EP0649181A1 - Antenne für tragbares Funkgerät, Verfahren zur Herstellung einer derartigen Antenne und tragbares Funkgerät mit einer derartigen Antenne - Google Patents

Antenne für tragbares Funkgerät, Verfahren zur Herstellung einer derartigen Antenne und tragbares Funkgerät mit einer derartigen Antenne Download PDF

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Publication number
EP0649181A1
EP0649181A1 EP94402293A EP94402293A EP0649181A1 EP 0649181 A1 EP0649181 A1 EP 0649181A1 EP 94402293 A EP94402293 A EP 94402293A EP 94402293 A EP94402293 A EP 94402293A EP 0649181 A1 EP0649181 A1 EP 0649181A1
Authority
EP
European Patent Office
Prior art keywords
antenna
strand
propeller
antenna according
helical antenna
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
EP94402293A
Other languages
English (en)
French (fr)
Other versions
EP0649181B1 (de
Inventor
Jose Baro
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.)
Alcatel Lucent SAS
Original Assignee
Alcatel Mobile Communication France SA
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 Alcatel Mobile Communication France SA filed Critical Alcatel Mobile Communication France SA
Publication of EP0649181A1 publication Critical patent/EP0649181A1/de
Application granted granted Critical
Publication of EP0649181B1 publication Critical patent/EP0649181B1/de
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
    • 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
    • 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 present invention relates to an antenna of the type for portable radio device, and in particular for radiotelephone, as well as to a method of manufacturing such an antenna and to a portable radio device comprising such an antenna.
  • This antenna is intended to transmit and receive radio signals.
  • Such antennas are described for example in patent application EP-0 367 609 and in patent US-4 121 218.
  • the extractable strands currently known are generally substantially cylindrical, so that they occupy too large a volume in the radiotelephone housing.
  • An object of the present invention is therefore to provide an antenna for a portable radio device whose efficiency is increased compared to antennas of this type currently known.
  • Another object of the present invention is to produce an antenna of the previous type which occupies a volume inside the portable device which is as small as possible.
  • Another object of the present invention is to provide an antenna of the above type in which the extractable strand is as independent as possible from the housing of the associated radio device.
  • the present invention provides for this purpose an antenna of the type for portable radio device, comprising in particular a helical antenna coupled by its base to a transmitter receiver, characterized in that the pitch of the helix made of a conductive material constituting said helical antenna is variable according to the height of the helix, and decreasing from the base of said helical antenna to its top.
  • the antenna 1 comprises a helical antenna 2 and an extractable strand 3.
  • the helical antenna 2 is housed partly in a recess 4 in a radiotelephone housing 5, partially shown in FIG. 1.
  • the housing 5 is made of an insulating material, possibly metallized, and has a substantially parallelepiped shape.
  • an antenna housing 6 shown in broken lines whose base completes the recess 4 is used.
  • the helical antenna 2 is fully inserted in the antenna housing 6, and exceeds about three-quarters of its height beyond the housing 5 of the radiotelephone.
  • the pitch of the propeller 8 is variable and decreases from its base 8B to its apex 8A.
  • the width of the electrical track constituting the propeller 8 is also variable and decreases from the base 8B to the top 8A.
  • the electrical length of the propeller 8 is substantially equal to half the average wavelength of use.
  • the base 8B of the propeller 8, located at the base of the mandrel 7, is connected via an interconnection tab 9 to a coaxial cable 10 supplying the helical antenna 2 located in the radiotelephone case 5 and also connected to the latter's transmitter / receiver (not shown).
  • a positioning ring 11 (shown in broken lines) made of an insulating material, intended to center and maintain the helical antenna 2.
  • the extractable strand 3 consists of a metal ribbon 12 of very flat C-shaped cross section (see FIGS. 2 and 9), which will be described as flat.
  • the electrical length of the strip 12 is substantially equal to half the average wavelength of use.
  • the tape 12 is also inserted into a covering 13 made of an insulating material intended to protect it.
  • the extractable strand 3 further comprises a metal element 15 at its apex 3A, this element 15 extending in a direction substantially orthogonal to the axis X of the helix 8 (the ribbon 12 extends along a direction substantially parallel to the X axis).
  • the element 15 is also inserted into the covering 13, and it may or may not be electrically connected to the tape 12. Its usefulness will be explained below.
  • the extractable strand 3 can operate in two positions. In a first position (corresponding to that illustrated in FIG. 1), it is almost entirely retracted into the antenna housing 6 and into a suitable housing 14 formed in the housing 5 of the radiotelephone. In this position, the antenna 1 is of the quarter wave type (that is to say that it uses the box 5 as an electrical counterweight), and only the helical antenna 2 is then used for transmission and reception of radio signals. The walls of the housing 14 are covered with metal 141 to form a shield for the extractable strand 3 in the retracted position.
  • the extractable strand 3 In a second position (not shown), the extractable strand 3 is fully deployed outside the antenna housing 6. In this case, there is a capacitive coupling between the strand 3 and the top of the helical antenna 2, so that the total height of the antenna 1 and its radiation resistance are increased. In this position of the extractable strand 3, the antenna 1 is still of the quarter-wave type.
  • the lower end 13B of the covering 13 is of frustoconical shape with its base of larger diameter oriented towards the top of the antenna.
  • the end 13B abuts against the upper wall 14A of the housing 14.
  • an essential characteristic of the present invention resides in the fact that a helical antenna is used, the helix of which has a variable pitch, this pitch decreasing when one approaches the top of the helical antenna, that is to say as the theoretical current in a conventional helical antenna (that is to say with constant pitch and width) of the same dimensions decreases.
  • a helical antenna is used, the helix of which has a variable pitch, this pitch decreasing when one approaches the top of the helical antenna, that is to say as the theoretical current in a conventional helical antenna (that is to say with constant pitch and width) of the same dimensions decreases.
  • this structure makes it possible to establish in the helical antenna 2 a substantially trapezoidal distribution of the current. This increases the radiation resistance of the antenna, and therefore its efficiency and its bandwidth.
  • the turns of the propeller 8 are in contact with each other at the top 8A, so that a continuous metallized surface is obtained at the top 8A.
  • the apex 8A is made capacitive, which makes it possible to obtain the substantially trapezoidal distribution of the current and the advantages which result therefrom.
  • the turns of the propeller 8 constitute a tight spiral without however being in contact with each other. The capacity produced is thus made self-indent, which increases its apparent value.
  • the fact of carrying out a capacitance at the top of the helical antenna 2 facilitates and improves the capacitive coupling and the adaptation between the latter and the extractable strand 3.
  • variable pitch propeller makes it possible to obtain optimal conditions for adaptation and coupling in the two operating modes (tucked in or deployed strand).
  • FIG. 6A very schematically, a helical antenna 62 with constant pitch and width, according to the prior art.
  • the curve 63 in FIG. 6B represents the intensity of the current i as a function of the height h along the axis X of the helical antenna 62. It can be seen that the distribution of the current i is substantially triangular.
  • FIG. 6C represents the equivalent diagram of the antenna 62: this antenna is equivalent to a pure inductance 64.
  • FIG. 7A very schematically, a helical antenna 72 according to the principle of the present invention, and which could be used in place of the helical antenna 2 of Figure 1.
  • the turns of the antenna 72 are in contact with each other at the top of the latter so as to constitute a continuous metallization.
  • the curve 73 of FIG. 7B which represents the intensity of the current i as a function of the height h along the axis X, clearly shows that the current distribution tends towards a trapezoidal shape.
  • FIG. 7C which represents the equivalent diagram of the antenna 72, illustrates that the latter is equivalent to an inductor 74 in series with a capacity 75.
  • FIG. 8A very schematically, a helical antenna 82 in accordance with the principle of the present invention, and which could be used in place of the helical antenna 2 of FIG. 1.
  • the turns of the 'antenna 82 are in contact with each other at the top of the latter so as to constitute a continuous metallization, and tightened without being in contact with each other immediately before reaching the top.
  • the rest of the propeller is at constant pitch.
  • the curve 83 of FIG. 8B which represents the intensity of the current i as a function of the height h according to the X axis shows clearly that the current distribution tends more and more (compared to FIG. 7B) towards a trapezoidal shape.
  • FIG. 8A very schematically, a helical antenna 82 in accordance with the principle of the present invention, and which could be used in place of the helical antenna 2 of FIG. 1.
  • the turns of the 'antenna 82 are in contact with each other at the top of the latter so as to constitute a
  • FIG. 8C which represents the equivalent diagram of the antenna 82, illustrates that the latter is equivalent to a first inductance 84 (corresponding to the part of the constant pitch propeller), in series with a second inductance 85 (corresponding to the part of the propeller with tight pitch) and with a capacity 86 (corresponding to the top of the propeller where the turns are in contact with each other).
  • the width of the electrical track constituting the propeller is optimized, in order to increase the area defined by the current distribution. A further improved efficiency and bandwidth are thus obtained for the antenna according to the invention.
  • the helical antenna 2 shown in FIG. 1 illustrates the principles which have just been exposed. It is represented diagrammatically in FIG. 3A, and accompanied in FIG. 3B by the corresponding curve 33 representing the intensity of the current i as a function of the height along the axis X. It is noted that the surface comprised between the curve 33 and the axes of coordinates is further increased relative to the area corresponding to Figures 7B or 8B. This has the effect of increasing the radiation resistance and therefore the efficiency and the bandwidth of the antenna.
  • FIGS. 4 and 5 show the equivalent diagrams of the antenna 1 respectively when the extractable strand 3 is in the retracted position and when it is in the deployed position.
  • Increasing the height of the antenna 1 by deploying the extractable strand 3 improves, in known manner, the efficiency of the antenna, by increasing its effective height and its radiation resistance.
  • the extractable strand 3 is not necessarily located outside of the helical antenna 2; in fact, if the support mandrel is hollow, the extractable strand may be inside the mandrel 7, which has the advantage of providing additional space savings.
  • FIGS. 10 and 11 have also shown possible variants for the extractable strand 3.
  • FIG. 10 represents a variant usable in place of the tape 12 of the extractable strand 3 of FIGS. 1, 2 and 9 (the element 15 has not been shown in figure 10).
  • a metallic conducting line 1012 is used which is deposited so as to form a crenellated line on a film of an insulating material constituting part of the covering 13.
  • the line 1012 is embedded in the covering 13.
  • a such a structure makes it possible to shorten the effective length of the extractable strand 3, while retaining an electrical length equal to half the wavelength. This reduces the space occupied by the extractable strand 3 inside the housing 5 of the radiotelephone.
  • the element 15 at the upper part of the strand 3, to obtain the same effect as that described above.
  • the spring 1112 is also embedded in a coating 13 made of an insulating material, and the advantages which it provides are identical to those obtained with the line 1012.
  • the insulating material constituting the covering 13 will be chosen both to give the strand 3 a certain flexibility and to ensure sufficient mechanical strength to protect the metal part which it contains.
  • the upper metal part of the strand 3, located immediately before the capacitive element 15, is connected to this the latter by an inductive structure 16. This improves the efficiency in the deployed position of the extractable strand 3.
  • the helical antenna 2 as well as all the variants which have been described therein, can be produced by metallic deposition on a support mandrel 7.
  • the helix can thus be obtained according to any conventional method (metallization then screen printing, metallization then masking and photolithography, according to the method described in patent application EP-0 465 658, etc.).
  • the propeller can be produced on the external or internal surface of a mandrel made of an insulating material (when this mandrel is tubular).
  • a mandrel made of an insulating material
  • the propeller 8 is produced on the outer surface of the mandrel 7 (as shown in FIG. 1), the metallization will be covered with a protective coating (not shown).
  • the thickness of the wall of the mandrel will preferably be small, to facilitate possible capacitive coupling with an extractable strand.
  • the proposed method of producing the propeller 8 by metallization is advantageous because it makes the helical antenna 2 very compact, which allows the latter to occupy the least possible space inside the housing 5 of the radiotelephone.
  • the reproducibility of the propeller thus produced is better compared to the use of a wound wire.
  • the flexible film 20 can consist in particular of Kapton, Mylar or Duroid (registered trademarks). Its shape constitutes the developed shape of the final shape that one wishes to give to the helical antenna. Then eliminating, by screen printing, photolithography or the like, the parts of the metallization which are not necessary, so as to obtain a pattern 21 such that, by joining by joining two opposite sides 20C and 20D of the film 20, a pitch helix is obtained and desired width.
  • the film 20 has for this purpose metallized vias 22, and on its face opposite to that comprising the pattern 21, around the metallized vias 22, metallized pellets 23 (see FIG. 14B) intended to ensure the electrical continuity of the assembly.
  • the film 20 is assembled by welding onto a mandrel (not shown) of the desired shape (see FIG. 14B).
  • This method has the advantage of being simpler to implement (depositing on a flat surface is simpler to carry out than depositing on a surface of revolution), and making it possible to give the helical antenna any shape (frustoconical, cylindrical, rectangular section, etc ).
  • the film 20 has, at its upper part, a rectangular "tab", with an area smaller than that of the film 20, on which we also see a metallization pattern comprising a central central part 26 full, surrounded by a spiraling 27.
  • This tab 24 is intended to be folded at a right angle during the assembly of the film 20 on a parallelepiped shape with rounded angles.
  • the solid central part 26 will then constitute the capacitive top of the helical antenna, and the spiraling the high inductance part.
  • the tab 24 can be entirely metallized by solid metallization.
  • the lower recess 28 of the film 20 will be used to produce the interconnection tab with the coaxial supply cable.
  • All the variants which have just been described for the antenna according to the invention comprise a supply by coaxial cable, this coaxial cable being connected on the one hand to the helical antenna, and on the other hand to the transmitter / receiver of the radiotelephone with which the antenna according to the invention is in relation.
  • the propeller 138 has two portions 138A and 138B.
  • the portion 138A consists of a metallization 1381, for example on the outer surface of the mandrel 7, of width and of variable pitch so as to produce a capacitive peak and a high inductance, in the same manner as in FIG. 1.
  • the part 138B comprises a metallization 1382 on the outer surface extending the metallization 1381 but having a constant pitch and width, and a corresponding metallization 1383 on the inner surface of the mandrel 7 (tubular) facing the metallization 1382 and wider than the latter .
  • the electrical length of the portion 138A is about a quarter of the wavelength, as is that of the portion 138B.
  • the lower part of the helical antenna 132 thus serves both as a radiating element (metallizations 1381 and 1382) and as a supply line (1382 and 1383), the metallization 1383 corresponding to the ground conductor, i.e. tell the outer conductor of the supply coaxial, and the metallization 1382 corresponding to the core of the supply coaxial (when the metallization 1381-1382 is located on the inner surface of the mandrel 7, the metallization 1383 is then of course outside).
  • the method of manufacturing the helical antenna according to FIGS. 13A and 13B can be one of the methods described above.
  • the antenna 132 can also be made by winding, although this is much less easy.
  • an antenna according to the invention does not necessarily have an extractable strand. Indeed, such a strand is only necessary to allow the antenna to operate whatever the conditions, and such a specification is not always formulated.
  • the fact of using a metallization method to manufacture the helical antenna according to the invention also makes it possible to easily produce circuits with constants distributed or located at the top of the antenna, or even additional impedance correction elements.
  • the essential characteristic of the invention is to produce a propeller with variable pitch and decreasing towards the top of the helical antenna.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)
  • Burglar Alarm Systems (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Transceivers (AREA)
EP94402293A 1993-10-14 1994-10-12 Antenne für tragbares Funkgerät, Verfahren zur Herstellung einer derartigen Antenne und tragbares Funkgerät mit einer derartigen Antenne Expired - Lifetime EP0649181B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9312226A FR2711277B1 (fr) 1993-10-14 1993-10-14 Antenne du type pour dispositif radio portable, procédé de fabrication d'une telle antenne et dispositif radio portable comportant une telle antenne.
FR9312226 1993-10-14

Publications (2)

Publication Number Publication Date
EP0649181A1 true EP0649181A1 (de) 1995-04-19
EP0649181B1 EP0649181B1 (de) 2003-04-23

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EP94402293A Expired - Lifetime EP0649181B1 (de) 1993-10-14 1994-10-12 Antenne für tragbares Funkgerät, Verfahren zur Herstellung einer derartigen Antenne und tragbares Funkgerät mit einer derartigen Antenne

Country Status (10)

Country Link
US (1) US5668559A (de)
EP (1) EP0649181B1 (de)
JP (1) JPH07176929A (de)
AT (1) ATE238614T1 (de)
AU (1) AU683907B2 (de)
CA (1) CA2118082A1 (de)
DE (1) DE69432548T2 (de)
FI (1) FI944798A (de)
FR (1) FR2711277B1 (de)
NZ (1) NZ264417A (de)

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EP0750364A2 (de) * 1995-06-20 1996-12-27 Murata Manufacturing Co., Ltd. Chip-Antenne
EP0790666A1 (de) * 1996-02-16 1997-08-20 Lk-Products Oy Kombinierte Struktur einer Helixantenne und einer dielektrischen Platte
US5709832A (en) * 1995-06-02 1998-01-20 Ericsson Inc. Method of manufacturing a printed antenna
DE19700356A1 (de) * 1997-01-08 1998-07-16 Siemens Ag Funkgerät
WO1998043313A1 (en) * 1997-03-20 1998-10-01 David Ganeshmoorthy Communication antenna and equipment
US5844525A (en) * 1995-06-02 1998-12-01 Hayes; Gerard James Printed monopole antenna
WO1999014819A1 (en) * 1997-09-15 1999-03-25 Ericsson, Inc. Dual-band helix antenna with parasitic element
US6336036B1 (en) 1998-07-08 2002-01-01 Ericsson Inc. Retractable dual-band tapped helical radiotelephone antennas
WO2002023673A1 (fr) * 2000-09-15 2002-03-21 France Telecom Antenne helicoïdale a pas variable, et procede correspondant
FR2814286A1 (fr) * 2000-09-15 2002-03-22 France Telecom Antenne helice a brins de largeur variable
US6456259B1 (en) 1998-01-29 2002-09-24 Siemens Aktiengesellschaft Radio equipment
EP1524722A1 (de) * 1997-03-27 2005-04-20 QUALCOMM Incorporated Ein Substrat für eine Wendelantenne und Verfahren zur Herstellung der Antenne
US6914580B2 (en) 2003-03-28 2005-07-05 Sarantel Limited Dielectrically-loaded antenna
US7372427B2 (en) 2003-03-28 2008-05-13 Sarentel Limited Dielectrically-loaded antenna
CN102299401A (zh) * 2011-05-25 2011-12-28 北京理工大学 一种信号干扰天线设备

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JP5274597B2 (ja) 2011-02-15 2013-08-28 原田工業株式会社 車両用ポールアンテナ
JP5654917B2 (ja) 2011-03-24 2015-01-14 原田工業株式会社 アンテナ装置
BR112014008546A2 (pt) * 2011-10-12 2017-04-18 Entropic Communications Inc antena contínua distribuída
USD726696S1 (en) 2012-09-12 2015-04-14 Harada Industry Co., Ltd. Vehicle antenna
US9893715B2 (en) 2013-12-09 2018-02-13 Shure Acquisition Holdings, Inc. Adaptive self-tunable antenna system and method
WO2016056935A1 (en) * 2014-10-07 2016-04-14 Llc "Topcon Positioning Systems" Impedance helical antenna forming п-shaped directional diagram
US9666938B2 (en) 2015-06-19 2017-05-30 Motorola Solutions, Inc. Antenna structure for multiband applications
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GB861229A (en) * 1952-04-08 1961-02-15 Standard Telephones Cables Ltd Radio frequency impedance matching section
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US5844525A (en) * 1995-06-02 1998-12-01 Hayes; Gerard James Printed monopole antenna
US5709832A (en) * 1995-06-02 1998-01-20 Ericsson Inc. Method of manufacturing a printed antenna
WO1996038874A1 (en) * 1995-06-02 1996-12-05 Ericsson Inc. Printed antenna having electrical length greater than physical length
EP0750364A2 (de) * 1995-06-20 1996-12-27 Murata Manufacturing Co., Ltd. Chip-Antenne
EP0750364A3 (de) * 1995-06-20 1997-05-07 Murata Manufacturing Co Chip-Antenne
EP0790666A1 (de) * 1996-02-16 1997-08-20 Lk-Products Oy Kombinierte Struktur einer Helixantenne und einer dielektrischen Platte
US5990848A (en) * 1996-02-16 1999-11-23 Lk-Products Oy Combined structure of a helical antenna and a dielectric plate
DE19700356A1 (de) * 1997-01-08 1998-07-16 Siemens Ag Funkgerät
US6392599B1 (en) 1997-03-20 2002-05-21 David Ganeshmoorthy Communication antenna and equipment
WO1998043313A1 (en) * 1997-03-20 1998-10-01 David Ganeshmoorthy Communication antenna and equipment
EP1524722A1 (de) * 1997-03-27 2005-04-20 QUALCOMM Incorporated Ein Substrat für eine Wendelantenne und Verfahren zur Herstellung der Antenne
US5923305A (en) * 1997-09-15 1999-07-13 Ericsson Inc. Dual-band helix antenna with parasitic element and associated methods of operation
WO1999014819A1 (en) * 1997-09-15 1999-03-25 Ericsson, Inc. Dual-band helix antenna with parasitic element
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US6336036B1 (en) 1998-07-08 2002-01-01 Ericsson Inc. Retractable dual-band tapped helical radiotelephone antennas
FR2814285A1 (fr) * 2000-09-15 2002-03-22 France Telecom Antenne helicoidale a pas variable, et procede correspondant
FR2814286A1 (fr) * 2000-09-15 2002-03-22 France Telecom Antenne helice a brins de largeur variable
US6836257B2 (en) 2000-09-15 2004-12-28 France Telecom Variable-pitch helical antenna, and corresponding method
WO2002023673A1 (fr) * 2000-09-15 2002-03-21 France Telecom Antenne helicoïdale a pas variable, et procede correspondant
US6914580B2 (en) 2003-03-28 2005-07-05 Sarantel Limited Dielectrically-loaded antenna
US7372427B2 (en) 2003-03-28 2008-05-13 Sarentel Limited Dielectrically-loaded antenna
CN102299401A (zh) * 2011-05-25 2011-12-28 北京理工大学 一种信号干扰天线设备
CN102299401B (zh) * 2011-05-25 2013-07-03 北京理工大学 一种信号干扰天线设备

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FI944798A0 (fi) 1994-10-12
NZ264417A (en) 1996-10-28
US5668559A (en) 1997-09-16
FI944798A (fi) 1995-04-15
JPH07176929A (ja) 1995-07-14
FR2711277B1 (fr) 1995-11-10
CA2118082A1 (fr) 1995-04-15
DE69432548D1 (de) 2003-05-28
AU683907B2 (en) 1997-11-27
AU7291794A (en) 1995-05-04
DE69432548T2 (de) 2004-03-04
EP0649181B1 (de) 2003-04-23
FR2711277A1 (fr) 1995-04-21
ATE238614T1 (de) 2003-05-15

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