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EP0777297A1 - Stabantenne - Google Patents

Stabantenne Download PDF

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Publication number
EP0777297A1
EP0777297A1 EP96830529A EP96830529A EP0777297A1 EP 0777297 A1 EP0777297 A1 EP 0777297A1 EP 96830529 A EP96830529 A EP 96830529A EP 96830529 A EP96830529 A EP 96830529A EP 0777297 A1 EP0777297 A1 EP 0777297A1
Authority
EP
European Patent Office
Prior art keywords
electrically conductive
conductive material
antenna according
main body
plastic resin
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
EP96830529A
Other languages
English (en)
French (fr)
Other versions
EP0777297B1 (de
Inventor
Alfonso Branca
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.)
Top Glass SpA
Original Assignee
Top Glass SpA
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 Top Glass SpA filed Critical Top Glass SpA
Publication of EP0777297A1 publication Critical patent/EP0777297A1/de
Application granted granted Critical
Publication of EP0777297B1 publication Critical patent/EP0777297B1/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
    • 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

Definitions

  • the present invention relates to a whip antenna to be used in particular on motor-vehicles for both receiving and transmitting radio signals.
  • whip antennas for motor-vehicles substantially have a greatly elongated cone-shaped conformation and are usually made of a metal material or a plastic material reinforced with fibres of different kinds.
  • the last-mentioned type of antenna has been recently very successful on the market due to the good features in terms of lightness in weight, mechanical flexibility and reduced production costs that said antennas are capable of ensuring.
  • antennas made of reinforced plastic material must necessarily have a thread-like element inside them, which element is made of an electrically conductive material, copper for example, and extends along the longitudinal axis of the antenna itself.
  • the element of electrically conductive material must be put in place perfectly in register with the longitudinal antenna axis in order to ensure a perfectly uniform behaviour in the finished antenna both from an electromagnetic and from a mechanical point of view.
  • a whip antenna in accordance with the present invention has been generally identified by reference numeral 1.
  • the whip antenna 1 comprises a main body 2 of elongated conformation which in this case preferably is in the form of a cone.
  • the main body 2 is made of a plastic resin 3, a polyester resin for example, into which a predetermined reinforcing fibre 3a, preferably consisting of a conventional glass fibre, is incorporated.
  • the plastic resin 3 also incorporates particles 4, micrograins or microfibres for example, of an electrically conductive material in a preset amount, such distributed as to give the whole main body 2 good electric and electromagnetic features and, as a result, a good capability to receive and transmit radio signals.
  • particles 4 of an electrically conductive material are homogeneously distributed in the plastic resin 3 in such a manner as to give the main body 2 a symmetric behaviour from an electromagnetic point of view.
  • the electrically conductive material can consist of any material capable of being brought to a very reduced particle size, having good conductivity features and, at the same time, adapted to conveniently bond to a plastic matrix.
  • powders of acetylene black, graphite, carbon black or still other materials can be employed as the electrically conductive material.
  • this material in order to ensure a sufficiently good operation of the finished antenna, this material must be provided in a mass rate at least higher than 2% with respect to the overall mass of the main body. Preferably this mass rate should be included between 5 and 10% in order to impart good electric and electromagnetic features to the antenna.
  • the main body 2 to further comprise an electrically conductive thread-like element 5 extending along the whole longitudinal axis of the main body itself.
  • This thread-like element can be made of either a metal material, such as copper, aluminium or other, or another material, carbon material for example, which combines excellent electrical conductivity characteristics with excellent mechanical characteristics.
  • the whip antenna 1 can be made both continuously, as shown in Fig. 1, and with the use of conventional moulding techniques (not shown).
  • the reinforcing fibre 3a is continuously unwound from a supply station 6 and moves towards one or more guide grids 7 until it reaches a soaking station 8 consisting for example of one or more tanks inside which the fibre 3a suitably guided is immersed in a resin 3 in a liquid state to be then sent, after one or more optional wringing steps, to the preforming and forming stations 9 of the piece being worked.
  • polymerizer means 10 operates which consists for example of heating elements, lamps or other devices causing cross-linking of the piece that in this way achieves a rigid structure.
  • the whip antenna 1 can obviously be obtained by extrusion (using thermoplastic resins, for example) or by moulding, as described in claim 13.
  • the invention achieves important advantages.
  • the antenna in accordance with the invention can be made at more reduced costs than in the past, since careful centering operations of the thread-like element with respect to the antenna body are no longer necessary, neither do inspections on the electrical continuity of the thread-like element need to be carried out.
  • the whip antenna in accordance with the invention achieves important advantages in terms of productivity and considerable improvements in terms of easy installation and also in terms of performance as regards both transmission-reception of signals and mechanical behaviour.

Landscapes

  • Details Of Aerials (AREA)
  • Waveguide Aerials (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
EP96830529A 1995-11-28 1996-10-15 Stabantenne Expired - Lifetime EP0777297B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI952477 1995-11-28
IT95MI002477A IT1277250B1 (it) 1995-11-28 1995-11-28 Antenna a stilo

Publications (2)

Publication Number Publication Date
EP0777297A1 true EP0777297A1 (de) 1997-06-04
EP0777297B1 EP0777297B1 (de) 2002-01-09

Family

ID=11372610

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96830529A Expired - Lifetime EP0777297B1 (de) 1995-11-28 1996-10-15 Stabantenne

Country Status (5)

Country Link
EP (1) EP0777297B1 (de)
AT (1) ATE211862T1 (de)
DE (1) DE69618435T2 (de)
ES (1) ES2170848T3 (de)
IT (1) IT1277250B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7852269B2 (en) * 2006-08-09 2010-12-14 Daido Tokushuko Kabushiki Kaisha Ultrawideband communication antenna

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2312864A1 (fr) * 1975-05-29 1976-12-24 Etud Rech Chimique Lab Antenne radio-electrique composite, specialement antenne d'emission
US4134120A (en) * 1976-10-12 1979-01-09 Coastal Engineered Products Company, Inc. Whip antenna formed of electrically conductive graphite strands embedded in a resin material
EP0040674A1 (de) * 1980-05-27 1981-12-02 Kathrein-Werke Kg Stabantenne
JPS6265501A (ja) * 1985-09-17 1987-03-24 Dx Antenna Co Ltd アンテナ素子及びその製造方法
EP0336738A2 (de) * 1988-04-06 1989-10-11 BICC Public Limited Company Herstellung eines am Umfang festen, flexiblen Rohres für ein optisches Kabel
FR2660116A1 (fr) * 1990-03-26 1991-09-27 Facon Antenne de reception des ondes radio-electriques.

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2312864A1 (fr) * 1975-05-29 1976-12-24 Etud Rech Chimique Lab Antenne radio-electrique composite, specialement antenne d'emission
US4134120A (en) * 1976-10-12 1979-01-09 Coastal Engineered Products Company, Inc. Whip antenna formed of electrically conductive graphite strands embedded in a resin material
EP0040674A1 (de) * 1980-05-27 1981-12-02 Kathrein-Werke Kg Stabantenne
JPS6265501A (ja) * 1985-09-17 1987-03-24 Dx Antenna Co Ltd アンテナ素子及びその製造方法
EP0336738A2 (de) * 1988-04-06 1989-10-11 BICC Public Limited Company Herstellung eines am Umfang festen, flexiblen Rohres für ein optisches Kabel
FR2660116A1 (fr) * 1990-03-26 1991-09-27 Facon Antenne de reception des ondes radio-electriques.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 11, no. 257 (E - 534) 20 August 1987 (1987-08-20) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7852269B2 (en) * 2006-08-09 2010-12-14 Daido Tokushuko Kabushiki Kaisha Ultrawideband communication antenna

Also Published As

Publication number Publication date
DE69618435T2 (de) 2002-09-26
EP0777297B1 (de) 2002-01-09
ES2170848T3 (es) 2002-08-16
IT1277250B1 (it) 1997-11-05
ITMI952477A0 (de) 1995-11-28
ITMI952477A1 (it) 1997-05-28
DE69618435D1 (de) 2002-02-14
ATE211862T1 (de) 2002-01-15

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