EP1064692A1 - Antenna device having magnetic fastening means and ground coupling means capable of operating at multiple frequencies - Google Patents

Antenna device having magnetic fastening means and ground coupling means capable of operating at multiple frequencies

Info

Publication number
EP1064692A1
EP1064692A1 EP99914841A EP99914841A EP1064692A1 EP 1064692 A1 EP1064692 A1 EP 1064692A1 EP 99914841 A EP99914841 A EP 99914841A EP 99914841 A EP99914841 A EP 99914841A EP 1064692 A1 EP1064692 A1 EP 1064692A1
Authority
EP
European Patent Office
Prior art keywords
conductor
ground
magnetic fastening
metal member
fastening means
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.)
Ceased
Application number
EP99914841A
Other languages
German (de)
French (fr)
Inventor
Patrik STRÖMSTEDT
Eddie Johannisson
Hassan Shalalvand
Erik Engwall
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.)
Smarteq Wireless AB
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
Publication of EP1064692A1 publication Critical patent/EP1064692A1/en
Ceased legal-status Critical Current

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.

Abstract

An antenna device for microwave radio communication comprising feed connection means (5) having a hot conductor and a ground conductor for connecting said device to a radio transceiver, magnetic fastening means (25) having first and second opposed sides for fastening at its first side the device to a steel body to be acting as a ground plane means, conductive ground coupling means connected to the ground conductor, radiator means (16-20) including a helical filter means (19) and connected to the hot conductor. The ground coupling means including said magnetic fastening means (25) and a metal member (23) adjacent to the second side of the magnetic fastening means (25), wherein the metal member (23) and the magnetic fastening means (25) being arranged so as to provide radio frequency contact to the steel body to be acting as a ground plane.

Description

ANTENNA DEVICE HAVING MAGNETIC FASTENING MEANS AND GROUND COUPLING MEANS CAPABLE OF OPERATING AT MULTIPLE FREQUENCIES
Field of the invention
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 .
Related prior art
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. However, those antenna devices fail to provide a desired dual band operability and include a relatively complicated and environmentally sensitive arrangement of a base portion.
Summary of the invention
In view of the above, 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
It should be noted that the drawings are not necessarily drawn to exact shape, scale and proportions, but are intended to provide and facilitate understanding of the invention in order for a skilled person to apply the invention.
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.
Description of preferred embodiments
With reference to the figure, 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. In such use 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.
Further, surface 10 of the base portion 1 is to abut the steel panel 3. In operation the base portion 1 thus erects the radiator portion 2 generally perpendicularly of the steel panel 3 externally of the automobile body. An automobile roof is preferred as the ground plane, but various other ground plane means are possible to use. 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.
At the lower band, 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. Thus, a blocking filter function of the upper band is achieved by means of the helix.
Tests and simulations have shown that 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.

Claims

Claims
1. Ground plane dependent 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,
- said ground coupling means including said magnetic fastening means and a metal member adjacent to said second side of said magnetic fastening means,
- said metal member and said magnetic fastening means being arranged so as to provide radio frequency contact to the steel body to be acting as a ground plane, characterized by - a housing forming integrally a surface that is to physically contact said ground plane means, said housing thereby providing a hermetic enclosure of said magnetic fastening means .
2. Device of claim 1, wherein
- said metal member alone and in one piece provides RF contact between said outer conductor and said magnetic fastening means,
3. Device of any preceding claim, wherein
- said feed connection means includes a coaxial cable having an inner conductor and an outer conductor forming said hot and ground conductors, respectively,
- said metal member is conductively connected to said outer conductor.
4. Device of any preceding claim, wherein - said metal member includes a deformed portion providing by pressure a conductive contact to said ground conductor.
5. Device of any preceding claim, wherein - said metal member exhibits a conductive connection to said magnetic fastening means.
6. Device of any preceding claim, wherein
- said connection between said metal member and said magnetic fastening means is established through magnetic attraction.
7. Device of any preceding claim, wherein
- said metal member is made of steel.
8. Device of any preceding claim, further comprising:
- radiator means connected to said hot conductor and providing operability at first and second frequencies,
- said radiator means including first and second elongated radiating portions, - parallel resonance means spacing axially said first and second radiating portions and providing a radio frequency path at said first frequency and a radio frequency block at said second frequency,
- said parallel resonance means being helically configured and including plural consecutive turns,
- each of said consecutive turns being arranged to form an inductance and capacitance connected in parallel such that said path and block are attained.
9. Device of claim 8, further comprising:
- a wire forming at least part of said first elongated portion, said helically configured parallel resonance means, and said second elongated portion.
10. Device of claim 8 or 9, wherein - said helically configured parallel resonance means having a pitch and a conductor cross-sectional dimension (diameter of said wire) ,
- said pitch being greater than or equal to said cross- sectional dimension.
EP99914841A 1998-03-19 1999-03-18 Antenna device having magnetic fastening means and ground coupling means capable of operating at multiple frequencies Ceased EP1064692A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9800929A SE518868C2 (en) 1998-03-19 1998-03-19 Antenna device with magnetic attachment device and earth connection means for operation at multiple frequencies
SE9800929 1998-03-19
PCT/SE1999/000430 WO1999048167A1 (en) 1998-03-19 1999-03-18 Antenna device having magnetic fastening means and ground coupling means capable of operating at multiple frequencies

Publications (1)

Publication Number Publication Date
EP1064692A1 true EP1064692A1 (en) 2001-01-03

Family

ID=20410622

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99914841A Ceased EP1064692A1 (en) 1998-03-19 1999-03-18 Antenna device having magnetic fastening means and ground coupling means capable of operating at multiple frequencies

Country Status (4)

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

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1280233A4 (en) * 2000-04-13 2004-12-22 Mitsubishi Electric Corp Antenna element and portable communication terminal
JP3996331B2 (en) * 2000-08-21 2007-10-24 原田工業株式会社 Automotive rod antenna device
DE102006012193A1 (en) * 2006-03-16 2007-09-20 Kathrein-Werke Kg Rod antenna, in particular for motor vehicles

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE9402294L (en) * 1994-06-29 1995-06-06 Carant Antenn Ab Magnetic foot for antenna

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9948167A1 *

Also Published As

Publication number Publication date
SE9800929L (en) 1999-09-20
SE518868C2 (en) 2002-12-03
SE9800929D0 (en) 1998-03-19
AU3349599A (en) 1999-10-11
WO1999048167A1 (en) 1999-09-23

Similar Documents

Publication Publication Date Title
US6801166B2 (en) Planar antenna
US6292141B1 (en) Dielectric-patch resonator antenna
US5990848A (en) Combined structure of a helical antenna and a dielectric plate
US4621243A (en) Transmission channel coupler for antenna
US6246371B1 (en) Wide band antenna means incorporating a radiating structure having a band form
US5248988A (en) Antenna used for a plurality of frequencies in common
EP1306924A2 (en) Monopole antenna that can easily be reduced in height dimension
US6229488B1 (en) Antenna for receiving signals from GPS and GSM
US6232925B1 (en) Antenna device
KR20040028739A (en) Broad-band antenna for mobile communication
US5945958A (en) Loop antenna
EP0772255B1 (en) Multiband antenna with a distributed-constant dielectric resonant circuit, and multiband portable radio apparatus comprising such an antenna
US6064346A (en) Antenna assembly
US6448934B1 (en) Multi band antenna
US6778149B2 (en) Composite antenna apparatus
US5914691A (en) Antenna apparatus having magnetic-current-type and electric-field type antenna
JP4067049B2 (en) Multi-band antenna and manufacturing method thereof
US6501428B1 (en) Antenna device for dual frequency bands
US5777587A (en) Surface-mounted antenna
EP1064692A1 (en) Antenna device having magnetic fastening means and ground coupling means capable of operating at multiple frequencies
US6798388B2 (en) Stubby, multi-band, antenna having a large-diameter high frequency radiating/receiving element surrounding a small-diameter low frequency radiating/receiving element
US4613833A (en) Transmission channel coupler for antenna
US6307508B1 (en) Flat antenna
EP1267439B1 (en) Multiple frequency bands antenna using two concentric interleaved antennas, the external one being a meander line antenna
US6232930B1 (en) Dual band antenna and method of making same

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20001019

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: SMARTEQ WIRELESS AB

17Q First examination report despatched

Effective date: 20041004

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED

18R Application refused

Effective date: 20051220