EP0108515B1 - Antenne à miroir parabolique - Google Patents

Antenne à miroir parabolique Download PDF

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Publication number
EP0108515B1
EP0108515B1 EP83306128A EP83306128A EP0108515B1 EP 0108515 B1 EP0108515 B1 EP 0108515B1 EP 83306128 A EP83306128 A EP 83306128A EP 83306128 A EP83306128 A EP 83306128A EP 0108515 B1 EP0108515 B1 EP 0108515B1
Authority
EP
European Patent Office
Prior art keywords
dish
aerial
reflecting surface
housing
moulded
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
Application number
EP83306128A
Other languages
German (de)
English (en)
Other versions
EP0108515A1 (fr
Inventor
Russel John Eberhardt
John Ernest Reginald Houchin
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.)
Cambridge Electronic Industries PLC
Original Assignee
Cambridge Electronic Industries PLC
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
Application filed by Cambridge Electronic Industries PLC filed Critical Cambridge Electronic Industries PLC
Publication of EP0108515A1 publication Critical patent/EP0108515A1/fr
Application granted granted Critical
Publication of EP0108515B1 publication Critical patent/EP0108515B1/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • H01Q19/18—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 having two or more spaced reflecting surfaces
    • H01Q19/19—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 having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface

Definitions

  • This invention relates to dish aerials, for example, for the reception of satellite broadcast signals, or othr electro-magnetic radiation, although it may also be useful for transmitting signals.
  • One object of the present invention is to provide a design of a dish aerial including primary and secondary reflecting components enabling it - or a substantial part of it - to be moulded from a structural plastics material, and without there being the need for fine adjustment of the reflecting components of the aerial in relation to each other.
  • Another object of the invention is to provide an aerial design enabling the signal receiving electronic components to be positioned in a region which can be protected from the weather.
  • a dish aerial includes a dish having a primary reflecting surface, a component having a secondary reflecting surface held located to receive signals reflected from the primary reflecting surface by a ring of circumferentially spaced struts, and a housing disposed around the principal axis of the dish for accommodating electronic equipment to receive signals reflected from the secondary reflecting surface.
  • the dish, struts, and housing are integrally moulded from plastics material.
  • the secondary component may also be moulded from plastics material, but there are applications in which it is desirable to have alternative secondary components with different radii of curvature and then it may be easiest to form them from sheet metal.
  • the housing disposed around the principal axis of the disc enables the first stage of the receiving chain to be at the or near the focus for received radiation, while yet being protected in the housing from the weather.
  • the housing is conveniently defined by a moulded cylindrical wall, integral with the moulded dish and the space within it can be closed off at one end by a mounting plate for the electronic equipment, and at the other end by a thin sheet of signal-transparent insulating material.
  • the housing wall or tube is preferably positioned at least partly behind the dish.
  • Grunzweig also refers to prior art consisting of a main reflector, electronic equipment mounted at the back of the main reflector, and an auxiliary reflector supported by struts from the edge of the main reflector. However, he does not suggest that those struts should be in an integral moulding with the main reflector and a housing for the electronic equipment.
  • Kathrein's German specification DE-A-1918084 also discloses a receiver having primary and secondary reflecting surfaces, but say anything about how they are formed, or how one is mounted in relation to the other.
  • the aerial includes a primary dish element 10 moulded from a thermoplastics structural foam comprising a low density cellular core enclosed within a solid integral skin.
  • Thermoplastics structural foams are described in two papers in Materials in Engineering, Volume 3, at page 354, and 443 by P. R. Hornsby and many of the materials described in those papers can be used in dependence upon the application.
  • the plastics material is polypropylene with glass fibre reinforcing filler.
  • the dish element 10 has a parabolic cross section with a central opening leading to a space for electronic equipment to be described later.
  • a secondary reflecting surface is defined by another element 30 pressed from sheet metal with a hyperbolic reflecting surface and that is held located in relation to the primary dish element by a circumferential ring of struts 11 disposed around the periphery of the secondary element 30 and the opening in the primary element 10.
  • the struts 11 are moulded integrally with the primary dish element 10 and engage in and are fixed in slots 13 in the edge of the secondary element 30.
  • the primary and secondary reflecting elements are held in fixed relative positional relationship by the struts so that parallel radiation indicated generally at 14 in Figure 1, is reflected first to the secondary element 30, and then to a secondary focus 15 on the axis 12 within a space 16 defined at the rear of the primary dish element 10 by an integrally moulded rearwardly extending cylindrical housing 17.
  • the reflecting surfaces of the primary and secondary elements 10 and 30, if the latter is moulded integrally, are metallised or bear metal foil, and this may be on the front surface or the rear surface of the wall defining the element.
  • the advantage of having the metallised layer on the first surface- encountered by the radiation is that the radiation is not refracted and does not have any loss due to having to traverse the thickness of the element twice at each reflecting surface.
  • the advantage of having the metallised surface at the rear is that the metallised surface is not exposed to the atmosphere but is protected by the material of the element. The particular application will probably determine which system is used.
  • the secondary element is a metal pressing the convex face can be polished to define the reflecting surface.
  • the space 16 houses a wave guide horn 18 and an amplifier and down converter 19, mounted on a plate 21 held in position by bolts (not shown) in rod-like protuberances 22 surrounding the sleeve 17.
  • An external coaxial cable 23 takes the signal from the converter 19 to remote signal processing equipment, and may be used to bring power to the amplifier and down converter.
  • the wave guide horn 18 is mounted at the focus 15 of radiation from the secondary element 30.
  • the rear of the space is closed off by the plate 21, and the front can also be closed off by a plate at 24, or even a sheet of plastics material so that the space 16 is protected from dirt and moisture from the atmosphere.
  • the diameter of the primary dish 10 is about one metre, and the average wall thickness of the moulded components is about 6mm.

Landscapes

  • Aerials With Secondary Devices (AREA)
  • Waveguide Aerials (AREA)

Claims (7)

1. Une antenne parabolique comprenant une parabole (10) possédant une surface réfléchissante primaire, un composant (30) possédant une surface réfléchissante secondaire maintenu en position pour recevoir des signaux réfléchis à partir de la surface réfléchissante primaire par un anneau de tiges (11) espacées circonférentielle- ment, et un boîtier (17) disposé autour de l'axe principal (12) de la parabole pour loger un équipement électronique (19) recevant des signaux, caractérisé en ce que la parabole (10), les tiges (11) et le boîtier (17) sont moulés en un moulage unique d'un seul tenant en matière plastique.
2. Une antenne selon la revendication 1 dans laquelle des moyens de fermeture (21, 24) protègent de l'environnement l'intérieur du boîtier.
3. Une antenne selon l'une quelconque des précédentes revendications comprenant des moyens de montage (26) pour la parabole moulés d'un seul tenant à l'arrière de la parabole.
4. Une antenne selon l'une quelconque des précédentes revendications dans laquelle la surface réflechissante secondaire est située sur un composant (30) qui est attaché aux moyens moyens de maintien (11) de façon démontable.
5. Une antenne selon l'une quelconque des revendications 1 à 3, dans laquelle la seconde surface réfléchissante est située sur un composant (30) qui est moulé d'un seul tenant avec les moyens de maintien, la parabole, et le boîtier.
6. Une antenne selon l'une quelconque des précédentes revendications dans laquelle la matière plastique prend la forme d'une mousse structurelle thermoplastique comprenant un noyau cellulaire de faible densité enfermé à l'intérieur d'une peau massive d'un seul tenant, et contenant éventuellement un matériau de charge de renforcement.
7. Une antenne selon l'une quelconque des précédentes revendications dans laquelle l'une des surfaces réfléchissantes ou chacune d'elles est définie par une couche métallique sur une surface en plastique moulé.
EP83306128A 1982-10-11 1983-10-10 Antenne à miroir parabolique Expired EP0108515B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8229030 1982-10-11
GB8229030 1982-10-11

Publications (2)

Publication Number Publication Date
EP0108515A1 EP0108515A1 (fr) 1984-05-16
EP0108515B1 true EP0108515B1 (fr) 1989-05-31

Family

ID=10533531

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83306128A Expired EP0108515B1 (fr) 1982-10-11 1983-10-10 Antenne à miroir parabolique

Country Status (2)

Country Link
EP (1) EP0108515B1 (fr)
DE (1) DE3380008D1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2165998B (en) * 1984-02-09 1988-02-17 Gen Electric Plc A dual reflector antenna
EP0170726A1 (fr) * 1984-07-13 1986-02-12 Siemens Aktiengesellschaft Antenne directionnelle à double réflecteur
EP0196734A3 (fr) * 1985-03-28 1988-08-03 Satellite Technology Services, Inc. Antenne Cassegrain pour réception de télévision
AU627493B2 (en) * 1988-09-23 1992-08-27 Alcatel N.V. A circularly symmetrical reflector

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1384677A (en) * 1972-08-19 1975-02-19 Gruenzweig & Hartmann Reflecting antenna primaryl for the ghz bands

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1918084B2 (de) * 1969-04-09 1972-09-07 Anton Kathrein, Älteste Spezialfabrik für Antennen und Blitzschutzapparate, 8200 Rosenheim Empfnagssystem fuer hohe frequenzen mit einer parabolantenne, einem frequenzumsetzer und einer koaxialleitung
EP0084420A3 (fr) * 1982-01-19 1983-08-03 P.A. Consulting Services Limited Antenne, en particulier pour la réception de satellite de télécommunications

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1384677A (en) * 1972-08-19 1975-02-19 Gruenzweig & Hartmann Reflecting antenna primaryl for the ghz bands

Also Published As

Publication number Publication date
DE3380008D1 (en) 1989-07-06
EP0108515A1 (fr) 1984-05-16

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