EP0192048B1 - Antenne à réflecteur comportant des tirants dans le champ de rayonnement - Google Patents

Antenne à réflecteur comportant des tirants dans le champ de rayonnement Download PDF

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Publication number
EP0192048B1
EP0192048B1 EP86100586A EP86100586A EP0192048B1 EP 0192048 B1 EP0192048 B1 EP 0192048B1 EP 86100586 A EP86100586 A EP 86100586A EP 86100586 A EP86100586 A EP 86100586A EP 0192048 B1 EP0192048 B1 EP 0192048B1
Authority
EP
European Patent Office
Prior art keywords
struts
supporting part
strut
case
reflector
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
EP86100586A
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German (de)
English (en)
Other versions
EP0192048A1 (fr
Inventor
Gerhard Dipl.-Ing. Schindler
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.)
Siemens AG
Original Assignee
Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to AT86100586T priority Critical patent/ATE51471T1/de
Publication of EP0192048A1 publication Critical patent/EP0192048A1/fr
Application granted granted Critical
Publication of EP0192048B1 publication Critical patent/EP0192048B1/fr
Anticipated expiration legal-status Critical
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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
    • H01Q19/02—Details
    • H01Q19/021—Means for reducing undesirable effects
    • H01Q19/023—Means for reducing undesirable effects for reducing the scattering of mounting structures, e.g. of the struts

Definitions

  • the invention relates to an antenna having a parabolic or approximately parabolic-shaped reflector with supports located in the beam path and serving to hold a primary radiator or an auxiliary reflector, each of which is curved in a plane determined by its two end points and the reflector axis (support plane) .
  • parabolic reflector antennas with a rotationally symmetrical design are often used, the exciters or auxiliary reflectors of which are supported by supports. These supports lie in the beam path of the emitted or received waves, so that they generate a secondary radiation which, in addition to a reduction in profits, results in rather high side lobes in certain angular ranges of the antenna pattern. In the case of directional and satellite radio connections, these secondary peaks interfere with neighboring radio links and must therefore be kept low.
  • the height and distribution of the side lobes in the radiation diagram of Cassegrain antennas, as they are primarily used in a rotationally symmetrical design for earth radio stations for satellite radio service, are significantly influenced by the scattered radiation from the support device of the catch reflector.
  • a special configuration of the support structure makes it possible to reduce this scattered radiation or to divert it into angular ranges that are not so critical with regard to compliance with the side lobe specification.
  • the resulting radiation distribution results from the superposition of the partial field coming from the main reflector and from the column arrangement originating. It is assumed that there is no interaction between the main reflector and the supports, i.e. the effect of the part of the column radiation that detects the main reflector is negligible. Although this is approximately permissible in the case of flat-shaped main reflectors, it can be assumed in the case of relatively deep reflectors that a substantial part of the column scattering radiation hits the main reflector again and changes the surface currents there. Because of the strong interaction between the two radiation sources, there is a limit to this physical view.
  • a parabolic reflector antenna which has arcuately curved supports for holding a primary radiator or a catch reflector in a Cassegrain antenna.
  • Such an arch-shaped column design also allows the linear phase profile to be changed such that the radiation scattered in the direction of reflection and laterally scattered is divided into a larger angular range.
  • straight-running supports are known from GB patent application 20 81 023, which have irregularly sawtooth-shaped sheets in the support plane, which also bring about an improvement in the scattered radiation behavior.
  • the object of the invention is to provide a support design for a reflector having a parabolic or approximately parabolic design, in particular for Cassegrain antennas with a deeply designed main reflector, which has an even more favorable scattering behavior with a simple technical construction possibility.
  • the reflection surfaces of the supports are each provided with a scattering structure, the height dimension of which is constant over the entire longitudinal course of the supports, while being perpendicular to the support plane regular wavy or meandering course, that the scattering structures are each mounted on a supporting part of the supports, that the supporting part of the supports each has an approximately rectangular cross-section, that the scattering structures on the inner, the reflecting surfaces of the supports forming the supporting surfaces Parts are attached and cover that the scattering structures either consist of two elongated Sheet metal parts or made of prefabricated molding material, which in the case of using the sheet metal parts enclose a space of approximately triangular cross section towards the supporting part of the support and are connected to one another at the edge facing away from the supporting part of the support, so that there is one for both sheets jointly tapering, sharp and wavy edge with a constant vertical distance from the supporting part of the support, and in the case of the use of molding material this has an approximately triangular
  • the regularity of the scattering structure according to the invention offers besides the electrical advantage, i.e. the better scattered radiation behavior, also the mechanical advantage that it can be broken down into many identical substructures.
  • the scattering structures designed according to the invention can be made of electrically conductive material, e.g. Metal, exist, but can also be realized by dielectric material.
  • FIG. 1 shows a schematic side view of a reflector antenna constructed according to the Cassegrain principle, as is often used for example in satellite radio technology. It is a rotationally symmetrical double mirror antenna. It has a primary radiator 10 designed as a groove homing, the phase center of which lies at the focal point of a shaped collecting reflector 9. The radiation emanating from the primary radiator 10 is deflected at the catch reflector 9 and reflected onto a main reflector 8 which is approximately in the form of a paraboloid of revolution, from which the radiation into the free space takes place. The catch reflector 9 is held on the main reflector 8 by means of a four-leg made of arcuately curved supports 1.
  • the supports 1 lie in the radiation field of the main reflector 8, which has an F / D ratio of approximately 0.25. At the supports 1 which are curved in the support plane, the plane wave emanating from the main reflector 8 excites secondary radiation, which results in an increase in the side lobes in the directional characteristic of the reflector antenna. In order to reduce the scattered radiation generated by the supports 1 or to divert them into angular ranges which are not critical with regard to compliance with the side lobe specification, scatter structures 2 are attached to the supports 1, the structure of which is explained below with reference to FIGS. 2 and 3.
  • the support 1 consists of an approximately rectangular supporting part 3 and of a scattering structure 2 made of electrically conductive or dielectric material attached to the reflection surface 4 of the part 3.
  • the dimension of the scattering structure 2 in the column plane i.e. that plane which is given by the two support end points and the main reflector axis of symmetry is constant over the entire longitudinal course of the support 1.
  • the scattering structures 2 have a regular undulating course perpendicular to the column plane.
  • the scattering structure 2 covering the reflection surface 4 of the supporting part 3 of the support 1 consists e.g.
  • the scattering structure 2 can also consist of a solid dielectric material which has the same outer shape as the two sheets 5 and 6 and is fastened on the supporting part 3 of the support 1.

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  • Aerials With Secondary Devices (AREA)

Claims (5)

1. Antenne à réflecteur parabolique, comportant un réflecteur (8) de forme parabolique ou approximativement parabolique et équipée de supports (1), qui sont situés dans le trajet du rayonnement, servant à supporter un émetteur primaire ou un réflecteur auxiliaire (9) et sont respectivement cintrés en forme d'arc dans un plan (plan de support) déterminé par leurs deux extrémités et l'axe du réflecteur, caractérisée par le fait que les surfaces réfléchissantes (4) des supports (1) sont pourvues chacune d'une structure dispersive (2), dont la hauteur est constante sur toute l'étendue en longueur des supports, alors que cette structure possède, perpendiculairement au plan de support, une forme régulière ondulée ou sinueuse, que les structures dispersives sont disposées respectivement sur une partie portante (3) des supports, que la partie portante des supports possède respectivement une section transversale de forme approximativement rectangulaire, que les structures dispersives sont disposées respectivement sur les surfaces intérieures (4), constituant les surfaces réfléchissantes des supports, des parties portantes et recouvrent ces surfaces, que les structures dispersives sont soit constituées respectivement par deux éléments de tôle allongés (5, 6), soit réalisées respectivement en un matériau moulable préfabriqué, auquel cas, lors de l'utilisation des éléments en tôle, ces derniers délimitent avec la partie portante des supports un espace possédant une section transversale approximativement triangulaire et sont reliés entre eux au niveau du bord situé à l'opposé de la partie portante des supports, de sorte que l'on obtient en cet endroit une arête vive de forme ondulée (7), formée conjointement par les deux tôles et séparée de la partie portante du support par une distance perpendiculaire constante, et, dans le cas de l'utilisation du matériau moulable, ce dernier possède une section transversale approximativement triangulaire et comporte, sur le côté tourné à l'opposé de la partie portante (3) du support (1), une arête vive de forme ondulée, de la partie portante du support séparée par une distance perpendiculaire constante.
2. Antenne suivant la revendication 1, caractérisée par le fait que les structures dispersives (2) sont réalisées en un matériau électriquement conducteur.
3. Antenne suivant la revendication 1, caractérisée en ce que les structures dispersives (2) sont réalisées en un matériau diélectrique.
4. Antenne suivant l'une des revendications précédentes, caractérisée en ce que les structures dispersives (2) sont formées respectivement par la réunion de plusieurs structures partielles identiques.
5. Antenne suivant l'une des revendications précédentes, caractérisée par l'utilisation d'une antenne Cassegrain possédant un réflecteur principal (8) profond, sur lequel sont montés les supports (1) servant à supporter le réflecteur secondaire (9).
EP86100586A 1985-01-21 1986-01-17 Antenne à réflecteur comportant des tirants dans le champ de rayonnement Expired - Lifetime EP0192048B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86100586T ATE51471T1 (de) 1985-01-21 1986-01-17 Reflektorantenne mit stuetzen im strahlengang.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3501825 1985-01-21
DE3501825 1985-01-21

Publications (2)

Publication Number Publication Date
EP0192048A1 EP0192048A1 (fr) 1986-08-27
EP0192048B1 true EP0192048B1 (fr) 1990-03-28

Family

ID=6260326

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86100586A Expired - Lifetime EP0192048B1 (fr) 1985-01-21 1986-01-17 Antenne à réflecteur comportant des tirants dans le champ de rayonnement

Country Status (3)

Country Link
EP (1) EP0192048B1 (fr)
AT (1) ATE51471T1 (fr)
DE (1) DE3669958D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2267839C1 (ru) * 2004-06-28 2006-01-10 Александр Иванович Шалякин Зеркальная антенна

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2493020B1 (fr) * 2009-10-21 2018-03-07 Mitsubishi Electric Corporation Dispositif d'antenne
FR2968848A1 (fr) * 2010-12-14 2012-06-15 Alcatel Lucent Antenne a reflecteur parabolique
RU2464677C1 (ru) * 2011-09-27 2012-10-20 Константин Павлович Харченко Способ генерации поверхностного электромагнитного процесса на коническом антенном элементе
RU2464678C1 (ru) * 2011-10-27 2012-10-20 Константин Павлович Харченко Способ достижения сверхширокополосности антенн линейной поляризации

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2081023B (en) * 1980-06-03 1985-05-22 Mitsubishi Electric Corp Reflector antenna
DE3047964A1 (de) * 1980-12-19 1982-07-29 Deutsche Bundespost, vertreten durch den Präsidenten des Fernmeldetechnischen Zentralamtes, 6100 Darmstadt "spiegelantenne mit sekundaerstrahlung erzeugenden stuetzen im strahlengang"
DE3100855A1 (de) * 1981-01-14 1982-08-05 Deutsche Bundespost, vertreten durch den Präsidenten des Fernmeldetechnischen Zentralamtes, 6100 Darmstadt "spiegelantenne mit sekundaerstrahlung erzeugenden stuetzen im strahlengang"
DE3307548A1 (de) * 1983-03-03 1984-09-06 Deutsche Bundespost, vertreten durch den Präsidenten des Fernmeldetechnischen Zentralamtes, 6100 Darmstadt Spiegelantenne mit sekundaerstrahlung erzeugenden stuetzen im strahlengang

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2267839C1 (ru) * 2004-06-28 2006-01-10 Александр Иванович Шалякин Зеркальная антенна

Also Published As

Publication number Publication date
EP0192048A1 (fr) 1986-08-27
ATE51471T1 (de) 1990-04-15
DE3669958D1 (de) 1990-05-03

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