EP0520197A2 - Antenne à feuille - Google Patents

Antenne à feuille Download PDF

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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)
English (en)
Other versions
EP0520197B1 (fr
EP0520197A3 (fr
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/fr
Publication of EP0520197A3 publication Critical patent/EP0520197A3/fr
Application granted granted Critical
Publication of EP0520197B1 publication Critical patent/EP0520197B1/fr
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
    • H01Q1/12—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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Details Of Aerials (AREA)
  • Laminated Bodies (AREA)
  • Support Of Aerials (AREA)
EP92108893A 1991-06-25 1992-05-27 Antenne à feuille Expired - Lifetime EP0520197B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4121333A DE4121333A1 (de) 1991-06-25 1991-06-25 Folienantenne
DE4121333 1991-06-25

Publications (3)

Publication Number Publication Date
EP0520197A2 true EP0520197A2 (fr) 1992-12-30
EP0520197A3 EP0520197A3 (fr) 1994-10-12
EP0520197B1 EP0520197B1 (fr) 1997-05-28

Family

ID=6434925

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92108893A Expired - Lifetime EP0520197B1 (fr) 1991-06-25 1992-05-27 Antenne à feuille

Country Status (6)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001008260A1 (fr) * 1999-07-22 2001-02-01 Ericsson, Inc. Antennes plates a double bande de frequence pour dispositifs de communicaiton sans fil
EP1258945A2 (fr) * 2001-05-16 2002-11-20 The Furukawa Electric Co., Ltd. Antenne en forme linéaire

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4324480C2 (de) * 1993-07-21 1997-07-17 Hirschmann Richard Gmbh Co Antennenanordnung
DE19511300A1 (de) * 1995-03-28 1996-10-02 Telefunken Microelectron Antennenstruktur
DE19707535A1 (de) * 1997-02-25 1998-08-27 Rothe Lutz Dr Ing Habil Folienstrahler
JP3649099B2 (ja) * 2000-08-04 2005-05-18 松下電器産業株式会社 無線通信用アンテナ
WO2004047221A1 (fr) * 2002-11-21 2004-06-03 Mitsubishi Denki Kabushiki Kaisha Telephone cellulaire
JP2005252366A (ja) 2004-03-01 2005-09-15 Sony Corp 逆ｆアンテナ
US7183983B2 (en) 2005-04-26 2007-02-27 Nokia Corporation Dual-layer antenna and method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2229865A (en) * 1938-07-25 1941-01-28 Transcontinental & Western Air Radio antenna system
GB1009527A (en) * 1961-12-29 1965-11-10 Collins Radio Co Dual frequency antenna structure
US4079268A (en) * 1976-10-06 1978-03-14 Nasa Thin conformal antenna array for microwave power conversion
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
EP0470797A2 (fr) * 1990-08-10 1992-02-12 Matsushita Electric Industrial Co., Ltd. Arrangement d'antenne

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4454514A (en) * 1981-05-14 1984-06-12 Tokyo Shibaura Denki Kabushiki Kaisha Strip antenna with polarization control
DE3306054A1 (de) * 1983-02-22 1984-08-23 Meier Meßtechnik, 3400 Göttingen Folien-antenne
KR900009111B1 (ko) * 1986-11-07 1990-12-22 야기 안테나 가부시기가이샤 필름형 안테나 장치

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2229865A (en) * 1938-07-25 1941-01-28 Transcontinental & Western Air Radio antenna system
GB1009527A (en) * 1961-12-29 1965-11-10 Collins Radio Co Dual frequency antenna structure
US4079268A (en) * 1976-10-06 1978-03-14 Nasa Thin conformal antenna array for microwave power conversion
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
EP0470797A2 (fr) * 1990-08-10 1992-02-12 Matsushita Electric Industrial Co., Ltd. Arrangement d'antenne

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 5, no. 44 (E-50) (716) 24. März 1981 & JP-A-56 000 704 (MATSUSHITA DENKI SANGYO K.K.) 7. Januar 1981 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001008260A1 (fr) * 1999-07-22 2001-02-01 Ericsson, Inc. Antennes plates a double bande de frequence pour dispositifs de communicaiton sans fil
US6204826B1 (en) 1999-07-22 2001-03-20 Ericsson Inc. Flat dual frequency band antennas for wireless communicators
EP1258945A2 (fr) * 2001-05-16 2002-11-20 The Furukawa Electric Co., Ltd. Antenne en forme linéaire
EP1258945A3 (fr) * 2001-05-16 2003-11-05 The Furukawa Electric Co., Ltd. Antenne en forme linéaire
US6894646B2 (en) 2001-05-16 2005-05-17 The Furukawa Electric Co., Ltd. Line-shaped antenna

Also Published As

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

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