EP1244175B1 - Antennenspule um Signale in einem bestimmten Frequenzband zu senden - Google Patents

Antennenspule um Signale in einem bestimmten Frequenzband zu senden 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
Authority
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
Other languages
English (en)
French (fr)
Other versions
EP1244175A1 (de
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
Original Assignee
Valeo Securite Habitacle SAS
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 SAS filed Critical Valeo Securite Habitacle SAS
Publication of EP1244175A1 publication Critical patent/EP1244175A1/de
Application granted granted Critical
Publication of EP1244175B1 publication Critical patent/EP1244175B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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.

Landscapes

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

Claims (7)

  1. Drahtantenne für eine Vorrichtung zum Senden von periodischen Funksignalen in einem bestimmten Frequenzband, wobei diese Antenne eine Anordnung von Drahtwindungen (221 - 227; 421 - 427) umfasst, wobei diese Windungen geeignet sind, in das Dach eines Kraftfahrzeugs eingebettet zu werden, dadurch gekennzeichnet, dass die Anordnung von Drahtwindungen unter anderem mehrere Windungen (222, 224, 226, 422, 424, 426) aufweist, die an ein Referenzpotential wie etwa Masse gelegt sind, wobei jede an ein Referenzpotential gelegte Windung (222, 224, 226, 422, 424, 426, 428) jeweils zwischen zwei anderen Windungen (221, 223, 225, 227, 421, 423, 425, 427) der Anordnung von Drahtwindungen angeordnet ist.
  2. Drahtantenne nach Anspruch 1, dadurch gekennzeichnet, dass die Windungen (221 - 227) in Reihe geschaltet sind.
  3. Antenne nach Anspruch 2, dadurch gekennzeichnet, dass die Verbindung der Windungen miteinander über eine Platte (24) vom Typ einer gedruckten Schaltung erfolgt.
  4. Antenne nach Anspruch 1, dadurch gekennzeichnet, dass die an ein Referenzpotential gelegten Windungen (422, 424, 426) parallelgeschaltet sind.
  5. Antenne nach Anspruch 4, dadurch gekennzeichnet, dass die an ein Referenzpotential gelegten Windungen (422, 424, 426) und die anderen Sendewindungen (421, 423, 425, 427) einen Autotransformator bilden.
  6. Antenne nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Windungen Bestandteil einer Lage von Drähten sind, die fest miteinander verbunden sind.
  7. Vorrichtung zum Senden von Informationen eines Fahrzeugs an ein tragbares Objekt, das sich in der Nähe des Fahrzeugs befindet, wobei diese Vorrichtung eine Drahtantenne nach einem der Ansprüche 4 bis 6 umfasst, wobei diese Vorrichtung dazu bestimmt ist, Signale zu übertragen, die einen gesteuerten Schalter (30) wie etwa einen Transistor abwechselnd in einen leitenden und in einen gesperrten Zustand versetzen, wobei diese Vorrichtung so beschaffen ist, dass zum Senden wenigstens eine primäre Sendewindung (34) vorgesehen ist, und, in Reihe mit dieser primären Windung (34), in Reihe geschaltete sekundäre Windungen (36), wobei der gesteuerte Schalter (30) mit der Verbindungsstelle (32) zwischen der primären Windung (34) und den sekundären Windungen (36) verbunden ist, wobei ein Kondensator (40) an den Klemmen der Anordnung dieser in Reihe geschalteten Windungen angeordnet ist, wobei die Schaltung so beschaffen ist, dass, wenn der Schalter (30) leitend ist, die primäre Windung (34) sich mit Energie auflädt, und wenn der Schalter (30) geöffnet ist, diese Energie an den Schwingkreis abgegeben wird, der aus der Anordnung der in Reihe geschalteten Windungen und dem Kondensator (40) besteht.
EP02005623.0A 2001-03-20 2002-03-12 Antennenspule um Signale in einem bestimmten Frequenzband zu senden Expired - Lifetime EP1244175B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0103742A FR2822595B1 (fr) 2001-03-20 2001-03-20 Antenne a spires emettrices de signaux dans une bande determinee de frequences
FR0103742 2001-03-20

Publications (2)

Publication Number Publication Date
EP1244175A1 EP1244175A1 (de) 2002-09-25
EP1244175B1 true EP1244175B1 (de) 2018-04-11

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP02005623.0A Expired - Lifetime EP1244175B1 (de) 2001-03-20 2002-03-12 Antennenspule um Signale in einem bestimmten Frequenzband zu senden

Country Status (2)

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EP (1) EP1244175B1 (de)
FR (1) FR2822595B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4348993B2 (ja) * 2003-04-24 2009-10-21 アイシン精機株式会社 電気部品及びその製造方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6057703A (ja) * 1983-09-07 1985-04-03 Matsushita Electric Ind Co Ltd Ａｍ受信機の受信アンテナ
JPS61196080A (ja) * 1985-02-21 1986-08-30 日産自動車株式会社 無線式利用者識別装置
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 (de) * 1996-03-15 1997-08-07 Siemens Ag Antennenspule

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

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

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