WO2000003451A1 - Antenne double bande - Google Patents

Antenne double bande Download PDF

Info

Publication number
WO2000003451A1
WO2000003451A1 PCT/SE1999/001048 SE9901048W WO0003451A1 WO 2000003451 A1 WO2000003451 A1 WO 2000003451A1 SE 9901048 W SE9901048 W SE 9901048W WO 0003451 A1 WO0003451 A1 WO 0003451A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
conductor
loop
section
shaped conductor
Prior art date
Application number
PCT/SE1999/001048
Other languages
English (en)
Inventor
Carl Gustaf Blom
Original Assignee
Moteco 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 Moteco Ab filed Critical Moteco Ab
Priority to AU49402/99A priority Critical patent/AU4940299A/en
Publication of WO2000003451A1 publication Critical patent/WO2000003451A1/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
    • H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength
    • 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
    • H01Q1/243—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 with built-in antennas
    • H01Q1/244—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 with built-in antennas extendable from a housing along a given path
    • 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
    • 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
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • 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
    • 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
    • H01Q9/40—Element having extended radiating surface

Definitions

  • the present invention relates to a dual band antenna for a portable radiocommunications apparatus, a so-called mobile telephone, and comprises a supply conductor which is connected to the circuits of the mobile telephone.
  • the present invention has for its object to design the antenna intimated by way of introduction such that it has superior efficiency in two frequency bands, with extremely compact dimensions.
  • the present invention has for its object to design the antenna such that, without an intermediate connection of an adaptation network, it can be directly connected to the circuits of the mobile telephone and that it may be both simple and economical to manufacture and, when necessary, be cast in an insulator so as to form a discrete unit.
  • the antenna intimated by way of introduction is characterized in that the supply conductor is galvanically connected with or merges in a first antenna section which is approximately planar and which includes a number of loop-shaped conductor members which are mutually galvanically connected in series and which are disposed in sequence after one another in the longitudinal direction of the antenna, and that the loop-shaped conductor member located most distally from the supply conductor is galvanicallty connected with or merges in a second antenna section.
  • Fig. 1 schematically illustrates an upper portion of a mobile telephone and its antenna arrangement
  • Fig. 2 is a vertical plan view of an antenna included in the antenna arrangement of Fig. 1;
  • Fig. 3 shows the antenna of Fig. 2 seen from the left in that Figure
  • Fig.4 is an electric skeleton diagram of the antenna of Figs. 2 and 3. DESCRIPTION OF PREFERRED EMBODIMENT
  • the present invention has for its object to realise a dual band antenna which has nrinimal physical dimensions. It is particularly advantageous if the antenna can be given a flat appearance so that it may be placed at the rear side of the mobile telephone and as a result be spaced as far away as possible from the user's head.
  • the expression "flat” or “approximately planar” or similar expressions will be employed relating to the antenna and components included therein.
  • reference numeral 1 relates to a part of a hood of a portable radiocommunications apparatus, in daily parlance a mobile telephone, which includes electric circuits for transmitting and receiving radio waves within two different frequency bands.
  • the broken lines at reference numeral 2 show the outer contour of a casing which at least partly encloses the antenna unit according to the present invention.
  • the antenna unit includes a first antenna element 3 which is wholly enclosed inside the outer contour 2 and which is intended to function during stand-by position, paging mode.
  • the antenna unit further includes a second antenna element 4 which is intended to function in the talk position and which is designed to be excited or supplied by the first antenna element 3.
  • the second antenna element 4 is designed as a rod antenna which is displaceable in its longitudinal direction between a protracted, active position and an inactive position largely retracted in the hood.
  • the rod antenna 4 is long and may be set to ⁇ / 2 or ⁇ .
  • the detailed construction of one embodiment of the first antenna element 3 is apparent from Figs. 2 and 3 taken as whole.
  • the antenna element has a supply conductor 5 which is galvanically connected to the coaxial cable 6 which directly (without the interconnection of an adaptation network) connects the antenna to the electric circuits of the mobile telephone.
  • the coaxial cable 6 earths (grounds) the antenna in hood 1 of the mobile telephone or in an electrically conductive chassis which is located inside the hood and is illustrated by reference numeral 7.
  • the antenna includes a first antenna section 8 which is intended to function in the higher of the two frequency bands in which the antenna is to operate, and a second antenna section 9 which, together with the first antenna section 8, operates in the lower of the two frequency bands for which the antenna is constructed.
  • the two antenna sections 8 and 9 together form a substantially planar or flat unit which, in the thickness direction (at right angles to the plane of the paper in Fig. 2 and left to right in Fig. 3) is of considerably lesser extent than that which applies in the longitudinal direction 14 of the antenna and also in its width direction.
  • the thickness is less than the length by of the order of magnitude of a power of ten.
  • the first antenna section 8 includes three loop-shaped conductor members 10 disposed in sequence after one another and which, as will be apparent from Fig. 2, may be substantially circular and may be described as helical formations which comprise one turn and which have but insignificant pitch. While the loop-shaped conductor members 10 are illustrated as being circular, it is not necessary to give them the form of a perfect circle, but they may be elliptical, polygonal or an intermediate form in between.
  • the loop-shaped conductor members 10 have, in the illustrated embodiment, the same diameter and are disposed in line after one another, seen in the longitudinal direction of the antenna, and also have their centre points located on a straight line which is substantially parallel with the longitudinal direction of the antenna.
  • each loop-shaped conductor member 10 there is an overlap zone 11 where the conductor 12 which, counting from the supply conductor 5, is ingoing into the loop-shaped conductor member 10 and the outgoing conductor 13 which departs from it overlap or possibly intersect one another.
  • These ingoing and outgoing conductors are galvanically separate and discrete from one another in that, as is apparent from Fig. 3, interspaces 18 are disposed between the closely adjacent conductors.
  • the absence of galvanic contact between the conductors within the overlap zones 11 may be achieved in that the antenna element 3 is manufactured from a metal wire with an insulating layer.
  • the antenna element 3 may be produced with an inherent pretensioning which will have as a result that closely adjacent conductors within the overlap zones 11 strive away from one another. By casting in an insulating plastic material, the conductors are fixed in the correct position.
  • the loop-shaped conductor members 10 Seen in the longitudinal direction of the antenna, which is illustrated by the arrow 14, the loop-shaped conductor members 10 are spaced apart from one another as shown at reference numeral 15. This spacing may amount to half of the diameter of one loop-shaped conductor member but is preferably less and may possibly approach zero. On the other hand, it cannot be negative, which would imply that two loop-shaped conductor members 10 overlap one another in the longitudinal direction 14 of the antenna. The spacing 15 is equal throughout the entire length of the antenna.
  • the loop-shaped conductor member 10 which is located most distally from the supply conductor 5 has its outgoing conductor 13, a slight distance from the loop-shaped conductor member, bent transversely of the longitudinal direction 14 of the antenna, so that there is thereby formed a transverse conductor section 16. This is bent such that the straight conductor section 17 located after the bend will have a longitudinal direction which is substantially parallel with the longitudinal direction 14 of the antenna. Further, the orientation of the transverse conductor section 16 and the conductor section 17 is such that both conductor sections lie substantially in the same plane as the three loop-shaped conductor members 10.
  • the second antenna section 9 consists of at least the longitudinal, straight conductor section 17, but least certain parts of the transverse conductor section 16 may also be included therein.
  • a first antenna element 3 has been shown with two loop-shaped conductor members 10, while, in Figs. 2 and 3 an embodiment is shown with three loop-shaped conductor members 10.
  • the present invention it is possible to employ, in the antenna section 8, even four or possibly five loop-shaped conductor members, as long as the wire length which is consumed for producing the loop-shaped conductor member is approximately the same in the same frequency.
  • the wire length is approximately the same if the setting frequencies are the same.
  • an antenna section with four or five loop-shaped conductor members would have a smaller diameter for these members and at the same time have a greater length in the antenna section, counting in the longitudinal direction 14.
  • the first antenna element 3 connects directly to the circuits of the mobile telephone without the employment of an intermediate adapter network. This is possible, given that the antenna element 3 in itself forms an adapter network with both capacitative and inductive components.
  • Fig. 4 this is illustrated in that capacitances between closely adjacent wire portions are formed in the overlap zones 11. These adjacent wire portions are shown at the arrows C in the Figure.
  • the loop-shaped conductor members 10 form inductances which are illustrated by means of the arrows L.
  • each loop- shaped conductor member 10 may be represented by a capacitance C and an inductance L which are coupled in parallel with each other.
  • These groups which represent one loop-shaped conductor member 10 and which include a capacitance and an inductance, are connected in series, in sequence after one another and, in the end facing away from the coaxial cable 6 and the supply conductor 5, are connected to the second antenna section 9.
  • the antenna element 3 may be cast in a body of an electrically insulating material, for example plastic material, so that the antenna element 3 thereby forms a discrete unit.
  • an electrically insulating material for example plastic material
  • the different conductor members will also be fixed in relation to one another so that no change of the electric properties of the antenna, for example arising out of a change of the spacing 18 (Fig. 3) need be feared if the antenna were to be subjected to mechanical action.
  • the employed plastic material has a dielectricity constant which is greater than the dielectricity constant of air, a reduction of the physical dimensions of the antenna element will further be obtained.
  • the antenna is intended for the GSM and DCS bands.
  • the antenna is cast in a plastic material displaying a dielectricity constant of the order of magnitude of 2 to 2.5.
  • the wire employed for producing the antenna has a diameter of 1 mm.
  • the inner diameter of the loop-shaped conductor members is approximately 4 mm, and the spacing 15 between them is approximately 0.5 mm, while the distance between the transverse conductor section 16 and the uppermost loop-shaped conductor member is approximately 1 mm.
  • the length of the supply conductor 5 is approximately 2 mm counting up to the upper side of the lower loop-shaped conductor member.
  • the distance between the longitudinal conductor section 17 and the closely adjacent loop-shaped conductor members is approximately 1 mm.
  • the distance 18 is approximately 0.2 mm, while coated wires 12 and 13 may abut against one another.
  • the antenna element 3 has been described as manufactured from one-piece metal wire.
  • the antenna element 3 could just as well be manufactured with the aid of a double-sided circuit card, which thus has an electrically conductive coating on its opposing sides.
  • Fig. 2 that, for example, the supply conductor 5 and the upper half of the lowermost loop-shaped conductor member 10 is produced on that side of the circuit card turned to face the observer, while the lower half of the lower loop-shaped conductor member is produced on the rear side of the circuit card together with the upper half of the centremost loop-shaped conductor member, as well as the conductor which interconnected the two lower conductor members with one another.
  • the loop-shaped conductor members 10 have been described as being of equal size. In, for example, such situations where the outer form of the antenna is limited or determined beforehand, deviations from this rule may be made.
  • the diameter may vary in the different loop-shaped conductor members 10, for example reduce from the bottom of the antenna towards its top.
  • the centre points of them may be disposed along a curved line.
  • the ingoing conductor 12 to the lower loop- shaped conductor member 10 in Fig. 2 may extend an additional approximately 1/4 of a turn in a counterclockwise direction so that the supply conductor 5 will be located approximately centrally beneath the antenna.
  • the longitudinal conductor 17 it is possible to cause it to make an angle with the longitudinal direction 14. Further, it may be placed ahead of (or behind) the loop-shaped conductor members 10 in Fig. 2, as well as being placed to their left. In the latter case, a greater band width in the lower frequency band is to be expected.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)

Abstract

Antenne double bande pour téléphone dit téléphone mobile, comprenant un conducteur d'alimentation (5) connecté aux circuits du téléphone mobile. Le conducteur d'alimentation (5) est connecté galvaniquement à une première section d'antenne (8) sensiblement plane et présentant une pluralité de conducteurs en forme de boucles (10). Les conducteurs (10) sont connectés galvaniquement en série et sont disposés en séquence, l'un après l'autre, dans la direction longitudinale (14) de l'antenne. Le conducteur (10) le plus distal du conducteur d'alimentation (5) est connecté galvaniquement à une deuxième section d'antenne (9). La deuxième section d'antenne (9) est sensiblement rectiligne et essentiellement parallèle à la direction longitudinale (14) de l'antenne.
PCT/SE1999/001048 1998-07-09 1999-06-14 Antenne double bande WO2000003451A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU49402/99A AU4940299A (en) 1998-07-09 1999-06-14 A dual band antenna

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9802468A SE512363C2 (sv) 1998-07-09 1998-07-09 Dubbelbandig antenn
SE9802468-0 1998-07-09

Publications (1)

Publication Number Publication Date
WO2000003451A1 true WO2000003451A1 (fr) 2000-01-20

Family

ID=20412021

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1999/001048 WO2000003451A1 (fr) 1998-07-09 1999-06-14 Antenne double bande

Country Status (3)

Country Link
AU (1) AU4940299A (fr)
SE (1) SE512363C2 (fr)
WO (1) WO2000003451A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001099228A1 (fr) * 2000-06-22 2001-12-27 Telefonaktiebolaget Lm Ericsson (Publ) Antenne d'un appareil de communication portable, et appareil correspondant dote d'une telle antenne
WO2002049152A1 (fr) * 2000-12-12 2002-06-20 Moteco Ab Antenne
JP2006510321A (ja) * 2002-12-22 2006-03-23 フラクタス・ソシエダッド・アノニマ 移動通信デバイス用のマルチバンド・モノポール・アンテナ
US7423592B2 (en) 2004-01-30 2008-09-09 Fractus, S.A. Multi-band monopole antennas for mobile communications devices
US8738103B2 (en) 2006-07-18 2014-05-27 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US8941541B2 (en) 1999-09-20 2015-01-27 Fractus, S.A. Multilevel antennae

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5557293A (en) * 1995-01-26 1996-09-17 Motorola, Inc. Multi-loop antenna
EP0767508A2 (fr) * 1995-10-06 1997-04-09 Nokia Mobile Phones Ltd. Antenne

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5557293A (en) * 1995-01-26 1996-09-17 Motorola, Inc. Multi-loop antenna
EP0767508A2 (fr) * 1995-10-06 1997-04-09 Nokia Mobile Phones Ltd. Antenne

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9761934B2 (en) 1999-09-20 2017-09-12 Fractus, S.A. Multilevel antennae
US8941541B2 (en) 1999-09-20 2015-01-27 Fractus, S.A. Multilevel antennae
US8976069B2 (en) 1999-09-20 2015-03-10 Fractus, S.A. Multilevel antennae
US9000985B2 (en) 1999-09-20 2015-04-07 Fractus, S.A. Multilevel antennae
US10056682B2 (en) 1999-09-20 2018-08-21 Fractus, S.A. Multilevel antennae
US9054421B2 (en) 1999-09-20 2015-06-09 Fractus, S.A. Multilevel antennae
US9362617B2 (en) 1999-09-20 2016-06-07 Fractus, S.A. Multilevel antennae
US9240632B2 (en) 1999-09-20 2016-01-19 Fractus, S.A. Multilevel antennae
US7053839B2 (en) 2000-06-22 2006-05-30 Telefonaktiebolaget L M Ericsson (Publ) Antenna for a portable communication apparatus, and a portable communication apparatus comprising such an antenna
WO2001099228A1 (fr) * 2000-06-22 2001-12-27 Telefonaktiebolaget Lm Ericsson (Publ) Antenne d'un appareil de communication portable, et appareil correspondant dote d'une telle antenne
WO2002049152A1 (fr) * 2000-12-12 2002-06-20 Moteco Ab Antenne
US7403164B2 (en) 2002-12-22 2008-07-22 Fractus, S.A. Multi-band monopole antenna for a mobile communications device
US7411556B2 (en) 2002-12-22 2008-08-12 Fractus, S.A. Multi-band monopole antenna for a mobile communications device
US7675470B2 (en) 2002-12-22 2010-03-09 Fractus, S.A. Multi-band monopole antenna for a mobile communications device
JP2006510321A (ja) * 2002-12-22 2006-03-23 フラクタス・ソシエダッド・アノニマ 移動通信デバイス用のマルチバンド・モノポール・アンテナ
US8456365B2 (en) 2002-12-22 2013-06-04 Fractus, S.A. Multi-band monopole antennas for mobile communications devices
US8253633B2 (en) 2002-12-22 2012-08-28 Fractus, S.A. Multi-band monopole antenna for a mobile communications device
US7423592B2 (en) 2004-01-30 2008-09-09 Fractus, S.A. Multi-band monopole antennas for mobile communications devices
US9099773B2 (en) 2006-07-18 2015-08-04 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US9899727B2 (en) 2006-07-18 2018-02-20 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US8738103B2 (en) 2006-07-18 2014-05-27 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US10644380B2 (en) 2006-07-18 2020-05-05 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US11031677B2 (en) 2006-07-18 2021-06-08 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US11349200B2 (en) 2006-07-18 2022-05-31 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US11735810B2 (en) 2006-07-18 2023-08-22 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices

Also Published As

Publication number Publication date
SE9802468D0 (sv) 1998-07-09
SE512363C2 (sv) 2000-03-06
SE9802468L (sv) 2000-01-10
AU4940299A (en) 2000-02-01

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