EP0397070B1 - Antenna with a parabolic reflector - Google Patents

Antenna with a parabolic reflector Download PDF

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Publication number
EP0397070B1
EP0397070B1 EP90108522A EP90108522A EP0397070B1 EP 0397070 B1 EP0397070 B1 EP 0397070B1 EP 90108522 A EP90108522 A EP 90108522A EP 90108522 A EP90108522 A EP 90108522A EP 0397070 B1 EP0397070 B1 EP 0397070B1
Authority
EP
European Patent Office
Prior art keywords
holding plate
reflector
groove
antenna
ring
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
EP90108522A
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German (de)
French (fr)
Other versions
EP0397070A2 (en
EP0397070A3 (en
Inventor
Bernd Dipl.-Ing. Anger
Klaus-Dieter Noack
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.)
Kabelmetal Electro GmbH
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Kabelmetal Electro GmbH
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Filing date
Publication date
Application filed by Kabelmetal Electro GmbH filed Critical Kabelmetal Electro GmbH
Publication of EP0397070A2 publication Critical patent/EP0397070A2/en
Publication of EP0397070A3 publication Critical patent/EP0397070A3/en
Application granted granted Critical
Publication of EP0397070B1 publication Critical patent/EP0397070B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
    • H01Q19/12—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces wherein the surfaces are concave
    • H01Q19/13—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces wherein the surfaces are concave the primary radiating source being a single radiating element, e.g. a dipole, a slot, a waveguide termination

Definitions

  • the invention relates to an antenna with a parabolic reflector and at least one feed line, at the free end of which an exciter is attached, in which in a central opening of the reflector a feed plate, which surrounds the opening as a rigid, tubular metal component and closes the opening, is attached is (U.S. Patent 3,864,688).
  • Antennas with a parabolic reflector are used, for example, for directional radio, satellite radio or radio location. They can be used to illuminate the reflector directly or to illuminate it using a subreflector (Cassegrain principle). "Illumination” is intended to encompass both directions of transmission of the electromagnetic waves, that is to say both waves to be emitted and waves to be received.
  • Exciters are used for illumination, which are arranged at the free end of at least one feed line. “Exciters” can be, for example, dipole exciters or also polarization switches in which two or more electromagnetic waves can be guided. “Exciter” can also be the appropriately shaped free end of a feed line.
  • the feed line can be a coaxial line or a waveguide.
  • the invention is based on the object of specifying an antenna with a parabolic reflector and a feed line with exciter fastened in a holding plate, which enables the holding plate to be easily rotated without tilting.
  • the pins protrude into the groove of the holding plate, so that the latter is fixed in the axial direction.
  • This position is so stable by the pins that the feed line, which projects essentially from one side of the holding plate with the exciter connected, cannot tilt or tilt the holding plate.
  • the retaining plate is therefore easily rotatable in the circumferential direction after loosening any additional fasteners that may be present. The exciter can then be turned into the position required for optimal transmission of the electromagnetic waves without great effort.
  • Fig. 1 an antenna with a parabolic reflector 1 and a feed line 2 attached to the same is shown schematically.
  • the feed line 2 projects centrally through the reflector 1. It is bent so that one the free end of the exciter 3 with its opening is approximately in the focus of the reflector 1.
  • clamping elements 4 can be used, which are attached to the reflector 1.
  • the feed line 2 can be a waveguide or a coaxial cable. It is equipped at its connection end with a high-frequency flange 5 for connecting further lines.
  • a holding plate 7 is arranged in the opening 6, in which the feed line 2 is fixed, for example by brazing.
  • the holding plate 7 is preferably made of metal, such as aluminum or stainless steel.
  • a metal ring 8 is attached to the reflector 1, which surrounds the holding plate 7 all around.
  • pins 9 are attached, which extend in the radial direction and engage in at least one groove 10 of the holding plate 7 when the latter is mounted on the reflector 1.
  • pins 9 offset from one another by 120 °.
  • the holding plate 7 can be rotated in the opening 6 of the reflector 1 in the circumferential direction if any fastening elements and the clamping elements 4 are loosened.
  • the pins 9 protruding into the groove 10 prevent the holding plate 7 from tilting or tilting.
  • the groove 10 can be circumferential, so that the holding plate 7 could be rotated 360 ° in the reflector 1. If such complete rotation is not required, the groove 10 can, according to the 5 can also be divided into three separate sections which are offset by 120 ° from one another. These sections each lie in the area of a pin 9, so that, for example, the holding plate 7 can be rotated through an angle of 120 °. With a larger number of pins 9, the groove 10 could also be divided into more than three sections.
  • two grooves 10 and 11 can also be provided next to one another in the holding plate 7, as shown in FIG. 6. Even then, the grooves 10 and 11 can be divided into sections.
  • the pins 9 are to be arranged in the ring 8 in two planes.
  • the pins 9 are adjustable in the radial direction. For this purpose, they can be provided with a thread in their area lying in the ring 8. If the material of the holding plate 7 is sufficiently stable, the pins 9 can in principle also be used to fix the holding plate 7 if they are pressed sufficiently firmly against the bottom of the groove 10. For the rotation of the holding plate 7, the pins 9 would then have to be turned outward until they lift off the bottom of the groove 10.

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  • Aerials With Secondary Devices (AREA)

Description

Die Erfindung bezieht sich auf eine Antenne mit parabolischem Reflektor und mindestens einer Speiseleitung, an deren freiem Ende ein Erreger angebracht ist, bei welcher in einer zentralen Öffnung des Reflektors eine die als biegesteifes, rohrförmiges Bauteil aus Metall ausgeführte Speiseleitung umschließende, die Öffnung verschließende Halteplatte angebracht ist (US-PS 3,864,688).The invention relates to an antenna with a parabolic reflector and at least one feed line, at the free end of which an exciter is attached, in which in a central opening of the reflector a feed plate, which surrounds the opening as a rigid, tubular metal component and closes the opening, is attached is (U.S. Patent 3,864,688).

Antennen mit parabolischem Reflektor werden beispielsweise für Richtfunk, Satellitenfunk oder Funkortung verwendet. Sie können dabei zur direkten Ausleuchtung des Reflektors oder auch zur Ausleuchtung desselben über einen Subreflektor (Cassegrainprinzip) eingesetzt werden. "Ausleuchtung" soll dabei beide Übertragungsrichtungen der elektromagnetischen Wellen umfassen, also sowohl abzustrahlende als auch zu empfangende Wellen. Zur Ausleuchtung werden Erreger verwendet, die am freien Ende von mindestens einer Speiseleitung angeordnet sind. "Erreger" können beispielsweise Dipolerreger oder auch Polarisationsweichen sein, in denen zwei oder mehr elektromagnetische Wellen geführt werden können. "Erreger" kann aber auch das entsprechend geformte freie Ende einer Speiseleitung sein. Bei der Speiseleitung kann es sich um eine koaxiale Leitung oder um einen Hohlleiter handeln.Antennas with a parabolic reflector are used, for example, for directional radio, satellite radio or radio location. They can be used to illuminate the reflector directly or to illuminate it using a subreflector (Cassegrain principle). "Illumination" is intended to encompass both directions of transmission of the electromagnetic waves, that is to say both waves to be emitted and waves to be received. Exciters are used for illumination, which are arranged at the free end of at least one feed line. “Exciters” can be, for example, dipole exciters or also polarization switches in which two or more electromagnetic waves can be guided. "Exciter" can also be the appropriately shaped free end of a feed line. The feed line can be a coaxial line or a waveguide.

Bei der bekannten Antenne nach der eingangs erwähnten US-PS 3,864,688 sind als Speiseleitungen zwei rechteckige Hohlleiter mittels der Halteplatte in der Öffnung des Reflektors befestigt. Die Halteplatte weist dazu zwei hülsenförmig erweiterte Durchbrüche auf, von denen jede einen Hohlleiter aufnimmt. Einzelheiten über die Befestigung der Halteplatte am Reflektor sind der US-PS 3,864,688 nicht zu entnehmen. Zur Einstellung der optimalen Position des am Ende der Speiseleitungen angebrachten Erregers ist bei dieser bekannten Konstruktion ein relativ großer Aufwand zu treiben, da die Speiseleitungen mit Erreger dabei so gehalten werden müssen, daß die Halteplatte im Reflektor leicht gedreht werden kann, ohne dabei zu verkanten. Das gilt sowohl bei der Erstmontage des Erregers als auch bei einer späteren Änderung. Vielfach besteht der Wunsch, die Halteplatte im Reflektor um 360° drehen zu können.In the known antenna according to the above-mentioned US Pat. No. 3,864,688, two rectangular waveguides are fastened as feed lines by means of the holding plate in the opening of the reflector. For this purpose, the holding plate has two sleeve-shaped openings, each of which receives a waveguide. Details of the attachment of the holding plate to the reflector are not to be found in US Pat. No. 3,864,688. To set the optimal position of the exciter attached to the end of the feed lines, this known construction requires a relatively large amount of effort, since the feed lines with exciter must be held in such a way that the holding plate in the reflector can be rotated easily without tilting. This applies both to the first installation of the pathogen and to a later change. There is often a desire to be able to turn the holding plate in the reflector by 360 °.

Der Erfindung liegt die Aufgabe zugrunde, eine Antenne mit parabolischem Reflektor und einer in einer Halteplatte befestigten Speiseleitung mit Erreger anzugeben, die eine einfache Drehbarkeit der Halteplatte ohne Verkanten ermöglicht.The invention is based on the object of specifying an antenna with a parabolic reflector and a feed line with exciter fastened in a holding plate, which enables the holding plate to be easily rotated without tilting.

Diese Aufgabe wird bei einer Antenne der eingangs geschilderten Art gemäß der Erfindung dadurch gelöst,

  • daß am Reflektor ein die als Kreisscheibe ausgeführte Halteplatte rundum umschließender Ring befestigt ist,
  • daß in der Umfangsfläche der Halteplatte mindestens eine in Umfangsrichtung verlaufende Nut angebracht ist und
  • daß in dem Ring mindestens drei um 120° in Umfangsrichtung gegeneinander versetzte und in radialer Richtung verlaufende Stifte angeordnet sind, die in Montageposition der Halteplatte in die Nut eingreifen.
This object is achieved in an antenna of the type described at the outset according to the invention in that
  • that a ring surrounding the plate, which is designed as a circular disk, is attached to the reflector,
  • that at least one groove running in the circumferential direction is provided in the peripheral surface of the holding plate and
  • that in the ring at least three staggered by 120 ° in the circumferential direction and extending in the radial direction are arranged, which engage in the mounting position of the holding plate in the groove.

In Montageposition der Halteplatte ragen die Stifte in die Nut der Halteplatte hinein, so daß dieselbe in axialer Richtung festgelegt ist. Diese Position ist durch die Stifte so stabil, daß die im wesentlichen einseitig aus der Halteplatte herausragende Speiseleitung mit angeschlossenem Erreger die Halteplatte nicht kippen bzw. verkanten kann. Die Halteplatte ist daher nach Lösen von gegebenenfalls vorhandenen zusätzlichen Befestigungselementen leicht in Umfangsrichtung drehbar. Der Erreger kann dann ohne großen Aufwand in die für eine optimale Übertragung der elektromagnetischen Wellen benötigte Lage gedreht werden.In the mounting position of the holding plate, the pins protrude into the groove of the holding plate, so that the latter is fixed in the axial direction. This position is so stable by the pins that the feed line, which projects essentially from one side of the holding plate with the exciter connected, cannot tilt or tilt the holding plate. The retaining plate is therefore easily rotatable in the circumferential direction after loosening any additional fasteners that may be present. The exciter can then be turned into the position required for optimal transmission of the electromagnetic waves without great effort.

Vorteilhafte Ausgestaltungen der Erfindung gehen aus den Unteransprüchen hervor.Advantageous embodiments of the invention emerge from the subclaims.

Ausführungsbeispiele des Erfindungsgegenstandes sind in den Zeichnungen dargestellt.Embodiments of the subject matter of the invention are shown in the drawings.

Es zeigen:

  • Fig. 1 eine Antenne nach der Erfindung in schematischer Darstellung.
  • Fig. 2 einen Ausschnitt der Antenne in vergrößerter Darstellung.
  • Fig. 3 eine Draufsicht auf die Antenne nach Fig. 2 in Richtung des Pfeiles "A".
  • Fig. 4 die Befestigung der Halteplatte in weiter vergrößerter Darstellung.
  • Fig. 5 eine gegenüber Fig. 4 abgewandelte Ausführungsform.
  • Fig. 6 einen Querschnitt durch eine Halteplatte.
Show it:
  • Fig. 1 shows an antenna according to the invention in a schematic representation.
  • Fig. 2 shows a detail of the antenna in an enlarged view.
  • Fig. 3 is a plan view of the antenna of FIG. 2 in the direction of arrow "A".
  • Fig. 4 shows the attachment of the holding plate in a further enlarged view.
  • FIG. 5 shows an embodiment modified compared to FIG. 4.
  • Fig. 6 shows a cross section through a holding plate.

In Fig. 1 ist eine Antenne mit einem parabolischen Reflektor 1 und einer an demselben festgelegten Speiseleitung 2 schematisch dargestellt. Die Speiseleitung 2 ragt in diesem Fall zentral durch den Reflektor 1 hindurch. Sie ist so gebogen, daß ein an ihrem freien Ende befindlicher Erreger 3 mit seiner Öffnung etwa im Brennpunkt des Reflektors 1 liegt. Zur zusätzlichen Halterung der Speiseleitung 2 bzw. des Erregers 3 können Spannelemente 4 verwendet werden, die am Reflektor 1 befestigt sind. Es können beispielsweise vier jeweils um 90° versetzte Spannelemente 4 eingesetzt werden. Bei der Speiseleitung 2 kann es sich um einen Hohlleiter oder ein koaxiales Kabel handeln. Sie ist an ihrem Anschlußende mit einem Hochfrequenzflansch 5 zum Anschluß weiterführender Leitungen ausgerüstet.In Fig. 1, an antenna with a parabolic reflector 1 and a feed line 2 attached to the same is shown schematically. In this case, the feed line 2 projects centrally through the reflector 1. It is bent so that one the free end of the exciter 3 with its opening is approximately in the focus of the reflector 1. For additional mounting of the feed line 2 or the exciter 3, clamping elements 4 can be used, which are attached to the reflector 1. For example, four clamping elements 4, each offset by 90 °, can be used. The feed line 2 can be a waveguide or a coaxial cable. It is equipped at its connection end with a high-frequency flange 5 for connecting further lines.

Zur Durchführung der Speiseleitung 2 durch den Reflektor 1 weist derselbe eine zentrale Öffnung 6 auf. In der Öffnung 6 ist eine Halteplatte 7 angeordnet, in welcher die Speiseleitung 2 beispielsweise durch Hartlöten festgelegt ist. Die Halteplatte 7 besteht vorzugsweise aus Metall, wie beispielsweise Aluminium oder Edelstahl. Zu ihrer axialen Festlegung ist am Reflektor 1 ein aus Metall bestehender Ring 8 befestigt, der die Halteplatte 7 rundum umgibt. In dem Ring 8 sind Stifte 9 angebracht, die in radialer Richtung verlaufen und in mindestens eine Nut 10 der Halteplatte 7 eingreifen, wenn dieselbe am Reflektor 1 montiert ist. Es sind mindestens drei um 120° gegeneinander versetzte Stifte 9 vorhanden. Zur Festlegung der Halteplatte 7 am Reflektor 1 können weitere Befestigungselemente verwendet werden, die der Einfachheit halber nicht mit dargestellt sind.In order to lead the feed line 2 through the reflector 1, the latter has a central opening 6. A holding plate 7 is arranged in the opening 6, in which the feed line 2 is fixed, for example by brazing. The holding plate 7 is preferably made of metal, such as aluminum or stainless steel. For their axial fixing, a metal ring 8 is attached to the reflector 1, which surrounds the holding plate 7 all around. In the ring 8 pins 9 are attached, which extend in the radial direction and engage in at least one groove 10 of the holding plate 7 when the latter is mounted on the reflector 1. There are at least three pins 9 offset from one another by 120 °. To fix the holding plate 7 on the reflector 1, further fastening elements can be used, which are not shown for the sake of simplicity.

Die Halteplatte 7 kann in der Öffnung 6 des Reflektors 1 in Umfangsrichtung gedreht werden, wenn gegebenenfalls vorhandene Befestigungselemente und die Spannelemente 4 gelöst sind. Die in die Nut 10 hineinragenden Stifte 9 verhindern dabei, daß die Halteplatte 7 kippt oder verkantet. Die Nut 10 kann umlaufend ausgeführt sein, so daß die Halteplatte 7 um 360° im Reflektor 1 gedreht werden könnte. Wenn eine solche vollständige Drehung nicht erforderlich ist, kann die Nut 10, entsprechend der Darstellung in Fig. 5 auch in drei voneinander getrennte, um 120° gegeneinander versetzte Abschnitte unterteilt sein. Diese Abschnitte liegen jeweils im Bereich eines Stifts 9, so daß beispielsweise eine Drehung der Halteplatte 7 um einen Winkel von 120° möglich ist. Bei einer größeren Anzahl von Stiften 9 könnte die Nut 10 auch in mehr als drei Abschnitte unterteilt sein.The holding plate 7 can be rotated in the opening 6 of the reflector 1 in the circumferential direction if any fastening elements and the clamping elements 4 are loosened. The pins 9 protruding into the groove 10 prevent the holding plate 7 from tilting or tilting. The groove 10 can be circumferential, so that the holding plate 7 could be rotated 360 ° in the reflector 1. If such complete rotation is not required, the groove 10 can, according to the 5 can also be divided into three separate sections which are offset by 120 ° from one another. These sections each lie in the area of a pin 9, so that, for example, the holding plate 7 can be rotated through an angle of 120 °. With a larger number of pins 9, the groove 10 could also be divided into more than three sections.

Wenn die Halteplatte 7 in dem vom Ring 8 umschlossenen Bereich breit genug ausgeführt ist, können entsprechend der Darstellung in Fig. 6 auch zwei Nuten 10 und 11 nebeneinander in der Halteplatte 7 angebracht sein. Auch dann ist eine Unterteilung der Nuten 10 und 11 in Abschnitte möglich. Die Stifte 9 sind im Ring 8 entsprechend in zwei Ebenen anzuordnen.If the holding plate 7 is made wide enough in the area enclosed by the ring 8, two grooves 10 and 11 can also be provided next to one another in the holding plate 7, as shown in FIG. 6. Even then, the grooves 10 and 11 can be divided into sections. The pins 9 are to be arranged in the ring 8 in two planes.

Die Stifte 9 sind in radialer Richtung verstellbar. Dazu können sie in ihrem im Ring 8 liegenden Bereich mit einem Gewinde versehen sein. Wenn das Material der Halteplatte 7 ausreichend stabil ist, können die Stifte 9 grundsätzlich auch zur Festlegung der Halteplatte 7 mit ausgenutzt werden, wenn sie ausreichend fest an den Boden der Nut 10 angedrückt werden. Für die Drehung der Halteplatte 7 müßten die Stifte 9 dann zunächst so weit nach außen gedreht werden, bis sie vom Boden der Nut 10 abheben.The pins 9 are adjustable in the radial direction. For this purpose, they can be provided with a thread in their area lying in the ring 8. If the material of the holding plate 7 is sufficiently stable, the pins 9 can in principle also be used to fix the holding plate 7 if they are pressed sufficiently firmly against the bottom of the groove 10. For the rotation of the holding plate 7, the pins 9 would then have to be turned outward until they lift off the bottom of the groove 10.

Claims (3)

  1. Antenna with parabolic reflector (1) and at least one feed line (2), at the free end of which an exciter (3) is attached, in which a holding plate (7) enclosing the feed line (2) constructed as flexurally stiff tubular component of metal is attached in a central opening (6) of the reflector (1) and closes the opening (6), characterized in that
    - a ring (8) enclosing the holding plate (7), which is constructed as circular disk, all around is mounted on the reflector (1),
    - that at least one groove (10) extending in the circumferential direction is placed in the circumferential area of the holding plate (7), and
    - that in the ring (8), at least three pins (9) offset with respect to one another by 120° in the circumferential direction and extending in the radial direction are arranged which engage the groove (10) in the assembly position of the holding plate (7).
  2. Antenna according to Claim 1, characterized in that the groove (10) is constructed as peripheral groove.
  3. Antenna according to Claim 1 or 2, characterized in that pins (9) are arranged radially adjustably in the ring (8).
EP90108522A 1989-05-11 1990-05-07 Antenna with a parabolic reflector Expired - Lifetime EP0397070B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8905888U DE8905888U1 (en) 1989-05-11 1989-05-11 Antenna with parabolic reflector
DE8905888U 1989-05-11

Publications (3)

Publication Number Publication Date
EP0397070A2 EP0397070A2 (en) 1990-11-14
EP0397070A3 EP0397070A3 (en) 1991-08-07
EP0397070B1 true EP0397070B1 (en) 1994-07-13

Family

ID=6839127

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90108522A Expired - Lifetime EP0397070B1 (en) 1989-05-11 1990-05-07 Antenna with a parabolic reflector

Country Status (4)

Country Link
EP (1) EP0397070B1 (en)
DE (2) DE8905888U1 (en)
FI (1) FI902341A0 (en)
NO (1) NO175730C (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2672435B1 (en) * 1991-02-05 1993-11-19 Cgti DEVICE FOR MOUNTING AND DISASSEMBLING THE SOURCE OF AN ANTENNA.
DE9419493U1 (en) * 1994-12-06 1995-01-26 Kabelmetal Electro Gmbh, 30179 Hannover Antenna with parabolic reflector

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB897215A (en) * 1957-09-20 1962-05-23 Emi Ltd Improvements in or relating to radar apparatus
US3483564A (en) * 1966-10-17 1969-12-09 Diamond Antenna & Microwave Co Dish reflector with detachable waveguide feed
JPS6090404A (en) * 1983-10-24 1985-05-21 Maspro Denkoh Corp Parabolic antenna

Also Published As

Publication number Publication date
EP0397070A2 (en) 1990-11-14
NO902083D0 (en) 1990-05-10
NO902083L (en) 1990-11-12
DE59006398D1 (en) 1994-08-18
FI902341A0 (en) 1990-05-10
NO175730C (en) 1994-11-23
DE8905888U1 (en) 1989-06-29
EP0397070A3 (en) 1991-08-07
NO175730B (en) 1994-08-15

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