WO2000033418A1 - Bar antenna comprised of an electrically conductive plastic - Google Patents

Bar antenna comprised of an electrically conductive plastic Download PDF

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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
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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)
French (fr)
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/en

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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.

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

Abstract

The invention relates to a bar antenna made of an electrically conductive plastic. Electrically conductive particles with a concentration greater than the percolation threshold are provided in an area which, in the form of a fiber or strip, extends through or on a plastic matrix. These particles are visible with the naked eye such that a transparent bar antenna can be obtained.

Description

Beschreibungdescription
Stabantenne aus elektrisch leitfähigem KunststoffRod antenna made of electrically conductive plastic
Die Erfindung betrifft eine Stabantenne auf der Basis eines elektrisch leitfähigen Kunststoffs. Insbesondere betrifft die Erfindung eine derartige Stabantenne, welche als solche nicht erkennbar ist und einen geringen elektrischen Widerstand auf¬ weist .The invention relates to a rod antenna based on an electrically conductive plastic. In particular, the invention relates to such a rod antenna, which is not recognizable as such and has a low electrical resistance on ¬.
Aus dem Bereich von Flüssigkristallelementen (LCDs) ist es bekannt, elektrische Leiter mit einem Träger aus Kunststoff als Unterlage herzustellen. Üblicherweise umfassen derartige LCDs einen etwa 50 μm dicken Trägerfilm aus Polyester, dessen eine Oberfläche mit transparenten elektrisch leitfähigenFrom the field of liquid crystal elements (LCDs) it is known to produce electrical conductors with a carrier made of plastic as a base. Such LCDs usually comprise an approximately 50 μm thick carrier film made of polyester, one surface of which has transparent, electrically conductive
Teilchen dotiert ist. Derartige LCDs sind Oberflächenleiter, die einen sehr hohen elektrischen Widerstand aufweisen. Wegen dieses elektrischen Widerstandes sind die elektrisch leitend dotierten Trägerfilme für die Verwendung als Stabantenne nur schlecht geeignet.Particle is doped. 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.
A u f g a b e der Erfindung ist es, eine Stabantenne auf der Basis eines elektrisch leitfähigen Kunststoffs anzugeben. Diese Stabantenne sollte vorzugsweise als solche nicht er- kennbar sein und besonders bevorzugt einen möglichst geringen elektrischen Widerstand aufweisen.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.
Die Lösung dieser Aufgabe gelingt mit der Stabantenne gemäß Anspruch 1. Weiterbildungen und bevorzugte Ausführungsformen ergeben sich aus den Unteransprüchen. Die Erfindung betrifft weiterhin die Verwendung der Stabantenne gemäß Anspruch 10.This object is achieved with the rod antenna according to claim 1. Further developments and preferred embodiments result from the subclaims. The invention further relates to the use of the rod antenna according to claim 10.
Erfindungsgemäß besteht die Stabantenne also aus einer Matrix aus Kunststoff, in welcher in einem sich faden- oder bandför- mig durch die Matrix erstreckenden Bereich elektrisch leitfähige Teilchen mit einer Konzentration oberhalb der Perkolationsschwelle eingebettet sind. Alternativ können die elek- trisch leitfähigen Teilchen auch auf einer Oberfläche der Kunststoffmatrix aufgebracht sein. Erstere Möglichkeit ist bevorzugt, da auf diese Weise ein Volumenleiter erhalten wird, dessen elektrischer Widerstand geringer ist als bei den oben beschriebenen Oberflächenleitern auf Kunststoffbasis.According to the invention, 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. Alternatively, 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.
Erfindungsgemäß werden in der Stabantenne solche elektrisch leitfähigen Teilchen verwendet, die mit bloßem Auge nicht er¬ kennbar sind. Werden derartige nicht erkennbare elektrisch leitfähige Teilchen in Zusammenhang mit transparenten Kunststoffen verwendet, werden transparente Stabantennen erhalten. Für derartige Stabantennen gibt es eine Vielzahl von Verwendungsmöglichkeiten. Besonders geeignet sind solche transparenten Stabantennen beispielsweise, wenn bestimmte Gegen- stände auf nicht ohne weiteres erkennbare Weise gegen Verfälschung gesichert werden sollen. Derartige Gegenstände können beispielsweise Ausweispapiere wie Personalausweise, Reisepässe, Führerscheine u.s.w., Wertpapiere wie Aktien oder auch Geldscheine sein. Zum Schutz gegen Fälschung oder zum Nach- weis der Echtheit können diese Gegenstände mit einem kleinen Halbleiterchip bestückt werden, der produktrelevante Information gespeichert enthält. Diese produktrelevante Information kann dann über die erfindungsgemäße Stabantenne an ein geeignetes Lesegerät übertragen und dort ausgewertet werden. Bei Verwendung einer erfindungsgemäßen transparenten Stabantenne ist praktisch nicht erkennbar, daß ein gekennzeichneter Gegenstand überhaupt eine Echtheitskennzeichnung aufweist. Dies erhöht den Schutz gegen Fälschung zusätzlich.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. When using 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.
Ein weiter erhöhtes Maß an Fälschungssicherheit kann erreicht werden, wenn die erfindungsgemäße Stabantenne selbst mit einer fälschungssicheren Kennzeichnung versehen wird. Eine derartige Kennzeichnung kann beispielsweise darin bestehen, daß ein Bereich der Stabantenne mit Perforationen versehen wird. Die Perforationen können so ausgebildet sein, daß sie nur bei Bestrahlung mit Licht bestimmter Wellenlänge, bestimmten Einfallswinkels oder ähnlichem erkennbar sind. Beispielsweise können die Perforationen so beschaffen sein, daß sich bei Be¬ strahlung mit Licht eine bestimmte Silhouette zeigt.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. Such 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.
Zusätzlich zu den genannten Vorteilen bietet die erfindungs- gemäße Stabantenne den weiteren Vorteil, daß sie aus kosten¬ günstigen Ausgangsmaterialien auf einfache Weise herstellbar ist. Außerdem können sehr kleine und dünne Stabantennen her¬ gestellt werden.In addition to the above advantages, 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.
Der Kunststoff, welcher als Basis für die erfindungsgemäße Stabantenne dienen kann, kann aus einem breiten Bereich ausgewählt werden. Geeignet sind beispielsweise alle Kunststoffe, die bisher im Zusammenhang mit LCDs verwendet wurden. Zweckmäßig sind die Kunststoffe transparent. Bevorzugte Kunststoffe sind Thermoplasten wie Polyolefine oder Polyester.The plastic, which can serve as the basis for the rod antenna according to the invention, can be selected from a wide range. For example, 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.
Vom Gesichtspunkt der Herstellung aus wird als Matrix der erfindungsgemäßen Stabantenne vorzugsweise eine gegossene Kunststoffolie verwendet. Die elektrisch leitfähigen Teilchen können dann beim Gießen der Folie in die Kunststoffmatrix eingebettet werden.From the point of view of manufacture, 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.
Auch die elektrisch leitfähigen Teilchen können aus einer Vielzahl von Materialien ausgewählt werden. Besonders geeignet sind Metallverbindungen wie Metalloxide oder Metallnitride, die auch in Kombinationen miteinander verwendet werden können. Geeignete Metallverbindungen sind beispielsweise Nitride oder Oxide des Indiums, Zinns, Bariums, Strontiums oder Yttriums. Derartige Metallverbindungen sind z.B. aus dem Bereich der Supraleiter bekannt. Ein besonders bevorzugtes Material ist Indium-Zinn-Oxid.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.
Die in Zusammenhang mit der erfindungsgemäßen Stabantenne eingesetzten elektrisch leitfähigen Teilchen können vollständig aus einem oder mehreren der oben genannten Materialien bestehen, oder sie sind mit einer oder mehrerer der genannten Metallverbindungen beschichtet. Als Füllkörper, auf welche die Beschichtung aufgebracht wird, eignen sich beispielsweise Titandioxid-Teilchen.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.
Die elektrisch leitfähigen Teilchen werden erfindungsgemäß so verwendet, daß sie in der Stabantenne mit bloßem Auge nicht erkennbar sind, andererseits aber ein ausreichender Stromfluß durch die Stabantenne sichergestellt ist. Diese Forderungen können einerseits dadurch erreicht werden, daß sehr kleine elektrisch leitfähige Teilchen verwendet werden, welche ohne optische Hilfsmittel nicht sichtbar sind, oder aber die Teil¬ chen selbst sind transparent.According to the invention, 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.
Um eine ausreichende Leitfähigkeit der Stabantenne sicherzu- stellen, werden die elektrisch leitfähigen Teilchen mit einer Konzentration oberhalb der Perkolationsschwelle verwendet. In der Regel wird ein Anteil von 15 Gew.-% oder mehr der elektrisch leitfähigen Teilchen, bezogen auf den faden- oder bandförmigen Bereich der Kunststoffmatrix, in welchem die Teilchen eingebettet oder auf welchen sie aufgetragen sind, ausreichen.To ensure sufficient conductivity of the rod antenna, the electrically conductive particles with a concentration above the percolation threshold are used. As a rule, 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.
Die jeweilige Konzentration der elektrisch leitfähigen Teilchen in der Matrix richtet sich zweckmäßig nach dem erforder- liehen Stromfluß bzw. dem gewünschten elektrischen Widerstand.The respective concentration of the electrically conductive particles in the matrix suitably depends on the required current flow or the desired electrical resistance.
Die Erfindung soll nachfolgend am Beispiel einer Zeichnung näher erläutert werden. Darin zeigen schematischThe invention will be explained in more detail below using the example of a drawing. In it show schematically
Fig. 1 und 2 Teilquerschnitte durch erfindungsgemäße Stabantennen entlang ihrer Längsachse1 and 2 partial cross-sections through rod antennas according to the invention along their longitudinal axis
In Fig. 1 ist eine erfindungsgemäße Stabantenne 1 gezeigt, welche eine Matrix aus Kunststoff 2 sowie auf dieser aufgebrachte elektrisch leitfähige Teilchen 3 aufweist. Die elektrisch leitfähigen Teilchen 3 bestehen aus Indium-Zinn-Oxid (Indium tin oxide, ITO) , welche auf die Kunststoffmatrix 2 aus Polyolefin aufgedampft oder aufgesputtert wurden.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.
Fig. 2 zeigt eine weitere erfindungsgemäße Stabantenne 1. Im Unterschied zu der in Fig. 1 dargestellten Stabantenne sind die elektrisch leitfähigen Teilchen 3 in die Matrix aus Kunststoff eingebettet.FIG. 2 shows a further rod antenna 1 according to the invention. In contrast to the rod antenna shown in FIG. 1, the electrically conductive particles 3 are embedded in the plastic matrix.
Die erfindungsgemäße Stabantenne 1 weist eine bandförmige Ma- trix aus Kunststoff 2 auf. Die elektrisch leitfähigen Teilchen 3 sind in etwa fadenförmig angeordnet und in einer Menge vorhanden, daß die Perkolationsschwelle überschritten und ein elektrischer Strom fließen kann.The rod antenna 1 according to the invention 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.
Die Kunststoffmatrix 2 ist eine Gießfolie aus Polyester, die elektrisch leitfähigen Teilchen 3 ^bestehen aus ITO-beschich- tetem Titandioxid. The plastic matrix 2 is a cast film made of polyester, the electrically conductive particles 3 ^ consist of ITO-coated titanium dioxide.

Claims

Patentansprüche claims
1. Stabantenne (1) auf der Basis eines elektrisch leitfähigen Kunststoffs, d a d u r c h g e k e n n z e i c h n e t , daß in einem sich faden- oder bandförmig erstreckenden Bereich elektrisch leitfähige Teilchen (3) mit einer Konzentra¬ tion oberhalb der Perkolationsschwelle in eine Matrix aus Kunststoff (2) eingebettet oder auf einer Matrix aus Kunst- stoff (2) aufgebracht sind.1. Rod antenna (1) on the basis of an electrically conductive plastic, characterized in that in a to thread-like or strip-like region extending electrically conductive particles (3) having a Konzentra ¬ tion above the percolation threshold in a plastic matrix (2) embedded or are applied to a matrix of plastic (2).
2. Stabantenne gemäß Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß die Kunststoffmatrix eine gegossene Kunststoffolie ist.2. rod antenna according to claim 1, d a d u r c h g e k e n n z e i c h n e t that the plastic matrix is a cast plastic film.
3. Stabantenne gemäß Anspruch 1 oder 2, d a d u r c h g e k e n n z e i c h n e t , daß die Kunststoffmatrix aus einem thermoplastischen Kunststoff und insbesondere aus Polyolefin oder Polyester besteht.3. rod antenna according to claim 1 or 2, d a d u r c h g e k e n e z e i c h n e t that the plastic matrix consists of a thermoplastic material and in particular of polyolefin or polyester.
4. Stabantenne gemäß einem der Ansprüche 1 bis 3, d a d u r c h g e k e n n z e i c h n e t , daß der Kunststoff (2) transparent ist.4. rod antenna according to one of claims 1 to 3, d a d u r c h g e k e n n z e i c h n e t that the plastic (2) is transparent.
5. Stabantenne gemäß einem der Ansprüche 1 bis 4, d a d u r c h g e k e n n z e i c h n e t , daß die elektrisch leitfähigen Teilchen (3) aus einer oder mehreren Metallverbindungen und insbesondere aus einem Metalloxid oder Metallnitrid bestehen.5. rod antenna according to one of claims 1 to 4, d a d u r c h g e k e n n z e i c h n e t that the electrically conductive particles (3) consist of one or more metal compounds and in particular of a metal oxide or metal nitride.
6. Stabantenne gemäß Anspruch 5, d a d u r c h g e k e n n z e i c h n e t , daß die Metallverbindung ausgewählt ist aus einem Nitrid oder6. rod antenna according to claim 5, d a d u r c h g e k e n n z e i c h n e t that the metal compound is selected from a nitride or
Oxid des Indiums, Zinns, Bariums, Strontiums oder Yttriums und insbesondere aus Indium-Zinn-Oxid besteht. Oxide of indium, tin, barium, strontium or yttrium and in particular consists of indium tin oxide.
7. Stabantenne gemäß einem der Ansprüche 1 bis 4, d a d u r c h g e k e n n z e i c h n e t , daß die elektrisch leitfähigen Teilchen (3) aus beschichteten Füllkörpern und insbesondere aus beschichteten Titandioxid- Teilchen bestehen und die Beschichtung ausgewählt ist aus einer der in den Ansprüchen 5 und 6 genannten Metallverbindungen.7. rod antenna according to one of claims 1 to 4, d a d u r c h g e k e n n z e i c h n e t that the electrically conductive particles (3) consist of coated packing elements and in particular of coated titanium dioxide particles and the coating is selected from one of the metal compounds mentioned in claims 5 and 6.
8. Stabantenne gemäß einem der Ansprüche 1 bis 7, d a d u r c h g e k e n n z e i c h n e t , daß die elektrisch leitfähigen Teilchen (3) im faden- oder bandförmigen Bereich der Kunststoffmatrix mit einem Anteil von mindestens 15 Gew.-% eingebettet sind.8. rod antenna according to one of claims 1 to 7, d a d u r c h g e k e n n z e i c h n e t that the electrically conductive particles (3) are embedded in the thread or band-shaped region of the plastic matrix with a proportion of at least 15 wt .-%.
9. Stabantenne gemäß einem der Ansprüche 1 bis 8, d a d u r c h g e k e n n z e i c h n e t , daß sie einen perforierten Bereich aufweist.9. rod antenna according to one of claims 1 to 8, d a d u r c h g e k e n n z e i c h n e t that it has a perforated area.
10. Verwendung der Stabantenne gemäß einem der Ansprüche 1 bis 9 zur Kennzeichnung von Ausweispapieren, Wertpapieren oder Geldscheinen. 10. Use of the rod antenna according to one of claims 1 to 9 for the identification of identification papers, securities or banknotes.
PCT/DE1999/003810 1998-12-01 1999-12-01 Bar antenna comprised of an electrically conductive plastic WO2000033418A1 (en)

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DE1998155450 DE19855450A1 (en) 1998-12-01 1998-12-01 Rod antenna made of electrically conductive plastic
DE19855450.8 1998-12-01

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