EP0403741B1 - Whip antenna - Google Patents
Whip antenna Download PDFInfo
- Publication number
- EP0403741B1 EP0403741B1 EP90105964A EP90105964A EP0403741B1 EP 0403741 B1 EP0403741 B1 EP 0403741B1 EP 90105964 A EP90105964 A EP 90105964A EP 90105964 A EP90105964 A EP 90105964A EP 0403741 B1 EP0403741 B1 EP 0403741B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coil
- rod
- radio antenna
- length
- shaped radio
- 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
Links
Images
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
- H01Q9/32—Vertical arrangement of element
Definitions
- the invention is based on a rod-shaped radio antenna according to the preamble of claim 1.
- Such a rod-shaped radio antenna is known e.g. from document US-A-4,375,642, which, however, has the disadvantage in the case of mounting which deviates from the vertical that its all-round characteristic is no longer circular, but that it has strong drops of up to 30 dB.
- the invention has for its object to develop a rod-shaped radio antenna according to the preamble of claim 1 in such a way that a gain antenna is formed which has a circular antenna characteristic that is as uniform as possible even at an inclination angle of up to 40 ° with respect to the vertical.
- a preferred field of application for the invention is a radio antenna for the radio network C of the Irish Bundespost, that is to say for a frequency range from 450 to 470 MHz.
- 10 means a rod-shaped radio antenna with a flexible, electrically conductive spring element 11, which is preferably a plated-through coil spring.
- the spring element is connected at one end to an elastic rod 12 made of dielectric material.
- the elastic rod 12 carries a first coil SP1, which is electrically connected to the flexible spring element 11.
- a first length L1 of the radio antenna 10 comprises the flexible spring element 11 and the first coil SP1.
- the second coil SP2 is followed by a third coil SP3 within the second length L2, which is wound in the opposite manner to the second coil SP2 and is wound back and has a third length L3.
- a fourth coil SP4 is connected to the third coil SP3, which is wound parallel to the second coil SP2 and in the same direction as this and also has a length L3.
- the coils SP2 to SP4 are preferably wound from an uninterrupted piece of wire.
- radiator part 13 which, for example, consists of a braid pushed onto the rod 12 and has a length L4.
- the average operating wavelength of the radio range in question is designated by ⁇ .
- the braid used as the radiator part 13 can optionally also be replaced by a conductive lacquer layer or a tubular film, preferably a copper film.
- FIG. 3 shows the arrangement of the rod-shaped radio antenna 10 on a roof 14, for example for a motor vehicle body.
- the radio antenna 10 is preferably detachably connected in a foot piece 15 firmly connected to the roof.
- the angle ⁇ of the radio antenna 10 with respect to the vertical is preferably 0 to 40 °.
Landscapes
- Details Of Aerials (AREA)
- Support Of Aerials (AREA)
Abstract
Description
Die Erfindung geht von einer stabförmigen Funkantenne nach dem Oberbegriff des Anspruchs 1 aus.The invention is based on a rod-shaped radio antenna according to the preamble of claim 1.
Es ist eine derartige stabförmige Funkantenne bekannt z.B. aus dem Dokument US-A-4,375,642, die jedoch bei von der Vertikalen abweichender Montage den Nachteil aufweist, daß ihre Rundum-Charakteristik nicht mehr kreisförmig ist, sondern daß sie starke Einbrüche bis zu 30 dB aufweist.Such a rod-shaped radio antenna is known e.g. from document US-A-4,375,642, which, however, has the disadvantage in the case of mounting which deviates from the vertical that its all-round characteristic is no longer circular, but that it has strong drops of up to 30 dB.
Der Erfindung liegt die Aufgabe zugrunde, eine stabförmige Funkantenne gemäß dem Oberbegriff des Anspruchs 1 derart weiterzubilden, daß eine Gewinnantenne entsteht, die auch noch bei einem Neigungswinkel von bis zu 40° gegenüber der Vertikalen eine möglichst gleichmäßige kreisförmige Antennen-Charakteristik aufweist.The invention has for its object to develop a rod-shaped radio antenna according to the preamble of claim 1 in such a way that a gain antenna is formed which has a circular antenna characteristic that is as uniform as possible even at an inclination angle of up to 40 ° with respect to the vertical.
Diese Aufgabe wird bei einer stabförmigen Funkantenne gemäß dem Oberbegriff des Anspruchs 1 durch die im kennzeichnenden Teil dieses Anspruchs angegebenen Merkmale gelöst. Die mit der Erfindung erzielbaren Vorteile bestehen insbesondere darin, daß die stabförmige Funkantenne bei einem Einbau unter etwa 40° gegenüber der Vertikalen eine optimale Kreis-Charakteristik aufweist.This object is achieved in a rod-shaped radio antenna according to the preamble of claim 1 by the features specified in the characterizing part of this claim. The advantages that can be achieved with the invention are, in particular, that the rod-shaped radio antenna has an optimal circular characteristic when installed at approximately 40 ° relative to the vertical.
Ein bevorzugtes Anwendungsgebiet für die Erfindung ist eine Funkantenne für das Funknetz C der Deutschen Bundespost, das heißt für einen Frequenzbereich von 450 bis 470 MHz.A preferred field of application for the invention is a radio antenna for the radio network C of the Deutsche Bundespost, that is to say for a frequency range from 450 to 470 MHz.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung an Hand von drei Figuren dargestellt. Es zeigen
- Fig. 1
- eine Ansicht einer stabförmigen Funkantenne in vergrößertem Maßstab,
- Fig. 2
- ein Wicklungsschema für die Funkantenne nach Fig. 1 und
- Fig. 3
- eine Ansicht einer kompletten Dachantenne.
- Fig. 1
- 2 shows a view of a rod-shaped radio antenna on an enlarged scale,
- Fig. 2
- a winding diagram for the radio antenna according to Fig. 1 and
- Fig. 3
- a view of a complete roof antenna.
In Fig. 1 bedeutet 10 eine stabförmige Funkantenne mit einem biegsamen, elektrisch leitenden Federelement 11, das ist vorzugsweise eine durchkontaktierte Wendelfeder. Das Federelement ist mit seinem einen Ende mit einem elastischen Stab 12 aus dielektrischem Material verbunden. Der elastische Stab 12 trägt eine erste, mit dem biegsamen Federelement 11 elektrisch verbundene Spule SP1. Eine erste Länge L1 der Funkantenne 10 umfaßt das biegsame Federelement 11 und die erste Spule SP1. Auf einer zweiten, sich an die erste Länge L1 anschließenden Länge L2 des Stabes 12 sitzen mehrere Spulen (vgl. Fig. 1 und 2), und zwar eine zweite Spule SP2, die elektrisch mit der ersten Spule SP1 verbunden ist und die sich über die gesamte Länge L2 erstreckt. An die zweite Spule SP2 schließt sich innerhalb der zweiten Länge L2 eine dritte Spule SP3 an, die entgegengesetzt wie die zweite Spule SP2 und rücklaufend gewickelt ist und die eine dritte Länge L3 hat. Mit der dritten Spule SP3 ist eine vierte Spule SP4 verbunden, die parallel zu der zweiten Spule SP2 und in gleicher Richtung wie diese gewickelt ist und ebenfalls eine Länge L3 hat. Die Spulen SP2 bis SP4 sind vorzugsweise aus einem ununterbrochenen Drahtstück gewickelt.In Fig. 1, 10 means a rod-shaped radio antenna with a flexible, electrically
An das freie Ende der vierten Spule SP4 schließt sich ein Strahlerteil 13 an, der beispielsweise aus einem auf den Stab 12 geschobenen Geflecht besteht und eine Länge L4 hat.At the free end of the fourth coil SP4 there is a
Die Längen L1 bis L4 betragen vorzugsweise
An die Stelle des als Strahlerteil 13 verwendeten Geflechtes kann gegebenenfalls auch eine leitende Lackschicht oder eine rohrförmige Folie, vorzugsweise eine Kupferfolie, treten.The braid used as the
In Fig. 3 ist die Anordnung der stabförmigen Funkantenne 10 auf einem Dach 14 zum Beipiel einer Kraftfahrzeugkarosserie gezeigt. Die Funkantenne 10 ist in einem mit dem Dach fest verbundenen Fußstück 15 vorzugsweise lösbar verbunden. Der Winkel α der Funkantenne 10 gegenüber der Vertikalen beträgt vorzugsweise 0 bis 40°.FIG. 3 shows the arrangement of the rod-shaped
Claims (8)
- Rod-shaped radio antenna of a flexible electrically conductive spring element and an elastic rod, connected thereto, of dielectric material which carries coils which are electrically connected to one another, characterized in that the flexible spring element (11) and a first coil (SP1), electrically connected thereto, together have a length of
- Rod-shaped radio antenna according to Claim 1, characterized in that the radio antenna (10) is arranged at an angle (α) of 0...40° to the vertical.
- Rod-shaped radio antenna according to Claim 1 or 2, characterized in that the radiator section (13) is a conductive mesh applied to the elastic rod (12).
- Rod-shaped radio antenna according to Claim 1 or 2, characterized in that the radiator section (13) is an electrically conductive varnish applied to the elastic rod (12).
- Rod-shaped radio antenna according to Claim 1 or 2, characterized in that the radiator section (13) is an electrically conductive foil enclosing the elastic rod (12).
- Rod-shaped radio antenna according to one of Claims 1 to 5, characterized in that the elastic rod (12) is a glass fibre rod which conically tapers from the base of the radio antenna towards the free end.
- Rod-shaped radio antenna according to one of Claims 1 to 6, characterized in that the flexible spring element (11) and all coils (SP1...SP4) and the radiator section (13) are surrounded by a layer of insulating material.
- Rod-shaped radio antenna according to Claim 1, characterized in that the second to fourth coil (SP2...SP4) consist of a continuous piece of wire.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3919884A DE3919884C2 (en) | 1989-06-19 | 1989-06-19 | Rod-shaped radio antenna |
DE3919884 | 1989-06-19 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0403741A2 EP0403741A2 (en) | 1990-12-27 |
EP0403741A3 EP0403741A3 (en) | 1991-05-29 |
EP0403741B1 true EP0403741B1 (en) | 1994-06-01 |
Family
ID=6382985
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90105964A Expired - Lifetime EP0403741B1 (en) | 1989-06-19 | 1990-03-29 | Whip antenna |
Country Status (5)
Country | Link |
---|---|
US (1) | US5061942A (en) |
EP (1) | EP0403741B1 (en) |
AT (1) | ATE106612T1 (en) |
DE (2) | DE3919884C2 (en) |
DK (1) | DK0403741T3 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5359340A (en) * | 1992-09-30 | 1994-10-25 | Fujitsu Limited | Helical antenna for portable radio communication equipment |
CA2117561C (en) * | 1993-01-29 | 1998-04-28 | Paul John Moller | Antenna assembly for radio circuit and method therefor |
DE202005008338U1 (en) * | 2005-05-24 | 2005-12-22 | Fuba Automotive Gmbh & Co. Kg | Antenna configuration for radio reception in motor vehicle e.g. cabriolet, has bulk connection for transducers and arranged in roof system, over springy contact that is between movable metallic components of system and metallic carriage |
RU2755589C1 (en) * | 2020-03-23 | 2021-09-17 | Федеральное государственное казенное военное образовательное учреждение высшего образования "Военная академия войсковой противовоздушной обороны Вооруженных Сил Российской Федерации имени Маршала Советского Союза А.М. Василевского" Министерства обороны Российской Федерации | Common-mode straight-line vhf pin antenna array |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE864710C (en) * | 1951-08-21 | 1953-01-26 | Sihn Kg Wilhelm Jun | Flexible rod antenna, especially for vehicles |
US3541554A (en) * | 1967-10-09 | 1970-11-17 | Coil Research L | Tunable whip antenna |
DE1905444A1 (en) * | 1968-02-06 | 1970-09-03 | Yoshie Ohkubo | antenna |
DE2257352A1 (en) * | 1972-11-22 | 1974-05-30 | Kathrein Werke Kg | VEHICLE ANTENNA |
US4097867A (en) * | 1975-09-23 | 1978-06-27 | James Joseph Eroncig | Helical antenna encased in fiberglass body |
US4101898A (en) * | 1976-07-26 | 1978-07-18 | David Lee Ingram | Base fed, top-loaded vertical whip antenna |
US4161737A (en) * | 1977-10-03 | 1979-07-17 | Albright Eugene A | Helical antenna |
US4163981A (en) * | 1978-03-27 | 1979-08-07 | Wilson Thomas J | Spring tunable helical whip antenna |
US4490727A (en) * | 1979-10-18 | 1984-12-25 | Mobile Mark, Inc. | Adjustable top loaded antenna |
US4404564A (en) * | 1980-01-09 | 1983-09-13 | Wilson George P | Attachment for antennas to improve reception and transmission |
DE3036084A1 (en) * | 1980-09-25 | 1982-04-29 | Robert Bosch Gmbh, 7000 Stuttgart | ROD AERIAL, IN PARTICULAR FOR VHF BROADCAST RECEPTION |
US4675687A (en) * | 1986-01-22 | 1987-06-23 | General Motors Corporation | AM-FM cellular telephone multiband antenna for motor vehicle |
DE8622412U1 (en) * | 1986-08-21 | 1986-11-20 | Hummel, Peter, 7012 Fellbach | Collinear mobile antenna |
-
1989
- 1989-06-19 DE DE3919884A patent/DE3919884C2/en not_active Expired - Fee Related
-
1990
- 1990-03-29 DE DE59005882T patent/DE59005882D1/en not_active Expired - Lifetime
- 1990-03-29 AT AT90105964T patent/ATE106612T1/en not_active IP Right Cessation
- 1990-03-29 EP EP90105964A patent/EP0403741B1/en not_active Expired - Lifetime
- 1990-03-29 DK DK90105964.2T patent/DK0403741T3/en active
- 1990-06-19 US US07/540,339 patent/US5061942A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DK0403741T3 (en) | 1994-09-19 |
DE3919884A1 (en) | 1990-12-20 |
DE59005882D1 (en) | 1994-07-07 |
DE3919884C2 (en) | 1994-05-19 |
EP0403741A3 (en) | 1991-05-29 |
US5061942A (en) | 1991-10-29 |
ATE106612T1 (en) | 1994-06-15 |
EP0403741A2 (en) | 1990-12-27 |
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