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WO1999048167A1 - Dispositif d'antenne pourvu d'un organe de fixation magnetique et d'un organe de couplage de mise a la terre pouvant fonctionner a des frequences multiples - Google Patents

Dispositif d'antenne pourvu d'un organe de fixation magnetique et d'un organe de couplage de mise a la terre pouvant fonctionner a des frequences multiples Download PDF

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Publication number
WO1999048167A1
WO1999048167A1 PCT/SE1999/000430 SE9900430W WO9948167A1 WO 1999048167 A1 WO1999048167 A1 WO 1999048167A1 SE 9900430 W SE9900430 W SE 9900430W WO 9948167 A1 WO9948167 A1 WO 9948167A1
Authority
WO
WIPO (PCT)
Prior art keywords
conductor
ground
magnetic fastening
metal member
fastening means
Prior art date
Application number
PCT/SE1999/000430
Other languages
English (en)
Inventor
Patrik STRÖMSTEDT
Eddie Johannisson
Hassan Shalalvand
Erik Engwall
Original Assignee
Smarteq Ab
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 Smarteq Ab filed Critical Smarteq Ab
Priority to EP99914841A priority Critical patent/EP1064692A1/fr
Priority to AU33495/99A priority patent/AU3349599A/en
Publication of WO1999048167A1 publication Critical patent/WO1999048167A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/32—Vertical arrangement of element
    • 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
    • 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
    • H01Q1/14—Supports; Mounting means for wire or other non-rigid radiating elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • H01Q1/325—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle
    • H01Q1/3275—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle mounted on a horizontal surface of the vehicle, e.g. on roof, hood, trunk
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
    • H01Q5/321—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors within a radiating element or between connected radiating elements

Definitions

  • the invention relates to an antenna device for micro wave radio communication comprising feed connection means having a hot conductor and a ground conductor for connecting said device to a radio transceiver, magnetic fastening means having first and second opposed sides for fastening at its first side said device to a steel body to be acting as a ground plane means conductive ground coupling means connected to said ground conductor, radiator means connected to said hot conductor .
  • Antenna devices have been marketed and sold by the applicant in a single band version under Order No. 1140.3 form the prior art closest to the invention.
  • those antenna devices fail to provide a desired dual band operability and include a relatively complicated and environmentally sensitive arrangement of a base portion.
  • the main object of the invention to provide an improved durable and cost-effective antenna device, in particular including magnetic fastening means and being operative at two frequency bands.
  • This object is attained by device of the appended claims.
  • the dependent claims recite various enhancements of the invention in attaining above mentioned objects.
  • Several different types of ground structures may be employed alternatively in the invention, as will be evident from the detailed description below. Brief description of the drawings
  • the sole figure of the drawing shows the in a partially sectional view a preferred embodiment of an antenna device according to the invention and a ground plane to which it is to be fastened.
  • the antenna means is generally rotationally symmetrical in relation to a longitudinal axis, except in an arrangement for entering a cable into the device.
  • the depicted antenna device has a base portion 1 and a radiator portion 2.
  • the antenna device in the disclosed embodiment is intended to serve as an auxiliary antenna for a hand portable mobile telephone (not shown) when traveling in an automobile having a body including a steel panel 3 acting as a ground plane.
  • the steel panel generally includes an external protective layer 4, such as paint.
  • the mobile telephone is connected via a coaxial cable 5, shown partially, to the inventive antenna device .
  • the base portion 1 and the radiator portion 2 are to be interlocked by threaded means 6 and 7 of the respective portions 1 and 2 so that surfaces 8 and 9 abut each other.
  • the base portion 1 includes a first non-conductive housing 11 that hermetically seals an internal cavity 12 formed therein. Specifically, it is preferred for durability reasons that the housing 11 forms integrally the surface 10 that is to physically contact the steel panel 3.
  • the base portion 3 further includes a cable aperture 13 and a radiator aperture 14. The cable 5 being entered fixedly through the cable aperture, a center conductor 15 of the cable 5 is connected to a first lower rod radiator portion 16.
  • the portion 16 is further connected to a second lower rod radiator portion 17.
  • the portion 17 is further connected to a third lower rod radiator portion 18.
  • the portion 18 is further connected to a helix radiator portion 19.
  • the portion 19 is further connected to an upper rod radiator portion 20.
  • the portions 17 - 20 are enclosed in a second non-conductive housing 21.
  • An outer conductor 22 of the cable 5 is contacted and held fixedly by a generally circular fastening steel plate 23 by means of fastening tab means 24 formed integrally in the plate 23.
  • the tab means 24 holds and contacts the outer conductor 22 by pressure achieved through deformation or, possibly, soldering is used.
  • the plate 23 is arranged in parallel to the surface 10. Between the plate 23 and the surface 10 there is provided a disk magnet 25 that is to fasten the antenna means to the steel panel 3 by means of magnetic attraction. Also, the plate 23 is held closely to the magnet disk 25 by means of magnetic attraction. Thus, the outer conductor 22 is coupled conductively and capacitively to the steel panel 3.
  • the preferred antenna device operate at frequencies in the order of 1 MHz. Consequently a sufficient coupling between the outer conductor 22 and the steel panel 3 is achievable by only a few square centimeters of capacitor area of the plate 23 and the magnet 25.
  • the antenna means is intended for operation within a lower and an upper, or more, relatively widely separated frequency bands, for example, frequency bands about 900 and 1800 MHz, respectively.
  • Such dual band operation is achieved in the invention by means of a distributed parallel resonance circuit formed by the helix radiator portion 19.
  • the portion 19 essentially passes signals in the lower frequency band and blocks those of the upper frequency band.
  • the function of portion 19 is achieved by selecting appropriate axial length, winding diameter, thread thickness, and pitch thereof such that capacitances between the helix turns provide cut off at the upper band. It is essential to the dual band operation of the antenna to select the helix pitch and thread diameter, such that the pitch is essentially equal to or greater than the thread diameter, in order to cope with variations in manufacturing and possible deformation of the portion 19 due to physical impact.
  • the portions 16 - 20 provide the combined radiator, while, at the upper band, the portions 16 - 18 and a fraction of portion 19 only provide the combined antenna function.
  • a blocking filter function of the upper band is achieved by means of the helix.
  • an antenna constructed in accordance with the one depicted in the drawings performs well in dual band operation, in the GSM 900 MHz and DCS 1800 MHz systems, having the following dimensions: 0.5 mm diameter of thread in portions 18, 19, 20; 39.5 mm total length of portions 16, 17, 18; 3 mm outer diameter, 1 mm pitch and 13.5 turns of helix portion 19.
  • the magnet disc 25, the plate 23, and surface 10 are designed to provide a sufficient attraction and friction force when the antenna device is mounted on an automobile roof. It is to be understood that the inventive concept and scope of the invention are defined by the appended claims only.

Landscapes

  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)

Abstract

L'invention concerne un dispositif d'antenne servant pour des radiocommunications à micro-ondes, comprenant un organe de connexion d'alimentation possédant un conducteur sous tension et un conducteur de mise à la terre de façon à connecter ledit dispositif à un émetteur-récepteur radio; un organe de fixation magnétique possédant un premier et un second côtés opposés destinés à fixer le dispositif, au niveau de son premier côté, à un corps en acier qui réagit comme un organe de mise à la terre; un organe de couplage conducteur de mise à la terre connecté à un conducteur de mise à la terre; un ensemble radiateur (16-20) comprenant un filtre (19) hélicoïdal et connecté au conducteur sous tension. L'organe de couplage de mise à la terre comprend un organe de fixation (25) magnétique et un élément métallique (23) adjacent au second côté de l'organe de fixation (25) magnétique, l'élément métallique (23) et l'organe de fixation (25) magnétique étant disposés de façon à créer un contact radiofréquence avec le corps en acier qui agit comme un plan masse.
PCT/SE1999/000430 1998-03-19 1999-03-18 Dispositif d'antenne pourvu d'un organe de fixation magnetique et d'un organe de couplage de mise a la terre pouvant fonctionner a des frequences multiples WO1999048167A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP99914841A EP1064692A1 (fr) 1998-03-19 1999-03-18 Dispositif d'antenne pourvu d'un organe de fixation magnetique et d'un organe de couplage de mise a la terre pouvant fonctionner a des frequences multiples
AU33495/99A AU3349599A (en) 1998-03-19 1999-03-18 Antenna device having magnetic fastening means and ground coupling means capable of operating at multiple frequencies

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9800929A SE518868C2 (sv) 1998-03-19 1998-03-19 Antennanordning med magnetisk fastsättningsanordning och jordkopplingsorgan för drift vid flertal frekvenser
SE9800929-3 1998-03-19

Publications (1)

Publication Number Publication Date
WO1999048167A1 true WO1999048167A1 (fr) 1999-09-23

Family

ID=20410622

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1999/000430 WO1999048167A1 (fr) 1998-03-19 1999-03-18 Dispositif d'antenne pourvu d'un organe de fixation magnetique et d'un organe de couplage de mise a la terre pouvant fonctionner a des frequences multiples

Country Status (4)

Country Link
EP (1) EP1064692A1 (fr)
AU (1) AU3349599A (fr)
SE (1) SE518868C2 (fr)
WO (1) WO1999048167A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1182726A3 (fr) * 2000-08-21 2002-08-21 Harada Industry Co., Ltd. Antenne tige montée sur un véhicule
EP1280233A4 (fr) * 2000-04-13 2004-12-22 Mitsubishi Electric Corp Element d'antenne et terminal de communication portable
WO2007104568A1 (fr) * 2006-03-16 2007-09-20 Kathrein-Werke Kg Antenne tige multibande à ressort spiral pour véhicules à moteur et procédé de fabrication associé

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE501841C2 (sv) * 1994-06-29 1995-06-06 Carant Antenn Ab Magnetfot för antenn

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4794319A (en) * 1986-07-03 1988-12-27 Alliance Research Corporation Glass mounted antenna
AU8749791A (en) * 1990-12-05 1992-07-08 Les Wallen Manufacturing Limited Isolated antenna bases
GB9612826D0 (en) * 1996-06-19 1996-08-21 Ford Motor Co Improved vehicular radio antennas

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE501841C2 (sv) * 1994-06-29 1995-06-06 Carant Antenn Ab Magnetfot för antenn

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN; & JP 9219621 A (KYOCERA CORP) 19 August 1997. *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1280233A4 (fr) * 2000-04-13 2004-12-22 Mitsubishi Electric Corp Element d'antenne et terminal de communication portable
EP1182726A3 (fr) * 2000-08-21 2002-08-21 Harada Industry Co., Ltd. Antenne tige montée sur un véhicule
US6486843B2 (en) 2000-08-21 2002-11-26 Harada Industry Co., Ltd. On-vehicle rod antenna device
WO2007104568A1 (fr) * 2006-03-16 2007-09-20 Kathrein-Werke Kg Antenne tige multibande à ressort spiral pour véhicules à moteur et procédé de fabrication associé

Also Published As

Publication number Publication date
SE9800929D0 (sv) 1998-03-19
AU3349599A (en) 1999-10-11
EP1064692A1 (fr) 2001-01-03
SE9800929L (sv) 1999-09-20
SE518868C2 (sv) 2002-12-03

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