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EP1586135A1 - Noyau d'antenne - Google Patents

Noyau d'antenne

Info

Publication number
EP1586135A1
EP1586135A1 EP03702515A EP03702515A EP1586135A1 EP 1586135 A1 EP1586135 A1 EP 1586135A1 EP 03702515 A EP03702515 A EP 03702515A EP 03702515 A EP03702515 A EP 03702515A EP 1586135 A1 EP1586135 A1 EP 1586135A1
Authority
EP
European Patent Office
Prior art keywords
antenna
antenna core
winding
elements
core
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Withdrawn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
EP03702515A
Other languages
German (de)
English (en)
Inventor
Herbert Hein
Wulf Guenther
Harald Hundt
Achim Kipper
Matthias Reidel
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.)
Vacuumschmelze GmbH and Co KG
Original Assignee
Vacuumschmelze GmbH and Co KG
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 Vacuumschmelze GmbH and Co KG filed Critical Vacuumschmelze GmbH and Co KG
Publication of EP1586135A1 publication Critical patent/EP1586135A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H01Q7/06—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 with core of ferromagnetic material
    • H01Q7/08—Ferrite rod or like elongated core
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y25/00—Nanomagnetism, e.g. magnetoimpedance, anisotropic magnetoresistance, giant magnetoresistance or tunneling magnetoresistance
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • H01F1/153—Amorphous metallic alloys, e.g. glassy metals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • H01F1/153—Amorphous metallic alloys, e.g. glassy metals
    • H01F1/15333—Amorphous metallic alloys, e.g. glassy metals containing nanocrystallites, e.g. obtained by annealing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F10/00—Thin magnetic films, e.g. of one-domain structure
    • H01F10/08—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers
    • H01F10/10—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers characterised by the composition
    • H01F10/18—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers characterised by the composition being compounds
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F10/00—Thin magnetic films, e.g. of one-domain structure
    • H01F10/26—Thin magnetic films, e.g. of one-domain structure characterised by the substrate or intermediate layers
    • H01F10/265—Magnetic multilayers non exchange-coupled
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type
    • H01F17/04—Fixed inductances of the signal type with magnetic core
    • 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
    • H01Q7/06—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 with core of ferromagnetic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/0036—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties showing low dimensional magnetism, i.e. spin rearrangements due to a restriction of dimensions, e.g. showing giant magnetoresistivity
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type
    • H01F17/04—Fixed inductances of the signal type with magnetic core
    • H01F17/045—Fixed inductances of the signal type with magnetic core with core of cylindric geometry and coil wound along its longitudinal axis, i.e. rod or drum core
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/04—Cores, Yokes, or armatures made from strips or ribbons

Definitions

  • the invention relates to an antenna core of a length of at least '80 mm with at least one flexible soft-magnetic element of an amorphous or nanocrystalline alloy and a method for producing such aerial core method for producing an antenna and Verwen- fertil of such an antenna core.
  • EP 0554581 B1 discloses a laminated magnetic core for an antenna, which is used on an identity card or a credit card-like card and which consists of a stack of amorphous magnetic layers and film-like non-conductive layers, for example made of plastic, arranged in between.
  • the antenna shown there requires flexibility insofar as an ID card is exposed to certain mechanical loads in daily use.
  • An antenna for a transponder with a magnetic core is known from EP 0762535.
  • B1 which consists of different layers of a soft magnetic material, for example an amorphous magnetic material with or without interposed insulation layers in the form of paper or a polymer.
  • potting tapes of the magnetic active material with plastics, for example resins is also disclosed there.
  • the version described there serves to create a flexible and unbreakable antenna.
  • DE 19513607 C2 discloses a magnetic core member for a thin film antenna is known, wherein the magnetic core made of strips of an amorphous alloy or a nanocrystalline alloy, which may be isolated by insulating from each other, whereby a separation of the laminate layers is mentioned by their Ox 'films possess.
  • a package of soft magnetic elements is also known, for example, from US Pat. No. 5,567,537, in which the use of certain amorphous and nanocrystalline alloys for the production of so-called thin-film antennas is described.
  • the criterion for the good usability of such thin-film antennas is the retention of soft magnetic or other physical properties before and after a bending load.
  • the US 5625366 discloses a flexible antenna core, which consists of different layers of an amorphous alloy as a laminate, wherein a strand-like bundle of strand-shaped magnetically active bodies is additionally mentioned, between which a film insulation can be provided if necessary.
  • a film insulation can be provided if necessary.
  • the possibility is also mentioned of producing insulation of the individual elements by means of an oxide layer or another layer which can be created, for example, by chemical treatment of the magnetic elements
  • the amorphous and natural known from the cited prior art are nocrystalline alloys and especially the inner structure of the antenna cores are only suitable to a very limited extent.
  • non-deformable ferrite cores have been used in motor vehicle access systems.
  • the object is achieved in that the amorphous or nanocrystalline alloy has a magnetostriction value ⁇ s in the range from 4 * 10 "6 to -4 * 10 " ⁇ .
  • the alloy preferably has a magnetostriction value ⁇ s in the range from 1 * 10 ⁇ 6 to -l * 10 "s on.
  • Such a low magnetostriction value makes the antenna core very insensitive to bending with regard to its magnetic properties.
  • the amorphous or nanocrystalline alloy can have a linear BH loop, the inductance L of the antenna core changing at 60 kHz during a central bending by 25% of its length by less than 10%.
  • the quality can advantageously be chosen so that it is greater than 10 at 60 kHz. Quality is the ratio of inductance and resistance multiplied by the angular frequency.
  • strand-like strands can be provided as elements.
  • the elements can also be particularly advantageous for the elements to be designed as flat strips or strips which are rectangular in cross section.
  • the elongated soft magnetic strips have a thickness of 5 to 30 micrometers.
  • An antenna core can be made of the • ⁇ soft magnetic elements of considerable length (for example greater than 8, especially more than 30 cm) can be produced, which can be further processed as an independent self-supporting component to an antenna for at a suitable point in a larger device ( eg door handle) or in particular can be installed in a motor vehicle.
  • the invention can also advantageously be implemented in that the elements are separated from one another by electrically insulating films.
  • the electrically insulating films can be made of plastic, for example. It can be advantageous that the foils have a thickness of 0.5 to 30 ⁇ m.
  • the natural insulation layer on the surface of the soft magnetic alloy strips is insufficient to ensure high quality values Q and reliable resistance to deformation.
  • some soft magnetic alloy strips Due to the manufacturing process, some soft magnetic alloy strips have a surface structure that changes over the length of the strip and has, for example, elevations and depressions. Such elevations then touch the neighboring band layers and, depending on many factors, enable electrical through-plating with frequently fluctuating transition resistance.
  • plastic insulating films has proven to be advantageous in special cases, so that antenna cores can be produced which have high and very stable quality values Q.
  • This full-surface insulation between all belt layers suppresses any eddy currents between the individual belt layers.
  • the alloy strips preferably have a thickness of 5 to 30 ⁇ m.
  • the insulating foils can be omitted if certain eddy currents can be accepted.
  • the antenna cores mentioned are preferably produced by a method according to the invention, which has the following steps:
  • One or more soft magnetic elements are wound into a toroid, the wound toroid is severed at one point, opened and shaped back into the elongated antenna core.
  • the elements Before winding, the elements can also be alternately layered with insulating foils.
  • the soft magnetic elements can advantageously be produced using rapid solidification technology.
  • n times the number of tape layers are wound for each antenna core when winding the toroid. After the toroid has been cut through, a number n of packets is produced, from which n antenna cores then emerge by separating the packet in the envelope.
  • the soft magnetic properties for example permeability, shape of the BH- Loop, coercive field strength, magnetostriction etc.
  • the elements can be cut individually and, preferably in a receiving body, layered to form the antenna core.
  • the antenna core consisting of one or more soft magnetic elements is preferably stabilized in order to protect the elements and to enable the winding.
  • the antenna core can be placed between two rectangular flat bars.
  • the resulting “sandwich” can be further developed into a rod-shaped winding body by wrapping it with adhesive tapes.
  • the reshaped antenna core can also be further developed with a curable resin to form a winding body.
  • the inductance of the rod antenna is then adjusted by adapting the magnetic iron cross section A Fe of the antenna core to a winding former before stabilization by adding or removing individual band layers or sections of band layers to the inductance value that will later be necessary for the antenna ,
  • the inductance of the rod antenna can also be adjusted in that the winding of the antenna core by adding or removing individual turns to the value of the antenna which will later be necessary Inductance is adjusted. It can also be provided that by adding other soft magnetic elements, both the inductance is set and the course of the magnetic flux is designed.
  • the inductance of the antenna can be adjusted by adapting the winding of the foil package to the value of the inductance that will later be necessary for the antenna by moving the winding or individual turns in relation to the length of the antenna core.
  • the winding for the antenna to be manufactured can be made of stranded wire, wire, cable or the like.
  • the edges of the antenna core have regular depressions in which the winding wires for the antenna winding are held.
  • the distance and the position of the winding on the antenna core is clearly defined.
  • the resulting antenna package is placed between two pre-hardened and pre-hardened fiber mats, which are also called prepregs.
  • the resulting ensemble is then pressed in a heated mold into a body with free-form geometry. By curing the resin in this form, the body is finally fixed.
  • the invention also relates to the use of an antenna according to the invention in a motor vehicle. Especially Installation between a moving part of the motor vehicle (for example door) and its chassis is advantageous.
  • Figure 1 shows a basic structure of an antenna core according to the invention
  • FIG. 2 shows a completely wound antenna consisting of an antenna core according to the invention and a winding
  • FIG. 3 shows an alternative embodiment of a fully wound antenna
  • FIG. 4 shows an antenna core wound into a toroid bifilar
  • FIG. 5 shows an antenna core according to the invention produced by cutting open the toroid from FIG. 4 and then opening it
  • FIG. 6 shows a structure of an antenna core made of soft-magnetic, strand-like elements without insulating foils
  • FIG. 7 shows a two-part, angled antenna core
  • FIG. 8 shows an antenna core made of soft magnetic tapes without insulating foils
  • FIG. 9 steps in the manufacturing process of an antenna, Figure 10 and Figure 11 is a motor vehicle in outline
  • Figure 11 shows the installation of an antenna according to the invention in a motor vehicle.
  • the antenna core consists of several alternately layered elongated soft magnetic bands or strips 1 made of an amorphous or nanocrystalline alloy. If necessary, there are insulating foils 2 between the strips 1, which electrically isolate the strips 1 from one another. In conjunction with appropriate evaluation electronics, the foils can also be omitted, for example when used in a motor vehicle access system.
  • the antenna core is stabilized and fixed with some adhesive tapes 3.
  • an antenna according to the invention has an elongated antenna core 8 which is provided with a winding 4.
  • the ends 5, 6 of the winding 4 enable the supply and discharge of electrical current.
  • the elongated antenna core is provided with stiffening strips 7, which are made of plastic, placed on the bottom and top for stabilization.
  • a strip or tape is cast from an amorphous alloy by means of rapid starter technology, which is then adjusted with regard to its soft magnetic properties by means of heat treatment in a magnetic field. This is preferably done in the form of a coil.
  • the setting of the nanocrystalline structure takes place in the course of this heat treatment.
  • the amorphous alloys are usually cobalt-based alloys and the nanocrystalline alloys are usually iron-based alloys. Both alloy systems have long been known in the technical field and are described, for example, in US Pat. No. 5,567,537 cited at the beginning.
  • the alloy strips are then bifilarly wound into a toroid 11, for example together with an electrically insulating film, which preferably consists of plastic and typically has a thickness of 0.5 to 30 ⁇ m.
  • an electrically insulating film which preferably consists of plastic and typically has a thickness of 0.5 to 30 ⁇ m.
  • Each individual band layer of the amorphous or natural nocrystalline alloy strips are electrically isolated from the adjacent strip layers by the foil.
  • the completely wound toroid 11 is shown in FIG. 4.
  • this completely wound toroid is cut through at one point, opened and shaped back into the elongated antenna core 8, which is typically trapezoidal at both ends after being opened, as can be seen from FIG. 5.
  • the alloy strips used had a thickness of 23 + 3 ⁇ m.
  • the soft magnetic amorphous alloy ribbon has received a field heat treatment at a temperature of 200 ° C for about 18 hours across the ribbon direction prior to being processed into a package.
  • the resulting bra Loop is a largely linear F-loop. This results in a largely linear BH loop with a relatively small remanence ratio of ⁇ 0.3.
  • the dimensions of the antenna core produced according to the invention were:
  • the invention is particularly suitable for antennas with a length of 80 mm, in particular 300 mm, in particular for antennas of motor vehicle access systems.
  • the antenna core was provided with a winding with 110 turns of enamelled copper wire with a diameter of 0.5 mm.
  • the wound length of the antenna was approximately 700 mm centered.
  • an antenna C with identical dimensions and made of a magnetic tape with a thickness of 17 + 3 ⁇ m but without foil insulation was also produced.
  • the soft magnetic material became a antenna before being processed
  • an antenna was produced from a slightly aggressive alloy 2 from Table 1 with foil insulation (D) and without foil insulation (E).
  • the Soft magnetic amorphous alloy tape was also subjected to a field heat treatment transverse to the tape direction before being processed into a package, the heat treatment being carried out for 6 seconds at a temperature of 310 ° C. and the magnetic field being applied transverse to the tape direction. This again resulted in a largely linear flat bra loop.
  • an antenna (F) was produced from a more magnetostrictive alloy (alloy No. 3 from Table 1) with a foil insulation.
  • the soft magnetic amorphous alloy strip used was also subjected to a field heat treatment transversely to the strip direction before being processed into a package, the heat treatment being carried out for 6 seconds at a temperature of 350 ° C. transversely to the strip direction.
  • a largely linear B-H loop was again achieved.
  • examples A and D have a high inductance L which is largely independent of the deformation and at the same time high quality Q
  • comparative examples B, C, E and F have an inductance L which is sometimes more sensitive to voltage.
  • Comparative example F also showed unstable measured values and a very high sensitivity to mechanical loads.
  • an antenna pattern with a torsional load of 180 ° or a bend to a closed ring (circular shape) was measured.
  • an antenna (G) was produced from a bifilar-made package of amorphous alloy ribbons from alloy No. 1 of Table 1 with a thickness of 23 + 3 ⁇ m and a film made of the plastic Hostaphan® with a thickness of 6 ⁇ m.
  • the soft-magnetic amorphous alloy strip had been subjected to a field heat treatment transverse to the strip direction before being processed into a package, so that a largely linear flat F-loop was present.
  • the dimensions of the antenna produced were: length 750 mm,
  • the present invention accordingly makes it possible to produce antenna cores which can be subjected to excellent mechanical stress, and which are also simple and can be produced on an industrial scale.
  • FIG. 6 shows an antenna core 12, which is formed from strand-like soft magnetic elements 13 consisting of an amorphous or nanocrystalline alloy without the interposition of insulating layers.
  • This antenna core 12 has the advantage over an antenna core layered from strip-shaped strips that it is mechanically easier to bend in all directions.
  • FIG. 7 shows an antenna core 14 which is constructed in two parts, one part remaining without a winding and the second part being provided with a winding 15. This is an example of the fact that in addition to a laminate-like part, the antenna core can contain further parts for aligning or bundling the magnetic flux.
  • FIG. 8 shows an antenna core 16 which is fixed in a curved shape and which consists exclusively of a stratification of strip-shaped strips 1 with a rectangular cross section without the interposition of insulating layers.
  • the strips' 1 can on the one hand onstiken by their natural oxidation, on the other hand also by other surface layers which may for example be generated by a chemical pretreatment can be electrically separated from each other.
  • through-contacting may occur due to surface roughness of the tapes, but the eddy current losses for typical applications in the transponder range, for example, remain in the range around 125 kHz and the electronics used there are acceptable.
  • FIG. 9 shows a method for producing an antenna core, in which the strips 1 are first inserted one after the other into a mold 17 which is designed as an open frame.
  • This frame can in turn have a thin frame.
  • a winding 18 can be applied thereon, which can be wound up, for example, in notches which are arranged on the outer edges of the frame 17.
  • the intermediate product formed in this way can be glued, cast or wrapped with bandages and then a shrink tube 19 can be pulled over and shrunk on.
  • the shrink tube is shown in the shrunk-on form.
  • the ends 20, 21 of the antenna core are pressed flat and wide by means of an embossing with a pressing tool, as a result of which the shrink tube can also be tightly connected at the ends to the inner part of the antenna core.
  • the ends of the shrink tube can also be coated on the inside with an adhesive, for example a hot glue, which allows a tight connection with the parts of the antenna core to be enclosed.
  • connections 22, 23 of the antenna core are fastened on the frame 17 and serve for fastening and contacting the two ends of the winding 18. There, a line can be connected which emerges from the shrink tube at the end 21.
  • additional soft magnetic parts can also be provided that certain soft magnetic parts are already integrated in the frame 17 as a kind of pole shoes before the strips 1 are inserted, or that the frame 17 already consists entirely of a soft magnetic material.
  • the frame 17 can also exist in a three-dimensionally curved shape before the strips 1 are inserted, or can be bent together with the strips after the strips have been inserted to form the intended three-dimensional form.
  • FIG. 10 shows a motor vehicle 24 in which an antenna 25 for a transponder is integrated in the area of the right passenger door. As shown, the antenna extends from the door handle 26 to a flashing light 27, in the vicinity of which the body of the motor vehicle is broken, so that one end of the antenna is also made of metal
  • Outer skin of the motor vehicle can leak.
  • a corresponding antenna can be attached in the area of the tailgate 28 or the bonnet 29 or a rear door. organize. In the area of the tailgate, the antenna can then emerge from the tailgate handle on the one hand and from the rear window, in the area of the bonnet it can exit from the front bonnet edge on the one hand and in the area of the windscreen on the other. In this way, a large antenna length is achieved in each case, the antenna ends projecting out of the metallic outer skin of the vehicle, however, the bendability of the antenna which is possible according to the invention while maintaining full functionality is also a prerequisite when the door is opened.
  • FIG. 11 shows a view of the motor vehicle of FIG. 10 from above, the antenna 25 being shown in a stretched form with the passenger door closed.
  • FIG. 12 shows an enlarged view of the area in which the antenna 27 is located. 28 there denotes an area in which the antenna is not provided with a winding, which essentially serves to guide the magnetic flux.
  • a plurality of antennas according to the invention can also be provided on a motor vehicle of the type shown in order to realize a larger transmission / reception range or to be sensitive to different orientations of the magnetic field.
  • the antenna cores according to the present invention can be used in motor vehicles, for example also use in detection systems for anti-theft systems as the transmitting and / or receiving antennas.
  • detection systems for anti-theft systems are described for example in EP 0 121 649 B2 or US 4, 150, 981.
  • applications are also conceivable, in particular as stationary antennas for personal registration and / or in billing systems (for example stationary antennas for the identification and billing of ski passes).

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Electromagnetism (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Nanotechnology (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Soft Magnetic Materials (AREA)
  • Support Of Aerials (AREA)

Abstract

L'objectif de l'invention est de créer un noyau d'antenne (8) qui soit hautement flexible, en particulier pour des systèmes d'identification haute fréquence, et qui conserve sensiblement ses propriétés magnétiques douces en cas de déformation. A cet effet, le noyau d'antenne (8) selon l'invention est réalisé dans des alliages amorphes ou nanocristallins spécifiques présentant une valeur de magnétostriction particulièrement faible et il se présente sous la forme d'un stratifié avec ou sans couches isolantes intercalaires. L'invention concerne en outre une antenne pourvue d'un tel noyau, ainsi qu'un procédé de production associé.
EP03702515A 2003-01-23 2003-01-23 Noyau d'antenne Withdrawn EP1586135A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2003/000699 WO2004066438A1 (fr) 2003-01-23 2003-01-23 Noyau d'antenne

Publications (1)

Publication Number Publication Date
EP1586135A1 true EP1586135A1 (fr) 2005-10-19

Family

ID=32748749

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03702515A Withdrawn EP1586135A1 (fr) 2003-01-23 2003-01-23 Noyau d'antenne

Country Status (4)

Country Link
US (1) US7508350B2 (fr)
EP (1) EP1586135A1 (fr)
JP (1) JP4238221B2 (fr)
WO (1) WO2004066438A1 (fr)

Cited By (2)

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EP2278661A4 (fr) * 2008-04-25 2017-08-30 Toda Kogyo Corporation Antenne magnétique, substrat présentant l'antenne magnétique montée sur celui-ci, et étiquette radiofréquence
CN113725621A (zh) * 2020-05-26 2021-11-30 普莱默股份公司 远程低频天线

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JP4152845B2 (ja) * 2003-09-22 2008-09-17 株式会社アルファ アンテナ装置および該アンテナ装置を装着した自動車のドアアウトサイドハンドル装置
JP4574155B2 (ja) * 2003-10-10 2010-11-04 中川特殊鋼株式会社 磁気コアおよびその用途
EP1679727A4 (fr) * 2003-10-23 2015-02-25 Toshiba Kk Dispositif inductif et procede de fabrication associe
DE102004037682A1 (de) * 2004-08-02 2006-03-16 Huf Hülsbeck & Fürst Gmbh & Co. Kg Sendeantennenanordnung zum Abstrahlen eines langwelligen Aufwecksignals für einen ID-Geber eines schlüssellosen Kraftfahrzeugzugangssystems
JP2006242940A (ja) * 2005-02-02 2006-09-14 Seiko Instruments Inc 電波時計
DE102005015006B4 (de) * 2005-04-01 2013-12-05 Vacuumschmelze Gmbh & Co. Kg Magnetkern
US8072387B2 (en) * 2005-07-07 2011-12-06 Toda Kogyo Corporation Magnetic antenna and board mounted with the same
JP5226178B2 (ja) * 2005-09-13 2013-07-03 株式会社スマート 金属埋込センサシステム
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US20060022886A1 (en) 2006-02-02

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