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WO1992016980A1 - Structure d'antenne munie d'un element d'antenne extensible - Google Patents

Structure d'antenne munie d'un element d'antenne extensible Download PDF

Info

Publication number
WO1992016980A1
WO1992016980A1 PCT/DK1992/000086 DK9200086W WO9216980A1 WO 1992016980 A1 WO1992016980 A1 WO 1992016980A1 DK 9200086 W DK9200086 W DK 9200086W WO 9216980 A1 WO9216980 A1 WO 9216980A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
antenna element
transmission line
tube
rod
Prior art date
Application number
PCT/DK1992/000086
Other languages
English (en)
Inventor
Erik Bech
Original Assignee
Dancall Radio A/S
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 Dancall Radio A/S filed Critical Dancall Radio A/S
Priority to DE69201556T priority Critical patent/DE69201556T2/de
Priority to EP92907567A priority patent/EP0576531B1/fr
Publication of WO1992016980A1 publication Critical patent/WO1992016980A1/fr
Priority to GR950400839T priority patent/GR3015692T3/el

Links

Classifications

    • 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
    • H01Q1/08—Means for collapsing antennas or parts thereof
    • H01Q1/10—Telescopic elements

Definitions

  • the invention concerns an antenna construction, preferably for use in a portable telephone.
  • the antenna construction is of the type comprising a rod-shaped antenna element which is slidably moveable between two positions.
  • the US Patent Specification 4 890 114 tries to overcome precisely these problems by providing an antenna construc- tion with an extensible antenna element.
  • This antenna ele ⁇ ment is slidably moveable between two extreme positions, where in a first, active position for the telephone it is present substantially outside the case of the portable telephone. In a second position passive for the portable telephone, a considerable part of the antenna element is present within the case of the portable telephone, so that only the outermost, conductive tip protrudes from the case of the portable telephone. It is stated in this patent specification that this is sufficient to achieve a pre- determined reception sensitivity. However, the signal re ⁇ ceived by the short part of the antenna will be disturbed by reflections from the long, retracted part of the an ⁇ tenna.
  • the object of the invention is to provide an antenna con ⁇ struction of the type stated in the opening paragraph, where an antenna element is slidably moveable between two extreme positions, which antenna construction must be adapted to be able to receive calls in both of these po- sitions, without the antenna part introduced into the transmit/receive unit disturbing the active part of the antenna.
  • the length of the antenna element is chosen such that the part moved into the housing of the transmit/receive unit serves as a coaxial transmission line with a high impedance seen from the feed point of the short, active part of the antenna element.
  • the electrical length of the antenna element may be chosen such that the long, inserted part of the antenna element corresponds to an open half-wave transmission line.
  • Claim 3 defines an alternative embodi- ment where the inserted part is constructed as a quarter- wave transmission line which is short-circuited. This may be realized e.g.
  • the impedance of the antenna element part received in the housing of the transmit/receive unit will hereby have a high impedance seen from the feed point of the antenna. In the retracted position, the part received in the housing will thus not affect the relatively short part that pro ⁇ trudes from the housing.
  • fig. 1 shows the principle of a preferred embodiment of an antenna construction according to the invention, the an- tenna being in the extended position,
  • fig. 2 shows the antenna construction of fig. 1, with the antenna element in the retracted position
  • fig. 3 shows an equivalent diagram of the antenna con ⁇ struction shown in fig. 1 as well as the adaptation of it,
  • fig. 4 shows an alternative embodiment of an antenna con ⁇ struction according to the invention
  • fig. 5 shows how the antenna construction of fig. 1 may be realized in practice
  • fig. 6 schematically shows how an alternative embodiment with a shortened antenna element may be realized.
  • figs. 1 and 2 show the principles of a preferred embodiment of the invention.
  • the antenna construction com ⁇ prising an antenna element 1 which is slidably moveable between two extreme positions.
  • One is shown in fig. 1, and the antenna element 1 is here extended from the housing of the portable telephone, so that the portable telephone can transmit with maximum power and receive with maximum sen ⁇ sitivity, the portable telephone being hereby capable of satisfying the requirements made by the authorities for MT system approval.
  • Fig. 2 shows how the antenna element
  • the antenna element 1 is retracted in the housing of the portable telephone (not shown in the figures) and is received in an electri ⁇ cally conducting tube 2, said tube 2 forming a coaxial transmission line together with the antenna element 1.
  • the antenna element 1 is electrically coupled to the transmit/receive parts (not shown) of the portable telephone through a coaxial cable 4, whose cen ⁇ tral conductor is connected to a pipe section 3, which is arranged coaxially with the antenna element 1 and coupled to the antenna element 1 through a capacitive coupling.
  • the tube section 3 is electrically insulated from the tube
  • the high frequency signal can hereby be coupled to the antenna element 1 without the use of physical contact arrangements.
  • the antenna element 1 is terminated by a coil 5.
  • the part . of the antenna element 1 protruding from the tube 2 is shorter than a quarter-wavelength in the passive mode of the portable telephone.
  • Such an antenna is capaci- tive and may e.g. be tuned by means of an extension coil arranged in the center or at the top of the antenna. The use of a top coil is most practical since it can be con ⁇ cealed and protected in an antenna knob, as will be ex ⁇ plained in connection with fig. 5.
  • the antenna When the antenna is fully extended, it has a length L. + L,r ⁇ , which may e.g. be 5/8 wavelength or 3/4 wavelength. With an overall antenna length of 5/8 wavelength the an ⁇ tenna will have a capacitive impedance and can therefore be tuned with a series coil. In the preferred embodiment an antenna element with an overall length of 3/4 wave- length is perferred, the antenna impedance being thereby substantially real, so that there is no need for a tuning link in the antenna construction. In the extended posi ⁇ tion, this antenna has current maximum at the feed point.
  • short and long antenna refers to the active part of the antenna when the portable telephone is in the passive mode and in the active mode, respectively.
  • the feed impedance of the short antenna part is low, and it is preferred that tuning is performed with the top coil, as mentioned before.
  • the long antenna is chosen to be precisely 1/2 wavelength longer than the short antenna and is tuned with the same top coil. Thus, there is no need for a tuning link in the feed point. Without use of insulation the long antenna will have an electrical length that corresponds to the physical length.
  • Fig. 3 shows an electrical equivalent diagram of the antenna construction according to the pre ⁇ ferred embodiment when the antenna element 1 is inserted into the tube 2 so that just the tip protrudes.
  • the short antenna is tuned with a top coil 5, whose physical embodiment is important since the coil does not serve as a simple impedance transformation link, but as part of the antenna radiator which has a longer electrical than physical length owing to the helixshape. Seen from the base point A of the antenna, the antenna has a low impedance, while the antenna part received by the tube with a length corresponding to 1/2 wavelength has a high impedance. As will be seen, there are no other tuning links in the antenna construction.
  • the antenna element When the antenna element is pushed into the apparatus, a portion of the length L ⁇ will be received in a thin and preferably cylindrical metal tube, to take up as little space as possible in the apparatus.
  • the antenna element may be selected according to the demands made on its func ⁇ tion, and will preferably be an unbroken metal wire with some flexibility. Since the inserted partulate of the metal wire is formed with an electrical length of 1/2 wavelength and forms, together with the tube 2, an open coaxial half- wave transmission line, the impedance seen from the base point will be high, so that the short antenna part of low impedance is not affected. For optimum utilization of this principle, the short antenna is fed in a current maximum.
  • the coaxial transmission line may be constructed as a short circuited quater-wave transmission line. This is realized by arranging a sliding contact 6 in the tube 2 at a distance form the feed point corresponding to a quarter-wavelength, which is shown in fig. 4.
  • the part inserted into the tube 2 will have a high impedance seen from the feed point and will therefore not affect the function of the short antenna.
  • This high impedance is in ⁇ dependent upon the antenna element part present below the sliding contact 6, so that the physical length of the in ⁇ serted part may be chosen freely.
  • the antenna element may e.g. be constructed as an elastic element whose end is connected to e.g. a motor, so that the antenna element may automatically be moved into and out of the housing of the portable telephone controlled by the user.
  • the antenna element part present in the tube 2 has the same electrical and physical length when the antenna ele- ment is not surrounded by a dielectric material. If the antenna element is surrounded by a dielectric the physical length will be equal to the electrical length multiplied by the square root of the effective dielectricity con ⁇ stant. This is given by the following expression:
  • r is the radius of the antenna element 1
  • r. is the radius of the dielectric surrounding the antenna element 1
  • e is the relative dielectricity constant of the dielec- r trie.
  • Fig. 5 shows a possible embodiment of an antenna construc ⁇ tion according to the invention, the antenna construction comprising an antenna element 1 which comprises a rod 28 of conductive material, which is coated with an insulation layer 29 that may e.g. be plastics.
  • a knob 30 is provided at the top of the antenna element, containing the pre ⁇ viously mentioned extension coil 31.
  • the antenna element 1 is extended almost completely from the housing of the portable telephone, the antenna element 1 being slidable through an opening in a wall 10 in said housing.
  • the an ⁇ tenna construction is connected to the transmit/receive unit in the portable telephone through a coaxial cable 20, whose outer conductor 21 is attached to a ring 25 which connects the outer conductor 21 through a connector 26 to _ ⁇ tube 27, which is adapted to receive the antenna element 1 as it is inserted into the housing of the portable tele ⁇ phone.
  • the inner conductor 23 of the coaxial cable 20, which is insulated from the outer conductor 21 through the insulation 22, is connected to the capacitive coupling tube, shown in fig. 1, through another connector 24, said capacitive coupling tube having e.g. the shape of the corresponding coupling tube 17 shown in fig. 5.
  • the coupling tube 17 serves to transfer electromagnetic energy to the antenna ' element 1, but is here also constructed so as to serve to control the move ⁇ ments of the antenna element 1 with repect to the tube 27.
  • the coupling tube 17 is therefore provided with shoulders engaging the internal side of the housing wall 10 through an insulation ring 14.
  • the part of the coupling tube 17 protruding from the housing serves as an attachment part and is therefore provided with external threads, by means of which the coupling tube 17 is fixed with respect to the housing by clamping of a nut 15.
  • the antenna element 1 is thus adapted to be slidably received in the coupling tube 17, where a sealing ring 16 ensures that water does not leak into the tube 27 upon displacement of the antenna element 1.
  • the internal part of the attachment part on the coupling tube 17 is constructed so that the antenna ele ⁇ ment 1 is allowed to move transversely to some degree.
  • the bottom of the antenna element 1 is provided with a stop 19 which, when the antenna element is extended to the ex- tended position, is caused to engage the end of the coup ⁇ ling tube 17. This prevents the antenna element 1 from being moved completely out of the housing of the portable telephone.
  • the antenna construction illustrated in fig. 5 has a total length of 3/4 wavelength, and thereby a total length of about 20 cm when used in connection with an NMT system.
  • the long antenna will have a length of 3/4 wavelength
  • the short antenna When the portable telephone is in the passive mode, the short antenna will be a quarter-wave antenna with top coil, while the inserted part of the an ⁇ tenna element will serve as a half-wave resonator in the tube 27. No tuning link is necessary for this antenna con ⁇ struction.
  • the length of the tube part 17 will typically be of the order of 25-50 mm.
  • the antenna con- struction shown in fig. 5 may be modified by arranging a sliding contact interiorly in the tube 27, said sliding contact being then positioned at a distance corresponding to 1/4 wavelength from the feed point of the antenna.
  • the long antenna will be provided with a length of 3/4 wavelength (including top coil), which corresponds to about 20 cm.
  • the short antenna will be a quarter-wave an ⁇ tenna with top coil, the antenna element part received in the tube 27 serving as a quarter-wave resonator.
  • the antenna element must be stripped at least over part of its longitudinal extent.
  • the thickness of the insulation material layer 29 was small with respect to the radius of the tube 27.
  • An in- crease in the insulation material layer for the antenna construction shown in fig. 5 provides the advantage that the physical length of the antenna element can be reduced while maintaining its electrical length.
  • the various radii may be adapted with respect to the effective dielec ⁇ tricity constant according to expression 2, and it is pos ⁇ sible to use an antenna element 1 with a physical length of e.g. 16 cm.
  • the long antenna will have a length of 5/8 wavelength, while the short antenna will still be a quarter-wave antenna with top coil, the antenna element part received in the tube 27 constituting a shortened half-wave resonator.
  • a tuning link will now be necessary between the central conductor 23 of the coaxial cable 20 and the connector 24. This link must be capable of being connected and disconnected from the path of the high frequency signals in response to the mode of the portable telephone.
  • Fig. 6 shows how such an antenna construction may be rea- lized. Only the most necessary parts to illustrate the principle are included in fig. 6.
  • the housing of the port ⁇ able telephone has a wall 110 with an opening in which a coupling tube 117 is mounted.
  • a permanent magnet 140 is arranged in elongation of the conducting part 128 of the antenna element. This magnet 140 does not contribute to the radiation function of the antenna, and is thus in- sulated from the conducting antenna element 128. As will be explained later, the magnet 140 contributes to connect ⁇ ing and disconnecting an antenna tuning link.
  • the antenna element is adapted to be received in an electrically con ⁇ ducting tube 127, which is connected to ground via the outer conductor 121 of a coaxial cable 120.
  • the coaxial cable 120 couples the high frequency signal to the antenna element 1 through the coupling tube 117, which is con ⁇ nected to the central conductor 123 of the coaxial cable 120 through the tuning link.
  • An antenna tuning link is provided between the coaxial cable 121 and the coupling tube 117, said antenna tuning link comprising an induc ⁇ tance Lsi. which is connected to the central conductor 123 of the coaxial cable 120 and which is also connected to ground through a second inductance L •__ggi___ and to the coupling tube 117 through a third inductance L 3 .
  • a Reed contact consisting of a contact part 142 and a permanent magnet
  • the two magnets 140 and 141 are of oppo ⁇ site polarity. It is hereby ensured that the contact 142 is made when the antenna is moved into the housing of the portable telephone, the magnet 140 being moved away from the contact. The magnet 141 will hereby dominate the Reed contact and ensure that it is made. When the antenna is extended again, the magnet 140 is positioned close to the magnet 141, the magnetic field, which affects the contact element 142, being thereby reduced because of the opposite polarity of the two magnets 140 and 141. The contact 142 is hereby broken.
  • the series inductance Lsi. is dimensioned so that the antenna element, which has a length of 5/8 wavelength, is tuned in extended position.

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

Abstract

Une structure d'antenne munie d'un élément d'antenne en forme de tige est conçue pour être utilisée dans les téléphones portatifs. L'élément d'antenne en forme de tige est conçu pour pouvoir se déplacer de manière glissante dans un tube entre une première position dans laquelle l'élément d'antenne tout entier fait saillie du tube et contribue au rayonnement, et une deuxième position dans laquelle seulement une partie de l'élément d'antenne fait saillie du tube et contribue au rayonnement. Ledit élément est conçu pour pouvoir se loger dans le tube afin de servir de ligne de transmission coaxiale. Cette ligne est conçue de manière que dans la deuxième position, dans laquelle une partie de l'élément est reçue dans le tube, elle présente une longueur et une manière de terminaison telles que l'impédance de la ligne de transmission est élevée, lorsqu'on la considère depuis la partie en saillie de l'élément d'antenne, et par conséquent n'affecte pas cette partie. La ligne de transmission coaxiale peut être par exemple une ligne de transmission demi-onde ouverte. Cependant, la ligne de transmission peut également être réalisée sous la forme d'une ligne de transmission quart-d'onde court-circuitée, ou d'une ligne de transmission demi-onde raccourcie ouverte.
PCT/DK1992/000086 1991-03-19 1992-03-18 Structure d'antenne munie d'un element d'antenne extensible WO1992016980A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE69201556T DE69201556T2 (de) 1991-03-19 1992-03-18 Antennenkonstruktion mit einem ausziehbaren antennenelement.
EP92907567A EP0576531B1 (fr) 1991-03-19 1992-03-18 Structure d'antenne munie d'un element d'antenne extensible
GR950400839T GR3015692T3 (en) 1991-03-19 1995-04-04 An antenna construction with an extensible antenna element.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK0491/91 1991-03-19
DK049191A DK168346B1 (da) 1991-03-19 1991-03-19 Antennekonstruktion med udtrækkeligt antenneelement

Publications (1)

Publication Number Publication Date
WO1992016980A1 true WO1992016980A1 (fr) 1992-10-01

Family

ID=8094162

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1992/000086 WO1992016980A1 (fr) 1991-03-19 1992-03-18 Structure d'antenne munie d'un element d'antenne extensible

Country Status (8)

Country Link
EP (1) EP0576531B1 (fr)
AT (1) ATE119318T1 (fr)
AU (1) AU1452992A (fr)
DE (1) DE69201556T2 (fr)
DK (1) DK168346B1 (fr)
ES (1) ES2071501T3 (fr)
GR (1) GR3015692T3 (fr)
WO (1) WO1992016980A1 (fr)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0590534A1 (fr) * 1992-09-28 1994-04-06 Ntt Mobile Communications Network Inc. Unité radio portable
EP0613206A1 (fr) * 1993-02-25 1994-08-31 Nec Corporation Antenne pour un radiotéléphone
EP0613207A1 (fr) * 1993-02-26 1994-08-31 Nec Corporation Antenne d'un radiotéléphone
US5353036A (en) * 1991-07-13 1994-10-04 Nokia Mobile Phones (U.K.) Limited Dual antenna assembly with antenna retraction inactivation
EP0650282A1 (fr) * 1993-09-23 1995-04-26 AT&T Corp. Mécanisme automatique pour des antennes téléscopiques
EP0688060A1 (fr) * 1994-06-13 1995-12-20 Galtronics Ltd. Agencement d'antenne et dispositif électrique comprenant une telle antenne
GB2296603A (en) * 1994-12-23 1996-07-03 Nokia Mobile Phones Ltd Retractable antenna
EP0747990A1 (fr) * 1995-06-06 1996-12-11 Nokia Mobile Phones Ltd. Antenne
DE19639642A1 (de) * 1995-09-29 1997-04-03 Motorola Inc Antennenvorrichtung für eine drahtlose Kommunikationsvorrichtung
EP0736925A3 (fr) * 1995-04-07 1997-11-05 Nokia Mobile Phones Ltd. Une antenne à double action et un téléphone mobile avec une telle antenne
GB2288073B (en) * 1993-09-20 1997-12-10 Motorola Inc Antenna arrangement for a wireless communication device
WO1998009342A1 (fr) * 1996-08-29 1998-03-05 Telefonaktiebolaget Lm Ericsson (Publ) Dispositif d'antenne et procede pour equipement radio portable
US5999133A (en) * 1997-03-24 1999-12-07 Telefonaktiebolaget Lm Ericsson Retractable antenna with shifting electrical length
US6008765A (en) * 1994-12-23 1999-12-28 Nokia Mobile Phones Limited Retractable top load antenna
WO2000011748A3 (fr) * 1998-08-19 2000-06-02 Allgon Ab Antenne comprenant des organes de connexion coulissants
JP3119553B2 (ja) 1993-02-25 2000-12-25 日本電気株式会社 無線機用アンテナ
US6738603B1 (en) 1999-06-10 2004-05-18 Nec Corporation Radio communication apparatus with retractable antenna and its impedance matching method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4725845A (en) * 1986-03-03 1988-02-16 Motorola, Inc. Retractable helical antenna
EP0323726A2 (fr) * 1987-12-25 1989-07-12 Nippon Antenna Co., Ltd. Antenne à large bande
US4860024A (en) * 1987-12-28 1989-08-22 Harada Kogyo Kabushiki Kaisha Antenna for a portable radiotelephone
US4890114A (en) * 1987-04-30 1989-12-26 Harada Kogyo Kabushiki Kaisha Antenna for a portable radiotelephone
EP0359361A1 (fr) * 1988-08-03 1990-03-21 Alliance Research Corporation Antenne à extension automatique pour le téléphone d'automobile

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4725845A (en) * 1986-03-03 1988-02-16 Motorola, Inc. Retractable helical antenna
US4890114A (en) * 1987-04-30 1989-12-26 Harada Kogyo Kabushiki Kaisha Antenna for a portable radiotelephone
EP0323726A2 (fr) * 1987-12-25 1989-07-12 Nippon Antenna Co., Ltd. Antenne à large bande
US4860024A (en) * 1987-12-28 1989-08-22 Harada Kogyo Kabushiki Kaisha Antenna for a portable radiotelephone
EP0359361A1 (fr) * 1988-08-03 1990-03-21 Alliance Research Corporation Antenne à extension automatique pour le téléphone d'automobile

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 9, No. 244, E346; & JP,A,60 094 507 publ 1985-05-27 FUJITSU TEN K.K. *

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5353036A (en) * 1991-07-13 1994-10-04 Nokia Mobile Phones (U.K.) Limited Dual antenna assembly with antenna retraction inactivation
EP0590534A1 (fr) * 1992-09-28 1994-04-06 Ntt Mobile Communications Network Inc. Unité radio portable
US5412392A (en) * 1992-09-28 1995-05-02 Ntt Mobile Communications Network, Inc. Portable radio unit having strip antenna with parallel twin-lead feeder
EP0613206A1 (fr) * 1993-02-25 1994-08-31 Nec Corporation Antenne pour un radiotéléphone
US5467096A (en) * 1993-02-25 1995-11-14 Nec Corporation Antenna for a radio communication apparatus
AU673037B2 (en) * 1993-02-25 1996-10-24 Anten Corporation Antenna for a radio communication apparatus
JP3119553B2 (ja) 1993-02-25 2000-12-25 日本電気株式会社 無線機用アンテナ
EP0613207A1 (fr) * 1993-02-26 1994-08-31 Nec Corporation Antenne d'un radiotéléphone
US5438339A (en) * 1993-02-26 1995-08-01 Nec Corporation Antenna for a radio communication apparatus
ES2112200A1 (es) * 1993-09-20 1998-03-16 Motorola Inc Dispositivo de antena para un aparato inalambrico de comunicacion.
GB2288073B (en) * 1993-09-20 1997-12-10 Motorola Inc Antenna arrangement for a wireless communication device
EP0650282A1 (fr) * 1993-09-23 1995-04-26 AT&T Corp. Mécanisme automatique pour des antennes téléscopiques
EP0688060A1 (fr) * 1994-06-13 1995-12-20 Galtronics Ltd. Agencement d'antenne et dispositif électrique comprenant une telle antenne
US5606327A (en) * 1994-06-13 1997-02-25 Elliott; Michael Electrical antenna assembly and electrical device including same
GB2296603A (en) * 1994-12-23 1996-07-03 Nokia Mobile Phones Ltd Retractable antenna
US6008765A (en) * 1994-12-23 1999-12-28 Nokia Mobile Phones Limited Retractable top load antenna
GB2296603B (en) * 1994-12-23 1999-02-17 Nokia Mobile Phones Ltd Retractable top load antenna
EP0736925A3 (fr) * 1995-04-07 1997-11-05 Nokia Mobile Phones Ltd. Une antenne à double action et un téléphone mobile avec une telle antenne
US6054966A (en) * 1995-06-06 2000-04-25 Nokia Mobile Phones Limited Antenna operating in two frequency ranges
EP0747990A1 (fr) * 1995-06-06 1996-12-11 Nokia Mobile Phones Ltd. Antenne
DE19639642A1 (de) * 1995-09-29 1997-04-03 Motorola Inc Antennenvorrichtung für eine drahtlose Kommunikationsvorrichtung
US5812093A (en) * 1995-09-29 1998-09-22 Motorola, Inc. Antenna assembly for a wireless-communication device
ES2154611A1 (es) * 1996-08-29 2001-04-01 Ericsson Telefon Ab L M Dispositivo y metodo de antena para equipos de radio portatil.
US6016125A (en) * 1996-08-29 2000-01-18 Telefonaktiebolaget Lm Ericsson Antenna device and method for portable radio equipment
WO1998009342A1 (fr) * 1996-08-29 1998-03-05 Telefonaktiebolaget Lm Ericsson (Publ) Dispositif d'antenne et procede pour equipement radio portable
GB2333903B (en) * 1996-08-29 2000-12-13 Ericsson Telefon Ab L M Antenna device and method for portable radio equipment
GB2333903A (en) * 1996-08-29 1999-08-04 Ericsson Telefon Ab L M Antenna device and method for portable radio equipment
US5999133A (en) * 1997-03-24 1999-12-07 Telefonaktiebolaget Lm Ericsson Retractable antenna with shifting electrical length
WO2000011748A3 (fr) * 1998-08-19 2000-06-02 Allgon Ab Antenne comprenant des organes de connexion coulissants
GB2357637A (en) * 1998-08-19 2001-06-27 Allgon Ab Antenna device comprising sliding connector means
US6392604B1 (en) * 1998-08-19 2002-05-21 Allgon Ab Antenna device comprising sliding connector means
GB2357637B (en) * 1998-08-19 2003-07-16 Allgon Ab Antenna device comprising sliding connector means
US6738603B1 (en) 1999-06-10 2004-05-18 Nec Corporation Radio communication apparatus with retractable antenna and its impedance matching method

Also Published As

Publication number Publication date
EP0576531B1 (fr) 1995-03-01
ES2071501T3 (es) 1995-06-16
AU1452992A (en) 1992-10-21
DK49191A (da) 1992-09-20
GR3015692T3 (en) 1995-07-31
ATE119318T1 (de) 1995-03-15
DE69201556D1 (de) 1995-04-06
DE69201556T2 (de) 1995-06-29
EP0576531A1 (fr) 1994-01-05
DK168346B1 (da) 1994-03-14
DK49191D0 (da) 1991-03-19

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