WO2000033418A1 - Antenne tige en plastique electroconducteur - Google Patents

Antenne tige en plastique electroconducteur Download PDF

Info

Publication number
WO2000033418A1
WO2000033418A1 PCT/DE1999/003810 DE9903810W WO0033418A1 WO 2000033418 A1 WO2000033418 A1 WO 2000033418A1 DE 9903810 W DE9903810 W DE 9903810W WO 0033418 A1 WO0033418 A1 WO 0033418A1
Authority
WO
WIPO (PCT)
Prior art keywords
rod antenna
electrically conductive
antenna according
plastic
conductive particles
Prior art date
Application number
PCT/DE1999/003810
Other languages
German (de)
English (en)
Inventor
Detlef Houdeau
Original Assignee
Infineon Technologies 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 Infineon Technologies Ag filed Critical Infineon Technologies Ag
Publication of WO2000033418A1 publication Critical patent/WO2000033418A1/fr

Links

Classifications

    • 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
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/44—Details of, or arrangements associated with, antennas using equipment having another main function to serve additionally as an antenna, e.g. means for giving an antenna an aesthetic aspect

Definitions

  • Rod antenna made of electrically conductive plastic
  • the invention relates to a rod antenna based on an electrically conductive plastic.
  • the invention relates to such a rod antenna, which is not recognizable as such and has a low electrical resistance on ⁇ .
  • LCDs liquid crystal elements
  • carrier made of plastic as a base.
  • Such LCDs usually comprise an approximately 50 ⁇ m thick carrier film made of polyester, one surface of which has transparent, electrically conductive
  • Such LCDs are surface conductors that have a very high electrical resistance. Because of this electrical resistance, the electrically conductive doped carrier films are only poorly suited for use as a rod antenna.
  • the object of the invention is to specify a rod antenna based on an electrically conductive plastic.
  • This rod antenna should preferably not be recognizable as such and particularly preferably have the lowest possible electrical resistance.
  • the rod antenna therefore consists of a matrix made of plastic, in which electrically conductive particles with a concentration above the percolation threshold are embedded in a region that extends through the matrix in the form of a thread or ribbon.
  • the electrical trically conductive particles can also be applied to a surface of the plastic matrix. The former option is preferred since a volume conductor is obtained in this way, the electrical resistance of which is lower than that of the plastic-based surface conductors described above.
  • Such electrically conductive particles are used in the present invention, the rod antenna, which he is not ⁇ recognizable with the naked eye. If such non-recognizable electrically conductive particles are used in connection with transparent plastics, transparent rod antennas are obtained. There are a multitude of possible uses for such rod antennas. Such transparent rod antennas are particularly suitable, for example, if certain objects are to be secured against falsification in a manner which is not readily recognizable. Such items can be, for example, identification documents such as identity cards, passports, driver's licenses, etc., securities such as shares or banknotes. To protect against counterfeiting or to prove authenticity, these objects can be equipped with a small semiconductor chip that contains product-relevant information stored.
  • This product-relevant information can then be transmitted to a suitable reading device via the rod antenna according to the invention and evaluated there.
  • a transparent rod antenna according to the invention it is practically not recognizable that a marked object has an authenticity marking at all. This further increases protection against counterfeiting.
  • a further increased level of security against forgery can be achieved if the rod antenna according to the invention itself is provided with a security against forgery.
  • identification can consist, for example, in that an area of the rod antenna is provided with perforations.
  • the perforations can be designed in such a way that they can only be recognized when irradiated with light of a certain wavelength, certain angle of incidence or the like. For example the perforations can be such that a certain silhouette is shown when irradiated with light.
  • the inventiveness modern rod antenna offers the further advantage that it is free from ⁇ favorable raw materials easily manufactured. Moreover, very small and thin rod antennas can be placed ⁇ ago.
  • the plastic which can serve as the basis for the rod antenna according to the invention, can be selected from a wide range.
  • all plastics that have previously been used in connection with LCDs are suitable.
  • the plastics are expediently transparent.
  • Preferred plastics are thermoplastics such as polyolefins or polyester.
  • a cast plastic film is preferably used as the matrix of the rod antenna according to the invention.
  • the electrically conductive particles can then be embedded in the plastic matrix when the film is cast.
  • the electrically conductive particles can also be selected from a large number of materials.
  • Metal compounds such as metal oxides or metal nitrides, which can also be used in combinations with one another, are particularly suitable. Suitable metal compounds are, for example, nitrides or oxides of indium, tin, barium, strontium or yttrium. Such metal compounds are e.g. known from the field of superconductors. A particularly preferred material is indium tin oxide.
  • the electrically conductive particles used in connection with the rod antenna according to the invention can consist entirely of one or more of the materials mentioned above, or they are made with one or more of the materials mentioned Coated metal connections. Titanium dioxide particles, for example, are suitable as packing elements to which the coating is applied.
  • the electrically conductive particles are used in such a way that they cannot be seen in the rod antenna with the naked eye, but on the other hand a sufficient current flow through the rod antenna is ensured.
  • These requirements can be achieved on the one hand that very small electrically conductive particles are used, which are not visible without optical aids, or the part ⁇ chen themselves are transparent.
  • the electrically conductive particles with a concentration above the percolation threshold are used.
  • a proportion of 15% by weight or more of the electrically conductive particles, based on the thread-like or band-shaped region of the plastic matrix in which the particles are embedded or to which they are applied, will suffice.
  • the respective concentration of the electrically conductive particles in the matrix suitably depends on the required current flow or the desired electrical resistance.
  • the rod antenna 1 shows a rod antenna 1 according to the invention, which has a matrix made of plastic 2 and electrically conductive particles 3 applied thereon.
  • the electrically conductive particles 3 consist of indium tin oxide (Indium tin oxide, ITO), which were evaporated or sputtered onto the plastic matrix 2 made of polyolefin.
  • ITO indium tin oxide
  • FIG. 2 shows a further rod antenna 1 according to the invention.
  • the electrically conductive particles 3 are embedded in the plastic matrix.
  • the rod antenna 1 has a band-shaped matrix made of plastic 2.
  • the electrically conductive particles 3 are arranged approximately in a thread shape and are present in an amount such that the percolation threshold can be exceeded and an electric current can flow.
  • the plastic matrix 2 is a cast film made of polyester, the electrically conductive particles 3 ⁇ consist of ITO-coated titanium dioxide.

Landscapes

  • Compositions Of Macromolecular Compounds (AREA)
  • Details Of Aerials (AREA)

Abstract

L'invention concerne une antenne tige à base de plastique électroconducteur. Une zone qui s'étend en forme de fil ou de bande à travers ou sur une matrice plastique, comporte des particules électroconductrices dont la concentration est supérieure au seuil de percolation. Ces particules ne sont pas décelables à l'oeil nu de telle façon que l'on obtienne une antenne tige transparente.
PCT/DE1999/003810 1998-12-01 1999-12-01 Antenne tige en plastique electroconducteur WO2000033418A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19855450.8 1998-12-01
DE1998155450 DE19855450A1 (de) 1998-12-01 1998-12-01 Stabantenne aus elektrisch leitfähigem Kunststoff

Publications (1)

Publication Number Publication Date
WO2000033418A1 true WO2000033418A1 (fr) 2000-06-08

Family

ID=7889658

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1999/003810 WO2000033418A1 (fr) 1998-12-01 1999-12-01 Antenne tige en plastique electroconducteur

Country Status (2)

Country Link
DE (1) DE19855450A1 (fr)
WO (1) WO2000033418A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004073106A2 (fr) * 2003-02-12 2004-08-26 E.I. Du Pont De Nemours And Company Compositions thermoplastiques conductrices et antennes les contenant

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2385021A (en) * 2002-02-08 2003-08-13 David Ganeshmoorthy A method of manufacturing by moulding and a product thereof
JP2005249773A (ja) * 2004-02-02 2005-09-15 Toyota Motor Corp レーダ装置ビーム経路内用成形品

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4624865A (en) * 1984-05-21 1986-11-25 Carolina Solvents, Inc. Electrically conductive microballoons and compositions incorporating same
EP0698866A1 (fr) * 1994-08-22 1996-02-28 WHD elektronische Prüftechnik GmbH Machines à essayer et méthode pour essayer des documents dans une machine à usiner
DE29604504U1 (de) * 1996-02-29 1996-06-13 Lfp Elektronische Spezialsiche Einrichtung zur Prüfung von Sicherheitsdokumenten
US5612087A (en) * 1992-09-29 1997-03-18 Mitsui Mining & Smelting Co., Ltd. Method for preparing a fibrous electrically conductive filler
WO1997015935A1 (fr) * 1995-10-23 1997-05-01 Mitsubishi Materials Corporation Film transparent conducteur de l'electricite et composition de revetement pour former un tel film
EP0905657A1 (fr) * 1997-09-23 1999-03-31 STMicroelectronics S.r.l. Billet de banque comportant un circuit integré

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1905444A1 (de) * 1968-02-06 1970-09-03 Yoshie Ohkubo Antenne
DE4006353A1 (de) * 1990-03-01 1991-09-05 Dornier Luftfahrt Radomwerkstoff
DE4140296A1 (de) * 1991-12-06 1993-06-09 Merck Patent Gmbh, 6100 Darmstadt, De Leitfaehige plaettchenfoermige pigmente
EP0594375A3 (fr) * 1992-10-22 1995-03-15 Pilkington Glass Ltd Fenêtre comprenant une antenne boucle à induction.
FR2747812B1 (fr) * 1996-04-23 1998-05-22 Solaic Sa Carte a circuit integre sans contact avec antenne en polymere conducteur

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4624865A (en) * 1984-05-21 1986-11-25 Carolina Solvents, Inc. Electrically conductive microballoons and compositions incorporating same
US5612087A (en) * 1992-09-29 1997-03-18 Mitsui Mining & Smelting Co., Ltd. Method for preparing a fibrous electrically conductive filler
EP0698866A1 (fr) * 1994-08-22 1996-02-28 WHD elektronische Prüftechnik GmbH Machines à essayer et méthode pour essayer des documents dans une machine à usiner
WO1997015935A1 (fr) * 1995-10-23 1997-05-01 Mitsubishi Materials Corporation Film transparent conducteur de l'electricite et composition de revetement pour former un tel film
DE29604504U1 (de) * 1996-02-29 1996-06-13 Lfp Elektronische Spezialsiche Einrichtung zur Prüfung von Sicherheitsdokumenten
EP0905657A1 (fr) * 1997-09-23 1999-03-31 STMicroelectronics S.r.l. Billet de banque comportant un circuit integré

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004073106A2 (fr) * 2003-02-12 2004-08-26 E.I. Du Pont De Nemours And Company Compositions thermoplastiques conductrices et antennes les contenant
WO2004073106A3 (fr) * 2003-02-12 2004-09-23 Du Pont Compositions thermoplastiques conductrices et antennes les contenant
US6953619B2 (en) 2003-02-12 2005-10-11 E. I. Du Pont De Nemours And Company Conductive thermoplastic compositions and antennas thereof

Also Published As

Publication number Publication date
DE19855450A1 (de) 2000-06-21

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