EP0406564B1 - Rod antenna for two frequency ranges - Google Patents

Rod antenna for two frequency ranges Download PDF

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Publication number
EP0406564B1
EP0406564B1 EP90110326A EP90110326A EP0406564B1 EP 0406564 B1 EP0406564 B1 EP 0406564B1 EP 90110326 A EP90110326 A EP 90110326A EP 90110326 A EP90110326 A EP 90110326A EP 0406564 B1 EP0406564 B1 EP 0406564B1
Authority
EP
European Patent Office
Prior art keywords
bar
rod
antenna
type antenna
conductive
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
EP90110326A
Other languages
German (de)
French (fr)
Other versions
EP0406564A2 (en
EP0406564A3 (en
Inventor
Horst Dörrie
Uwe Dipl.-Ing. Militz
Heinrich Dipl.-Ing. Wilken
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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
Priority claimed from DE3922042A external-priority patent/DE3922042A1/en
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0406564A2 publication Critical patent/EP0406564A2/en
Publication of EP0406564A3 publication Critical patent/EP0406564A3/en
Application granted granted Critical
Publication of EP0406564B1 publication Critical patent/EP0406564B1/en
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
    • H01Q1/40—Radiating elements coated with or embedded in protective material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • 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 invention is based on a radiator according to the preamble of claim 1.
  • Such a radiator is known which is suitable for radio traffic and for radio reception (VHF, K, M, L).
  • the known radiator has the disadvantage that its base point must be conductively connected to ground via a foot piece, that is to say to the body of a motor vehicle. Therefore, the known radiator is not suitable for the so-called one-button technique, in which the radiator is attached isolated from the ground.
  • Another disadvantage of the known radiator is that it has a metal tube surrounding the relatively thin, rod-shaped radiator, which is insulated from the rod-shaped radiator by insulating material parts, at about half its length.
  • the invention has for its object to develop the rod-shaped radiator according to the preamble of claim 1 such that the radiator does not have to be connected to ground at its base and that it can be manufactured with the same diameter over its entire length.
  • the rod-shaped radiator forming a gain antenna has a high-impedance base point in the higher of the two frequency ranges, that is, preferably a radio range of 450 MHz, so that assembly using single-button technology is possible.
  • the radiator has a uniform thickness over its entire length, which simplifies the manufacture of the radiator, and that additional insulating material parts can be dispensed with.
  • a preferred area of application for the rod-shaped radiator is a vehicle radio antenna, which is also suitable for radio reception.
  • 10 denotes a rod-shaped radiator for two different frequency ranges, for example the radio range and the radio range.
  • the radiator comprises a cylindrical rod 11 made of a dielectric material, preferably of glass fiber, which contains a coaxial inner conductor 12 which extends over the entire length of the radiator.
  • the inner conductor 12 emerges at the lower end of the rod 11.
  • the entire length L 3/2 ⁇ of the radiator 10 comes into effect during radio reception.
  • L1 ⁇ / 2 long range of the radiator 10 comes into effect, which is high-resistance in this range and therefore does not have a ground connection needed.
  • rod 15 which tapers conically from the base point of the radiator and, as in the exemplary embodiment according to FIG. 1, likewise carries a conductive coating 16 in its central region.
  • a cylindrical rod 20 which carries a conductive braid 21 in the central region of the length L2.
  • the conductive braid is pushed onto the rod 20, for example.
  • the 1 can also be formed by a conductive film or a thin-walled tube part 25 (cf. FIG. 4).
  • the film and the thin-walled tube part 25 are preferably made of copper and can be injected into the rod 26 during the manufacture of the radiator, so that the film or the tube part does not protrude beyond the outer surface of the rod 26.
  • radiators shown in FIGS. 1 to 4 are covered, for example, with an insulating tube, which is preferably a shrink tube; see. the hose 27 shown shortened in FIG. 4.
  • an insulating tube which is preferably a shrink tube; see. the hose 27 shown shortened in FIG. 4.

Abstract

2.1 The invention is based on the object of developing a known rod antenna, which consists of a thin rod and a tube surrounding the central region of the rod in an insulating manner, in such a manner that the antenna requires no foot which has to be connected to earth and such that it has an approximately uniform thickness over its entire length. 2.2 The solution of the object consists of a 3/2 lambda long rod (11) which consists of a dielectric material, containing a coaxial inner conductor (12) which extends over the entire length of the rod. The rod (11) is surrounded in its central lambda /2 long region by a conductive coating (13). lambda in this case means the average operating wavelength of the higher frequency range. 2.3 A preferred field of application for the rod antenna is a vehicle antenna, which is suitable for radio traffic and for broadcast reception. 3. The drawing shows a view of a rod antenna. <IMAGE>

Description

Die Erfindung geht von einem Strahler nach dem Oberbegriff des Anspruchs 1 aus.The invention is based on a radiator according to the preamble of claim 1.

Stand der TechnikState of the art

Es ist ein derartiger Strahler bekannt, der für den Funkverkehr und für den Rundfunkempfang (UKW, K, M, L) geeignet ist. Der bekannte Strahler hat den Nachteil, daß sein Fußpunkt über ein Fußstück mit Masse, das heißt bei einem Kraftfahrzeug mit dessen Karosserie, leitend verbunden sein muß. Daher eignet sich der bekannte Strahler nicht für die sogenannte Einknöpftechnik, bei der der Strahler isoliert gegenüber Masse befestigt wird. Ein weiterer Nachteil des bekannten Strahlers besteht darin, daß er auf etwa halber Länge ein den verhältnismäßig dünnen, stabförmigen Strahler umgebendes Metallrohr aufweist, das durch Isolierstoffteile gegenüber dem stabförmigen Strahler isoliert ist.Such a radiator is known which is suitable for radio traffic and for radio reception (VHF, K, M, L). The known radiator has the disadvantage that its base point must be conductively connected to ground via a foot piece, that is to say to the body of a motor vehicle. Therefore, the known radiator is not suitable for the so-called one-button technique, in which the radiator is attached isolated from the ground. Another disadvantage of the known radiator is that it has a metal tube surrounding the relatively thin, rod-shaped radiator, which is insulated from the rod-shaped radiator by insulating material parts, at about half its length.

Aufgabetask

Der Erfindung liegt die Aufgabe zugrunde, den stabförmigen Strahler gemäß dem Oberbegriff des Anspruchs 1 derart weiterzubilden, daß der Strahler an seinem Fußpunkt nicht mit Masse verbunden werden muß und daß er über seine gesamte Länge mit gleichem Durchmesser herstellbar ist.The invention has for its object to develop the rod-shaped radiator according to the preamble of claim 1 such that the radiator does not have to be connected to ground at its base and that it can be manufactured with the same diameter over its entire length.

Lösungsolution

Diese Aufgabe wird bei einem stabförmigen Strahler gemäß dem Oberbegriff des Anspruchs 1 durch die im kennzeichnenden Teil dieses Anspruchs angegebenen Merkmale gelöst. Der mit der Erfindung erzielbare Vorteil besteht insbesondere darin, daß der eine Gewinnantenne bildende stabförmige Strahler in dem höheren der beiden Frequenzbereiche, das ist vorzugsweise ein Funkbereich von 450 MHz, einen hochohmigen Fußpunkt aufweist, so daß eine Montage in Einknöpftechnik möglich ist. Als weiterer Vorteil ist anzusehen, daß der Strahler über seine gesamte Länge eine gleichmäßige Dicke aufweist, wodurch sich die Herstellung des Strahlers vereinfacht, und daß auf zusätzliche Isolierstoffteile verzichtet werden kann.This object is achieved in a rod-shaped radiator according to the preamble of claim 1 by the features specified in the characterizing part of this claim. The advantage achievable with the invention is in particular in that the rod-shaped radiator forming a gain antenna has a high-impedance base point in the higher of the two frequency ranges, that is, preferably a radio range of 450 MHz, so that assembly using single-button technology is possible. Another advantage is that the radiator has a uniform thickness over its entire length, which simplifies the manufacture of the radiator, and that additional insulating material parts can be dispensed with.

Ein bevorzugtes Anwendungsgebiet für den stabförmigen Strahler ist eine Fahrzeug-Funkantenne, die auch für den Rundfunkempfang geeignet ist.A preferred area of application for the rod-shaped radiator is a vehicle radio antenna, which is also suitable for radio reception.

Beschreibungdescription

Vier Ausführungsbeispiele der Erfindung sind in der Zeichnung an Hand mehrerer Figuren dargestellt und werden im folgenden näher erläutert. Es zeigen

Fig. 1
einen stabförmigen Strahler in einer ersten Ausführungsform,
Fig. 2
einen stabförmigen Strahler in einer zweiten Ausführungsform,
Fig. 3
einen stabförmigen Strahler in einer dritten Ausführungsform und
Fig. 4
einen stabförmigen Strahler in einer vierten Ausführungsform.
Four exemplary embodiments of the invention are shown in the drawing using several figures and are explained in more detail below. Show it
Fig. 1
a rod-shaped radiator in a first embodiment,
Fig. 2
a rod-shaped radiator in a second embodiment,
Fig. 3
a rod-shaped radiator in a third embodiment and
Fig. 4
a rod-shaped radiator in a fourth embodiment.

In Fig. 1 bezeichnet 10 einen stabförmigen Strahler für zwei verschiedene Frequenzbereiche, zum Beispiel den Funkbereich und den Rundfunkbereich. Der Strahler umfaßt einen zylindrischen Stab 11 aus einem dielektrischen Material, vorzugsweise aus Glasfiber, der einen sich über die gesamte Länge des Strahlers erstreckenden koaxialen Innenleiter 12 enthält. Der Innenleiter 12 tritt am unteren Ende des Stabes 11 ins Freie. Zwischen einem unteren, L1 = λ/2 langen und einem oberen, gleichlangen Bereich befindet sich auf dem Stab 11 ein nicht mit Masse verbundener leitender Belag 13 der Länge L2 = λ/2. Die gesamte Länge des Strahlers 10 beträgt L = 3/2 λ, wobei λ die mittlere Betriebswellenlänge des betreffenden Funkbereiches ist.In FIG. 1, 10 denotes a rod-shaped radiator for two different frequency ranges, for example the radio range and the radio range. The radiator comprises a cylindrical rod 11 made of a dielectric material, preferably of glass fiber, which contains a coaxial inner conductor 12 which extends over the entire length of the radiator. The inner conductor 12 emerges at the lower end of the rod 11. Between a lower, L1 = λ / 2 long and an upper, equally long area, there is a conductive coating 13 of length L2 = λ / 2, not connected to ground, on the rod 11. The total length of the radiator 10 is L = 3/2 λ, where λ is the average operating wavelength of the radio range in question.

Beim Rundfunkempfang kommt die gesamte Länge L = 3/2 λ des Strahlers 10 zur Wirkung. Für den Funkverkehr, der in einem vergleichsweise hohen Frequenzbereich stattfindet, zum Beispiel zwischen 450 ... 470 MHz, kommt nur der untere, L1 = λ/2 lange Bereich des Strahlers 10 zur Wirkung, der in diesem Bereich hochohmig ist und daher keinen Masseanschluß benötigt.The entire length L = 3/2 λ of the radiator 10 comes into effect during radio reception. For radio communication that takes place in a comparatively high frequency range, for example between 450 ... 470 MHz, only the lower, L1 = λ / 2 long range of the radiator 10 comes into effect, which is high-resistance in this range and therefore does not have a ground connection needed.

Wie in Fig. 2 gezeigt, kann auch ein sich vom Fußpunkt des Strahlers aus konisch verjüngender Stab 15 angewendet werden, der wie in dem Ausführungsbeispiel nach Fig. 1 ebenfalls in seinem mittleren Bereich einen leitenden Belag 16 trägt.As shown in FIG. 2, it is also possible to use a rod 15 which tapers conically from the base point of the radiator and, as in the exemplary embodiment according to FIG. 1, likewise carries a conductive coating 16 in its central region.

In Fig. 3 ist ein zylindrischer Stab 20 gezeigt, der im mittleren Bereich der Länge L2 ein leitendes Geflecht 21 trägt. Das leitende Geflecht ist beispielsweise auf den Stab 20 aufgeschoben.In Fig. 3, a cylindrical rod 20 is shown, which carries a conductive braid 21 in the central region of the length L2. The conductive braid is pushed onto the rod 20, for example.

Der leitende Belag 13 nach Fig. 1 kann auch durch eine leitende Folie oder ein dünnwandiges Rohrteil 25 (vgl. Fig. 4) gebildet sein. Die Folie und das dünnwandige Rohrteil 25 bestehen vorzugsweise aus Kupfer und können bei der Herstellung des Strahlers in den Stab 26 miteingespritzt werden, so daß die Folie bzw. das Rohrteil nicht über die Mantelfläche des Stabes 26 hinausragen.1 can also be formed by a conductive film or a thin-walled tube part 25 (cf. FIG. 4). The film and the thin-walled tube part 25 are preferably made of copper and can be injected into the rod 26 during the manufacture of the radiator, so that the film or the tube part does not protrude beyond the outer surface of the rod 26.

Die in den Fig. 1 bis 4 gezeigten Strahler werden beispielsweise mit einem isolierenden Schlauch, das ist vorzugsweise ein Schrumpfschlauch, überzogen; vgl. den in Fig. 4 verkürzt dargestellten Schlauch 27.The radiators shown in FIGS. 1 to 4 are covered, for example, with an insulating tube, which is preferably a shrink tube; see. the hose 27 shown shortened in FIG. 4.

Claims (7)

  1. A bar-type antenna for two frequency ranges, having a conductor which is surrounded, on a part of its length, by a coaxial tubular conductor insulated in relation to the conductor, wherein a bar (11) of length L = 3/2 λ of a dielectric material contains a coaxial inner conductor (12) extending over the entire length of the bar, wherein the bar is surrounded, in its central region having a length of L2 = λ/2, by a conductive covering (13), and wherein λ is the mean operating wavelength of the higher frequency range.
  2. The bar-type antenna as claimed in claim 1, wherein the conductive covering (13) comprises a conductive lacquer.
  3. The bar-type antenna as claimed in claim 1, wherein the conductive covering (13) is an electrically conductive mesh (21).
  4. The bar-type antenna as claimed in claim 1, wherein the conductive covering (13) is a conductive foil or a thin-walled tubular part (25).
  5. The bar-type antenna as claimed in one of claims 1 to 4, wherein the bar (11) is a glass fiber bar.
  6. The bar-type antenna as claimed in one of claims 1 to 5, wherein the bar (15) tapers conically toward its free end.
  7. The bar-type antenna as claimed in one of claims 1 to 6, wherein the bar (11), including the conductive covering (13), is covered over with a tubing (27) of insulating material.
EP90110326A 1989-07-05 1990-05-31 Rod antenna for two frequency ranges Expired - Lifetime EP0406564B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3922042 1989-07-05
DE3922042A DE3922042A1 (en) 1989-06-19 1989-07-05 Radio antenna whip for dual frequency operation - uses three section coaxial construction with modified central section

Publications (3)

Publication Number Publication Date
EP0406564A2 EP0406564A2 (en) 1991-01-09
EP0406564A3 EP0406564A3 (en) 1991-09-25
EP0406564B1 true EP0406564B1 (en) 1994-11-30

Family

ID=6384315

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90110326A Expired - Lifetime EP0406564B1 (en) 1989-07-05 1990-05-31 Rod antenna for two frequency ranges

Country Status (5)

Country Link
EP (1) EP0406564B1 (en)
JP (1) JP3171843B2 (en)
AT (1) ATE114876T1 (en)
DE (1) DE59007811D1 (en)
DK (1) DK0406564T3 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE507640C2 (en) 1992-03-19 1998-06-29 Telia Ab Device for antenna arrangement
US6756552B2 (en) 2001-02-23 2004-06-29 Agilent Technologies, Inc. Multi-pole conductive liquid-based switch device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1547136A (en) * 1978-02-07 1979-06-06 Marconi Co Ltd Radio antennae
US4229743A (en) * 1978-09-22 1980-10-21 Shakespeare Company Multiple band, multiple resonant frequency antenna
US4491850A (en) * 1981-07-20 1985-01-01 David Cutler Antenna formed of series of metallic and non-metallic conductive sections

Also Published As

Publication number Publication date
JP3171843B2 (en) 2001-06-04
JPH0344101A (en) 1991-02-26
DE59007811D1 (en) 1995-01-12
EP0406564A2 (en) 1991-01-09
DK0406564T3 (en) 1995-05-01
EP0406564A3 (en) 1991-09-25
ATE114876T1 (en) 1994-12-15

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