EP1317017A1 - Dispositif d'antenne pour générer un champ magnétique quasi-isotropique - Google Patents

Dispositif d'antenne pour générer un champ magnétique quasi-isotropique Download PDF

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Publication number
EP1317017A1
EP1317017A1 EP01128715A EP01128715A EP1317017A1 EP 1317017 A1 EP1317017 A1 EP 1317017A1 EP 01128715 A EP01128715 A EP 01128715A EP 01128715 A EP01128715 A EP 01128715A EP 1317017 A1 EP1317017 A1 EP 1317017A1
Authority
EP
European Patent Office
Prior art keywords
antenna
secondary winding
antenna arrangement
loop
loop antenna
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.)
Withdrawn
Application number
EP01128715A
Other languages
German (de)
English (en)
Inventor
Alfred Lauper
Daniel Saxer
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.)
Continental Automotive Switzerland AG
Original Assignee
Siemens Transit Telematic Systems AG
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 Siemens Transit Telematic Systems AG filed Critical Siemens Transit Telematic Systems AG
Priority to EP01128715A priority Critical patent/EP1317017A1/fr
Priority to PCT/EP2002/011032 priority patent/WO2003049230A1/fr
Publication of EP1317017A1 publication Critical patent/EP1317017A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/29—Combinations of different interacting antenna units for giving a desired directional characteristic
    • 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
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/02—Coils wound on non-magnetic supports, e.g. formers
    • H01F2005/027—Coils wound on non-magnetic supports, e.g. formers wound on formers for receiving several coils with perpendicular winding axes, e.g. for antennae or inductive power transfer

Definitions

  • the present invention relates to an antenna arrangement for Generation of a quasi-isotropic magnetic field according to the generic term of claim 1.
  • Antenna arrangements are required, which usually consist of three to each other orthogonal frame or ring antennas or dipole antennas consist.
  • Such paired orthogonal antenna arrangements are e.g. disclosed in US 5,258,766 (Murdoch, Nov. 2, 1993) or in WO 01/73888 A1 (Teratron GmbH, Oct. 4. 2001).
  • the present invention is therefore based on the object to specify an antenna arrangement with respect to the dimensioning easily in a space between interior and External ceiling can be installed, creating a quasi-isotropic Magnetic field allowed and easy to manufacture is.
  • each loop antenna is formed from a primary winding and a secondary winding; this results in easy assembly and, through a capacitive and inductive coupling of the two windings, more magnetic energy can be generated by the antenna arrangement.
  • FIG. 1 shows the floor plan of an embodiment of the antenna arrangement 1 according to the invention.
  • the antenna arrangement 1 is formed from three loop antennas 11, 12 and 13, the planes of which are each orthogonal to one another in pairs.
  • Each of the loop antennas 11, 12, and 13 has a groove or groove 11 R , 12 R , and 13 R , which is provided for receiving a primary and secondary winding made of lacquered, ie insulated Cu wire.
  • the cross sections of the loop antennas 11, 12 and 13 - see Figures 1 and 2 - are elliptical with a semi-axis ratio a: b, which is of the order of magnitude of preferably 2: 1.
  • the planes of these ellipses are orthogonal in pairs.
  • This orthogonality is indicated at one point as shown in FIG. 2 with the specification 90 °.
  • the corners / edges between the planes of two loop antennas are either rounded, as shown by the arrow 4 in FIG. 1. It is also possible to provide these corners / edges with a narrow strip that has an angle of 45 ° with respect to the planes.
  • two connection tabs 21, 22 and 23 are provided for the primary winding 17, 18 and 19 of each frame antenna 11, 12 and 13.
  • a threaded hole 3 is provided for fastening the antenna arrangement 1 or the antenna carrier 2.
  • This antenna arrangement 1 is primarily intended for installation on or above a visible ceiling of an entry zone for the detection of electronic tickets.
  • the axis of the threaded hole 3 is oriented vertically in the operating state.
  • another hole can also be provided for the attachment, for example with a slightly conical shape for a press fit.
  • FIG. 2 shows a perspective view of the antenna arrangement 1 from “obliquely below”, this view “obliquely below” relates to the position of the antenna arrangement in the operational state.
  • the above-mentioned secondary windings 17, 18 and 19 are "open".
  • a hole is provided next to a groove 11 R , 12 R , and 13 R for assembly.
  • one end of each secondary winding 17, 18 and 19 is fixed in the hole in question, and after the winding has taken place, the other end is fastened to the respective fixation notch 31, 32 and 33.
  • the fixation notches 31, 32 and 33 can also be designed in such a way that they have a bolt formed by two notches, around which the copper wire can be wound with one turn and can thus be fixed.
  • both ends of a secondary coil can also be attached to the same fixation notch 31, 32 or 33.
  • the antenna carrier 2 is in one piece.
  • the symmetrical shape of the antenna carrier 2 makes it easier to design it as an injection molded part.
  • Plastic for example acrylonitrile-butadiene-styrene, abbreviated ABS, is preferably used as the injection molding material.
  • ABS acrylonitrile-butadiene-styrene
  • the rotationally symmetrical radiation properties also result in an adjustment being omitted in the final assembly of such an antenna arrangement 1 in a vehicle.
  • FIG. 3 shows the equivalent circuit diagram of a loop antenna with the reference symbols 17 Lp , 17 Ls , 17 R and 17 C ;
  • the following information relates to each loop antenna, since these must be identical in electrical terms to generate a quasi-isotropic magnetic field.
  • the number of turns 1 (one) is provided for the primary winding, while the secondary winding has a number of turns of preferably 5 to 25, depending on the area of use.
  • the connection tabs 21 are connected to a transmission unit, this transmission unit generating a separate transmission signal for each loop antenna, which are each shifted by 90 ° from one another.
  • the resulting magnetic field is used to transmit data to the electronic tickets by modulation.
  • an inductance 17 Lp is shown for the primary winding.
  • this antenna arrangement is preferably provided for the permitted frequencies 6.78, 13.56 or 27.1 MHz, there is predominantly a magnetic coupling between the primary and secondary windings.
  • a capacitance 17 C and an ohmic resistor 17 R must be recorded in the equivalent circuit diagram because of the above-mentioned frequencies for the secondary winding.
  • the capacitance 17 C between the turns of the secondary winding can be assigned.
  • two open ends are shown, which are actually superfluous in the equivalent circuit diagram. Seen electrically, a so-called parallel oscillation is formed by this equivalent circuit diagram.
  • the antenna arrangement can be designed in a simple manner for a specific application. From the point of view of an assigned transmission unit, an optimal adaptation in the direction of the primary winding is achieved and there is no need for time-consuming adjustment on the part of an assigned transmission unit. A number of turns greater than 1 (one) can also be used for the primary winding.
  • the invention is not based on that described above Embodiment limited.
  • the loop antenna can be used instead an elliptical shape also have an oval shape.

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  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Details Of Aerials (AREA)
EP01128715A 2001-12-03 2001-12-03 Dispositif d'antenne pour générer un champ magnétique quasi-isotropique Withdrawn EP1317017A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP01128715A EP1317017A1 (fr) 2001-12-03 2001-12-03 Dispositif d'antenne pour générer un champ magnétique quasi-isotropique
PCT/EP2002/011032 WO2003049230A1 (fr) 2001-12-03 2002-10-02 Ensemble antennes pour creer un champ magnetique quasi isotrope

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01128715A EP1317017A1 (fr) 2001-12-03 2001-12-03 Dispositif d'antenne pour générer un champ magnétique quasi-isotropique

Publications (1)

Publication Number Publication Date
EP1317017A1 true EP1317017A1 (fr) 2003-06-04

Family

ID=8179430

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01128715A Withdrawn EP1317017A1 (fr) 2001-12-03 2001-12-03 Dispositif d'antenne pour générer un champ magnétique quasi-isotropique

Country Status (2)

Country Link
EP (1) EP1317017A1 (fr)
WO (1) WO2003049230A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3030901A1 (fr) * 2014-12-22 2016-06-24 Keolabs Antenne de mesure de champ magnetique

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3440542A (en) * 1965-03-09 1969-04-22 Gautney & Jones Communications Omnidirectional loop antenna
US5084699A (en) * 1989-05-26 1992-01-28 Trovan Limited Impedance matching coil assembly for an inductively coupled transponder
DE19533105A1 (de) * 1995-04-11 1996-10-17 Kyung Chang Ind Co Hochempfindliche, ungerichtete Schleifenantennenanordnung, die geeignet ist für eine Verwendung in einem Kraftfahrzeug
EP1014596A1 (fr) * 1998-12-21 2000-06-28 Valeo Securite Habitacle Dispositif de communication basse fréquence par couplage magnétique
WO2001041319A1 (fr) * 1999-12-02 2001-06-07 Electromagnetic Instruments, Inc. Antenne a composants de champ destinee a une diagraphie de forage par induction

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3440542A (en) * 1965-03-09 1969-04-22 Gautney & Jones Communications Omnidirectional loop antenna
US5084699A (en) * 1989-05-26 1992-01-28 Trovan Limited Impedance matching coil assembly for an inductively coupled transponder
DE19533105A1 (de) * 1995-04-11 1996-10-17 Kyung Chang Ind Co Hochempfindliche, ungerichtete Schleifenantennenanordnung, die geeignet ist für eine Verwendung in einem Kraftfahrzeug
EP1014596A1 (fr) * 1998-12-21 2000-06-28 Valeo Securite Habitacle Dispositif de communication basse fréquence par couplage magnétique
WO2001041319A1 (fr) * 1999-12-02 2001-06-07 Electromagnetic Instruments, Inc. Antenne a composants de champ destinee a une diagraphie de forage par induction

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3030901A1 (fr) * 2014-12-22 2016-06-24 Keolabs Antenne de mesure de champ magnetique

Also Published As

Publication number Publication date
WO2003049230A1 (fr) 2003-06-12

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