EP0523802A1 - Feedhorn - Google Patents

Feedhorn Download PDF

Info

Publication number
EP0523802A1
EP0523802A1 EP92202135A EP92202135A EP0523802A1 EP 0523802 A1 EP0523802 A1 EP 0523802A1 EP 92202135 A EP92202135 A EP 92202135A EP 92202135 A EP92202135 A EP 92202135A EP 0523802 A1 EP0523802 A1 EP 0523802A1
Authority
EP
European Patent Office
Prior art keywords
opening
feedhorn
protective cap
feed horn
film
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.)
Withdrawn
Application number
EP92202135A
Other languages
German (de)
English (en)
French (fr)
Inventor
Manfred Bodewig
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.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Patentverwaltung GmbH
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Patentverwaltung GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Patentverwaltung GmbH
Publication of EP0523802A1 publication Critical patent/EP0523802A1/de
Withdrawn legal-status Critical Current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
    • H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome

Definitions

  • the invention relates to a feed horn which has an opening which is covered by a protective cap and through which microwaves received by a transmitter are fed to a low-noise converter.
  • So-called low-noise converters are provided in satellite reception systems, which are used to convert the microwaves received from satellites in orbit into a lower frequency range, in which they can be processed more easily by subsequent circuit parts.
  • satellite reception systems usually have a parabolic antenna, which concentrates the received signals approximately at one point.
  • These already concentrated microwaves pass through a feed horn to a low-noise converter, which in turn is arranged in a housing.
  • the feedhorn is usually funnel-shaped and has an opening in its wider area through which the microwaves bundled by means of the parabolic antenna fall onto the low-noise converter arranged on the other side of the feedhorn. Both the low-noise converter and the feedhorn are sealed to the outside against weather influences.
  • the microwaves must be able to reach the low-noise converter through the wider opening of the feed horn. Therefore, this opening can only be covered by a protective cap, which should influence the microwaves as little as possible.
  • This protective cap which is also called radome, causes a more or less strong attenuation of the microwaves, depending on the choice of material. This damping in turn results in a worse useful signal / noise ratio.
  • the protective cap must be designed so that it is weatherproof and the feed horn is moisture-proof. This problem is exacerbated by the fact that, at certain positions of the sun, the parabolic antenna bundles the sun's radiation onto the cover cap of the feedhorn, so that it is exposed to very high temperature peaks that many plastics do not survive without damage.
  • a horn with a funnel-shaped opening part is known, in which a plate is inserted at a distance of about one eighth of the waveguide wavelength, which plate can consist, for example, of a glass fiber fabric that is stiffened with a silicone resin.
  • a horn antenna is known, over the opening of which a cover can be placed, the outer edge of which extends over the edge of the horn antenna.
  • This construction has the disadvantage that when the outer edge of the cover is folded around the outer edge of the horn antenna, a reliable weather-resistant cover is not always achieved, since the material of the cover easily wrinkles in this area.
  • the protective cap is provided with recesses in its outer edge region and which is provided from the outside by means of a retaining ring is set on the edge of the opening of the feedhorn.
  • the protective cap is not fastened to the edge of the opening of the feed horn by screwing, but is fixed to the edge of the opening of the feed horn by means of a retaining ring from the outside. Because screw connections are no longer required, very economical production is possible.
  • the protective cap is provided with circumferential recesses in its outer edge area, so that it can be fixed on the outer edge of the opening of the feed horn by means of the retaining ring without throwing waves or folds. Depending on the diameter and shape of the opening, the recesses should be selected so that the protective cap is placed around the edge of the opening of the feedhorn without wrinkling.
  • the cutouts are rectangular and form a tooth profile running around the outer edge of the film.
  • the protective cap can be flanged in the area of the recesses behind an edge running in the area of the opening of the feed horn.
  • a rubber seal is provided for the feedhorn and the protective cap.
  • the rubber seal is to be designed so that the film is pressed against the rubber seal in the state defined by the retaining ring. This creates a permanent seal between the feedhorn and the protective cap.
  • the protective cap is designed as a glass fabric film coated on both sides with Teflon.
  • PTFE Teflon
  • Such a film is mechanically extremely stable and also weatherproof. The film can easily cope with high temperatures caused by solar radiation. It also has a low attenuation of the microwaves passing through it.
  • a feed horn 1 shown in section in FIG. 1 is provided for a satellite reception system, not shown in the drawing.
  • the not shown Satellite receiving system can in particular have a satellite antenna which bundles microwaves received from a satellite.
  • the microwaves bundled in this way are thrown onto a wide opening 2 of the feed horn 1 shown in FIG. 1.
  • the microwaves subsequently pass through the feed horn 1 to a low-noise converter, also not shown in the figure.
  • the feedhorn 1 is essentially hollow.
  • the relatively wide opening 2 must be protected against the weather by means of a protective cap 3.
  • This protective cap is intended on the one hand to keep weather influences away from the inside of the feed horn, but on the other hand to dampen the microwaves falling through the opening 2 as little as possible.
  • a glass fabric film 3 coated on both sides with Teflon is now provided as a protective cap, which fulfills the above requirements.
  • the glass fabric film 3 coated with Teflon is fixed in the outer edge region of the opening 2 of the feed horn 1 by means of a retaining ring on the edge of the opening 2 of the feed horn 1.
  • FIG. 2 shows an enlarged representation of a part of the edge region of the opening 2 of the feed horn 1 according to FIG. 1.
  • the protective cap designed as a glass fabric film coated with Teflon has a glass fabric film 4 in its interior, which is provided on both sides with a Teflon layer 5.
  • the illustration according to FIG. 2 shows a rubber seal 10 which is arranged between the feed horn 1 and the glass fabric film 3 coated with Teflon.
  • the Glass fabric film 3 placed around the outer edge of the widened opening 2 of the feed horn 1. It is fixed in this area by means of a retaining ring 6 on the edge of the opening of the feed horn 1. It is flanged in its outer area behind an edge 7, which is provided in the area of the widened opening 2 of the feed horn 1.
  • the film In order to prevent the glass fabric film 3 coated with Teflon from wrinkling when folded around the outer edge area of the opening 2 or when flanging behind the edge 7 of the feed horn 1, the film is provided with cutouts in its outer edge area.
  • FIG. 3 shows the glass fabric film according to FIGS. 1 and 2 in the state not yet mounted on the opening 2 of the feed horn 1.
  • the film 3 Since the opening 2 of the feed horn 1 is round, the film 3 also has a circular shape. In its outer region, the film 3 is provided with cutouts 8, which are arranged in a rectangular shape, so that tooth-shaped tabs 9 are formed between the cutouts 8. So there is a circumferential tooth profile through the recess 8 on the outer edge of the film 3.
  • the recesses 8 or the tooth profile produced by them enable the film 3 to be folded around the edge region of the opening 2 of the feed horn 1 without any folds or waves occurring during this folding of the film. Even when flanging around the edge 7 of the feed horn 1 according to FIG. 2, such fold formation is prevented by the cutouts 8. In this way screw fasteners can be omitted.

Landscapes

  • Waveguide Aerials (AREA)
  • Details Of Aerials (AREA)
EP92202135A 1991-07-19 1992-07-13 Feedhorn Withdrawn EP0523802A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4124011 1991-07-19
DE4124011A DE4124011C1 (https=) 1991-07-19 1991-07-19

Publications (1)

Publication Number Publication Date
EP0523802A1 true EP0523802A1 (de) 1993-01-20

Family

ID=6436576

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92202135A Withdrawn EP0523802A1 (de) 1991-07-19 1992-07-13 Feedhorn

Country Status (3)

Country Link
EP (1) EP0523802A1 (https=)
JP (1) JPH05218727A (https=)
DE (1) DE4124011C1 (https=)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2458663B (en) * 2008-03-26 2012-11-21 Thales Holdings Uk Plc Radome

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4235266C1 (de) * 1992-10-20 1993-10-21 Bodenseewerk Geraetetech Verbindungsanordnung zum Verbinden eines einen Suchkopf abdeckenden Domes mit der Struktur eines Flugkörpers
DE20115306U1 (de) 2001-09-17 2002-01-24 Sosna, Hans-Georg, 83661 Lenggries Abdeckblende für Satellitenschüsseln und/oder Parabolempfänger
JP3920111B2 (ja) * 2002-02-15 2007-05-30 シャープ株式会社 電波受信用コンバータおよびアンテナ装置
JP2010147886A (ja) * 2008-12-19 2010-07-01 Nec Corp 副反射鏡、電波給電部及びパラボラアンテナ

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2222952A1 (de) * 1972-02-21 1973-11-22 Siemens Ag Druckdichte, wetterfeste, dielektrische abdichtscheibe fuer einen hohlleiterstrahler
US3781898A (en) * 1972-07-03 1973-12-25 A Holloway Spiral antenna with dielectric cover
EP0322498A2 (en) * 1987-12-02 1989-07-05 Masprodenkoh Kabushikikaisha Primary radiator for parabolic antenna

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1185669B (de) * 1958-09-17 1965-01-21 Siemens Ag Richtantenne fuer sehr kurze elektromagnetische Wellen
JPS60134602A (ja) * 1983-12-23 1985-07-17 Mitsubishi Electric Corp ホ−ンアンテナ

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2222952A1 (de) * 1972-02-21 1973-11-22 Siemens Ag Druckdichte, wetterfeste, dielektrische abdichtscheibe fuer einen hohlleiterstrahler
US3781898A (en) * 1972-07-03 1973-12-25 A Holloway Spiral antenna with dielectric cover
EP0322498A2 (en) * 1987-12-02 1989-07-05 Masprodenkoh Kabushikikaisha Primary radiator for parabolic antenna

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2458663B (en) * 2008-03-26 2012-11-21 Thales Holdings Uk Plc Radome

Also Published As

Publication number Publication date
DE4124011C1 (https=) 1992-10-01
JPH05218727A (ja) 1993-08-27

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