EP1244175B1 - Antenna coil for transmitting a signal in a determined frequencies bandwidth - Google Patents

Antenna coil for transmitting a signal in a determined frequencies bandwidth Download PDF

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Publication number
EP1244175B1
EP1244175B1 EP02005623.0A EP02005623A EP1244175B1 EP 1244175 B1 EP1244175 B1 EP 1244175B1 EP 02005623 A EP02005623 A EP 02005623A EP 1244175 B1 EP1244175 B1 EP 1244175B1
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EP
European Patent Office
Prior art keywords
coils
series
turns
wire
antenna according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02005623.0A
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German (de)
French (fr)
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EP1244175A1 (en
Inventor
Charles M. Rydel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Comfort and Driving Assistance SAS
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Valeo Securite Habitacle SAS
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Publication of EP1244175A1 publication Critical patent/EP1244175A1/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
    • 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
    • H01Q1/3208—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used
    • H01Q1/3233—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems
    • H01Q1/3241—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems particular used in keyless entry systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • 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
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength
    • H01Q9/27—Spiral antennas

Definitions

  • the invention relates to an antenna emitting electromagnetic radiation comprising a set of turns. It relates more particularly, but not exclusively, to a wire antenna which is formed from a sheet or ribbon of parallel wires.
  • the document EP0289136 describes a device according to the preamble of claim 1.
  • a transmitting wire antenna for transmitting square signals in a relatively narrow frequency band.
  • Such an emission device is used, in particular for transmitting signals from a motor vehicle to a portable object normally held by the holder of the vehicle; after an interrogation transmitted from the vehicle to the object, the latter emits to the vehicle an identification signal which is used to allow the unlocking of the doors and / or the actuating contact of the vehicle.
  • This communication system between the vehicle and the portable object avoids the introduction of keys into locks.
  • a transmitter should transmit only the frequencies for which it is intended so as not to cause interference in other frequency areas that are usually used for other transmissions. In the case of the emission of square signals, the risks of transmission in adjacent frequency bands are important.
  • the invention results from the observation that undesired emissions are mainly caused by parasitic capacitances as well as inductances of turns.
  • the invention provides that the emitting turns form a sheet of wires in which a turn is provided at a reference potential, such as the mass, between two emission turns.
  • the two inductors which constitute the antenna, form an autotransformer.
  • the intensity of the current emitted is particularly high.
  • the transmission is fast.
  • the invention relates to a wire antenna for a device for transmitting periodic radioelectric signals in a determined band of frequencies comprising a set of wire turns.
  • This antenna is such that two emitting turns are separated by a turn taken to a reference potential such as ground.
  • the turns are for example part of a sheet of son integral with each other.
  • the antenna can be used in a vehicle information transmission device to a portable object located near the vehicle, this device being intended to transmit signals alternately conducting and blocked a controlled switch, such as a transistor, this device being such that, for transmission, at least one primary turn of emission and, in series with this primary turn, secondary turns in series, the controlled switch being connected to the junction between the primary turn and the secondary turns, a capacitor being arranged across all of these turns in series, the mounting being such that when the switch is conductive, the primary coil is charged with energy, and when the switch is open, this energy is supplied to the oscillating circuit formed by all the series of turns and the capacitor.
  • a controlled switch such as a transistor
  • the antennas that will be described in relation to the figures, in particular the Figures 2 and 4 , are intended for the transmission of information from a motor vehicle to a portable object nearby. Such wired antennas are excited by square signals.
  • the figure 1 and the figure 3 represent exemplary embodiments of transmission circuits.
  • the transmission circuit known in itself, represented on the figure 1 comprises, between a terminal 10, on which is applied the positive pole of a battery of the vehicle, and the ground, an inductor 12 and a MOS transistor 14.
  • the common point of the transistor 14 and the inductor 12 is connected to the mass via a capacitor 16, an emission coil or antenna 18, and a resistor 20.
  • the signals applied to the electrode 14 1 of the transistor 14 can be modulated in two different ways.
  • the slots applied on the electrode 14 1 have a constant frequency but a transmission over several periods corresponds, for example, to a "1" while an absence of emission corresponds to a "0".
  • Such all-or-nothing control is sometimes referred to as amplitude modulation. It can be used to emit a wake-up signal from a nearby badge.
  • the control signals of the transistor may also be modulated in frequency, that is to say that the information to be transmitted by the antenna 18 is represented by the frequency of the square signals applied to the control electrode of the transistor 14.
  • the antenna 18 consists of turns each of which has the general shape of a rectangle. These turns are embedded in the roof of the vehicle (not shown) and are formed from a sheet of insulated wires 22 1 to 22 7 forming a ribbon.
  • the ends of the wires are connected to a printed circuit board 24 ( figure 2a ) which comprises conductive paths allowing the turns to be connected in series in the following order: 22 1 , 22 3 , 22 5 , 22 2 , 22 4 , 22 6 and 22 7 .
  • the even-rank turns 22 2 , 22 4 and 22 6 each have a ground terminal. For simplicity, only one conductive path 26 has been shown on the figure 2a .
  • the inductance with seven turns 22 1 to 22 7 comprises an alternation of son arranged one after the other, a wire (constituting a turn) being preceded and followed by a wire to ground.
  • the turns 22 2 , 22 4 and 22 6 ground constitute screens which reduce parasitic capacitances between turns. Under these conditions, it has been found that emissions outside the useful band of frequencies are negligible.
  • the transmitting device includes, like that shown on the figure 1 a transistor 30, for example of the MOS type, on the control electrode 31 to which rectangular signals are applied.
  • a transistor 30 for example of the MOS type
  • One terminal of this switch transistor 30 is connected to the ground while its other terminal is connected to a connection point 32 between a primary inductance 34 and a secondary inductor 36.
  • the inductances 34 and 36 are constituted by turns in series.
  • the terminal of the inductor 34 which is opposite the terminal 32 of junction to the transistor 30 is connected to the positive terminal (+) 38 of a storage battery whose other terminal is connected to ground.
  • a capacitor 40 is arranged across the two inductors 34 and 36 in series.
  • Inductors 34 and 36 constituting the transmitting antenna, are formed from a son ply 42 0-42 8 wherein the son 42 0 42 8 tape form an outer shield, these son 42 0 and 42 8 being grounded and not constituting turns for inductances 34 and 36.
  • the inductor 34 is made from the wires 42 2 , 42 4 and 42 6 in parallel and the inductor 36 is made from the wires forming series turns 42 1 , 42 3 , 42 5 and 42 7 .
  • the wires 42 2 , 42 4 and 42 6 are on each side at the same potential, namely one end of the wires is on one side at the positive potential of the battery (reference 38 on the figure 3 ) and on the other hand, these wires are all connected to the same point 32.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Transmitters (AREA)

Description

L'invention est relative à une antenne émettrice de rayonnement électromagnétique comportant un ensemble de spires. Elle concerne plus particulièrement, mais non exclusivement, une antenne filaire qui est formée à partir d'une nappe ou ruban de fils parallèles.The invention relates to an antenna emitting electromagnetic radiation comprising a set of turns. It relates more particularly, but not exclusively, to a wire antenna which is formed from a sheet or ribbon of parallel wires.

Le document EP0289136 décrit un dispositif selon le préambule de la revendication 1. Dans ce qui suit, on considérera à titre d'exemple préféré une antenne filaire d'émission destinée à transmettre des signaux carrés dans une bande de fréquences relativement étroite. Un tel dispositif d'émission est utilisé, notamment pour transmettre des signaux d'un véhicule automobile vers un objet portatif normalement détenu par le titulaire du véhicule ; à la suite d'une interrogation transmise du véhicule vers l'objet, ce dernier émet vers le véhicule un signal d'identification qui est utilisable pour permettre le déverrouillage des portières et/ou le contact d'actionnement du véhicule. Ce système de communication entre le véhicule et l'objet portatif évite l'introduction de clés dans des serrures.The document EP0289136 describes a device according to the preamble of claim 1. In the following, we will consider as a preferred example a transmitting wire antenna for transmitting square signals in a relatively narrow frequency band. Such an emission device is used, in particular for transmitting signals from a motor vehicle to a portable object normally held by the holder of the vehicle; after an interrogation transmitted from the vehicle to the object, the latter emits to the vehicle an identification signal which is used to allow the unlocking of the doors and / or the actuating contact of the vehicle. This communication system between the vehicle and the portable object avoids the introduction of keys into locks.

De façon générale, un émetteur ne doit transmettre que les fréquences pour lesquelles il est prévu afin de ne pas provoquer de parasites dans d'autres domaines de fréquences qui sont habituellement utilisés pour d'autres émissions. Dans le cas de l'émission de signaux carrés, les risques d'émission dans des bandes de fréquences adjacentes sont importants.In general, a transmitter should transmit only the frequencies for which it is intended so as not to cause interference in other frequency areas that are usually used for other transmissions. In the the case of the emission of square signals, the risks of transmission in adjacent frequency bands are important.

L'invention résulte de la constatation que les émissions indésirées ont principalement pour origine les capacités parasites ainsi que les inductances des spires.The invention results from the observation that undesired emissions are mainly caused by parasitic capacitances as well as inductances of turns.

Pour diminuer ces capacités et inductances parasites, l'invention prévoit que les spires émettrices forment une nappe de fils dans laquelle on prévoit une spire portée à un potentiel de référence, tel que la masse, entre deux spires d'émission.To reduce these parasitic capacitances and inductances, the invention provides that the emitting turns form a sheet of wires in which a turn is provided at a reference potential, such as the mass, between two emission turns.

On a constaté qu'avec cette disposition, les capacités parasites entre spires sont diminuées, ce qui évite l'émission de signaux en dehors de la bande de fréquence utilisée.It has been found that with this arrangement, parasitic capacitances between turns are reduced, which prevents the emission of signals outside the frequency band used.

Les spires portées à la tension de référence peuvent être actives ou inactives, c'est-à-dire qu'elles constituent des spires d'émission ou qu'elles constituent seulement des spires de protection ou blindage.The turns taken to the reference voltage may be active or inactive, that is to say they constitute emission turns or they constitute only protective turns or shielding.

Dans le premier cas (spires d'émission), l'ensemble des spires portées au potentiel de référence constitue un ensemble de spires en parallèle analogue à une seule spire.In the first case (emission turns), all the turns taken to the reference potential constitute a set of turns in parallel analogous to a single turn.

Dans un mode de réalisation, l'antenne est associée à un circuit d'émission dans lequel les signaux à émettre sont appliqués à un interrupteur commandé de façon à le rendre alternativement conducteur et bloqué et l'antenne comporte une inductance primaire constituée d'une spire ou de plusieurs spires en parallèle et une inductance secondaire en série avec cette inductance primaire, cette inductance comportant une ou plusieurs spires en série. L'interrupteur commandé est relié à la jonction entre ces deux inductances, un condensateur étant disposé aux bornes de l'ensemble des deux inductances en série et le montage est tel que, lorsque l'interrupteur est conducteur, l'inductance primaire se charge en énergie, et lorsque l'interrupteur est ouvert, cette énergie est fournie au circuit oscillant constitué par les deux inductances en série et le condensateur, la résistance de perte de ce circuit oscillant étant négligeable.In one embodiment, the antenna is associated with a transmission circuit in which the signals to be transmitted are applied to a controlled switch so as to make it alternately conducting and blocked and the antenna comprises a primary inductance consisting of a spire or several turns in parallel and a secondary inductance in series with this primary inductance, this inductance comprising one or more turns in series. The controlled switch is connected to the junction between these two inductors, a capacitor being disposed across all the two inductors in series and the mounting is such that, when the switch is conductive, the primary inductance is charged with energy, and when the switch is open, this energy is supplied to the oscillating circuit constituted by the two series inductances and the capacitor, the loss resistance of this oscillating circuit being negligible.

Ainsi, les deux inductances, qui constituent l'antenne, forment un autotransformateur. Avec cette réalisation, l'intensité du courant émis est particulièrement élevée. En outre, la transmission est rapide.Thus, the two inductors, which constitute the antenna, form an autotransformer. With this embodiment, the intensity of the current emitted is particularly high. In addition, the transmission is fast.

En bref, l'invention concerne une antenne filaire pour dispositif d'émission de signaux radio-électriques périodiques dans une bande déterminée de fréquences comprenant un ensemble de spires filaires. Cette antenne est telle que deux spires émettrices sont séparées par une spire portée à un potentiel de référence tel que la masse.In short, the invention relates to a wire antenna for a device for transmitting periodic radioelectric signals in a determined band of frequencies comprising a set of wire turns. This antenna is such that two emitting turns are separated by a turn taken to a reference potential such as ground.

La spire (ou les) spire(s) portée(s) à un potentiel de référence peut constituer aussi une (ou des) spire(s) d'émission. Dans ce cas, plusieurs spires portées à un potentiel de référence peuvent être disposées en parallèle.The turn (or turns) taken at a reference potential may also constitute one (or more) turn (es) of emission. In this case, several turns brought to a reference potential can be arranged in parallel.

Selon une réalisation, la (les) spire(s) portée(s) à un potentiel de référence et les autres spires émettrices forment un autotransformateur.In one embodiment, the coil (s) carried at a reference potential and the other emitter turns form an autotransformer.

Les spires font par exemple partie d'une nappe de fils solidaires les uns des autres.The turns are for example part of a sheet of son integral with each other.

Dans un mode de réalisation, la liaison des spires les unes aux autres est effectuée par l'intermédiaire d'une plaquette (24) de type circuit imprimé.In one embodiment, the connection of the turns to each other is performed by means of a board (24) of printed circuit type.

Lorsque la (les) spire(s) portée(s) à un potentiel de référence constitue une (des) spire(s) d'émission, l'antenne peut être utilisée dans un dispositif d'émission d'informations d'un véhicule vers un objet portatif se trouvant à proximité du véhicule, ce dispositif étant destiné à transmettre des signaux rendant alternativement conducteur et bloqué un interrupteur commandé, tel qu'un transistor, ce dispositif étant tel que, pour l'émission, on prévoit au moins une spire primaire d'émission et, en série avec cette spire primaire, des spires secondaires en série, l'interrupteur commandé étant relié à la jonction entre la spire primaire et les spires secondaires, un condensateur étant disposé aux bornes de l'ensemble de ces spires en série, le montage étant tel que, lorsque l'interrupteur est conducteur, la spire primaire se charge en énergie, et lorsque l'interrupteur est ouvert, cette énergie est fournie au circuit oscillant constitué par l'ensemble des spires en série et le condensateur.When the turn (es) brought to a reference potential constitutes a transmission turn (es), the antenna can be used in a vehicle information transmission device to a portable object located near the vehicle, this device being intended to transmit signals alternately conducting and blocked a controlled switch, such as a transistor, this device being such that, for transmission, at least one primary turn of emission and, in series with this primary turn, secondary turns in series, the controlled switch being connected to the junction between the primary turn and the secondary turns, a capacitor being arranged across all of these turns in series, the mounting being such that when the switch is conductive, the primary coil is charged with energy, and when the switch is open, this energy is supplied to the oscillating circuit formed by all the series of turns and the capacitor.

D'autres caractéristiques et avantages de l'invention apparaîtront avec la description de certains de ses modes de réalisation, celle-ci étant effectuée en se référant aux dessins ci-annexés sur lesquels :

  • la figure 1 représente un dispositif émetteur à bord d'un véhicule,
  • la figure 2 représente les spires du dispositif de la figure 1 disposées conformément à l'invention,
  • la figure 2a montre un détail de l'antenne représentée sur la figure 2,
  • la figure 3 est un schéma analogue à celui de la figure 1 pour un autre dispositif d'émission,
  • la figure 4 représente un mode de réalisation conforme à l'invention des spires d'émission du dispositif de la figure 3, et
  • la figure 4a est un schéma montrant les liaisons entre spires de l'antenne représentée sur la figure 4.
Other characteristics and advantages of the invention will become apparent with the description of some of its embodiments, this being done with reference to the attached drawings in which:
  • the figure 1 represents a transmitting device on board a vehicle,
  • the figure 2 represents the turns of the device of the figure 1 arranged according to the invention,
  • the figure 2a shows a detail of the antenna shown on the figure 2 ,
  • the figure 3 is a diagram similar to that of the figure 1 for another transmission device,
  • the figure 4 represents an embodiment according to the invention of the emission turns of the device of the figure 3 , and
  • the figure 4a is a diagram showing the connections between turns of the antenna represented on the figure 4 .

Les antennes que l'on va décrire en relation avec les figures, notamment les figures 2 et 4, sont destinées à l'émission d'informations d'un véhicule automobile vers un objet portatif à proximité. De telles antennes filaires sont excitées par des signaux carrés. La figure 1 et la figure 3 représentent des exemples de réalisation de circuits d'émission.The antennas that will be described in relation to the figures, in particular the Figures 2 and 4 , are intended for the transmission of information from a motor vehicle to a portable object nearby. Such wired antennas are excited by square signals. The figure 1 and the figure 3 represent exemplary embodiments of transmission circuits.

Le circuit d'émission, connu en lui-même, représenté sur la figure 1 comporte, entre une borne 10, sur laquelle est appliqué le pôle positif d'une batterie du véhicule, et la masse, une inductance 12 et un transistor MOS 14. Le point commun au transistor 14 et à l'inductance 12 est relié à la masse par l'intermédiaire d'un condensateur 16, d'une bobine ou antenne 18 d'émission, et d'une résistance 20.The transmission circuit, known in itself, represented on the figure 1 comprises, between a terminal 10, on which is applied the positive pole of a battery of the vehicle, and the ground, an inductor 12 and a MOS transistor 14. The common point of the transistor 14 and the inductor 12 is connected to the mass via a capacitor 16, an emission coil or antenna 18, and a resistor 20.

Sur l'électrode de commande 141 du transistor 14, sont appliqués des signaux carrés qui rendent le transistor alternativement bloqué et conducteur.On the control electrode 14 1 of the transistor 14, square signals are applied which render the transistor alternately blocked and conductive.

Lorsque le transistor 14 est conducteur, l'inductance 12 accumule de l'énergie qu'elle restitue à l'antenne 18 lorsque ce transistor est bloqué.When the transistor 14 is conductive, the inductor 12 accumulates energy that it returns to the antenna 18 when the transistor is blocked.

Les signaux appliqués sur l'électrode 141 du transistor 14 peuvent être modulés de deux manières différentes. Dans la première manière, les créneaux appliqués sur l'électrode 141 ont une fréquence constante mais une émission sur plusieurs périodes correspond, par exemple, à un "1" tandis qu'une absence d'émission correspond à un "0". Une telle commande par tout ou rien est quelquefois dénommée modulation d'amplitude. Elle peut être utilisée pour émettre un signal de réveil d'un badge se trouvant à proximité.The signals applied to the electrode 14 1 of the transistor 14 can be modulated in two different ways. In the first manner, the slots applied on the electrode 14 1 have a constant frequency but a transmission over several periods corresponds, for example, to a "1" while an absence of emission corresponds to a "0". Such all-or-nothing control is sometimes referred to as amplitude modulation. It can be used to emit a wake-up signal from a nearby badge.

Les signaux de commande du transistor peuvent être aussi modulés en fréquence, c'est-à-dire que les informations à transmettre par l'antenne 18 sont représentées par la fréquence des signaux carrés appliqués sur l'électrode de commande du transistor 14.The control signals of the transistor may also be modulated in frequency, that is to say that the information to be transmitted by the antenna 18 is represented by the frequency of the square signals applied to the control electrode of the transistor 14.

L'antenne 18 est constituée de spires dont chacune a la forme générale d'un rectangle. Ces spires sont noyées dans le toit du véhicule (non montré) et sont formées à partir d'une nappe de fils isolés 221 à 227 formant un ruban.The antenna 18 consists of turns each of which has the general shape of a rectangle. These turns are embedded in the roof of the vehicle (not shown) and are formed from a sheet of insulated wires 22 1 to 22 7 forming a ribbon.

Les extrémités des fils sont connectées à une plaquette de circuit imprimé 24 (figure 2a) qui comporte des chemins conducteurs permettant que les spires soient connectées en série dans l'ordre suivant : 221, 223, 225, 222, 224, 226 et 227. Les spires de rang pair 222, 224 et 226 présentent chacune une borne à la masse. Pour simplifier, un seul chemin conducteur 26 a été représenté sur la figure 2a.The ends of the wires are connected to a printed circuit board 24 ( figure 2a ) which comprises conductive paths allowing the turns to be connected in series in the following order: 22 1 , 22 3 , 22 5 , 22 2 , 22 4 , 22 6 and 22 7 . The even-rank turns 22 2 , 22 4 and 22 6 each have a ground terminal. For simplicity, only one conductive path 26 has been shown on the figure 2a .

Ainsi, l'inductance à sept spires 221 à 227 comporte une alternance de fils disposés les uns à la suite des autres, un fil (constituant une spire) étant précédé et suivi par un fil à la masse.Thus, the inductance with seven turns 22 1 to 22 7 comprises an alternation of son arranged one after the other, a wire (constituting a turn) being preceded and followed by a wire to ground.

Les spires 222, 224 et 226 à la masse constituent des écrans qui réduisent les capacités parasites entre spires. Dans ces conditions, on a constaté que les émissions hors de la bande utile de fréquences sont négligeables.The turns 22 2 , 22 4 and 22 6 ground constitute screens which reduce parasitic capacitances between turns. Under these conditions, it has been found that emissions outside the useful band of frequencies are negligible.

Dans le mode de réalisation de l'invention qui est représenté sur la figure 3, le dispositif émetteur comporte, comme celui représenté sur la figure 1, un transistor 30, par exemple de type MOS, sur l'électrode de commande 31 duquel sont appliqués des signaux rectangulaires. Une borne de ce transistor interrupteur 30 est reliée à la masse tandis que son autre borne est reliée à un point de connexion 32 entre une inductance primaire 34 et une inductance secondaire 36. Les inductances 34 et 36 sont constituées par des spires en série. La borne de l'inductance 34 qui est opposée à la borne 32 de jonction au transistor 30 est reliée à la borne positive (+) 38 d'une batterie d'accumulateurs dont l'autre borne est connectée à la masse.In the embodiment of the invention which is shown on the figure 3 , the transmitting device includes, like that shown on the figure 1 a transistor 30, for example of the MOS type, on the control electrode 31 to which rectangular signals are applied. One terminal of this switch transistor 30 is connected to the ground while its other terminal is connected to a connection point 32 between a primary inductance 34 and a secondary inductor 36. The inductances 34 and 36 are constituted by turns in series. The terminal of the inductor 34 which is opposite the terminal 32 of junction to the transistor 30 is connected to the positive terminal (+) 38 of a storage battery whose other terminal is connected to ground.

En outre, aux bornes de l'ensemble des deux inductances 34 et 36 en série, est disposé un condensateur 40.In addition, across the two inductors 34 and 36 in series, a capacitor 40 is arranged.

Dans le mode de réalisation représenté sur les figures 4 et 4a, les inductances 34 et 36, constituant l'antenne émettrice, sont formées à partir d'une nappe de fils 420 à 428 dans laquelle les fils 420 et 428 en ruban constituent un blindage extérieur, ces fils 420 et 428 étant à la masse et ne constituant pas des spires pour les inductances 34 et 36.In the embodiment shown on the Figures 4 and 4a , Inductors 34 and 36, constituting the transmitting antenna, are formed from a son ply 42 0-42 8 wherein the son 42 0 42 8 tape form an outer shield, these son 42 0 and 42 8 being grounded and not constituting turns for inductances 34 and 36.

Comme montré sur la figure 4a, l'inductance 34 est réalisée à partir des fils 422, 424 et 426 en parallèle et l'inductance 36 est réalisée à partir des fils formant des spires en série 421, 423, 425 et 427. Comme on peut l'observer sur les figures, les fils 422, 424 et 426 sont de chaque côté au même potentiel, à savoir une extrémité des fils est d'un côté au potentiel positif de la batterie (référence 38 sur la figure 3) et de l'autre côté, ces fils sont tous reliés au même point 32.As shown on the figure 4a the inductor 34 is made from the wires 42 2 , 42 4 and 42 6 in parallel and the inductor 36 is made from the wires forming series turns 42 1 , 42 3 , 42 5 and 42 7 . As can be seen in the figures, the wires 42 2 , 42 4 and 42 6 are on each side at the same potential, namely one end of the wires is on one side at the positive potential of the battery (reference 38 on the figure 3 ) and on the other hand, these wires are all connected to the same point 32.

Dans ces conditions, on voit que les spires en série de l'ensemble 36 sont séparées l'une de l'autre par une spire de l'inductance 34 à un potentiel de référence. On a constaté que ce montage permettait aussi de limiter les capacités et inductances parasites et permettait, dans ces conditions, des émissions négligeables en dehors de la bande de fréquences utile.In these conditions, we see that the series turns of the assembly 36 are separated from each other by a turn of inductance 34 at a reference potential. It has been found that this arrangement also makes it possible to limit parasitic capacitances and inductances and, in these conditions, allows negligible transmissions outside the useful frequency band.

Claims (7)

  1. Wire antenna for a device for transmitting periodic radio signals in a determined frequency band, this antenna comprising a set of wire coils (221-227; 421-427), said coils being able to be embedded in the roof of a motor vehicle, characterized in that said set of wire coils exhibits, inter alia, a plurality of coils (222, 224, 226, 422, 424, 426) brought to a reference potential, such as ground, each coil brought to a reference potential (222, 224, 226, 422, 424, 426, 428) being arranged respectively between two other coils (221, 223, 225, 227, 421, 423, 425, 427) of the set of wire coils.
  2. Wire antenna according to Claim 1, characterized in that the coils (221-227) are connected in series.
  3. Antenna according to Claim 2, characterized in that the coils are linked to one another by way of a printed circuit board (24).
  4. Antenna according to Claim 1, characterized in that the coils (422, 424, 426) brought to a reference potential are arranged in parallel.
  5. Antenna according to Claim 4, characterized in that the coils (422, 424, 426) brought to a reference potential and the other transmitter coils (421, 423, 425, 427) form an autotransformer.
  6. Antenna according to any one of the preceding claims, characterized in that the coils form part of a layer of wires that are joined to one another.
  7. Device for transmitting information from a vehicle to a portable object situated in the vicinity of the vehicle, this device comprising a wire antenna according to any one of Claims 4 to 6, this device being intended to transmit signals putting a controlled switch (30), such as a transistor, alternately into the on state and the off state, this device being such that, for the transmission, there is provided at least one primary transmission coil (34) and, in series with this primary coil (34), secondary coils (36) in series, the controlled switch (30) being linked to the junction (32) between the primary coil (34) and the secondary coils (36), a capacitor (40) being arranged at the terminals of the set of these coils in series, the assembly being such that, when the switch (30) is in the on state, the primary coil (34) is charged with energy, and when the switch (30) is open, this energy is supplied to the oscillating circuit formed by the set of coils in series and the capacitor (40).
EP02005623.0A 2001-03-20 2002-03-12 Antenna coil for transmitting a signal in a determined frequencies bandwidth Expired - Lifetime EP1244175B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0103742 2001-03-20
FR0103742A FR2822595B1 (en) 2001-03-20 2001-03-20 SIGNAL-EMITTING SIGNAL ANTENNA IN A FREQUENCY BAND

Publications (2)

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EP1244175A1 EP1244175A1 (en) 2002-09-25
EP1244175B1 true EP1244175B1 (en) 2018-04-11

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EP02005623.0A Expired - Lifetime EP1244175B1 (en) 2001-03-20 2002-03-12 Antenna coil for transmitting a signal in a determined frequencies bandwidth

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EP (1) EP1244175B1 (en)
FR (1) FR2822595B1 (en)

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
JP4348993B2 (en) * 2003-04-24 2009-10-21 アイシン精機株式会社 Electrical component and manufacturing method thereof

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Publication number Priority date Publication date Assignee Title
JPS6057703A (en) * 1983-09-07 1985-04-03 Matsushita Electric Ind Co Ltd Reception antenna of am receiver
JPS61196080A (en) * 1985-02-21 1986-08-30 日産自動車株式会社 Wireless user discrimination apparatus
GB8602913D0 (en) * 1986-02-06 1986-03-12 Cotag International Ltd Aerial systems
US4626816A (en) * 1986-03-05 1986-12-02 American Technical Ceramics Corp. Multilayer series-connected coil assembly on a wafer and method of manufacture
IL82025A (en) * 1987-03-27 1993-07-08 Galil Electro Ltd Electronic data communications system
DE19610284A1 (en) * 1996-03-15 1997-08-07 Siemens Ag Transponder antenna coil design

Non-Patent Citations (1)

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Title
None *

Also Published As

Publication number Publication date
FR2822595A1 (en) 2002-09-27
FR2822595B1 (en) 2005-04-08
EP1244175A1 (en) 2002-09-25

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