EP1592085A1 - Spulenantenne - Google Patents

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Publication number
EP1592085A1
EP1592085A1 EP04023835A EP04023835A EP1592085A1 EP 1592085 A1 EP1592085 A1 EP 1592085A1 EP 04023835 A EP04023835 A EP 04023835A EP 04023835 A EP04023835 A EP 04023835A EP 1592085 A1 EP1592085 A1 EP 1592085A1
Authority
EP
European Patent Office
Prior art keywords
coil antenna
resin
antenna according
magnetic core
organic binder
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.)
Granted
Application number
EP04023835A
Other languages
English (en)
French (fr)
Other versions
EP1592085B1 (de
Inventor
Yoshihiko Kato
Naoharu Yamamoto
Makoto Teshima
Mitsuharu Sato
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.)
Tokin Corp
Original Assignee
NEC Tokin Corp
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
Priority claimed from JP2004131977A external-priority patent/JP3964401B2/ja
Priority claimed from JP2004195294A external-priority patent/JP4502320B2/ja
Application filed by NEC Tokin Corp filed Critical NEC Tokin Corp
Publication of EP1592085A1 publication Critical patent/EP1592085A1/de
Application granted granted Critical
Publication of EP1592085B1 publication Critical patent/EP1592085B1/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
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/273—Adaptation for carrying or wearing by persons or animals
    • 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

Definitions

  • This invention relates to a coil antenna used for transmitting and/or for receiving radio signals within a low or medium frequency band, e.g., a frequency range of from 10 kHz to 5 MHz.
  • this invention relates to the coil antenna which also has another function different from the normal function to transmit and/or to receive low- or medium-frequency signals.
  • a typical, well-known system is an AM (amplitude modulation) radio system.
  • a relatively new system is a radio controlled timepiece such as a radio controlled clock or a radio controlled wristwatch.
  • Other relatively new system is an immobilizer for vehicle, a remote keyless entry system for vehicle or for house, or an RFID (radio frequency identification) system.
  • a radio controlled wristwatch see USP No. 6,134,188.
  • a remote keyless entry system for vehicle see USP 6,677,851.
  • An important component common to the above-mentioned apparatuses or the like is an antenna, especially, a coil antenna which comprises a magnetic core and a coil wound around the magnetic core.
  • a well-known magnetic core for coil antenna is made of a sintered ferrite core or a laminated core consisting of amorphous metal sheets.
  • the former is easily breakable and does not have flexibility on design because of its hardness.
  • the latter is not easily machinable and is expensive so that its manufacturing cost becomes high.
  • JP-A 2001-337181 Another coil antenna is disclosed in JP-A 2001-337181.
  • the disclosed coil antenna is used for a radio controlled timepiece or wristwatch and has a magnetic core comprised of powder particles or flakes of ferrite or metal and a plastic binder agent.
  • the magnetic core of JP-A 2001-337181 possesses high impact resistance because of its softness and can be readily formed with low cost.
  • the object is solved according to the coil antenna of claim 1, and according to its application of claim 25, 26, 29 or 30.
  • the coil antenna has the specific complex permeability, while the magnetic core of the coil antenna can suppress noise whose frequency ranges from high frequency to ultra high frequency.
  • the coil antenna according to an aspect of the present invention is a multifunctional coil antenna which is also servable as a noise suppressor.
  • An embodiment of the present invention has two different coil antennas. One of them is for signal transmission, while the other is for signal reception.
  • Each of the coil antennas comprises a magnetic core and a wire wound around the magnetic core.
  • Each of the magnetic cores is made of a mixture comprising soft magnetic powder and an organic binder agent and is formed to be flexible and bendable.
  • the soft magnetic powder comprises a plurality of particles each of which is coated with an insulator layer.
  • each of the magnetic cores is formed in a plate-like shape.
  • the magnetic core for signal transmission has a size of 8 x 8 x 60 mm 3 , and the wire for 10 T is wound thereon.
  • the magnetic core for signal reception has a size 2 x 10 x 60 mm 3 , and the wire for 100 T is wound thereon.
  • Each of the wires is a polyurethane enameled copper wire.
  • Each of the magnetic cores of the plate-like shapes is formed by stacking a plurality of sheet-like shaped magnetic cores thinner than the magnetic core of the plate-like shape. According to the forming method, a large press machine is not required for making a large sized magnetic core. Also, a complicated mold or die is not required for making a magnetic core of a complicated shape, because the sheet-like shaped magnetic core can be easily cut by the use of a cutter or a pair of scissors.
  • the magnetic core may have a string-like shape.
  • Each of the magnetic cores of the present embodiment is obtained by, under the normal atmospheric pressure, casting or molding and curing or hardening the above-mentioned mixtures of the soft magnetic powder and the organic binder agent.
  • the compression molding and the injection molding are not required to obtain the magnetic cores of the present embodiment.
  • the coil antenna for signal transmission and the other coil antenna for signal reception are similar to each other, except for their size and their magnetic flux density of the wires as mentioned above. Now, explanations will be made of the common matters.
  • the soft magnetic powder of this embodiment is Fe-Si-Al alloy powder, especially, Sendust powder.
  • the soft magnetic powder may be other powder.
  • the soft magnetic powder may be Fe carbonyl powder, ferrite powder, or pure iron powder.
  • the soft magnetic powder may be powder made of Fe-Si-Al alloy, Fe-Ni alloy (Permalloy), Fe-Co alloy, Fe-Co-Si alloy, Fe-Si-V alloy, Fe-Co-B alloy, Co base amorphous metal, Fe base amorphous metal, or Mo-permalloy.
  • the soft magnetic powder may be a combination of the above-mentioned powders.
  • the soft magnetic powder comprises flat particles.
  • each of the flat particles has an aspect ratio of 5 or more and its diameter is about 35 ⁇ m.
  • the insulator layer is made of non-magnetic material, especially, an oxide film.
  • the oxide film of this embodiment is formed in an annealing process for the soft magnetic powder.
  • the oxide film may be obtained by another means or way.
  • the insulator layer may be made of an organic binder agent.
  • the organic binder agent of the present embodiment is chlorinated polyethylene.
  • a titanate coupler is added to the organic binder in this embodiment.
  • a silane coupler or an aluminate coupler may be used.
  • no coupler may be used.
  • the organic binder agent may be made of another elastomer agent.
  • the organic binder agent may be thermoplastic resin, such as resin made of polyester resin, polyvinyl chloride resin, chlorinated polyethylene, polyvinyl butyral resin, polyurethane resin, cellulosic resin, polyvinyl acetate resin, phenoxy resin, polypropylene, polycarbonate resin, ABS (acrylonitrile-butadiene-styrene copolymer) resin, polyvinyl alcohol resin, polyimide resin, polyethylene resin, polyamide resin, polyacrylic ester resin, or polyacrylonitrile resin, or copolymer thereof.
  • thermoplastic resin such as resin made of polyester resin, polyvinyl chloride resin, chlorinated polyethylene, polyvinyl butyral resin, polyurethane resin, cellulosic resin, polyvinyl acetate resin, phenoxy resin, polypropylene, polycarbonate resin, ABS (acrylonitrile-butadiene-styrene
  • the organic binder agent may be thermosettable resin, such as resin made of epoxy resin, phenol resin, amide resin, imide resin, diallyl phthalate resin, unsaturated polyester resin, melamine resin, urea resin, or silicone resin, or a combination thereof.
  • the organic binder agent may be synthetic rubber, such as nitrile-butadiene rubber, styrene-butadiene rubber or a combination thereof.
  • the organic binder agent is a plastomer agent, provided that it can provide a flexible, bendable, magnetic core. Another coupling agent can be added to the organic binder.
  • the mixing ratio of the soft magnetic power is 80 wt%, and the total mixing ratio of the organic binder agent and the coupler is 20 wt%.
  • the mixing ratio of the soft magnetic powder in the mixture may be in a range of from 60 wt% to 95 wt%, both inclusive.
  • the mixing ratio of the organic binder in the mixture may be in a range of from 5 wt% to 40 wt%, both inclusive. If a coupler added thereto, the mixing ratio of the coupler in the mixture is 5 wt% or less.
  • the mixture may further comprise an organic flame retardant, such as an organic flame retardant made of halogenide, bromide polymer or a combination thereof.
  • an organic flame retardant such as an organic flame retardant made of halogenide, bromide polymer or a combination thereof.
  • the mixture may further comprise dielectric powder.
  • the coil antenna may further comprise a dielectric layer, which is formed on at least one part of the magnetic core.
  • the dielectric layer is formed on a surface of the plate-shaped magnetic core.
  • the wire is wound around the magnetic core and the dielectric layer.
  • the coil antenna may be covered by a waterproofing case, which is made of flexible elastomer, silicone resin, gum resin, polyamide resin, or a polyester resin.
  • the above-mentioned coil antennas were formed, and their characteristics were measured.
  • two coil antennas were formed of sintered ferrite cores and wires wound thereon; one of the comparative coil antenna was for signal transmission, while the other was for signal reception.
  • the comparative coil antennas had the same structures, shapes, sizes as those of the embodiment except for the materials of the magnetic cores.
  • the characteristics of the comparative coil antennas were also measured. The measured results are as follows.
  • Each of the magnetic cores of the present embodiment had rubber hardness degree of 60 or more, which was measured by using type-A durometer in accordance with JIS K 6253.
  • JIS is an abbreviation of "Japan Industrial Standard”
  • JIS K 6253 is entitled “Hardness testing methods for rubber, vulcanized or thermoplastic”.
  • the magnetic core of the present embodiment had a tensile strength of 3.8 MPa, which was measured in accordance with JIS K 6263.
  • the JIS K 6263 is entitled "Rubber, vulcanized or thermoplastics - Determination of stress relaxation”.
  • the coil antenna for signal transmission and the coil antenna for signal reception had superior transmission and reception characteristics in comparison with the comparative coil antenna for signal transmission and the comparative coil antenna for signal reception.
  • the superior transmission and reception characteristics were kept even when the coil antennas were bent. This is because the particles of the magnetic powder are separated from and independent of each other and work as "micro-cores", respectively. The number of the micro-cores does not change even when the coil antenna is bent because each of the particles is coated with the oxide film.
  • f- ⁇ characteristic of the coil antenna for signal transmission is shown in a semilogarithmic graph of Fig. 1, wherein its vertical axis shows real part ⁇ ' and imaginary part ⁇ " of the complex permeability of the coil antenna.
  • the horizontal axis of the graph shows frequency (MHz).
  • the magnetic core has a complex permeability whose real part ⁇ ' is 70 or more over a frequency range of 10 MHz or less and whose imaginary part ⁇ " is 10 or more over a frequency range of from 10 MHz to 2000 MHz.
  • the real part ⁇ ' has a flat portion while the imaginary part ⁇ " is kept at zero or extremely low value so that the magnetic core has high sensitivity in a low or medium frequency band.
  • the imaginary part ⁇ " has a relatively large value so that the magnetic core of the coil antenna can serve as a superior noise suppressor against high-frequency noise.
  • the f- ⁇ characteristic required for the coil antenna is not limited to the embodiment but may be a specific complex permeability whose real part ⁇ ' is 20 or more over a frequency range of 10 MHz or less and whose imaginary part ⁇ " is 10 or more over a frequency range of 10 MHz or more.
  • the above-mentioned coil antenna is applicable to an electronic apparatus comprising a radio transmitting/receiving system which is transmittable/receivable radio signals ranging from 10 kHz to 5 MHz.
  • the coil antenna is also servable as a high-frequency noise suppressor within the electronic apparatus.
  • Fig. 2 shows an example, in which the above-mentioned coil antenna 10 is applied to a radio controlled wristwatch 100.
  • the radio controlled wristwatch 100 further comprises a mechanism 20 for automatically adjusting a time in accordance with radio signals received by using the coil antenna 10.
  • the radio controlled wristwatch 100 comprises a case 30 and watchbands 40 each depending therefrom.
  • the illustrated coil antenna 10 is embedded in one of the watchbands 40.
  • the magnetic core of a coil antenna may be curved within a plane parallel to the bottom plane of the case 30 and extends along an inside of the peripheral wall of the case 30.
  • the coil antenna of the present embodiment is applicable to a remote keyless entry system, wherein the coil antenna is for receiving user identification signals, which are transmitted from an object carried by a user.
  • the coil antenna may be embedded within the vehicle. More specifically, the coil antenna may be contained in a door handle of the vehicle.
  • the above-mentioned coil antenna can be used as a multiband antenna.
  • a single coil antenna can be used at a frequency for a radio controlled timepiece and at another frequency for a remote keyless entry system.

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  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)
  • Electric Clocks (AREA)
EP20040023835 2004-04-27 2004-10-06 Spulenantenne Expired - Lifetime EP1592085B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2004131977 2004-04-27
JP2004131977A JP3964401B2 (ja) 2004-04-27 2004-04-27 アンテナ用コア、コイルアンテナ、時計、携帯電話機、電子装置
JP2004195294A JP4502320B2 (ja) 2003-07-02 2004-07-01 コイルアンテナ
JP2004195294 2004-07-01

Publications (2)

Publication Number Publication Date
EP1592085A1 true EP1592085A1 (de) 2005-11-02
EP1592085B1 EP1592085B1 (de) 2008-07-16

Family

ID=34926873

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20040023835 Expired - Lifetime EP1592085B1 (de) 2004-04-27 2004-10-06 Spulenantenne

Country Status (2)

Country Link
EP (1) EP1592085B1 (de)
DE (1) DE602004015075D1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006032517A1 (de) * 2006-07-12 2008-01-24 Vaccumschmelze Gmbh & Co. Kg Verfahren zur Herstellung von Pulververbundkernen und Pulververbundkern
EP2051330A4 (de) * 2006-08-11 2011-04-27 Mitsui Chemicals Inc Antennenkern und antenne

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2488927C1 (ru) * 2012-03-16 2013-07-27 Научно-Производственное Общество С Ограниченной Ответственностью "Кв-Связь" Перестраиваемая резонансная антенна с согласующим устройством

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3778836A (en) * 1966-12-27 1973-12-11 T Tanaka Magnetic antenna having a block or circuit components therein
EP0443491A1 (de) * 1990-02-20 1991-08-28 Nippon Telegraph And Telephone Corporation Als Armbanduhr zu tragender Empfänger
EP0480064A1 (de) * 1990-04-27 1992-04-15 Creatic Japan, Inc. Antennenelement
EP0877394A1 (de) * 1996-08-30 1998-11-11 Tokin Corporation Komposit magnetband
US6229444B1 (en) * 1997-09-12 2001-05-08 Mitsubishi Materials Corporation Theftproof tag
EP1150311A2 (de) * 2000-04-27 2001-10-31 TDK Corporation Komposit-Magnetmaterial und Komposit-Dielektrikummaterial für Elektronik-Teile
US6329903B1 (en) * 1994-08-18 2001-12-11 Oi Denki Co., Ltd. Wrist watch-style pager
US6712989B1 (en) * 1999-10-18 2004-03-30 Tokin Corporation Composite magnetic body and electromagnetic interference suppressing body using the same

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3778836A (en) * 1966-12-27 1973-12-11 T Tanaka Magnetic antenna having a block or circuit components therein
EP0443491A1 (de) * 1990-02-20 1991-08-28 Nippon Telegraph And Telephone Corporation Als Armbanduhr zu tragender Empfänger
EP0480064A1 (de) * 1990-04-27 1992-04-15 Creatic Japan, Inc. Antennenelement
US6329903B1 (en) * 1994-08-18 2001-12-11 Oi Denki Co., Ltd. Wrist watch-style pager
EP0877394A1 (de) * 1996-08-30 1998-11-11 Tokin Corporation Komposit magnetband
US6229444B1 (en) * 1997-09-12 2001-05-08 Mitsubishi Materials Corporation Theftproof tag
US6712989B1 (en) * 1999-10-18 2004-03-30 Tokin Corporation Composite magnetic body and electromagnetic interference suppressing body using the same
EP1150311A2 (de) * 2000-04-27 2001-10-31 TDK Corporation Komposit-Magnetmaterial und Komposit-Dielektrikummaterial für Elektronik-Teile

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006032517A1 (de) * 2006-07-12 2008-01-24 Vaccumschmelze Gmbh & Co. Kg Verfahren zur Herstellung von Pulververbundkernen und Pulververbundkern
US8216393B2 (en) 2006-07-12 2012-07-10 Vacuumschmelze Gmbh & Co. Kg Method for the production of powder composite cores and powder composite core
DE102006032517B4 (de) * 2006-07-12 2015-12-24 Vaccumschmelze Gmbh & Co. Kg Verfahren zur Herstellung von Pulververbundkernen und Pulververbundkern
EP2051330A4 (de) * 2006-08-11 2011-04-27 Mitsui Chemicals Inc Antennenkern und antenne
US8035569B2 (en) 2006-08-11 2011-10-11 Mitsui Chemicals, Inc. Antenna core and antenna

Also Published As

Publication number Publication date
EP1592085B1 (de) 2008-07-16
DE602004015075D1 (de) 2008-08-28

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