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EP2529447A1 - Noyau d'antenne, antenne et procédés de fabrication d'un noyau d'antenne et d'une antenne - Google Patents

Noyau d'antenne, antenne et procédés de fabrication d'un noyau d'antenne et d'une antenne

Info

Publication number
EP2529447A1
EP2529447A1 EP11702603A EP11702603A EP2529447A1 EP 2529447 A1 EP2529447 A1 EP 2529447A1 EP 11702603 A EP11702603 A EP 11702603A EP 11702603 A EP11702603 A EP 11702603A EP 2529447 A1 EP2529447 A1 EP 2529447A1
Authority
EP
European Patent Office
Prior art keywords
antenna
antenna core
layers
band
core 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.)
Ceased
Application number
EP11702603A
Other languages
German (de)
English (en)
Inventor
Johannes Binkofski
Markus Brunner
Klemens Trabold
Ralf Koch
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 EP2529447A1 publication Critical patent/EP2529447A1/fr
Ceased 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
    • 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
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/04—Cores, Yokes, or armatures made from strips or ribbons
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • H01F41/0213—Manufacturing of magnetic circuits made from strip(s) or ribbon(s)
    • H01F41/0226—Manufacturing of magnetic circuits made from strip(s) or ribbon(s) from amorphous ribbons
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/06—Coil winding
    • H01F41/077—Deforming the cross section or shape of the winding material while winding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H01Q1/2216—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in interrogator/reader equipment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49016—Antenna or wave energy "plumbing" making

Definitions

  • the invention relates to antenna cores and antennas, as used in recognition systems, eg in keyless entry systems (Keyless Entry Systems). Used are those Erken ⁇ recognition systems can be used in a variety of technical Gebie- th. Only exemplified are locking systems in the automotive sector, access control systems for security-related areas, etc.
  • the antenna cores or antennas serve as transmitting antennas for generating a magnetic field.
  • the antennas are usually operated in a resonant resonant circuit, which is tuned by adapting a series capacitance and / or a series resistance to the impedance of the antenna arrangement at the desired transmission frequency. In this case, antennas with the highest possible quality are usually used, which, however, requires a great deal of effort for the tuning of the resonant circuit.
  • such a transmitting antenna can be constructed with a ferrite bar core of any cross-section.
  • the object of the present invention is therefore to provide an antenna core and an antenna which are mechanically flexible. In addition, these antennas should allow a sufficiently high transfer efficiency and a sufficiently high transmission field strength at the same time easier coor ⁇ tion of the resonant oscillating circuit.
  • an antenna core according to claim 1 by a method for producing an antenna core according to claim 14, by an antenna according to claim 18 or by a method for producing an antenna according to claim 20.
  • Embodiments and developments of the invention are the subject of dependent claims.
  • An antenna core comprises a plurality of layers of a continuous magnetic tape and has an elongated shape.
  • the magnetic tape comprises a soft magnetic alloy having an amorphous or nanocrystalline structure.
  • the antenna core has two spaced end portions, which are arranged in ge ⁇ curved portions of the tape.
  • Each of the layers is connected to at least one of the two end regions by ei ⁇ NEN such a curved portion with another of the layers, wherein the curved portion with the two La ⁇ purposes which it connects, is integrally formed. If such an antenna core is arranged inside an electrical coil, a flexible antenna results.
  • One aspect of the invention consists in the fact that the individual band layers of the antenna core are not insulated from each other, but that exist at the ends of the antenna core electrically conductive connections between the layers.
  • an antenna core can be effected, for example, by forming a continuous strip of a soft magnetic alloy which has an amorphous or a nanocrystalline structure to form a wound body with several windings is wound. The innermost of these windings has two opposing sections which come to lie after the flattening of the winding body to each other. When flattening arise from the windings, the layers of the antenna core.
  • an electric coil is formed, in which the antenna core is arranged.
  • the antenna core and the coil together form an antenna.
  • Fig. 1 is a side view of a magnetic
  • FIG. 2 is an enlarged fragmentary view of the view of FIG. 1, showing the right end portion of the antenna core;
  • FIG. 3 shows a winding body of a magnetic band from which the antenna core shown in FIG. 1 is produced
  • FIG. 4 shows a side view of an antenna produced on the basis of the antenna core according to FIG. 1;
  • FIG. 5 shows a diagram which, for various alloy compositions of an antenna formed according to FIG. 4, indicates the strength of the magnetic field which can be achieved at a specific distance from the antenna under predetermined boundary conditions;
  • Fig. 6 is a diagram showing saturation behavior for various alloy compositions of an antenna core formed in accordance with Fig. 1;
  • FIG. 7 shows an antenna core according to FIG. 1 during the
  • Fig. 8 is a side view of a based on the transformants ⁇ nenkern FIG. 7 manufactured antenna.
  • Figure 1 shows an antenna core 10 having an elongate shape and having a length L10 in its longitudinal direction.
  • the antenna core 10 is made of a long, flat, soft magnetic alloy ribbon 2 having an amorphous or nanocrystalline structure.
  • the soft magnetic alloy can be produced, for example, by means of a rapid solidification process.
  • the thickness of the tape 2 may be, for example, 10 ym to 30 ym.
  • the antenna core 10 comprises a plurality of layers 22 stacked to form a layer stack 24 and each formed by a section of the continuous strip 2.
  • the use of multiple layers 22 results in a high flexibility of the antenna core 10 in the direction in which the layers 22 are stacked.
  • the antenna core 10 can also be used, for example, in curved receiving regions.
  • each of the layers 22 in ⁇ we sentlichen is flat.
  • the height h24 which the layer stack 24 comprises is also referred to below as the stack height h24.
  • the stack height h24 is determined between two end regions 11 and 12 of the antenna core 10 which are spaced apart from one another in the longitudinal direction of the antenna core 10, so that the stack height h24 is substantially equal to the product of the number of layers 22 of the layer stack 24 and the thickness d2 of the belt 2.
  • the end regions 11, 12 are characterized in that in each case a plurality of curved portions 23 of the band 2 are arranged successively.
  • Each of the plies 22 is on at least one of the end regions 11, 12 connected by a GE ⁇ curved portions 23 with a different position 22nd In this case, the curved portion 23, which connects the two relevant ⁇ fenden layers together, integrally formed therewith.
  • each of the layers 22 disposed between two other layers 22 and has to each of these other two layers 22 a distance d22, which is smaller than the strip thickness of the soft magnetic strip used to produce the stack. Since adjacent layers 22 are directly adjacent and generally in contact, the distance is normally zero.
  • Al ⁇ lerdings can be located and gaseous inclusions between adjacent layers 22, for example from the gas of the antenna core 10, ambient atmosphere, or inclusions of a solid which was placed specifically between certain layers 22, for example to allow a mounting of the antenna core, so adjacent layers 22 are locally spaced from each other. Such gas inclusions can be caused, for example, by an unavoidable waviness of the band 2.
  • each layer 22 selectively through a dielectric to insulate against each other to eddy current losses to vermei ⁇ .
  • a dielectric may, for example, be a foil or an oxide layer formed on the surface of the band 2.
  • Figure 2 shows an enlarged view from the right end of the antenna core 10 shown in Figure 1 with the end portion 12.
  • the thickness of the band 2 is denoted by d2.
  • the curved sections 23 arranged in the end region 12 each have a radius of curvature r23 at at least one point.
  • the radius of curvature r23 of at least one of the curved portions 23 at at least one point may be smaller than the tenfold strip thickness of the one for production
  • the radius of curvature r23 of each of the curved portions 23 at each at least one location may be smaller than five times the value resulting from the stacking height of the antenna rod.
  • a method of manufacturing such an antenna core 10 will be exemplified.
  • a bobbin 20 is first prepared with a number N25 turns 25 by the tape 2 on a cylindrical or cylindrical tubular portion of a bobbin (not shown) is wound.
  • the inner diameter of the wound body 20 produced in this way is denoted d20.
  • the winding body 20 is removed from the bobbin and clamped between plane-parallel sides 51s, 52s of two metal plates 51 and 52 and pressed flat under the action of a force acting on the metal plates 51, 52 force F, so that a long rod is formed, the 1 th ge Office ⁇ th antenna core 10 forms.
  • the later end regions 11 and 12 are likewise shown in FIG.
  • the direction of movement of the end portions 11, 12 during the forming of the winding body 20 is indicated by two unfilled arrows.
  • the number N22 of the layers 22 of the finished antenna core 10 is either equal to 2 ⁇ N25 or equal to 2 ⁇ N25 + 1, depending on exactly where the beginning 221 and the end 222 of the tape 2 come to lie.
  • an antenna 30, as shown by way of example in FIG. 4 is produced by wrapping the antenna core 10 with a wire 4.
  • the wire 4 then forms a coil 40, in which the antenna core 10 is arranged.
  • the wire 4 can be, for example, an enameled wire, in which the lacquer at the ends 41, 42 of the coil 40 is removed in order to allow electrical contacting of the coil 40 and thus of the antenna 30.
  • the strip 2 can consist of a soft-magnetic material which, besides commercial impurities in the raw materials or the melt, essentially comprises the alloy composition
  • Volume 2 became a flat one
  • Band 2 with a width of 12 mm, a thickness d2 of 21 ym and a nominal composition FeSi ⁇ Bg used.
  • the number of turns N25 of the turns 25 of the wound body 20 produced from this band 2 was 15 with a diameter d20 of the wound body 20 of 75 mm.
  • the number N22 of the layers 22 of the antenna core 10 (see FIG. 1) formed after the forming of the wound body 20 was 31.
  • this antenna core 10 was subjected to a heat treatment in high-purity hydrogen at a temperature of 450 ° C for 3 hours.
  • the antenna core 10 obtained following this heat treatment had a maximum material permeability of 31,000 and a remanence ratio Br / Bs> 0.5.
  • the remanence ratio indicates the ratio of remanence Br to saturation induction Bs.
  • a further embodiment is based on a Legie ⁇ approximate composition which apart from conventional impurities of the raw materials or the melt in essentially the composition
  • M comprises at least one of the elements V, Nb, Ta, Ti, Mo, W, Zr and Hf.
  • Z comprises at least one of the Ele ⁇ elements P, Ge, and C.
  • X can consist of cobalt, or of Ni ⁇ ckel, or but from a mixture of cobalt and nickel.
  • the soft magnetic tape 2 used had a width of 12.3 mm and a thickness d2 of 19.5 ym.
  • a einstündi ⁇ ge ripening at a temperature of 558 ° C was chosen in the present Example 2.
  • a magnetostriction X s in the range from 0 ppm to 0.2 ppm and simultaneously a maximum permeability of 285,000 and a remanence ratio Br / Bs> 0.5 were established.
  • Example 3 In a further embodiment of the invention is used as an alloy magnetic material, which has the following together ⁇ men acid: Co a (Fe 1 -x Mn x ) b Ni c X d Si e B f C g wherein X is at least one of the group V, Nb, Ta, Cr, Mo, W Ge and P.
  • the parameters a, b, c, d, e, f, g are given in atom%.
  • Width of the belt 2 was 10 mm, its thickness d2 was 20.5 ym.
  • the number N25 of the windings 25 of the winding body 20 was 20, the number N22 of the layers 22 of the antenna core 10 was 41.
  • the inner diameter d20 of the winding body 20 was again 75 mm.
  • the winding body 20 (FIG. 3) was first subjected to a heat treatment at a temperature of 365 ° C. for a period of 4 hours. During the heat treatment was in the
  • Heat treatment chamber generates a DC magnetic field by means of ei ⁇ ner surrounding the heat treatment chamber magnetizing coil.
  • the orientation of the DC field was parallel to the Wi ⁇ ckelachse of the bobbin 20, ie relative to Figure 3 perpendicular to the plane.
  • the magnetic material of the wound body 20 was magnetized to magnetic saturation.
  • the winding body 20 magnetized in this way was then shaped into an elongate antenna core 10 according to FIG. 1 and used in this state to stabilize the desired shape of the antenna core 10 in an injection molded housing made of polyamide.
  • the finished at ⁇ antenna core 10 had a maximum material permeability of 1600 and a remanence ratio Br / Bs ⁇ 0.3.
  • field strengths of 45 nT were achieved at a frequency of 125 kHz and a modulation of 120 ampere turns at a distance of 1 m.
  • the antenna quality at this frequency was ⁇ 32.
  • the middle graph in Figure 5 shows the variation of the achieved at one meter distance from the antenna 30 field strength as a function of the off ⁇ control at a frequency of 125 kHz.
  • FIG. 6 shows the saturation behavior for each of the three antennas 10 explained in the examples 1, 2 and 3.
  • the inductance is plotted as a function of coil current.
  • the flattening for producing an antenna core 10 may be performed using metal plates 51, 52 whose length is less than the length L10 of the flattened antenna core 10, as shown in FIG. This ensures that the flattening of the antenna core 10 takes place only between its end regions 11 and 12, but outside of these. Thus, the antenna core 10 after the flattening on a constriction.
  • At least one of the curved portions 23 may have a radius of curvature r23 smaller than five times or twice or simply the stack height d24 of the tape (2).
  • FIG. 8 shows a finished antenna 30 in that an antenna core 10 according to FIG. 7 has been wound with a wire 4, as has been explained with reference to the antenna 30 shown in FIG.
  • the wrapping can be done so that the coil 40 is arranged only in the constricted portion of the antenna core 10 ⁇ .
  • the proposed type of rod antenna based on magnetic materials having very different properties in terms of maximum permeability and magnetostriction can produce transmission antennas which are extremely inexpensive because of the small number and simplicity of the required processing steps and effi ⁇ cient can be produced.
  • the increased by the metallically conductive compound at the ends 11, 12 of the antenna rod 30 Ummagnetmaschineshnee put in appli ⁇ conditions, which are operated pulsed, no disadvantage. It was observed that the tuning of the circuit during operation of the antenna 30 in a resonant Drive circuit is facilitated by the increased antenna impedance and that due to the reduced antenna quality, a wider frequency band is available.
  • an antenna 30 By means of an antenna 30, as described herein and explained in detail with reference to Examples 1 to 3 can be an initially-mentioned keyless realize To ⁇ gear system or any other communication system, wherein a first communication partner and a second communication partner to communicate with each other eg.
  • a Mag ⁇ netfeld in a predetermined frequency range for example, 9 kHz to 300 kHz, generated by a transmitting antenna, which is formed according to a vo ⁇ rangehend described antenna 30 and which is part of the first communication partner, generated at a distance of a few meters.
  • tern is detected by a receiving antenna that is part of ⁇ the second communication partner.
  • the communication part ner each having a different antenna, which is matched to the walls ⁇ ren frequency range.
  • the antenna described in this application therefore has the primary task of generating a magnetic field in the kHz range. This provides significant rationalization and saving measures in the manufacture of the antenna and in the selection of the usable magnetic materials. If energy is to be saved, the antenna can not only be pulsed continuously, but also alternatively.
  • a further advantage of the invention may arise when an antenna with an antenna core formed according to the present invention is operated in mobile use.
  • conventional keyless entry systems especially in the automotive sector for example it is common to use several short ferrite in a vehicle to the entire region of space around the vehicle sufficientlylockde ⁇ CKEN.
  • the ferrite cores of these short antennas each have a length in the range of about 8 cm. Larger antennas with significantly longer ferrite cores are problematic because of their high breaking sensitivity, especially in mobile use. Instead, if antennas with antenna cores according to the present invention are used within a vehicle, they may have significantly longer lengths compared to the ferrite cores mentioned above.
  • the transmission power of the individual antennas may be in particular increased and, consequently, the required space for a sufficient number of antennas ⁇ cover of a vehicle can be reduced.
  • the length L3 of an antenna core 10 according to the present invention for example, be greater than or equal to 150 mm, or greater than or equal to 200 mm. In principle, even larger lengths L3 of up to 500 mm or more than 500 mm are possible. However, shorter antenna cores 10 with lengths of less than 150 mm can also be realized. Regardless of their length L3, antennas 30 or antenna cores 10 according to the present invention can be used. not only in the automotive or mobile sector, but also in stationary operation.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Dispersion Chemistry (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

L'invention concerne un noyau d'antenne (10), une antenne (30) pourvue d'un noyau d'antenne (10) et des procédés de fabrication d'un noyau d'antenne (10) et d'une antenne (30). Le noyau d'antenne (10) utilisé se compose d'un ruban (2) magnétique doux continu présentant plusieurs couches superposées formées chacune par une partie du ruban (2). Les couches sont reliées les unes aux autres par des parties recourbées (23) du ruban (2) aux extrémités (11, 12) du noyau d'antenne (10).
EP11702603A 2010-01-29 2011-01-28 Noyau d'antenne, antenne et procédés de fabrication d'un noyau d'antenne et d'une antenne Ceased EP2529447A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010001394A DE102010001394A1 (de) 2010-01-29 2010-01-29 Antennenkern, Antenne sowie Verfahren zur Herstellung eines Antennenkerns und einer Antenne
PCT/EP2011/051258 WO2011092309A1 (fr) 2010-01-29 2011-01-28 Noyau d'antenne, antenne et procédés de fabrication d'un noyau d'antenne et d'une antenne

Publications (1)

Publication Number Publication Date
EP2529447A1 true EP2529447A1 (fr) 2012-12-05

Family

ID=43733257

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11702603A Ceased EP2529447A1 (fr) 2010-01-29 2011-01-28 Noyau d'antenne, antenne et procédés de fabrication d'un noyau d'antenne et d'une antenne

Country Status (6)

Country Link
US (1) US9099767B2 (fr)
EP (1) EP2529447A1 (fr)
KR (1) KR20120115341A (fr)
CN (1) CN102742075A (fr)
DE (1) DE102010001394A1 (fr)
WO (1) WO2011092309A1 (fr)

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CN102749563B (zh) * 2012-07-19 2016-04-06 南方电网科学研究院有限责任公司 局部放电超高频检测小环天线
US9620858B2 (en) * 2013-03-18 2017-04-11 Alfano Robert R Compact electromagnetic-radiation antenna
CN104376957A (zh) * 2014-03-28 2015-02-25 九阳股份有限公司 一种电磁加热用导磁体及其制作工艺
KR101724622B1 (ko) 2014-06-19 2017-04-07 주식회사 아모그린텍 저주파 안테나, 그의 제조방법 및 이를 이용한 키레스 엔트리 시스템
DE102015213795A1 (de) * 2015-07-22 2017-01-26 Robert Bosch Gmbh Magnetischer Körper und Verfahren zu seiner Herstellung
US12100901B2 (en) * 2020-08-07 2024-09-24 Sony Semiconductor Solutions Corporation Antenna and antenna arrangement

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Also Published As

Publication number Publication date
DE102010001394A1 (de) 2011-08-04
US20130088401A1 (en) 2013-04-11
KR20120115341A (ko) 2012-10-17
CN102742075A (zh) 2012-10-17
WO2011092309A1 (fr) 2011-08-04
US9099767B2 (en) 2015-08-04

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