EP1435125B1 - Antenne helicoidale - Google Patents

Antenne helicoidale Download PDF

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Publication number
EP1435125B1
EP1435125B1 EP02748837A EP02748837A EP1435125B1 EP 1435125 B1 EP1435125 B1 EP 1435125B1 EP 02748837 A EP02748837 A EP 02748837A EP 02748837 A EP02748837 A EP 02748837A EP 1435125 B1 EP1435125 B1 EP 1435125B1
Authority
EP
European Patent Office
Prior art keywords
antenna
coil
portions
hollow cylinder
bandwidth
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.)
Expired - Lifetime
Application number
EP02748837A
Other languages
German (de)
English (en)
Other versions
EP1435125A1 (fr
Inventor
Ovadia Grossman
Moshe Ben-Ayun
Mark Rozental
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.)
Motorola Solutions UK Ltd
Motorola Solutions Inc
Original Assignee
Motorola Ltd
Motorola Inc
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 Motorola Ltd, Motorola Inc filed Critical Motorola Ltd
Publication of EP1435125A1 publication Critical patent/EP1435125A1/fr
Application granted granted Critical
Publication of EP1435125B1 publication Critical patent/EP1435125B1/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
    • H01Q11/00—Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
    • H01Q11/02—Non-resonant antennas, e.g. travelling-wave antenna
    • H01Q11/08—Helical antennas
    • 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
    • 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
    • H01Q9/36—Vertical arrangement of element with top loading

Definitions

  • the present invention relates to an antenna for use in radio communications particularly for use in a mobile radio communications unit.
  • Mobile communications are carried out using mobile radio communications units known in the art as 'mobile stations' which include a transmitter to convert messages or information of a user input mainly in the form of speech, but possibly also in the form of text data or visual images etc., into radio frequency (RF) signals for transmission to a distant receiver, and a receiver to convert received RF signals from a distant transmitter back into information which can be understood by the user.
  • RF radio frequency
  • Many components of the transmitter and receiver are common components usually forming a single transceiver unit.
  • an antenna In a mobile station, the function of sending and receiving an RF signal via an air interface to and from a distant transceiver is carried out by a component referred to in the art as an antenna or aerial.
  • an antenna is a device which converts an electrical signal oscillating at RF frequency into a radiated electromagnetic energy signal and vice versa.
  • the RF signals In modern mobile communications, such as using digital technology, the RF signals generally have a high frequency, e.g. above 30MHz. For example, for systems operating according to TETRA standard procedures, a specified operating frequency is in the range from 410MHz to 430MHz, centre frequency 420MHz.
  • TETRA Transrestrial Trunked Radio
  • ETSI European Telecommunications Standards Institute
  • An antenna needs to be designed so that it can transmit and receive accurately and with a strong signal in the designated frequency band. Unfortunately, this is made difficult by factors encountered during manufacture and use of a mobile station for use in modern systems as follows.
  • an allowance of about +/-1% TO 2% of the centre frequency to which the antenna is tuned has to be provided as a manufacturing tolerance for the antenna .
  • the variation is +/- 3MHz.
  • RL is defined as the ratio of (i) the RF power returned by the antenna to the transmitter to (ii) the incident power from the transmitter. The more power returned the poorer is the tuning and the performance of the antenna. This loss can become greater as the frequency departs from an optimum operating frequency which usually coincides with the centre frequency to which the antenna is tuned, or the centre frequency of the designated frequency band. In general, maintaining an acceptable RL over a reasonable band of frequencies is difficult. For example, for a TETRA mobile station, if the maximum RL allowed is -10dB , then the typical bandwidth achieved for this specification for an antenna operating in free space is 15MHz to 20MHz. For an RL of 5db, the typical bandwidth is 30 MHz.
  • an antenna and its associated transceiver circuits can be detuned by being in close proximity a detuning body such as a user.
  • detuning body such as a user.
  • detuning can be as much as 25MHz from the centre frequency by being next to the head of the user.
  • antennae used in mobile stations because of user preference is a short length.
  • the maximum length desired for short antennae is 100mm, preferably not greater than, desirably less than, 50mm.
  • the maximum length desired for short antennae is 100mm, preferably not greater than, desirably less than, 50mm.
  • this is equivalent to a typical maximum length of 0.014 ⁇ , preferably a maximum length of about 0.07 ⁇ , where ⁇ is the wavelength at centre frequency.
  • reducing the length causes a reduction in efficiency and bandwidth of the antenna.
  • antennae which are small, e.g. not greater than 100mm in length, and for operation at high frequencies, e.g. greater than 30MHz have been in the simple form of an inductive coil above ground plane connected directly to the RF feed line. Such an antenna is used for example in the currently available Motorola d1700 radio for use in mobile communications.
  • an antenna is required having a short length and operating at high frequency and having a higher than usual bandwidth, e.g. higher than obtained with currently available antennae for such uses.
  • the purpose of the present invention is to provide a novel antenna for this requirement.
  • GB-A-2282487 and US-A-5216436 are mentioned as giving examples of prior art configurations. These configurations include a 'top hat' portion which is required to occupy a considerable volume.
  • WO-A-98/48474 discloses an antenna according to the preamble of claim 1.
  • an antenna for use in a radio communication device having a length of not greater than 100mm and including a first portion comprising a conductive helical or spiral coil extending along an axis and located between and electically connected to two further portions, namely a second portion for connection to a conductor of the radio device and comprising a conductive linear stub portion and a third portion which comprises a conductive capacitive portion, wherein the portions mutually are arranged to provide at an operating frequency of the radio device an electrically resonating structure, wherein the third portion comprises a hollow cylinder extending along the axis of the coil, wherein the hollow cylinder comprises a curved plate, the curved plate having a gap between its lateral edges.
  • the said three portions of the novel antenna may have a common axis.
  • the first portion of the novel antenna may comprise a helical or spiral coil having an axis which is co-incident with a common axis of the antenna.
  • the first portion may have a substantial length along its axis, e.g at least 0.2L where L is the overall length of the antenna.
  • the first portion may comprise coiled conducting wire.
  • the second portion of the novel antenna may include as the stub portion an elongate conducting cylindrical portion extending along a common axis of the antenna.
  • the cylindrical portion may be a portion having an enlarged cross sectional area compared with narrower portions at the respective ends of the first portion.
  • the cylindrical portion may comprise a right circular cylinder of enlarged diameter.
  • the diameter may for example be at least 0.2L, preferably between 0.1L and 0.3L, where L is the length of the antenna.
  • the enlarged cylindrical portion and the coil of the first portion may have outside diameters which differ by not more than 0.7D, preferably by not more than 0.5D, where D is the outside diameter of the coil.
  • the enlarged cylindrical portion of the second portion has a lengthwhich is not greater than 0.6L.
  • the enlarged cylindrical portion may include at its ends narrower conducting protrusions.
  • the protrusions may be linear wire portions.
  • the cylindrical portion of the second portion may have a screw thread for attachment in a conventional manner to a complementary thread provided in a receptacle in the mobile station.
  • the coil of the first portion may be electrically connected to the second portion at an end of the cylindrical portion, e.g. at a protrusion provided at an end of the cylindrical portion.
  • the hollow cylinder may comprise a right circular cylinder.
  • the cylinder provides a curved plate having a gap between its lateral edges that may run parallel to a common axis of the antenna.
  • the arc formed in cross section by the curved plate may extend for an angle of at least 270 degrees, e.g. 300 degrees or more, desirably at least 320 degrees.
  • the third portion and the coil of the first portion may have outside diameters which differ by not more than 0.5D, preferably by not more than 0.2D, where D is the outside diameter of the coil.
  • the coil of the first portion may be elcetrically connected to the third portion at an end of the third portion, e.g. at an end of a hollow cylinder or curved plate thereof.
  • the third portion may be considered as as another (wider) turn of the coil of the first portion, and preferably is connected to the coil in a manner such that the third portion and the first portion have a common axis and a similar outer envelope whereby the third portion acts as as a continuation of the coil.
  • the novel antenna desirably has an effective electrical length of not greater than 0.1 ⁇ , e.g. between 0.05 ⁇ and 0.1 ⁇ , preferably between 0.05 ⁇ and 0.075 ⁇ , where ⁇ is the mean wavelength of electromagnetic radiation to be transmitted or received by the antenna in operation.
  • the effective electrical length of the first portion is desirably from 0.025 ⁇ to 0.035 ⁇ , preferably at least 0.03 ⁇ .
  • the effective electrical length of the second portion is desirably from 0.025 ⁇ to 0.035 ⁇ , preferably at least 0.03 ⁇ .
  • the length of the third portion is desirably from 0.01 ⁇ to 0.03 ⁇ , preferably from 0.015 ⁇ to 0.025 ⁇ .
  • the length of the novel antenna is desirably not greater than 70mm, in many cases about 50mm or less.
  • the novel antenna is desirably such that the arrangement of the portions gives an improved loaded and unloaded resonance Q factor, e.g. in operation a loaded resonance Q factor of the antenna of 6 or less, preferably 4 or less.
  • the novel antenna has in operation a bandwidth which is at least 12%, preferably at least 15% or or higher, that of the RF centre frequency radiated or received by the antenna.
  • the bandwidth is desirably at least 50MHz.
  • 'bandwidth' is here defined as the desired range of operating frequencies of the antenna within which the magnitude of the return loss of the antenna is not more than - 5dB. This means that the antenna gain variation within the band is below 1.6db.
  • the novel antenna provides for a short antenna length of not greater than 100mm a significantly improved bandwidth compared with the prior art.
  • the average gain (reduction in loss) of the antenna at operating frequencies is also unexpectedly improved.
  • the novel antenna is suitable for use in a radio transmitter or receiver or transceiver for mobile communications.
  • there is no restriction on the operational frequency of the communications possible using the antenna but most beneficial use of the antenna is likely to be found in the operational frequency range 30MHz to 1GHz.
  • the antenna according to the invention is different from the configurations of the prior art.
  • the third portion included in the antenna according to the invention is different from the 'top hat' features of the prior art.
  • the novel form of the antenna according to the invention beneficially contributes to an improved low profile (i.e. avoids occupation of a large antenna space), and improved bandwidth and efficiency, the latter being provided by a more uniform current distribution.
  • the form of the second portion and the overall novel configuration also contribute to improved efficiency in the antenna according to the invention.
  • Figure 1 is a front elevation partly in schematic form of an antenna embodying the invention.
  • an antenna 1 embodying the invention for use in a mobile station has a longitudinally extending axis 2 and comprises a first conducting portion 3, a second conducting portion 5 and a third conducting portion 7.
  • the first, second and third portions may be made of a copper based material or other efficiently conducting material well known and used in the art.
  • the first portion 5 and the third portion 7 are enclosed in a conventional manner in an insulating case 9, e.g. made of a moulded plastics material.
  • the case 9 is conventional and provides mechanical and environmental protection of the antenna 1.
  • the first portion 3 has a length of about 0.38L
  • the second portion has a length of about 0.36L
  • the third portion has a length of about 0.26L where L is the overall length of the conducting parts of the antenna 1.
  • the overall length of the conducting parts is about 0.07 ⁇ , i.e. about 50mm.
  • the first portion 3 comprises a coil extending along the axis 2 of the antenna 1.
  • the second portion 5 comprises a right cylindrical conducting body of enlarged diameter 5b having at its ends protruding wires 5a and 5c, the wire 5c extending into the case 9.
  • the wire 5a is in use connected to feeder transmission line conductor (not shown) via a feeder structure (usually a form of spring - not shown) of a mobile station.
  • the cylindrical body 5b of the second portion 5 may have a screw thread (not shown) for attachment in a conventional manner to a complementary thread (not shown) provided in the mobile station.
  • the first portion 3 is connected to the second portion 5 at the wire 5c.
  • the third portion 7 comprises a curved plate of conducting material extending along the axis 2.
  • the first portion 3 is electrically connected to the third portion 7 at an end of the curved plate thereof.
  • the first portion 3 and the second portion 7 have approximately equal outside diameters.
  • the curved plate forms in cross section in a plane perpendicular to the axis 2 an extended arc of greater than 270 degrees, e.g. greater than 300 degrees.
  • the curved plate has longitudinally extending edges 7a and 7b facing one another and a gap 7c extending between the edges 7a and 7b.
  • the third portion 7 functions as a capacitive portion.
  • the purpose of the second portion 5 is as follows.
  • the second portion 5 provides a connection between the conductive feed line above ground plane (not shown) of the mobile station and the coil of the first portion 3 whereby the first portion 3 is elevated from the ground plane.
  • the portion 5 allows the antenna to have a better and more uniform current distribution on the antenna and its counterpoise (the ground plane) giving an improvement in efficiency or gain of the antenna.
  • the second portion 5 also allows the bandwidth of the antenna to be increased by providing a smaller than usual capacitance to ground.
  • the purpose of the third portion 7 is to provide a so called 'top loading' which mainly allows a reduction in the antenna length to be achieved without a significant change in operating frequency.
  • An antenna top loading is known per se, e.g. as from US4857939 or WO-A-98/48474.
  • the curved plate of the third portion 7 replaces but performs a similar function to additional winding(s) of the coil of the first portion (in the same direction).
  • the length of the curved plate is chosen to achieve the highest bandwidth for the antenna 1 given the length limit and the limitations for simplicity of production on its mechanical configuration.
  • the gap 7c beneficially increases the capacitance to ground and the inductance of the third portion 7.
  • the coil windings at the top (end distant from the ground plane) of a conventional short, high frequency antenna are very inefficient in their inductance creating function in view of the very low current at the top.
  • Replacing one or more windings at the top of the antenna by a capacitive portion, namely the third portion 7, in the antenna embodying the invention shown in Figure 1 allows one or more low current windings to be replaced and the antenna length to be reduced without substantially changing the centre frequency.
  • the configuration of the portion 7 shown in Figure 1 provides a field distribution within the case 9 which is different from that from a simple coil and this gives an improvement in antenna losses experienced in the plastics case compared with those obtained with antennae of the prior art.
  • the antenna 1 provides a resonant LCR (inductor/capacitor/resistor) circuit which together with a tuning circuit, which may be a conventional circuit, in the mobile station (not shown) may be tuned to operate at the required centre frequency of operation of the mobile station.
  • LCR inductive component/capacitor/resistor
  • the inductive component L of the antenna resonant circuit is provided mainly by the coil of the first portion 3, the capacitive component is provided mainly by the third portion 7 and the resistive component is provided by all three portions.
  • the antenna 1 is connected to transceiver circuitry of a mobile station (not shown) usually in the form of one or more printed circuits and/or a metal chassis providing the ground plane described earlier, usually via a feed structure.
  • the transceiver circuit as in conventional circuits may include a circuit for fine tuning of the transmitted and received RF signals as mentioned earlier.
  • An example of an antenna 1 shown in Figure 1 was produced for use in a TETRA mobile station.
  • the antenna had dimensions of 19mm, 18mm and 13mm respectively for the first portion 3, the second portion 5 and the third portion 7. Measurements were carried out as follows to determine the comparative benefits of this antenna referred to below as the 'subject antenna' compared with a reference antenna (a commercially available antenna for the same use at 420MHz consisting essentially of a coil of length 40mm connected directly to feed line.
  • 3dB Return Loss (RL) bandwidth is the bandwidth for the antenna operating in air over which the RL is not greater than 3dB.
  • the in-hand bandwidth is the bandwidth of the antenna operating in the hand of a user for which the RL is not greater than 3dB.
  • Table 1 shows that superior bandwidth results and a superior peak RL, giving superior efficiency, were obtained with the subject antenna compared with the reference antenna. Further tuning of the novel antenna by use of a tuning circuit in the mobile station further increased the antenna bandwidth by an additional amount, typically about a further 50% above the figures given in Table 1.
  • the results obtained show that the subject antenna gives an improved RL loss, in other words an improved efficiency, and a significantly improved loaded Q factor and bandwidth at the relevant frequency, i.e. 420MHz, compared with the reference antenna.

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  • Support Of Aerials (AREA)
  • Details Of Aerials (AREA)
  • Transceivers (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Claims (17)

  1. , Antenne (1) à utiliser dans un dispositif de communication radio, l'antenne présentant une longueur n'étant pas supérieure à 100 mm et incluant une première partie (3) comprenant une bobine conductrice hélicoïdale ou spirale se déployant le long d'un axe (2) et située entre et connectée électriquement à deux parties supplémentaires, à savoir une deuxième partie (5) pour connexion à un conducteur du dispositif radio et comprenant une partie d'embase llnéaire conductrice et une troisième partie (7) qui comprend une partie capacitive conductrice, dans laquelle les parties sont mutuellement agencées pour délivrer à une fréquence de fonctionnement du dispositif radio une structure de résonance électrique, dans laquelle la troisième partie (7) comprend un cylindre creux se déployant le long de l'axe de la bobine, caractérisée en ce que le cylindre creux comprend une plaque incurvée, et en ce que la plaque incurvée présente un jeu (7c) entre ses rebords latéraux (7a, 7b).
  2. Antenne (1) selon la revendication 1 et dans laquelle les première, deuxième et troisième parties (3, 5, 7) de l'antenne (1) possèdent un axe commun (2).
  3. Antenne (1) selon la revendication 2 et dans laquelle la première partie (3) comprend une partie de bobine hélicoïdale possédant une enveloppe sensiblement cylindrique.
  4. Antenne (1) selon la revendication 2 ou la revendication 3 et dans laquelle la deuxième partie (5) comprend une partie cylindrique allongée se déployant le long de l'axe commun (2) de l'antenne.
  5. Antenne (1) selon l'une quelconque des revendications précédentes et dans laquelle le cylindre creux formant la troisième partie (7) comprend un cylindre creux possédant une extrémité libre non reliée à une quelconque autre partie au niveau de son extrémité distante des première et deuxième parties (3, 5).
  6. Antenne (1) selon l'une quelconque des revendications précédentes et dans laquelle la bobine est reliée à une extrémité du cylindre creux formant la troisième partie (7).
  7. Antenne (1) selon l'une quelconque des revendications précédentes et dans laquelle le jeu (7c) entre les rebords latéraux (7a, 7b) de la plaque incurvée s'étend en parillèle à l'axe de la bobine.
  8. Antenne (1) selon l'une quelconque des revendications précédentes et dans laquelle la deuxième partie (5) comprend une partie élargie (5b) comprenant un corps conducteur cylindrique droit possédant à ses extrémités des conducteurs faisant saille (5a, 5c) présentant un diamètre plus petit que celui de la partie élargie (5b).
  9. Antenne (1) selon l'une quelconque des revendications précédentes et comprenant un boîtier isolant (9) enveloppant les première et troisième parties (3, 7).
  10. Antenne (1) selon la revendication 9 et dans laquelle la deuxième partie comprend une partie élargie (5b) comprenant un corps conducteur cylindrique droit possédant à ses extrémités des conducteurs faisant saillie (5a, 5c) présentant un diamètre inférieur à celui de la partie élargie (5b) et dans laquelle l'un des conducteurs faisant saillie (5c) se déploie dans la zone à l'intérieur du boîtier (9) où il est connecté à la bobine de la première partie (3).
  11. Antenne (1) selon l'une quelconque des revendications précédentes et dans laquelle l'antenne (1) possède une longueur électrique efficace n'étant pas supérieure à 0,1 λ, où λ est la longueur d'onde moyenne du rayonnement électromagnétique devant être transmis ou reçu par l'antenne (1) en fonctionnement.
  12. Antenne (1) selon la revendication 11 et dans laquelle la longueur électrique efficace de la première partie (3) est de 0,025 λ à 0,035 λ.
  13. Antenne (1) selon la revendication 11 ou la revendication 12 et dans laquelle la longueur électrique efficace de la deuxième partie (5) est de 0,025 λ à 0,035 λ.
  14. Antenne (1) selon la revendication 11, la revendication 12 ou la revendication 13 et dans laquelle la longueur électrique efficace de la troisième partie (7) est de 0,015 λ à 0,025 λ.
  15. Antenne (1) selon l'une quelconque des revendications précédentes et dans laquelle l'agencement des parties est tel qu'en fonctionnement, le facteur Q de résonance chargée de l'antenne (1) est de 6 ou moins.
  16. Antenne (1) selon la revendication 15 et dans laquelle l'agencement des parties est tel qu'en fonctionnement, le facteur Q de résonance chargée de l'antenne (1) est de 4 ou moins.
  17. Antenne (1) selon l'une quelconque des revendications précédentes et dans laquelle l'antenne (1) présente en fonctionnement une bande passante qui est au moins de 12 pour cent celle de la fréquence centrale rayonnée ou reçue par l'antenne (1), dans laquelle la bande passante est définie comme la plage souhaitée des fréquences de fonctionnement de l'antenne à l'intérieur de laquelle la magnitude de l'affaiblissement de réflexion est inférieure à 5 dB.
EP02748837A 2001-09-29 2002-07-01 Antenne helicoidale Expired - Lifetime EP1435125B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB0123502A GB2380323B (en) 2001-09-29 2001-09-29 Antenna for use in radio communications
GB0123502 2001-09-29
PCT/EP2002/007277 WO2003030302A1 (fr) 2001-09-29 2002-07-01 Antenne helicoidale

Publications (2)

Publication Number Publication Date
EP1435125A1 EP1435125A1 (fr) 2004-07-07
EP1435125B1 true EP1435125B1 (fr) 2006-04-26

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EP02748837A Expired - Lifetime EP1435125B1 (fr) 2001-09-29 2002-07-01 Antenne helicoidale

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EP (1) EP1435125B1 (fr)
AT (1) ATE324681T1 (fr)
DE (1) DE60211003T2 (fr)
ES (1) ES2260461T3 (fr)
GB (1) GB2380323B (fr)
WO (1) WO2003030302A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI363756B (en) * 2004-12-07 2012-05-11 Du Pont Method for preparing n-phenylpyrazole-1-carboxamides
JP4869387B2 (ja) * 2009-07-06 2012-02-08 日本アンテナ株式会社 ホイップアンテナ
WO2012016144A2 (fr) 2010-07-30 2012-02-02 MP Antenna, Ltd. Ensemble antenne présentant un conditionnement de taille réduite
WO2017200371A1 (fr) * 2016-05-16 2017-11-23 Motorola Solutions, Inc. Antenne double contre-enroulée pour un dispositif de communication
USD936252S1 (en) 2018-10-17 2021-11-16 Hamamatsu Photonics K.K. Auxiliary electrode portion for a flash lamp

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5216436A (en) * 1991-05-31 1993-06-01 Harris Corporation Collapsible, low visibility, broadband tapered helix monopole antenna
SE468917B (sv) * 1991-08-16 1993-04-05 Ericsson Ge Mobile Communicat Miniatyrantenn
US5708445A (en) * 1993-01-29 1998-01-13 Motorola, Inc. Antenna assembly for radio circuit and method therefor
FR2711277B1 (fr) * 1993-10-14 1995-11-10 Alcatel Mobile Comm France Antenne du type pour dispositif radio portable, procédé de fabrication d'une telle antenne et dispositif radio portable comportant une telle antenne.
SE9701505L (sv) * 1997-04-21 1998-10-22 Lars Wendel Anordning vid en antenn
JP3792884B2 (ja) * 1997-11-27 2006-07-05 株式会社ヨコオ アンテナ
EP1151496A4 (fr) * 1999-02-04 2005-01-12 Maxrad Inc Antenne large bande compacte

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GB2380323A (en) 2003-04-02
ES2260461T3 (es) 2006-11-01
DE60211003D1 (de) 2006-06-01
DE60211003T2 (de) 2006-09-28
GB0123502D0 (en) 2001-11-21
WO2003030302A1 (fr) 2003-04-10
ATE324681T1 (de) 2006-05-15
GB2380323B (en) 2003-11-05
EP1435125A1 (fr) 2004-07-07

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