EP0718909A2 - Antenne rétractable à charge en sommet - Google Patents

Antenne rétractable à charge en sommet Download PDF

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Publication number
EP0718909A2
EP0718909A2 EP95308453A EP95308453A EP0718909A2 EP 0718909 A2 EP0718909 A2 EP 0718909A2 EP 95308453 A EP95308453 A EP 95308453A EP 95308453 A EP95308453 A EP 95308453A EP 0718909 A2 EP0718909 A2 EP 0718909A2
Authority
EP
European Patent Office
Prior art keywords
antenna
helical
elongate
antenna assembly
assembly according
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
EP95308453A
Other languages
German (de)
English (en)
Other versions
EP0718909B1 (fr
EP0718909A3 (fr
Inventor
Brian James Davidson
Stephen Goodwin
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.)
Nokia Oyj
Original Assignee
Nokia Mobile Phones Ltd
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 Nokia Mobile Phones Ltd filed Critical Nokia Mobile Phones Ltd
Publication of EP0718909A2 publication Critical patent/EP0718909A2/fr
Publication of EP0718909A3 publication Critical patent/EP0718909A3/en
Application granted granted Critical
Publication of EP0718909B1 publication Critical patent/EP0718909B1/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
    • 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
    • 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
    • H01Q1/362—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith for broadside radiating helical antennas

Definitions

  • the invention relates to an antenna assembly having a retractable antenna comprising a helical antenna element carried by an elongate antenna element which may be applied, for example, to a portable radio and, in particular to a hand portable radio telephone.
  • Retractable antennas are of particular benefit in portable radio telephones as they enable the telephone to be conveniently carried by a user when the antenna is in the retracted position while providing appropriate operating characteristics in both the retracted and the extended positions.
  • US patent No. 4,868,576 describes an antenna for a portable cellular telephone comprising a helical coil at the base of a retractable elongate radiating element.
  • the retractable element which extends through the helical coil, has non-conductive portions at its two ends whereby the elongate element is capacitatively coupled to the helical coil, and in the retracted position the elongate element is substantially decoupled therefrom.
  • the helical coil is fixedly mounted on the housing of the radio transceiver.
  • the elongate element and the helical element are electrically isolated.
  • This enables matching networks to be provided to ensure that the characteristic impedance to the feed point is the same when the antenna is retracted and extended.
  • the matching network includes a coaxial feed that supplies both the extended and the retracted antenna, the elongate antenna providing the central conductor of the coaxial feed when in the retracted condition. In this solution there are currents flowing within the case of the portable telephone when the antenna is retracted which create stray fields that might interfere with correct circuit operation.
  • an antenna assembly comprising an elongate antenna element mounted in a support and movable between a retracted position and an extended position, a helical antenna element in electrical contact with, and carried by, the elongate antenna element, means for feeding the elongate antenna in the extended position from an end remote from the helical antenna, means for grounding the helical antenna in the retracted position at a ground point adjacent the elongate antenna element such that currents are substantially inhibited in the elongate element, and means for feeding the helical element in the retracted position.
  • the means for grounding the helical antenna may ground the helical antenna at a position approaching the end of the elongate antenna adjacent the helical element. The closer the grounding point is to the top of the elongate antenna, the shorter the distance currents can travel on the eleongate element within the casing. As a result, stray fields are correspondingly reduced.
  • the elongate antenna is preferably further grounded in the retracted position at the end remote from the helical element shown in drawings. This provides an additional ground to further inhibit stray currents in the elongate element and the consequent stray fields.
  • the helical element is preferably fed via a reactive coupling in the retracted position.
  • This enables the impedance at the feed position in the retracted and the extended positions to be substantially equivalent.
  • the exact nature of the reactive coupling can be adjusted to suit a particular antenna.
  • the matching impedance can be kept the same in both situations allowing the helical element to be electrically coupled to the elongate element. This increases the gain of the antenna in the extended condition over an antenna of commensurate dimensions in which the helical and elongate elements are electrically isolated.
  • using the same matching network can reduce the number of components of the antenna assembly reducing cost and providing less size restraints allowing the design to be more compact.
  • the reactive coupling may be a tap coupled to a tapping point on the helical element.
  • a further reactive shunt element may be necessary at the feed point for the retracted antenna in order to attain a match.
  • the actual element for a particular antenna can be chosen to allow discrepancies in the impedance between the retracted and extended positions to be tuned out.
  • the reactive coupling is preferably only used to feed the antenna in the retracted position. However, the same feed point is preferably used to feed the antenna in both positions.
  • One manner in which the impedance can be matched with the antenna in each of the positions is by using a capacitative shunt.
  • This may be provided by an insulative member fixed relative to the support to form a coaxial system.
  • RF signals are fed onto an outer conductor.
  • the inner conductor which is the elongate antenna is grounded and a capacitance is thus formed to earth.
  • a conductive member coupled to and carried by the helical element is coupled to the outer conductor of the coaxial system in the retracted position. In the extended position there is no coupling between the conductive member and the outer conductor of the coaxial system and so the helical element is not fed via the tapping point.
  • This arrangement has the advantage that the feeding arrangement is changed as a result of moving the antenna between the extended and retracted positions.
  • the conductive member may be configured to form a collet depending from the helical element.
  • the conductive member is a spring loaded pin biased for contact with the outer conductor of the coaxial system when in the retracted position.
  • the reactive coupling may include a second helical element insulated from and wound in the opposite sense to the first helical element.
  • Another way in which the problem associated with field cancellation below the tapping point can be reduced is by winding the helical element more tightly below the tap such that the non radiating length of the helical element resulting from the feed point of the helical in the retraced position is reduced.
  • the term 'elongate antenna element' as used herein encompasses, for example, a rod type antenna or a coil type antenna having a generally elongate configuration.
  • the term 'helical' is not restricted to a helix having a uniform diameter but is intended to include a coil having a progressively widening diameter, viz. a spiral configuration.
  • the radio telephone shown in the Figures comprises a housing 1 enclosing a conventional transmitter 2 and receiver 3 coupled respectively via a duplexer 4 to the antenna assembly.
  • the housing 1 also encloses all the other features conventionally found in a portable cellular telephone. Since these aspects are not directly relevant to the instant invention no further details will be given here.
  • the antenna assembly provided adjacent the top face of the radio housing 1, comprises a support 5 in the form of a tube. This provides a guide for retraction and extension of the antenna.
  • the antenna assembly comprises two distinct antenna elements, namely an elongate antenna element 11 and a helical element 12.
  • the elongate element comprises a central conductor 7 which may be a solid rod antenna or, alternatively, may be in the form of a close-wound coil which not only enhances flexibility of the elongate element and so reduces the risk of breakage, but also reduces the physical length of the antenna.
  • the coil may be made of silver plated beryllium-copper wire.
  • the elongate antenna element 11 may be chosen to have an equivalent electrical length, for example, one quarter of a wavelength.
  • the conducting portion 7 of the elongate element 11 is enclosed within an insulating sleeve 8 made for example from a flexible plastics material. A further conductive sleeve 7a allows the conducting portion 7 to be grounded in the retracted position.
  • the end of the elongate antenna element 11 remote from the support 5 carries a helical antenna element 12.
  • the helical coil 12 is very compact and has a short physical length but is wider in diameter than the elongate antenna element 11.
  • the effective electrical length of the helical antenna element 12 is, for example, one quarter of a wavelength.
  • the helical coil 12 is embedded in a dome-shaped dielectric encapsulation 14.
  • the helical antenna element 12 is permanently electrically connected to the conducting portion 7 of the elongate antenna element 11 to provide additional gain when the antenna is extended.
  • the elongate antenna 11 is, for example, quarter of a wavelength to provide a 3/8-5/8 antenna.
  • the lower end of the helical coil 12 is also electrically connected to a contact member in the form of a collet 15 which protrudes from the underside of the encapsulation 14.
  • a complementary conductive collet 16 is provided on the support 5. In the retracted position the elongate antenna element is substantially entirely enclosed within the casing of the phone. It slides within the support 5 to maintain a proper position within the phone. This can take the form of an earth plate or other suitable connection.
  • the collet 15 depending from the helical antenna element 12 engages the complementary collet 16.
  • the insulating sleeve 8 provided between the collet 16 and the conducting portion 7 together with the conducting collet 16 provides a transmission line for feeding the helical element in the retracted position.
  • the material and thickness of the insulating sleeve is chosen to provide a desired capacitance to earth.
  • a tap 17 is provided to couple the complementary collet and the helical element at a position remote from the base of the helical element.
  • a ground contact 18 is made to the conductive sleeve 7a of the elongate antenna element which is thus rendered inactive as a radiating element when in the retracted position.
  • the ground contact 18 floats and the conducting portion 7 of the elongate element is fed through the collet 16. As the helical element 12 is in electrical contact with the conducting portion 7 of the elongate element, it too is fed via the collet 16 and the conductive portion 7 in this position.
  • collet 15 is relatively widely spaced from the internal conductor 7 this reduces problems associated with capacitance between the collet 15 and the internal conductor 7 when extended.
  • the collet 15 can be replaced with a spring loaded pin 20 as shown in Figure 3.
  • the spring loaded pin 20 makes contact with the complementary collet 16 and feeds the tap 17 on the helical element when the antenna is in the retracted position.
  • the input impedance Z i of the antenna is substantially the same when the elongate antenna element is respectively extended and retracted despite the different nature of the antenna in the two cases.
  • the antenna is fed through the same feed point 21 regardless of whether the antenna is extended or retracted. Since the helical antenna element 12 is connected to the conductive element 7 of the elongate antenna element 11 both elements are functionally active as a combined antenna in the extended position providing gain advantages.
  • Figures 4a and 4b illustrate the electrical connections made to the matching circuitry in the extended and retracted positions.
  • the antenna In the extended position ( Figure 4a) the antenna is connected to the feed point 21 of RF circuitry 22 at the end remote from the helical element.
  • the feed point 21 In the retracted position ( Figure 4b), the feed point 21 feeds and receives RF signals to the helical element via the tap 17.
  • the elongate antenna is grounded by a ground plate 23 near to its top.
  • the elongate element is also grounded 24 at the end remote from the helical element.
  • the helix does not radiate as well with the tap as it would without it. This is because the component of current in the helical element flowing in the direction of the elongate antenna below the tapping point 17 and the current flowing in the tap itself are opposite in polarity and cancel to some extent.
  • the turns of the helix below 26 the tapping point 17 are wound more tightly than those above 25 the tapping point 17. This can be seen in Figure 5.
  • FIG. 6 shows another embodiment of the invention.
  • a second helical antenna element 27 is provided between the feed point 21 in the retracted position and the helical antenna element 12.
  • This second helix 27 is insulated from, and wound in the opposite sense to, the helical element 12 connected to the conductive element 7 of the elongate antenna element 11.
  • the current flowing in the second helix 27 in the direction of the elongate element (A) induces a current in the helical element 2 in that same direction (B).
  • the components of the current in the direction of the elongate element therefore add in phase. Since it is this component which gives the predominant radiation resistance in normal mode, this also improves radiation from the helical element 12 in the retracted case.
  • the present invention includes any novel feature or combination of features disclosed herein either explicitly or implicitly irrespective of whether or not it relates to the claimed invention or mitigates any or all of the problems addressed.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)
EP19950308453 1994-12-23 1995-11-24 Antenne rétractable à charge en sommet Expired - Lifetime EP0718909B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9426229A GB2296603B (en) 1994-12-23 1994-12-23 Retractable top load antenna
GB9426229 1994-12-23

Publications (3)

Publication Number Publication Date
EP0718909A2 true EP0718909A2 (fr) 1996-06-26
EP0718909A3 EP0718909A3 (fr) 1996-08-07
EP0718909B1 EP0718909B1 (fr) 2003-08-06

Family

ID=10766593

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950308453 Expired - Lifetime EP0718909B1 (fr) 1994-12-23 1995-11-24 Antenne rétractable à charge en sommet

Country Status (4)

Country Link
EP (1) EP0718909B1 (fr)
JP (1) JPH08237013A (fr)
DE (1) DE69531442T2 (fr)
GB (1) GB2296603B (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997042680A1 (fr) * 1996-05-03 1997-11-13 Allgon Ab Dispositif d'antenne pourvu d'un organe d'accord
FR2750260A1 (fr) * 1996-06-19 1997-12-26 Motorola Inc Ensemble d'antenne integree pour une radio et procede de fabrication
DE19715726A1 (de) * 1997-04-15 1998-10-29 Siemens Ag Antennenvorrichtung für Mobilfunkgeräte
WO1998053523A1 (fr) * 1997-05-20 1998-11-26 Ericsson Inc. Radiotelephones et systeme de commutation d'adaptation d'antenne
WO1999017399A1 (fr) * 1997-09-29 1999-04-08 Ericsson, Inc. Systemes d'adaptation a point d'alimentation unique
WO1999034476A1 (fr) * 1997-12-31 1999-07-08 Ericsson, Inc. Antennes retractables de radiotelephones possedant des sources d'alimentation allongees
WO1999049535A1 (fr) * 1998-03-20 1999-09-30 Ericsson Inc. Antenne radio avec element integre adapte a l'impedance
WO1999050927A1 (fr) * 1998-04-01 1999-10-07 Allgon Ab Elements d'antenne, procede de fabrication associe et dispositif de radiocommunication portatif
WO2000003454A1 (fr) * 1998-07-08 2000-01-20 Ericsson, Inc. Antennes helicoidales retractables de radiotelephone a prise et a deux bandes
US6140973A (en) * 1997-01-24 2000-10-31 Lk-Products Oy Simple dual-frequency antenna
EP1478046A1 (fr) * 2003-05-12 2004-11-17 Sony International (Europe) GmbH Structure de charge pour une antenne

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5812093A (en) * 1995-09-29 1998-09-22 Motorola, Inc. Antenna assembly for a wireless-communication device
JP2692670B2 (ja) * 1995-12-28 1997-12-17 日本電気株式会社 携帯無線機用アンテナ
JPH1032410A (ja) * 1996-07-12 1998-02-03 Saitama Nippon Denki Kk 携帯無線機用アンテナ
GB2364176A (en) * 2000-06-30 2002-01-16 Nokia Mobile Phones Ltd Multi-mode antenna

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4868576A (en) 1988-11-02 1989-09-19 Motorola, Inc. Extendable antenna for portable cellular telephones with ground radiator

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK168346B1 (da) * 1991-03-19 1994-03-14 Dancall Telecom As Antennekonstruktion med udtrækkeligt antenneelement
GB2257835B (en) * 1991-07-13 1995-10-11 Technophone Ltd Retractable antenna
JP2574256Y2 (ja) * 1993-02-19 1998-06-11 松下電器産業株式会社 アンテナ装置
AU673037B2 (en) * 1993-02-25 1996-10-24 Anten Corporation Antenna for a radio communication apparatus
JP2520557B2 (ja) * 1993-02-26 1996-07-31 日本電気株式会社 無線機用アンテナ

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4868576A (en) 1988-11-02 1989-09-19 Motorola, Inc. Extendable antenna for portable cellular telephones with ground radiator

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6097342A (en) * 1996-05-03 2000-08-01 Allgon Ab Antenna device having a matching means
WO1997042680A1 (fr) * 1996-05-03 1997-11-13 Allgon Ab Dispositif d'antenne pourvu d'un organe d'accord
US5973646A (en) * 1996-05-03 1999-10-26 Allgon Ab Antenna device having a matching means
FR2750260A1 (fr) * 1996-06-19 1997-12-26 Motorola Inc Ensemble d'antenne integree pour une radio et procede de fabrication
US6140973A (en) * 1997-01-24 2000-10-31 Lk-Products Oy Simple dual-frequency antenna
DE19715726C2 (de) * 1997-04-15 2001-08-30 Siemens Ag Antennenvorrichtung für Mobilfunkgeräte
DE19715726A1 (de) * 1997-04-15 1998-10-29 Siemens Ag Antennenvorrichtung für Mobilfunkgeräte
WO1998053523A1 (fr) * 1997-05-20 1998-11-26 Ericsson Inc. Radiotelephones et systeme de commutation d'adaptation d'antenne
US5969683A (en) * 1997-05-20 1999-10-19 Ericsson Inc. Radiotelephones with antenna matching switching system configurations
KR100413585B1 (ko) * 1997-09-29 2004-01-07 에릭슨 인크. 단일 피드점 정합 시스템
WO1999017399A1 (fr) * 1997-09-29 1999-04-08 Ericsson, Inc. Systemes d'adaptation a point d'alimentation unique
WO1999034476A1 (fr) * 1997-12-31 1999-07-08 Ericsson, Inc. Antennes retractables de radiotelephones possedant des sources d'alimentation allongees
US6097934A (en) * 1997-12-31 2000-08-01 Ericsson Inc. Retractable radiotelephone antennas with extended feeds
US6204816B1 (en) 1998-03-20 2001-03-20 Ericsson, Inc. Radio frequency antenna
WO1999049535A1 (fr) * 1998-03-20 1999-09-30 Ericsson Inc. Antenne radio avec element integre adapte a l'impedance
US6166697A (en) * 1998-04-01 2000-12-26 Allgon Ab Antenna means, a method for its manufacturing and a hand-held radio communication device
WO1999050927A1 (fr) * 1998-04-01 1999-10-07 Allgon Ab Elements d'antenne, procede de fabrication associe et dispositif de radiocommunication portatif
WO2000003454A1 (fr) * 1998-07-08 2000-01-20 Ericsson, Inc. Antennes helicoidales retractables de radiotelephone a prise et a deux bandes
US6336036B1 (en) 1998-07-08 2002-01-01 Ericsson Inc. Retractable dual-band tapped helical radiotelephone antennas
EP1478046A1 (fr) * 2003-05-12 2004-11-17 Sony International (Europe) GmbH Structure de charge pour une antenne

Also Published As

Publication number Publication date
GB2296603B (en) 1999-02-17
DE69531442D1 (de) 2003-09-11
GB9426229D0 (en) 1995-02-22
GB2296603A (en) 1996-07-03
EP0718909B1 (fr) 2003-08-06
DE69531442T2 (de) 2004-06-24
EP0718909A3 (fr) 1996-08-07
JPH08237013A (ja) 1996-09-13

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