autre part, le brin actif 10 étant considéré comme une pièce conductrice dont une extrémité est à la masse, et l'autre extrémité est à impédance infinie, le deuxième point de contact est déterminé pour correspondre à une impédance mesurée entre lui et l'extrémité à la masse égale à 50 ohms. Un tel point de contact apporte une qualité de réception optimale à l'antenne. The first point is on the one hand the end to the mass 11 of the active strand. On the other hand, the active strand 10 being considered as a conductive part whose one end is grounded, and the other end is infinite impedance, the second contact point is determined to correspond to an impedance measured between it and the end to ground equal to 50 ohms. Such a point of contact brings an optimal reception quality to the antenna.
Tel que représenté sur la figure 1 , le câble coaxial 30 voit sa gaine de blindage 33 s'arrêter au niveau de la vis de fixation 20 pour laisser à nu respectivement le conducteur périphérique 32 et l'âme centrale 31 du câble coaxial.  As shown in FIG. 1, the coaxial cable 30 sees its shielding sheath 33 stop at the fastening screw 20 in order to expose the peripheral conductor 32 and the central core 31 of the coaxial cable, respectively.
L'âme centrale 31 est alors liée au brin actif 30 au niveau du point de masse, qui est ici l'extrémité de fixation 11 du brin actif 10. Plus précisément, l'âme centrale 31 est prise en pincement entre l'écrou 20b et la portion d'extrémité 11 du brin actif en contact avec ces deux éléments. Le conducteur périphérique 32 du câble coaxial 30 est lui relié au point de contact à 50 ohms du brin actif 10. La boucle 13 est ainsi configurée pour que le point de contact à 50 ohms se situe en zone courante de la boucle 13 et plus précisément, la boucleThe central core 31 is then bonded to the active strand 30 at the mass point, which is here the attachment end 11 of the active strand 10. More specifically, the central core 31 is gripped between the nut 20b and the end portion 11 of the active strand in contact with these two elements. The peripheral conductor 32 of the coaxial cable 30 is connected to it at the point of contact at 50 ohms of the active strand 10. The loop 13 is thus configured so that the contact point at 50 ohms is in the current zone of the loop 13 and more precisely, the loop
13 est configurée de sorte que le point de contact à 50 ohms, référencé 14 sur la figure 1 , se situe à mi-chemin entre la portion d'extrémité 11 du brin actif et la portion rectiligne 12 du brin actif. Le point de contact 14 se trouve dans la zone de la boucle qui est la plus rapprochée de l'élément de fixation 20 après que la boucle 13 se soit d'abord éloignée, puis rapprochée de cet élément de fixation 20. 13 is configured so that the contact point at 50 ohms, referenced 14 in Figure 1, is midway between the end portion 11 of the active strand and the straight portion 12 of the active strand. The point of contact 14 is in the area of the loop that is closest to the fastening element 20 after the loop 13 has first moved away and then brought closer to this fastener element 20.
Ainsi, le coaxial reliant le brin actif 10 est deux zones géométriquement proches l'une de l'autre, le câble coaxial 30 se voit dénudé sur une étendue très faible de sorte que l'âme centrale 31 et le conducteur périphérique 32 du câble coaxial 30 n'influent, par leur partie dénudée, que faiblement sur le comportement d'ensemble du présent système d'antenne. La géométrie en boucle permet un tel raccordement par lequel le câble coaxial, et plus généralement les liaisons de prélèvement ou d'alimentation de l'antenne dans le cas d'une antenne d'émission, ne sont que faiblement dénudées et ne perturbent donc que faiblement le fonctionnement du brin actif.  Thus, the coaxial connecting the active strand 10 is two areas geometrically close to each other, the coaxial cable 30 is stripped over a very small extent so that the central core 31 and the peripheral conductor 32 of the coaxial cable 30 influence, by their stripped portion, only slightly on the overall behavior of the present antenna system. The loop geometry allows such a connection by which the coaxial cable, and more generally the antenna collection or supply links in the case of a transmitting antenna, are only weakly stripped and therefore disturb only weakly the operation of the active strand.
Le présent système d'antenne se révèle avoir un comportement particulièrement efficace en réception comme en émission, le même brin actif étant présentement, mais non exclusivement, utilisé à la fois pour l'émission et pour la réception. En effet, le présent système d'antenne s'applique aussi bien en tant que système de réception ou en tant que système de réception seule.  The present antenna system proves to be particularly efficient in reception as in transmission, the same active strand being present, but not exclusively, used for both transmission and reception. Indeed, the present antenna system applies both as a reception system or as a reception system alone.
Le présent système d'antenne s'avère en effet avoir de très bons paramètres de fonctionnement, comme une grande stabilité de son impédance quelle que soit sa position sur le véhicule, ou quelle que soit la taille du véhicule.  The present antenna system proves to have very good operating parameters, such as a high stability of its impedance regardless of its position on the vehicle, or whatever the size of the vehicle.
En particulier avec ce système d'antenne, les performance en termes de relevé de données indicatrices de pression des pneus sont très avantageuses en termes de SNR- Signal to Noise Ratio en anglais- c'est à dire en termes de rapport signal à bruit en Français, et également en termes de Delta RSSI, c'est- à-dire de Delta Receive-Signal-Strength-Indicator en anglais, c'est-à-dire en terme de différence d'indicateur de puissance de signal reçu en français. Le TOS, taux d'ondes stationnaires en français - ou VSWR - Voltage Standing Wave Ratio en Anglais - est constant quel que soit l'environnement dans lequel se trouve ce système d'antenne. In particular with this antenna system, the performance in terms of tire pressure indicator data is very advantageous in terms of SNR signal to noise ratio in English - ie in terms of signal-to-noise ratio. French, and also in terms of Delta RSSI, that is to say Delta Receive-Signal-Strength-Indicator in English, that is to say in terms of difference of signal power indicator received in French . The TOS, standing wave rate in French - or VSWR - Voltage Standing Wave Ratio in English - is constant regardless of the environment in which this antenna system is located.
Dans le présent mode de réalisation, on dispose entre la portion rectiligne 12 du brin actif 10 et le panneau de pare-choc 40 une cale 50 en matériau souple tel qu'une mousse ou un élément élastomère. Cette cale maintient la portion rectiligne contre tout déplacement non souhaité du brin actif au cours de la durée de vie du système, et permet un placement précis du brin actif 10 dans le positionnement souhaité.  In the present embodiment, there is disposed between the straight portion 12 of the active strand 10 and the bumper panel 40 a spacer 50 of flexible material such as a foam or an elastomeric member. This wedge holds the straight portion against undesired movement of the active strand during the life of the system, and allows precise placement of the active strand in the desired positioning.
Dans le présent mode de réalisation, l'élément de fixation 20 a été décrit comme étant fixé directement sur le un panneau de pare-choc ou de carrosserie du véhicule.  In the present embodiment, the fastener 20 has been described as being attached directly to a bumper or bodywork panel of the vehicle.
En alternative, on dispose une plaque support en recouvrement du panneau de pare-choc ou du panneau de carrosserie, sur le côté intérieur au véhicule d'un tel panneau de pare-choc ou du panneau de carrosserie, et on fixe le brin actif sur une telle plaque support de manière similaire à celle décrite précédemment. La fixation de la plaque support sur le panneau de pare-choc ou de carrosserie peut alors être faite par vissage ou encore par clippage.  Alternatively, there is a support plate covering the bumper panel or the body panel, on the inside of the vehicle of such a bumper panel or the body panel, and the active strand is fixed on such a support plate in a manner similar to that described above. Fixing the support plate on the bumper or body panel can then be made by screwing or by clipping.

Claims

REVENDICATIONS
1. Système d'antenne de réception de signaux de pression de pneus d'un véhicule automobile, le système d'antenne présentant au moins un brin actif (10) et un câble coaxial (30) comprenant deux liaisons coaxiales (31 , 32) et une gaine de blindage (33), le câble coaxial (30) étant relié d'une part à ce brin actif et d'autre part à un point de masse (20) du véhicule, le brin actif (10) s'étendant entre ledit point de masse et une extrémité distante du point de masse dite extrémité à impédance infinie, et le câble coaxial (30) étant relié au brin actif en un point courant du brin actif situé entre le point de masse (20) et l'extrémité dite à impédance infinie et distinct du point de masse et de l'extrémité dite à impédance infinie, caractérisé en ce que le brin actif (10) décrit une boucle dont une extrémité (11 ) est formée par le point de masse (20) et l'autre extrémité (14) forme un point de liaison avec le câble coaxial, le câble coaxial (30) étant relié au point de masse et à ladite autre extrémité de la boucle (14) de telle sorte que le câble coaxial (30) présente une portion dénudée de blindage du câble coaxial laquelle portion dénudée est de longueur négligeable au vu du comportement de réception du système d'antenne. A tire pressure signal receiving antenna system of a motor vehicle, the antenna system having at least one active strand (10) and a coaxial cable (30) comprising two coaxial links (31, 32) and a shielding sheath (33), the coaxial cable (30) being connected on the one hand to this active strand and on the other hand to a ground point (20) of the vehicle, the active strand (10) extending between said ground point and an end remote from the ground point of said infinite impedance end, and the coaxial cable (30) being connected to the active strand at a current point of the active strand between the ground point (20) and the said end with infinite impedance and distinct from the ground point and said end with infinite impedance, characterized in that the active strand (10) describes a loop, one end (11) of which is formed by the ground point (20) and the other end (14) forms a connection point with the coaxial cable, the coaxial cable (30) both connected to the ground point and to said other end of the loop (14) so that the coaxial cable (30) has a stripped shielding portion of the coaxial cable which stripped portion is of negligible length in view of the receiving behavior of the antenna system.
2. Système d'antenne selon la revendication 1 , caractérisé en ce que le câble coaxial (30) est relié au brin actif (10) en un point de contact (14) situé à une distance du point de masse (11 , 20) du brin actif qui est choisie pour que le point de contact (14) présente une impédance sensiblement égale à 50 Ohms par rapport au point de masse (11 , 20).  Antenna system according to claim 1, characterized in that the coaxial cable (30) is connected to the active strand (10) at a point of contact (14) at a distance from the ground point (11, 20). active strand which is chosen so that the contact point (14) has an impedance substantially equal to 50 ohms relative to the ground point (11, 20).
3. Système d'antenne selon la revendication 1 , caractérisé en ce que le brin actif (10) s'étend dans une direction sensiblement horizontale du véhicule.  Antenna system according to claim 1, characterized in that the active strand (10) extends in a substantially horizontal direction of the vehicle.
4. Système d'antenne selon la revendication 1 , caractérisé en ce que le brin actif (10) présente une longueur égale à la longueur d'onde des signaux reçus et/ou émis divisée par 4.  Antenna system according to claim 1, characterized in that the active strand (10) has a length equal to the wavelength of the received and / or transmitted signals divided by 4.
5. Système d'antenne selon la revendication 1 , caractérisé en ce que le brin actif (10) est fixé sur un élément du véhicule (14) qui forme un élément de masse du véhicule et en ce que le point de masse (11 , 20) du brin actif (10) est un point de fixation (20) du brin actif sur l'élément de masse (14) du véhicule. Antenna system according to claim 1, characterized in that the active strand (10) is attached to an element of the vehicle (14) which forms an element of mass of the vehicle and in that the mass point (11, 20) of the active strand (10) is an attachment point (20) of the active strand on the mass element (14) of the vehicle.
6. Système d'antenne selon la revendication précédente, caractérisé en ce que le brin actif (10) est fixé sur l'élément de masse (40) du véhicule par vissage.  6. Antenna system according to the preceding claim, characterized in that the active strand (10) is fixed on the mass element (40) of the vehicle by screwing.
7. Système d'antenne selon l'une quelconque des revendications précédentes, caractérisé en ce que le brin actif (10) est constitué d'un ruban métallique.  7. Antenna system according to any one of the preceding claims, characterized in that the active strand (10) consists of a metal ribbon.
PCT/EP2010/059410 2009-07-16 2010-07-01 Antenna system including an active element and a coaxial cable with limited stripping WO2011006769A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0903494A FR2948235B1 (en) 2009-07-16 2009-07-16 ANTENNA SYSTEM COMPRISING AN ACTIVE STRENGTH AND A LIMITING STRETCH CABLE
FR0903494 2009-07-16

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WO2011006769A1 true WO2011006769A1 (en) 2011-01-20

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DE102013104116A1 (en) * 2013-04-24 2014-10-30 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Fastening device for a component on a motor vehicle

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EP1011167A1 (en) * 1998-07-02 2000-06-21 Matsushita Electric Industrial Co., Ltd. Antenna unit, communication system and digital television receiver
EP1291968A1 (en) * 2000-06-08 2003-03-12 Matsushita Electric Industrial Co., Ltd. Antenna and radio device comprising the same
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FR2948235A1 (en) 2011-01-21

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