EP0862240B1 - Verfahren zum Herstellen von Stabantennen und eine derart erzeugte Stabantenne - Google Patents

Verfahren zum Herstellen von Stabantennen und eine derart erzeugte Stabantenne Download PDF

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Publication number
EP0862240B1
EP0862240B1 EP19970830087 EP97830087A EP0862240B1 EP 0862240 B1 EP0862240 B1 EP 0862240B1 EP 19970830087 EP19970830087 EP 19970830087 EP 97830087 A EP97830087 A EP 97830087A EP 0862240 B1 EP0862240 B1 EP 0862240B1
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EP
European Patent Office
Prior art keywords
elongated body
whip
working
antennas
cavity
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
EP19970830087
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English (en)
French (fr)
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EP0862240A1 (de
Inventor
Alfonso Branca
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Top Glass SpA
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Top Glass SpA
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Filing date
Publication date
Application filed by Top Glass SpA filed Critical Top Glass SpA
Priority to DE1997600037 priority Critical patent/DE69700037T2/de
Priority to EP19970830087 priority patent/EP0862240B1/de
Priority to ES97830087T priority patent/ES2124640T3/es
Publication of EP0862240A1 publication Critical patent/EP0862240A1/de
Application granted granted Critical
Publication of EP0862240B1 publication Critical patent/EP0862240B1/de
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles

Definitions

  • the present invention relates to a method of making whip antennas and to a whip antenna made thereby.
  • whip antennas to be used on motor-vehicles for both receiving and transmitting radio signals.
  • whip antennas for motor-vehicles substantially have a greatly elongated cylindrical or cone-shaped conformation and are usually made either of a metal material or of a plastic material reinforced with fibres of different kinds.
  • whip antennas in which an outer spiral element made of steel, copper or other material is associated with the true antenna body so that on the whole an uneven surface is defined that, when impinged on by an air flow, better succeeds in breaking current lines, thereby greatly reducing those noise phenomena that are typical of antennas with a smooth surface.
  • the helix is subjected to a further work step in which part of the helix material is removed in order to obtain a surface grinding of the antenna. Finally to ensure a proper engagement between the spiral element and the antenna body, a final step is required for application of a insulating covering or of an outer tube of shrinkable type.
  • outer spiral element makes the antenna manufacturing process much more complicated due also to the fact that, in order to ensure an appropriate engagement between the spiral element and the antenna body, a final step is required for application of an outer sheath of plastic material, of the heat-shrinkable type for example, in order to cause a stable engagement of the spiral element.
  • a whip antenna in accordance with the present invention (only partly shown in the drawings) has been generally identified by numeral 1 in Fig. 1.
  • the whip antenna 1 comprises an elongated main body 2 that in this case preferably has a greatly elongated cone-shaped conformation.
  • the main body 2 may also be of cylindrical conformation, the shape being not of importance to the invention.
  • the main body 2 may be made of a plastic resin 3, a polyester resin for example.
  • the polyester resin incorporates particles, microgranules or microfibres in a preset amount for example, of an electrically conductive material such distributed as to give the whole elongated body 2 good electric and electromagnetic features and consequently a good capability to receive and transmit radio signals (see Figs. 3, 4, 5 and 6).
  • an electrically conductive material such distributed as to give the whole elongated body 2 good electric and electromagnetic features and consequently a good capability to receive and transmit radio signals (see Figs. 3, 4, 5 and 6).
  • the elongated body 2 at one outer surface 2a thereof shows a surface working defined by at least one or, optionally, more recesses 16 distributed along at least one longitudinal portion of the elongated body and such arranged that, when the antenna is in use, they reduce the turbulence effects and the resulting drag effects caused by air flows impinging on the antenna itself when it is installed on a moving vehicle.
  • the recesses are such formed that, section by section, they define shapes capable of conveniently directing the air flow in a manner adapted to minimize the turbulence and slipstream effects so that the antenna noise is consequently reduced.
  • a single recess 16 is provided which is defined by a continuous cavity of helical shape along the longitudinal portion of the elongated body.
  • This continuous cavity of helical shape has its axis corresponding with the elongated body axis and a predetermined pitch (p).
  • the longitudinal portion concerned with the surface working may correspond with part or all of the extension of the elongated body 2 outer surface.
  • the pitch (p) of the continuous cavity of helical shape may be constant or variable along the antenna axis. In any case, whether the cavity is of a constant or a variable pitch, it has an extension (e) measured in the longitudinal direction which is included between a minimum value (Figs.
  • the whip antenna 1 may be made either continuously, as shown in Fig. 7, or by the use of moulding techniques (not shown).
  • the manufacturing process is comprised of a first step in which a plastic resin in a liquid or fluid state is mixed with particles of an electrically conductive material. (This step is not shown in the figure).
  • a reinforcing fibre 3a is continuously unwound from a supply station 6 and moves on towards one or more guide grids 7 until it reaches a soaking station 8, for example consisting of one or more tanks inside which the fibre 3a suitably guided is immersed in the plastic resin mixed with electrically conductive material.
  • a soaking station 8 for example consisting of one or more tanks inside which the fibre 3a suitably guided is immersed in the plastic resin mixed with electrically conductive material.
  • the soaked fibres after one or more wringing steps, are sent to the workpiece preforming and forming stations 9.
  • polymerizer means 10 operates which for example consists of heating elements, lamps or still other devices that cause cross-linking of the workpiece which in this way takes a rigid structure.
  • Also provided downstream of the polymerization station is one or more driving units 11 carrying out movement of the workpiece which is ultimately sent to a transverse-cutting station 12 in order to produce elements of a discrete length (i.e. elongated bodies) that will subsequently undergo surface-grinding, painting and still further operations.
  • a surface-working step is also performed which causes formation of one or more of said recesses in at least one longitudinal portion of the elongated body.
  • said surface working is obtained by material removal and defines, as shown in the drawings, a single continuous recess extending over the outer surface of the longitudinal portion and identified by a cavity of substantially helical shape, as already said in detail in the preceding description concerning the structure of the whip antenna in accordance with the invention, to which reference is made.
  • the invention achieves important advantages.
  • a whip antenna can be manufactured that, although involving a surface working adapted to reduce the noise produced by same under operating conditions, it does not imply important additional costs due to production complexities or to the necessity of employing further structural elements in addition to those strictly required from the electromagnetic point of view.
  • the method of the invention is quite adapted to be combined with continuous working processes such as those for producing antennas in a plastic matrix with a reinforcing fibre.
  • antennas having different aerodynamic characteristics may be obtained by merely varying either the pitch (p) or the extension (e) or the depth (t).

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  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)

Claims (7)

  1. Verfahren zum Herstellen von Stabantennen, umfassend die Arbeitsschritte:
    Anfertigung eines länglichen Körpers (2), der fähig ist, Funksignale zu empfangen und zu senden, wobei dieser Anfertigungsarbeitsschritt folgende Unterschritte umfaßt:
    Imprägnieren einer vorbestimmten Verstärkungsfaser (3a) mit eimen plastischem Harz (3);
    Zuführung der imprägnierten Verstärkungsfaser (3a) zu einer Formstation (9) zur Erhaltung eines Halbfertigstranges;
    Erstarrung des Halbfertigstranges;
    Ausführung einer Oberflächenbearbeitung mindestens im Bereich einer Außenfläche (2a) eines vorbestimmten Längsabschnittes des länglichen Körpers (2), wobei die Oberflächenbearbeitung durch mindestens eine oder mehrere, auf der Außenfläche verteilte Vertiefungen (16) festgelegt ist, dadurch gekennzeichnet, daß vor dem Imprägnieren der vorbestimmten Verstärkungsfaser mit dem plastischem Harz (3) der Anfertigungsarbeitschritt den Unterschritt der Versetzung des plastischen Harzes (3) in flüssigem Zustand mit Teilchen eines elektrisch leitfähigen Materials (4) umfaßt, und dadurch, daß die Oberflächenbearbeitung ohne Hinzufügen von weiteren Bauelementen am länglichen Körper erfolgt.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Oberflächenbearbeitung durch Materialabtragung erfolgt.
  3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die mindestens eine Vertiefung (16) kontinuierlich ist und sich längs der Außenfläche des Längsabschnittes erstreckt.
  4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Vertiefung (16) eine Ausnehmung im wesentlichen schraubenliniger Form, deren Achse mit einer Längsachse des länglichen Körpers zusammenfällt, und mit vorgegebener Steigung (p) ist.
  5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß die Ausnehmung eine in Längsrichtung gemessene Ausdehnung (e) besitzt, die zwischen einem Mindestwert, bei dem die Ausdehnung (e) beträchtlich unterhalb der Steigung (p) in der Ausnehmung schraubenliniger Form liegt, und einem Höchstwert liegt, bei dem diese Ausdehnung (e) im wesentlichen denselben Wert der Steigung (p) besitzt.
  6. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Arbeitsschritt der Oberflächenbearbeitung gleichzeitig mit einem Schleifarbeitsschritt der Oberfläche des länglichen Körpers (2) durchgeführt wird.
  7. Stabantenne, dadurch gekennzeichnet, daß sie unter Verwendung des Verfahrens gemäß Anspruch 1 hergestellt wird.
EP19970830087 1997-02-28 1997-02-28 Verfahren zum Herstellen von Stabantennen und eine derart erzeugte Stabantenne Expired - Lifetime EP0862240B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE1997600037 DE69700037T2 (de) 1997-02-28 1997-02-28 Verfahren zum Herstellen von Stabantennen und eine derart erzeugte Stabantenne
EP19970830087 EP0862240B1 (de) 1997-02-28 1997-02-28 Verfahren zum Herstellen von Stabantennen und eine derart erzeugte Stabantenne
ES97830087T ES2124640T3 (es) 1997-02-28 1997-02-28 Procedimiento de fabricacion de antenas de varilla extensible y antena de varilla extensible asi realizada.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19970830087 EP0862240B1 (de) 1997-02-28 1997-02-28 Verfahren zum Herstellen von Stabantennen und eine derart erzeugte Stabantenne

Publications (2)

Publication Number Publication Date
EP0862240A1 EP0862240A1 (de) 1998-09-02
EP0862240B1 true EP0862240B1 (de) 1998-10-14

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19970830087 Expired - Lifetime EP0862240B1 (de) 1997-02-28 1997-02-28 Verfahren zum Herstellen von Stabantennen und eine derart erzeugte Stabantenne

Country Status (3)

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EP (1) EP0862240B1 (de)
DE (1) DE69700037T2 (de)
ES (1) ES2124640T3 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6741221B2 (en) * 2001-02-15 2004-05-25 Integral Technologies, Inc. Low cost antennas using conductive plastics or conductive composites
US8268222B2 (en) 2001-02-15 2012-09-18 Integral Technologies, Inc. Methods of making electrical motor components from conductive loaded resin-based materials
US6870516B2 (en) 2001-02-16 2005-03-22 Integral Technologies, Inc. Low cost antennas using conductive plastics or conductive composites
US7759002B2 (en) 2001-02-15 2010-07-20 Integral Technologies, Inc. Low cost electrical terminals manufactured from conductive loaded resin-based materials
DE102005061861A1 (de) * 2005-12-23 2007-06-28 GM Global Technology Operations, Inc., Detroit Antenne für ein Kraftfahrzeug
DE102017102050A1 (de) * 2017-02-02 2018-08-02 Hirschmann Car Communication Gmbh Stabantenne mit Antipfeifwendel

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2846344A1 (de) * 1978-10-25 1980-05-08 Daimler Benz Ag Windgeraeuscharme fahrzeugantenne
DE3822664A1 (de) * 1988-07-05 1989-02-16 Kathrein Werke Kg Stabfoermige fahrzeugantenne
JP2641959B2 (ja) * 1989-09-25 1997-08-20 原田工業 株式会社 自動車用アンテナ
FR2705497B1 (fr) * 1993-05-17 1995-07-21 Pizon Ernest Antenne pour véhicule automobile.
DE19516889A1 (de) * 1995-05-09 1996-11-14 Bosch Gmbh Robert Verfahren zum Herstellen einer Stabantenne

Also Published As

Publication number Publication date
DE69700037T2 (de) 1999-04-15
ES2124640T3 (es) 1999-02-01
EP0862240A1 (de) 1998-09-02
DE69700037D1 (de) 1998-11-19

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