EP0520197A2 - Foil antenna - Google Patents

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Publication number
EP0520197A2
EP0520197A2 EP92108893A EP92108893A EP0520197A2 EP 0520197 A2 EP0520197 A2 EP 0520197A2 EP 92108893 A EP92108893 A EP 92108893A EP 92108893 A EP92108893 A EP 92108893A EP 0520197 A2 EP0520197 A2 EP 0520197A2
Authority
EP
European Patent Office
Prior art keywords
antenna
radiating elements
inductors
foil
film
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
EP92108893A
Other languages
German (de)
French (fr)
Other versions
EP0520197A3 (en
EP0520197B1 (en
Inventor
Christoph Petermann
Heinrich Flügel
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.)
Hagenuk Telecom GmbH
Original Assignee
Hagenuk Vorm Neufeldt and Kuhnke GmbH
Hagenuk Telecom GmbH
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 Hagenuk Vorm Neufeldt and Kuhnke GmbH, Hagenuk Telecom GmbH filed Critical Hagenuk Vorm Neufeldt and Kuhnke GmbH
Publication of EP0520197A2 publication Critical patent/EP0520197A2/en
Publication of EP0520197A3 publication Critical patent/EP0520197A3/en
Application granted granted Critical
Publication of EP0520197B1 publication Critical patent/EP0520197B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • 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
    • H01Q9/06—Details
    • H01Q9/065—Microstrip dipole antennas

Definitions

  • the invention relates to a film antenna which is provided with an electrically nonconductive carrier material and radiating elements in the form of electrically conductive coatings of the carrier material and also in the form of inductors in the form of electrically conductive coatings and in which an adaptation circuit is attached to the film.
  • Rod antennas are usually used as antennas for cordless telephones, the length of which corresponds to a quarter of the wavelength to be transmitted or received.
  • an adaptation circuit may be required. This adaptation circuit is usually implemented with discrete components into which the antenna signal is fed, or from which the antenna is fed.
  • the rod antenna which is usually attached to the outside of the cordless telephone and the structure of the matching circuit with discrete components (capacitors, coils, resistors) can be regarded as complex in terms of production technology.
  • a film antenna is known from EP 02 74 592 A1, in which both radiating elements and inductors are designed as electrically conductive coatings of a carrier material.
  • the inductors and the radiating elements are arranged in series. Due to a comparatively large dimensioning of the film antenna intended for use as a room antenna, both the radiating elements and the inductors can be designed as conductor tracks with a constant width.
  • the inductors run as linear track sections and the radiating elements are provided with a serpentine course. Separate electrical components are used to form an adaptation circuit. The capacitors and inductors required for this are soldered to the assigned conductor track sections.
  • EP 00 66 094 A1 describes a film antenna in which switching elements are provided in order to specify the mode of operation of the partial elements of the antenna which are electromagnetically coupled to one another.
  • a film antenna has been proposed in DE 33 06 054 A1, in which the spatial position and shape of the antenna system is determined by the shape of the flat structure (film).
  • it is also contemplated to manufacture line transformers, coils and capacitors by arranging conductors next to one another on or in the flat flexible structure. Structures of this type, like the rest of any adaptation with discrete components, result in a loss which weakens the antenna signal.
  • the antenna proposed in this document should have an area of approximately one square meter and be laid, for example, under a carpet. In contrast, a reduction in the size of the antenna is important for radio telephones.
  • the object of the invention is to design an antenna and an adaptation circuit in which the loss is kept as low as possible, which has a good radiation characteristic, which is easy to manufacture in terms of production technology, and which comes with dimensions which are significantly smaller than a quarter of those in question Wavelengths are.
  • the inductors are arranged as a series circuit between the radiating elements and are essentially designed as straight line sections, these line sections being arranged in such a way that the fields emitted by them are compensated in the far field, and the film is only conductively coated on one side is and that the matching circuit is designed as an electrically conductive coating of the carrier material.
  • the film antenna according to the invention is designed as a linear antenna.
  • the antenna is divided into individual radiating elements, between which inductors are arranged.
  • the radiating elements are arranged so that the best possible adaptation is achieved at the desired frequency.
  • Both the radiating elements and the inductances arranged between them are designed as conductive surfaces on a carrier (film).
  • the adaptation circuit still necessary despite the optimized adaptation of the antenna to the desired frequency is applied to the carrier.
  • the shortened overall length is achieved in particular in that the radiating elements are arranged on the one hand in the desired direction of polarization (in the installed position of the film), but on the other hand also in the direction perpendicular thereto in the film plane. Despite this extremely space-saving design, in which the radiating elements are mounted on an approximately square surface, the desired direction of polarization is retained.
  • the inductors arranged according to the invention between the individual radiating elements are essentially designed as straight line pieces. These are also intended to include elongated S-shaped designs or those with a step-like shape can be understood.
  • the antenna is to be designed in such a way that line sections behave as inductors, but in the far field the radiated fields of these inductors compensate each other. The field of the radiating elements that is emitted in phase remains.
  • the antenna according to the invention can be produced by coating the carrier material on both sides.
  • a special embodiment, however, provides that the coating is carried out only on one side. This has particular advantages in terms of manufacturing technology.
  • Individual radiating elements are advantageously arranged next to one another in one direction. This results in a first approximately linear arrangement which essentially corresponds to the polarization direction desired in the installed state of the antenna. To this first approximately linear arrangement of radiating elements, a second likewise approximately linear arrangement of radiating elements is advantageously provided laterally offset.
  • the surfaces of the radiating elements overlap in a projection direction perpendicular to the two linear parallel arrangements.
  • the radiating elements are housed in the bends of the meander. This increases the radiation resistance. This significantly reduces the influence of the losses in the carrier and the environment. In particular, however, it is important that the radiating elements are correctly electrically connected to one another. This means that the elements must be interconnected in the correct phase.
  • each line has an inductance.
  • inductance of a line increases the smaller its diameter. Therefore, inductors in the decimeter and microwave range can also be formed by straight lines.
  • Drawing -D- shows the possibility of further shortening the antenna by so-called “distributed inductors”. This can reduce losses. Possibly due to the strong shortening of the blind components must be eliminated by appropriate wiring 3 according to drawing -E.
  • FIG. 2 The observation for a quarter-wave radiator according to FIG. 2 is to be made analogously.
  • the housing 5 represents the "counterweight".
  • Fig. 2 -F-to -I- show the procedure for shortening the antenna.
  • the radiating elements do not necessarily have to be arranged one above the other. According to the invention, they can be moved laterally. However, this is only possible to a small extent without resulting in a significant deviation from the directional diagram of the quarter-wave antenna -I- due to phase cancellation. It should also be noted that the inductance of antiphase lines, such as those used in -I-, is partially canceled out.
  • the antenna is to be designed in such a way that line sections 2 behave as inductors, but the radiated fields of these inductors compensate each other in the far field. According to the invention, the field of the radiating elements 1 emitted in phase remains.
  • FIG. 3 shows the implementation of a shortened antenna with the dimensions of approx. 25 x 25 mm. This is as a copper layer on a suitable carrier material, for. B. polyimide or epoxy glass fiber films applied.
  • Four radiating elements 1 are connected by three inductors 2.
  • a transformer made of line inductors 3 adapts the antenna to the 50 ohm antenna connection 4. The extremely small size compared to the wavelength of 300 mm to be received is remarkable.
  • antennas are also conceivable, such as e.g. B. a greatly shortened dipole in this way.
  • the antenna according to the invention can be fully integrated into the housing of the cordless telephone due to its reduced size.
  • the housing forms the antenna counterweight.
  • the antenna is also manufacturing technology nisch simple - especially for SMD technology - enables external components to be saved and has a relatively high level of efficiency with a relatively good directional characteristic.
  • the main radiation direction is approx. 30 ° downwards when the device is standing vertically and at the same time has good omnidirectional characteristics.
  • the antenna according to the invention is also relatively insensitive to detuning of the antenna by handling the cordless telephone.

Abstract

The invention relates to a foil antenna for radio telephones, especially cordless telephones. Instead of the previously normal rod antenna, whose length corresponds to a quarter of the wavelength of the frequency which is to be transmitted or received, a foil antenna is proposed as the antenna. The foil antenna according to the invention has radiating elements which are connected to one another by means of inductors. In addition, the matching circuit is accommodated on the foil. The inductors which are arranged between the radiating elements are essentially constructed as straight line pieces. The antenna according to the invention can be produced easily in production-engineering terms, can be completely integrated into the housing of the cordless telephone, and has a relatively high efficiency with dimensions which are considerably less than the length of the previously normal rod antenna. <IMAGE>

Description

Die Erfindung betrifft eine Folienantenne, die mit einem elektrisch nichtleitenden Trägermaterial und als elektrisch leitfähige Beschichtungen des Trägermaterials ausgebildeten strahlenden Elemente sowie ebenfalls als elektrisch leitfähige Beschichtungen ausgebildeten Induktivitäten versehen ist und bei der auf der Folie eine Anpassungsschaltung angebracht ist.The invention relates to a film antenna which is provided with an electrically nonconductive carrier material and radiating elements in the form of electrically conductive coatings of the carrier material and also in the form of inductors in the form of electrically conductive coatings and in which an adaptation circuit is attached to the film.

Als Antennen für schnurlose Telefone werden üblicherweise Stabantennen eingesetzt, deren Länge einem Viertel der zu übertragenden bzw. zu empfangenden Wellenlänge entspricht. Da aus mechanischen Gründen dieses jedoch nicht jederzeit realisiert werden kann, wird möglicherweise eine Anpassungsschaltung erforderlich. Diese Anpassungsschaltung wird üblicherweise mit diskreten Bauelementen realisiert, in die das Antennensignal eingespeist wird, bzw. von denen aus die Einspeisung in die Antenne erfolgt.Rod antennas are usually used as antennas for cordless telephones, the length of which corresponds to a quarter of the wavelength to be transmitted or received. However, since this cannot be implemented at any time for mechanical reasons, an adaptation circuit may be required. This adaptation circuit is usually implemented with discrete components into which the antenna signal is fed, or from which the antenna is fed.

Die in der Regel außen am schnurlosen Telefon angebrachte Stabantenne und der Aufbau der Anpassungsschaltung mit diskreten Bauelementen (Kondensatoren, Spulen, Widerständen) kann als fertigungstechnisch aufwendig angesehen werden.The rod antenna, which is usually attached to the outside of the cordless telephone and the structure of the matching circuit with discrete components (capacitors, coils, resistors) can be regarded as complex in terms of production technology.

Aus der EP 02 74 592 A1 ist eine Folienantenne bekannt, bei der sowohl strahlende Elemente als auch Induktivitäten als elektrisch leitfähige Beschichtungen eines Trägermaterials ausgebildet sind. Die Induktivitäten und die strahlenden Elemente sind als Reihenschaltung angeordnet. Aufgrund einer vergleichsweise großen Dimensionierung der für eine Verwendung als Zimmerantenne vorgesehenen Folienantenne können sowohl die strahlenden Elemente als auch die Induktivitäten als Leiterbahnen mit konstanter Breite ausgebildet sein. Die Induktivitäten verlaufen als lineare Leiterbahnstücke und die strahlenden Elemente sind mit einem Schlangenlinienverlauf versehen. Zur Ausbildung einer Anpassungsschaltung werden separate elektrische Bauelemente verwendet. Die hierzu erforderlichen Kondensatoren und Induktivitäten werden mit den zugeordneten Leiterbahnabschnitten verlötet.A film antenna is known from EP 02 74 592 A1, in which both radiating elements and inductors are designed as electrically conductive coatings of a carrier material. The inductors and the radiating elements are arranged in series. Due to a comparatively large dimensioning of the film antenna intended for use as a room antenna, both the radiating elements and the inductors can be designed as conductor tracks with a constant width. The inductors run as linear track sections and the radiating elements are provided with a serpentine course. Separate electrical components are used to form an adaptation circuit. The capacitors and inductors required for this are soldered to the assigned conductor track sections.

In der EP 00 66 094 A1 ist eine Folienantenne beschrieben, bei der Schaltelemente vorgesehen sind, um die Betriebsweise der elektromagnetisch miteinander verkoppelten Teilelemente der Antenne vorzugeben.EP 00 66 094 A1 describes a film antenna in which switching elements are provided in order to specify the mode of operation of the partial elements of the antenna which are electromagnetically coupled to one another.

In der DE 33 06 054 A1 ist eine Folienantenne vorgeschlagen worden, bei der die räumliche Lage und Form des Antennensystems durch die Form der flächigen Struktur (Folie) festgelegt wird. Zusätzlich ist daran gedacht, auf der Folie außer der eigentlichen Antenne auch Leitungstransformatoren, Spulen und Kondensatoren durch Nebeneinanderanordnung von Leitern auf oder in der flächigen flexiblen Struktur herzustellen. Derartige Strukturen bewirken wie im übrigen auch jede Anpassung mit diskreten Bauelementen einen Verlust, durch den das Antennensignal geschwächt wird.A film antenna has been proposed in DE 33 06 054 A1, in which the spatial position and shape of the antenna system is determined by the shape of the flat structure (film). In addition to the actual antenna, it is also contemplated to manufacture line transformers, coils and capacitors by arranging conductors next to one another on or in the flat flexible structure. Structures of this type, like the rest of any adaptation with discrete components, result in a loss which weakens the antenna signal.

Die in dieser Druckschrift vorgeschlagene Antenne soll eine Fläche von etwa einem Quadratmeter haben und beispielsweise unter einem Teppich verlegt werden. Demgegenüber kommt es für Funktelefone auf eine Verkleinerung der Antenne an.The antenna proposed in this document should have an area of approximately one square meter and be laid, for example, under a carpet. In contrast, a reduction in the size of the antenna is important for radio telephones.

Aufgabe der Erfindung ist es, eine Antenne und eine Anpassungsschaltung zu konzipieren, bei der der Verlust möglichst gering gehalten wird, die eine gute Abstrahlcharakteristik aufweist, die fertigungstechnisch einfach herzustellen ist und die mit Abmessungen auskommt, die deutlich kleiner als ein Viertel der in Frage kommenden Wellenlängen sind.The object of the invention is to design an antenna and an adaptation circuit in which the loss is kept as low as possible, which has a good radiation characteristic, which is easy to manufacture in terms of production technology, and which comes with dimensions which are significantly smaller than a quarter of those in question Wavelengths are.

Diese Aufgabe wird durch dadurch gelöst, daß die Induktivitäten als Reihenschaltung zwischen den strahlenden Elementen angeordnet und im wesentlichen als gerade Leitungsstücke ausgebildet sind, wobei diese Leitungsstücke so angeordnet sind, daß die von ihnen abgestrahlten Felder im Fernfeld kompensiert sind, die Folie nur einseitig leitend beschichtet ist und daß die Anpassungsschaltung als eine elektrisch leitfähige Beschichtung des Trägermaterials ausgebildet ist.This object is achieved in that the inductors are arranged as a series circuit between the radiating elements and are essentially designed as straight line sections, these line sections being arranged in such a way that the fields emitted by them are compensated in the far field, and the film is only conductively coated on one side is and that the matching circuit is designed as an electrically conductive coating of the carrier material.

Die erfindungsgemäße Folienantenne ist als lineare Antenne ausgebildet. Um die Antennenabmessungen möglichst klein zu halten, wird die Antenne in einzelne strahlende Elemente unterteilt, zwischen denen Induktivitäten angeordnet sind. Die strahlenden Elemente sind dabei so angeordnet, daß bei der gewünschten Frequenz eine möglichst gute Anpassung erreicht wird. Sowohl die strahlenden Elemente als auch die zwischen ihnen angeordneten Induktivitäten sind als leitende Flächen auf einem Träger (Folie) ausgebildet. In gleicher Weise ist die trotz optimierter Anpassung der Antenne an die gewünschte Frequenz noch notwendige Anpassungsschaltung auf den Träger aufgebracht. Die verkürzte Baulänge wird insbesondere dadurch erreicht, daß die strahlenden Elemente einerseits in der gewünschten Polarisationsrichtung (in Einbaulage der Folie), andererseits aber auch in der Richtung senkrecht hierzu in der Folienebene angeordnet sind. Trotz dieser äußerst platzsparenden Bauweise, bei der die strahlenden Elemente auf einer etwa quadratischen Fläche angebracht sind, bleibt die gewünschte Polarisationsrichtung erhalten.The film antenna according to the invention is designed as a linear antenna. In order to keep the antenna dimensions as small as possible, the antenna is divided into individual radiating elements, between which inductors are arranged. The radiating elements are arranged so that the best possible adaptation is achieved at the desired frequency. Both the radiating elements and the inductances arranged between them are designed as conductive surfaces on a carrier (film). In the same way, the adaptation circuit still necessary despite the optimized adaptation of the antenna to the desired frequency is applied to the carrier. The shortened overall length is achieved in particular in that the radiating elements are arranged on the one hand in the desired direction of polarization (in the installed position of the film), but on the other hand also in the direction perpendicular thereto in the film plane. Despite this extremely space-saving design, in which the radiating elements are mounted on an approximately square surface, the desired direction of polarization is retained.

Vorteilhafte Gestaltungen der erfindungsgemäßen Antenne nach Anspruch 1 sind in den Unteransprüchen 2 bis 4 angegeben.Advantageous designs of the antenna according to the invention are specified in subclaims 2 to 4.

Die erfindungsgemäß zwischen den einzelnen strahlenden Elementen angeordneten Induktivitäten sind im wesentlichen als gerade Leitungsstücke ausgebildet. Hierunter sollen auch etwa langgestreckte s-förmige Ausführungen oder solche mit einer treppenartigen Formgebung verstanden werden.The inductors arranged according to the invention between the individual radiating elements are essentially designed as straight line pieces. These are also intended to include elongated S-shaped designs or those with a step-like shape can be understood.

Zu beachten ist dabei, daß sich die Induktivitäten gegenphasiger Leitungen teilweise aufheben. Die Antenne ist so zu entwerfen, daß sich gerade Leitungsstücke als Induktivitäten verhalten, aber im Fernfeld sich die abgestrahlten Felder dieser Induktivitäten kompensieren. Es bleibt das gleichphasig abgestrahlte Feld der strahlenden Elemente.It should be noted that the inductances of opposite-phase lines partially cancel each other out. The antenna is to be designed in such a way that line sections behave as inductors, but in the far field the radiated fields of these inductors compensate each other. The field of the radiating elements that is emitted in phase remains.

Die erfindungsgemäße Antenne kann durch beidseitige Beschichtung des Trägermaterials hergestellt werden. Eine besondere Ausführung sieht jedoch vor, daß die Beschichtung ausschließlich einseitig erfolgt. Dies hat insbesondere fertigungstechnische Vorteile.The antenna according to the invention can be produced by coating the carrier material on both sides. A special embodiment, however, provides that the coating is carried out only on one side. This has particular advantages in terms of manufacturing technology.

Vorteilhafterweise sind einzelne strahlende Elemente in einer Richtung nebeneinander angeordnet. Dadurch ergibt sich eine erste etwa lineare Anordnung, die im wesentlichen mit der im eingebauten Zustand der Antenne gewünschten Polarisationsrichtung übereinstimmt. Zu dieser ersten etwa linearen Anordnung von strahlenden Elementen ist seitlich versetzt vorteilhafterweise eine zweite ebenfalls etwa lineare Anordnung von strahlenden Elementen vorgesehen.Individual radiating elements are advantageously arranged next to one another in one direction. This results in a first approximately linear arrangement which essentially corresponds to the polarization direction desired in the installed state of the antenna. To this first approximately linear arrangement of radiating elements, a second likewise approximately linear arrangement of radiating elements is advantageously provided laterally offset.

In einer besonderen Ausführung überschneiden sich in einer zu den beiden linearen parallelen Anordnungen senkrechten Projektionsrichtung die Flächen der strahlenden Elemente. Die strahlenden Elemente in dieser Anordnung bilden zusammen mit den zwischen ihnen angeordneten Induktivitäten eine etwa mäanderförmige Struktur. Dabei sind die strahlenden Elemente etwa in den Biegungen des Mäanders untergebracht. Hierdurch wird der Strahlungswiderstand angehoben. Dadurch wird der Einfluß der Verluste im Träger und der Umgebung deutlich reduziert. Insbesondere kommt es jedoch darauf an, daß die strahlenden Elemente elektrisch richtig miteinander verbunden sind. Das bedeutet, daß auf phasenrichtige Zusammenschaltung der Elemente zu achten ist.In a special embodiment, the surfaces of the radiating elements overlap in a projection direction perpendicular to the two linear parallel arrangements. The radiating elements in this arrangement, together with the inductors arranged between them, form an approximately meandering structure. The radiating elements are housed in the bends of the meander. This increases the radiation resistance. This significantly reduces the influence of the losses in the carrier and the environment. In particular, however, it is important that the radiating elements are correctly electrically connected to one another. This means that the elements must be interconnected in the correct phase.

Es zeigen:

  • Fig. 1 die Verkürzung eines Halbwellen-Dipols nach dem Stand der Technik;
  • Fig. 2 die Verkürzung eines Viertelwellenstrahlers;
  • Fig. 3 eine spezielle Ausführung eines verkürzten Viertelwellenstrahlers.
Show it:
  • 1 shows the shortening of a half-wave dipole according to the prior art;
  • 2 shows the shortening of a quarter-wave radiator;
  • Fig. 3 shows a special version of a shortened quarter-wave radiator.

In Fig. 1 ist die Vorgehensweise für die mechanische Verkürzung eines Halbwellendipols -A- gezeigt. Dessen strahlende Elemente 1 werden über den Anschluß 4 mit Hochfrequenzenergie gespeist. Dieses kann über geeignete Maßnahmen symmetrisch oder - über Koaxkabel - unsymmetrisch erfolgen.1 shows the procedure for the mechanical shortening of a half-wave dipole -A-. Its radiating elements 1 are fed with high-frequency energy via the connection 4. This can be done symmetrically using suitable measures or asymmetrically using coax cables.

Werden die strahlenden Elemente 1 aufgetrennt und stärker induktiv wirkende Elemente 2 als die strahlenden Elemente selbst eingefügt, so wird dadurch die mechanische Länge verkürzt, und zwar um so mehr die eingefügte Induktivität 2 erhöht wird. Zeichnungen -B- und -C- zeigen zwei Möglichkeiten. Allerdings nimmt der Effekt zu den Enden der Strahlenden Elemente hin ab, so daß die Induktivität weiter erhöht werden muß. Eine zu hohe Induktivität hat möglicherweise auch erhöhte Verluste.If the radiating elements 1 are separated and inserted more inductively acting elements 2 than the radiating elements themselves, the mechanical length is shortened, and the more the inserted inductance 2 is increased. Drawings -B- and -C- show two options. However, the effect decreases towards the ends of the radiating elements, so that the inductance must be increased further. An inductance that is too high may also have increased losses.

Jede Leitung ist mit einer Induktivität behaftet. In erster Näherung kann angenommen werden, daß die Induktivität einer Leitung steigt, je kleiner deren Durchmesser ist. Daher können Induktivitäten im Dezimeter- und Mikrowellenbereich auch durch gestreckte Leitungen gebildet werden.Each line has an inductance. In a first approximation it can be assumed that the inductance of a line increases the smaller its diameter. Therefore, inductors in the decimeter and microwave range can also be formed by straight lines.

Zeichnung -D- zeigt die Möglichkeit, die Antenne durch sogenannte "verteilte Induktivitäten" weiter zu verkürzen. Dadurch können Verluste gemindert werden. Eventuell müssen durch die starke Verkürzung entstandenen Blindanteile durch entsprechende Beschaltung 3 gemäß Zeichnung -E-beseitigt werden.Drawing -D- shows the possibility of further shortening the antenna by so-called "distributed inductors". This can reduce losses. Possibly due to the strong shortening of the blind components must be eliminated by appropriate wiring 3 according to drawing -E.

Analog ist die Betrachtung für einen Viertelwellenstrahler gemäß Fig. 2 anzustellen. Dabei stellt das Gehäuse 5 das "Gegengewicht" dar. Fig. 2 -F-bis -I- zeigen die Vorgehensweise bei der Verkürzung der Antenne. Die strahlenden Elemente sind nicht notwendigerweise übereinander anzuordnen. Sie können erfindungsgemäß seitlich versetzt werden. Dies ist allerdings nur in kleinem Maße möglich, ohne daß daraus eine wesentliche Abweichung vom Richtdiagramm der Viertelwellenantenne -I-durch Phasenauslöschung resultiert. Ferner ist zu beachten, daß die Induktivität gegenphasiger Leitungen, wie sie in -I- benutzt werden, sich teilweise aufhebt. Die Antenne ist so zu entwerfen, daß sich gerade Leitungsstücke 2 als Induktivitäten verhalten, aber im Fernfeld sich die abgestrahlten Felder dieser Induktivitäten kompensieren. Es bleibt erfindungsgemäß das gleichphasig abgestrahlte Feld der strahlenden Elemente 1.The observation for a quarter-wave radiator according to FIG. 2 is to be made analogously. The housing 5 represents the "counterweight". Fig. 2 -F-to -I- show the procedure for shortening the antenna. The radiating elements do not necessarily have to be arranged one above the other. According to the invention, they can be moved laterally. However, this is only possible to a small extent without resulting in a significant deviation from the directional diagram of the quarter-wave antenna -I- due to phase cancellation. It should also be noted that the inductance of antiphase lines, such as those used in -I-, is partially canceled out. The antenna is to be designed in such a way that line sections 2 behave as inductors, but the radiated fields of these inductors compensate each other in the far field. According to the invention, the field of the radiating elements 1 emitted in phase remains.

In Fig. 3 ist die Realisierung einer verkürzten Antenne mit den Abmessungen von ca. 25 x 25 mm dargestellt. Diese ist als Kupferschicht auf einem geeigneten Trägermaterial, z. B. Polyimid oder Epoxy-Glasfaser-Folien aufgetragen. Vier strahlende Elemente 1 werden durch drei Induktivitäten 2 verbunden. Ein Übertrager aus Leitungsinduktivitäten 3 paßt die Antenne an den 50 Ohm Antennenanschluß 4 an. Beachtlich ist die gegenüber der zu empfangenden Wellenlänge von 300 mm äußerst geringe Baugröße.3 shows the implementation of a shortened antenna with the dimensions of approx. 25 x 25 mm. This is as a copper layer on a suitable carrier material, for. B. polyimide or epoxy glass fiber films applied. Four radiating elements 1 are connected by three inductors 2. A transformer made of line inductors 3 adapts the antenna to the 50 ohm antenna connection 4. The extremely small size compared to the wavelength of 300 mm to be received is remarkable.

Denkbar sind auch andere Antennen, wie z. B. ein auf diese Weise stark verkürzter Dipol.Other antennas are also conceivable, such as e.g. B. a greatly shortened dipole in this way.

Die erfindungsgemäße Antenne kann aufgrund ihrer verkleinerten Bauform vollständig in das Gehäuse des schnurlosen Telefons integriert werden. Dabei bildet das Gehäuse das Antennengegengewicht. Die Antenne ist außerdem fertigungstechnisch einfach - insbesondere für SMD-Technik - herzustellen, ermöglicht das Einsparen externer Bauteile und weist bei relativ guter Richtcharakteristik einen verhältnismäßig hohen Wirkungsgrad auf. Die Hauptabstrahlrichtung ist ca. 30° nach unten bei senkrecht stehendem Gerät und gleichzeitig guter Rundstrahlcharakteristik.Die erfindungsgemäße Antenne ist darüber hinaus relativ unempfindlich gegen Verstimmen der Antenne durch Handhabung des schnurlosen Telefons.The antenna according to the invention can be fully integrated into the housing of the cordless telephone due to its reduced size. The housing forms the antenna counterweight. The antenna is also manufacturing technology nisch simple - especially for SMD technology - enables external components to be saved and has a relatively high level of efficiency with a relatively good directional characteristic. The main radiation direction is approx. 30 ° downwards when the device is standing vertically and at the same time has good omnidirectional characteristics. The antenna according to the invention is also relatively insensitive to detuning of the antenna by handling the cordless telephone.

Claims (4)

1. Folienantenne, die mit einem elektrisch nichtleitenden Trägermaterial und als elektrisch leitfähigen Beschichtungen des Trägermaterials ausgebildeten strahlenden Elemente sowie ebenfalls als elektrisch leitfähige Beschichtungen ausgebildeten Induktivitäten versehen ist und bei der auf der Folie eine Anpassungsschaltung angebracht ist, dadurch gekennzeichnet, daß die Induktivitäten als Reihenschaltung zwischen den strahlenden Elementen angeordnet und im wesentlichen als gerade Leitungsstücke ausgebildet sind, wobei diese Leitungsstücke so angeordnet sind, daß die von ihnen abgestrahlten Felder im Fernfeld kompensiert sind, die Folie nur einseitig leitend beschichtet ist und daß die Anpassungsschaltung als eine elektrisch leitfähige Beschichtung des Trägermaterials ausgebildet ist.1. Foil antenna, which is provided with an electrically non-conductive carrier material and as electrically conductive coatings of the carrier material and also formed as electrically conductive coatings inductors and in which an adaptation circuit is attached to the film, characterized in that the inductors as a series circuit between the radiating elements are arranged and are essentially designed as straight line pieces, these line pieces being arranged such that the fields emitted by them are compensated for in the far field, the film is only coated on one side and that the matching circuit is designed as an electrically conductive coating of the carrier material is. 2. Folienantenne nach Anspruch 2, dadurch gekennzeichnet, daß strahlende Elemente etwa in einer Linie hintereinander angeordnet sind.2. Film antenna according to claim 2, characterized in that radiating elements are arranged approximately in a line one behind the other. 3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß strahlende Elemente in wenigstens zwei zueinander parallelen Linien hintereinander angeordnet sind.3. Apparatus according to claim 2, characterized in that radiating elements are arranged one behind the other in at least two parallel lines. 4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die strahlenden Elemente in der Projektionsrichtung senkrecht zu den etwa parallelen linearen Anordnungen überschneidende Projektionsflächen bilden.4. The device according to claim 3, characterized in that the radiating elements form overlapping projection surfaces in the projection direction perpendicular to the approximately parallel linear arrangements.
EP92108893A 1991-06-25 1992-05-27 Foil antenna Expired - Lifetime EP0520197B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4121333A DE4121333A1 (en) 1991-06-25 1991-06-25 FILM ANTENNA
DE4121333 1991-06-25

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EP0520197A2 true EP0520197A2 (en) 1992-12-30
EP0520197A3 EP0520197A3 (en) 1994-10-12
EP0520197B1 EP0520197B1 (en) 1997-05-28

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ID=6434925

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EP92108893A Expired - Lifetime EP0520197B1 (en) 1991-06-25 1992-05-27 Foil antenna

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EP (1) EP0520197B1 (en)
JP (1) JPH05191126A (en)
AT (1) ATE153803T1 (en)
DE (2) DE4121333A1 (en)
ES (1) ES2103012T3 (en)
ZA (1) ZA924346B (en)

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WO2001008260A1 (en) * 1999-07-22 2001-02-01 Ericsson, Inc. Flat dual frequency band antennas for wireless communicators
EP1258945A2 (en) * 2001-05-16 2002-11-20 The Furukawa Electric Co., Ltd. Line-shaped antenna

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DE4324480C2 (en) * 1993-07-21 1997-07-17 Hirschmann Richard Gmbh Co Antenna arrangement
DE19511300A1 (en) * 1995-03-28 1996-10-02 Telefunken Microelectron Method of forming antenna structure for inserting into chip-card
DE19707535A1 (en) * 1997-02-25 1998-08-27 Rothe Lutz Dr Ing Habil Foil emitter
JP3649099B2 (en) * 2000-08-04 2005-05-18 松下電器産業株式会社 Antenna for wireless communication
JP3833685B2 (en) * 2002-11-21 2006-10-18 三菱電機株式会社 Mobile phone
JP2005252366A (en) 2004-03-01 2005-09-15 Sony Corp Inverted-f antenna
US7183983B2 (en) 2005-04-26 2007-02-27 Nokia Corporation Dual-layer antenna and method

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GB1009527A (en) * 1961-12-29 1965-11-10 Collins Radio Co Dual frequency antenna structure
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JPS56704A (en) * 1979-06-14 1981-01-07 Matsushita Electric Ind Co Ltd Antenna unit
US4816839A (en) * 1987-12-18 1989-03-28 Amtech Corporation Transponder antenna
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Publication number Priority date Publication date Assignee Title
WO2001008260A1 (en) * 1999-07-22 2001-02-01 Ericsson, Inc. Flat dual frequency band antennas for wireless communicators
US6204826B1 (en) 1999-07-22 2001-03-20 Ericsson Inc. Flat dual frequency band antennas for wireless communicators
EP1258945A2 (en) * 2001-05-16 2002-11-20 The Furukawa Electric Co., Ltd. Line-shaped antenna
EP1258945A3 (en) * 2001-05-16 2003-11-05 The Furukawa Electric Co., Ltd. Line-shaped antenna
US6894646B2 (en) 2001-05-16 2005-05-17 The Furukawa Electric Co., Ltd. Line-shaped antenna

Also Published As

Publication number Publication date
DE4121333A1 (en) 1993-01-14
ES2103012T3 (en) 1997-08-16
JPH05191126A (en) 1993-07-30
ATE153803T1 (en) 1997-06-15
EP0520197A3 (en) 1994-10-12
DE59208531D1 (en) 1997-07-03
EP0520197B1 (en) 1997-05-28
DE4121333C2 (en) 1993-09-09
ZA924346B (en) 1993-02-24

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