EP0509339B1 - Antenne avec capacité en sommet pour téléphone mobile - Google Patents

Antenne avec capacité en sommet pour téléphone mobile Download PDF

Info

Publication number
EP0509339B1
EP0509339B1 EP92105739A EP92105739A EP0509339B1 EP 0509339 B1 EP0509339 B1 EP 0509339B1 EP 92105739 A EP92105739 A EP 92105739A EP 92105739 A EP92105739 A EP 92105739A EP 0509339 B1 EP0509339 B1 EP 0509339B1
Authority
EP
European Patent Office
Prior art keywords
antenna
loading capacity
capacity
counterweight
autotransformer
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.)
Expired - Lifetime
Application number
EP92105739A
Other languages
German (de)
English (en)
Other versions
EP0509339A1 (fr
Inventor
Heinrich Flügel
Christoph Petermann
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 Vorm Neufeldt and Kuhnke GmbH
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 EP0509339A1 publication Critical patent/EP0509339A1/fr
Application granted granted Critical
Publication of EP0509339B1 publication Critical patent/EP0509339B1/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
    • 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
    • H01Q9/32—Vertical arrangement of element
    • H01Q9/36—Vertical arrangement of element with top loading

Definitions

  • the invention relates to an antenna which is provided with a head capacitance and an antenna counterweight and in which an extension coil is arranged at a base point.
  • a shortened antenna is required for mobile telephones, in particular for handheld devices according to the GSM standard (Group Special Mobile), since the previously customary rod antenna, the length of which should be approximately 8 cm, is to be replaced. The latter does not have the broadband characteristics required for handheld devices in terms of adaptation and loss in terms of adaptation and loss.
  • an inductance is usually used to compensate for the missing length.
  • a large current flows through this extension coil, so that even a small loss resistance can reduce the antenna efficiency to an extent that is not acceptable for handheld devices.
  • a shortened antenna can also be resonated with a capacitive load on the antenna tip (head capacity or roof capacity) and adapted to the feed line. This method of adjustment causes smaller losses and increases the bandwidth.
  • DE 22 62 522 C2 describes an antenna for meter or decimeter waves in the manner of a folding unipole Roof capacity suggested.
  • two antenna conductors approximately perpendicular to a base area are to be connected to a conductive disk acting as a roof capacitance via an inductor.
  • One of the antenna conductors is connected to the base area, the other forms the antenna base point in the area of the base area.
  • the inductance in this embodiment is formed in that the antenna conductors pass through the pane in an insulated manner, are guided along the side of the pane facing away from the base area and are galvanically connected to the pane at their respective ends.
  • a special embodiment provides for the pane to be formed from an insulating support, in particular epoxy glass, with suitable metallizations on both sides of the pane.
  • the antenna conductors standing between the pane and the base are in any case designed as wire-shaped line pieces.
  • Such an antenna will occupy an approximately cylindrical space of approximately 3 cm in diameter and 3 cm in height for the planned frequency. This seems too big for handheld devices.
  • the antenna is also very expensive to manufacture, since it has to be built up from individual parts, such as washers and antenna conductors, by soldering and riveting.
  • the theoretical isotropic gain of the antenna should be about 5 dB, which speaks for a clear bundling, and the bandwidth should be about 7% with a standing wave ratio of less than 2.
  • An antenna of the type mentioned in the introduction is known from US 48 76 709. This antenna is suitable for use in the shortwave range. From this Intended use results in the antenna having significantly smaller dimensions than the assigned wavelength.
  • the antenna is realized by a metallized surface, which is excited relative to the circuit board of the device.
  • the adaptation is carried out with the aid of two filters, one of which is intended for the transmitter and one for the receiver.
  • By using an additional shielding plate it is possible to minimize the influence of a user's hand on the signal transmission by adapting the antenna.
  • the switches required are removed from the area of the antenna.
  • GB 11 53 870 describes an antenna which has a capacitively loaded radiator to reduce the required overall height.
  • the antenna is operated as a parallel plate capacitor.
  • the object of the present invention is to construct an antenna of the type mentioned in the introduction in such a way that that high quality signal transmission can take place with a compact and inexpensive construction.
  • the antenna according to the invention is designed as a short linear antenna with head capacitance.
  • An extension coil is provided at the antenna base, which, together with the head capacitance, determines the frequency range of the antenna.
  • the extension coil is provided with a tap (autotransformer). The feed then takes place between the base point and the tap of the extension coil. They can be used in particular in the frequency range between 875 and 960 MHz.
  • the subclaims 2 to 4 relate to special configurations of the antenna according to the invention.
  • the head capacity of the antenna according to the invention is formed in particular by a flexible film.
  • a metal foil can be used as the foil.
  • metallized plastic films are to be used.
  • the metallized film is advantageously bent to increase the head capacity.
  • the bending line of the film should be approximately U-shaped.
  • the antenna counterweight for example an electrically conductive base area
  • the antenna counterweight itself on the flexible film, in particular made of plastic, by applying a metallization layer.
  • the head capacity is then relative Large-area metallized area formed on the film.
  • extension coils or economy transformers are designed to adapt as narrower conductor tracks. The conductor tracks are routed to the connection points on the antenna counterweight or the jacket of a coaxial line and to the inner conductor of the coaxial line.
  • the antenna counterweight is then designed as a large-area metallized area on the flexible plastic film.
  • a special embodiment provides for the antenna counterweight to be designed as a locking pot.
  • the counterweight or the conductive base area has a diameter that corresponds to half the wavelength of the desired antenna center frequency. If the base surface is not made flat, but curved, the surface should end after a quarter of the wavelength, as seen from the base point of the antenna. As a result, practically no more current flows at the edge of the base area, and the base area is electrically decoupled from the supply cable and the housing.
  • the locking pot is designed as part of the housing of the transmitting and receiving device.
  • the antenna with head capacity according to the invention is used in particular for handheld devices for communication according to the GSM standard.
  • the antenna according to FIG. 1 is arranged above an antenna counterweight (1) designed as an electrically conductive cap.
  • the antenna is formed from the head capacitance (2) in the form of the bent conductive surface, the approximately S-shaped extension coil (3) and the tap (5).
  • the approximately S-shaped extension coil (3) is connected on the one hand to the head capacitance (2) and on the other hand to the antenna counterweight (1) at the antenna base (4).
  • the antenna base (4) is connected to the outer conductor of a coaxial cable (7) designed as a feed cable.
  • the tap (5) is connected to the inner conductor of the feed cable.
  • the antenna is in a preferred embodiment as a printed circuit on an as flexible film trained substrate (6) realized.
  • the head capacitance (2), the extension coil (3) and the tap (5) are arranged on the substrate (6).
  • the substrate (6) is folded according to FIG. 4 by a line (9) in order to increase the head capacity (2).
  • the antenna with the folded substrate (6) is arranged in a plastic cap (8).
  • the plastic cap (8) sits on a base (10), in which a connector (not shown in the drawing) to the coaxial cable (7) can be arranged.
  • the connector is preferably inside the cap-shaped antenna counterweight (1).
  • the height of the plastic cap (8) is 27 mm in a special version and the height of the antenna counterweight (1) with base (10) in a special version is 70 mm.
  • the plastic cap (8) has a width of about 25 mm at its upper end in a special version.
  • the antenna counterweight (1) is either designed as a metallization of the plastic shell of the radio telephone, or as a sheet metal part inserted into the plastic shell of the radio telephone.
  • FIG. 5 shows a highly simplified equivalent circuit diagram of the antenna.
  • the capacity C represents the head capacity (2).
  • the radiation resistance is Rs and the antenna losses are summarized in Rv.
  • the extension coil with tap is represented by the inductances L1 and L2 and the mutual inductance M, and on the left (indicated by the arrow) the feeding 50-ohm line is shown.
  • Figure 6 shows an equivalent circuit with an ideal transformer and separate inductance.
  • the transmission ratio of the transmitter is ü.
  • a shortened antenna has a radiation resistance of about 10 ohms and the loss resistance is about 1 ohms.
  • a transmission ratio of ü2 Z.
  • Rv + Rs ü 2.1 required.
  • a bandwidth of 20% results for a standing wave ratio vswr ⁇ 2.

Landscapes

  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)
  • Transceivers (AREA)
  • Telephone Set Structure (AREA)

Claims (4)

  1. Antenne avec une capacité (2) au sommet, munie d'un contrepoids d'antenne et dont un pôle de la base est raccordé à une bobine d'auto-induction d'allonge caractérisée par le fait que la capacité au sommet (2) est constituée par une couche métallique déposée sur un support flexible (6), le support flexible étant replié pour augmenter la capacité au sommet (2) et que la bobine d'auto-induction d'allonge (3) d'adaptation à l'impédance d'un câble coaxial (7) de raccordement, se présente sous la forme d'un autotransformateur muni d'une prise (5) et que la bobine d'auto-induction (3) est reliée d'un côté à la capacité au sommet (2) et de l'autre côté au contrepoids d'antenne (1).
  2. Antenne selon la revendication 1, caractérisée par le fait que le support flexible (6) accommode, outre la capacité au sommet (2), l'autotransformateur et la bobine d'auto-induction (3) constitués de couches métalliques.
  3. Antenne selon la revendication 1 ou 2, caractérisée par le fait que le contrepoids d'antenne est constitué d'un circuit bouchon.
  4. Antenne selon la revendication 3, caractérisée par le fait que le circuit bouchon est constitué par une partie du boîtier de l'appareil émetteur-récepteur.
EP92105739A 1991-04-19 1992-04-03 Antenne avec capacité en sommet pour téléphone mobile Expired - Lifetime EP0509339B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4113277A DE4113277C2 (de) 1991-04-19 1991-04-19 Antenne für ein mobiles Telefon
DE4113277 1991-04-19

Publications (2)

Publication Number Publication Date
EP0509339A1 EP0509339A1 (fr) 1992-10-21
EP0509339B1 true EP0509339B1 (fr) 1995-03-01

Family

ID=6430199

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92105739A Expired - Lifetime EP0509339B1 (fr) 1991-04-19 1992-04-03 Antenne avec capacité en sommet pour téléphone mobile

Country Status (5)

Country Link
EP (1) EP0509339B1 (fr)
AT (1) ATE119319T1 (fr)
DE (2) DE4113277C2 (fr)
DK (1) DK0509339T3 (fr)
ES (1) ES2072042T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000030209A1 (fr) * 1998-11-13 2000-05-25 Allgon Ab Dispositif de radiocommunication portable et antenne associee a charge capacitive terminale

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100193851B1 (ko) * 1996-11-05 1999-06-15 윤종용 휴대용 무선기기의 소형 안테나
DE19707535A1 (de) * 1997-02-25 1998-08-27 Rothe Lutz Dr Ing Habil Folienstrahler
GB2323476B (en) * 1997-03-20 2002-01-16 David Ganeshmoorthy Communication antenna and equipment
SE9804498D0 (sv) 1998-04-02 1998-12-22 Allgon Ab Wide band antenna means incorporating a radiating structure having a band form
JP2000077923A (ja) * 1998-09-01 2000-03-14 Nippon Antenna Co Ltd 車載用アンテナ
SE522492C2 (sv) * 2000-10-27 2004-02-10 Ericsson Telefon Ab L M Antennanordning för en mobilterminal
KR100442453B1 (ko) * 2001-10-31 2004-07-30 김영준 무선통신용 앤엑스 안테나

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1153870A (en) * 1966-06-09 1969-05-29 Walter Karl Volkers Improvements in or relating to Antennas
BE792553A (fr) * 1971-12-22 1973-06-12 Lannionnais Electronique Antenne radioelectrique de faibles dimensions
GB2066580A (en) * 1979-12-22 1981-07-08 Polytechnic Marine Ltd Antenna
US4328501A (en) * 1980-04-23 1982-05-04 The United States Of America As Represented By The Secretary Of The Army Small broadband antennas using lossy matching networks
FR2498819B1 (fr) * 1981-01-23 1985-05-31 Thomson Csf Antenne de petite dimension
JPH01321738A (ja) * 1988-06-24 1989-12-27 Nec Corp 携帯無線電話機の保護ケース
US4876709A (en) * 1988-09-08 1989-10-24 Dynascan Corporation Antenna for cordless telephone system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000030209A1 (fr) * 1998-11-13 2000-05-25 Allgon Ab Dispositif de radiocommunication portable et antenne associee a charge capacitive terminale

Also Published As

Publication number Publication date
DE4113277C2 (de) 1996-08-08
ES2072042T3 (es) 1995-07-01
DK0509339T3 (da) 1995-07-10
DE4113277A1 (de) 1992-10-22
EP0509339A1 (fr) 1992-10-21
DE59201497D1 (de) 1995-04-06
ATE119319T1 (de) 1995-03-15

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