WO2000049681A1 - Parabolic antenna - Google Patents
Parabolic antenna Download PDFInfo
- Publication number
- WO2000049681A1 WO2000049681A1 PCT/DE2000/000458 DE0000458W WO0049681A1 WO 2000049681 A1 WO2000049681 A1 WO 2000049681A1 DE 0000458 W DE0000458 W DE 0000458W WO 0049681 A1 WO0049681 A1 WO 0049681A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- film
- reflector
- parabolic antenna
- antenna according
- edge
- Prior art date
Links
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
- H01Q19/12—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
- H01Q19/132—Horn reflector antennas; Off-set feeding
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/44—Details of, or arrangements associated with, antennas using equipment having another main function to serve additionally as an antenna, e.g. means for giving an antenna an aesthetic aspect
Definitions
- the invention relates to a parabolic antenna for receiving and transmitting electromagnetic waves, in particular for receiving radio and television programs, which are transmitted by satellites, with a shell-shaped reflector circumscribing an opening.
- Parabolic antennas for receiving radio and television programs have been known and used for years. They are also used to send or receive other electromagnetic waves. Depending on their orientation towards a certain satellite, they enable the
- parabolic antennas have led to the fact that, especially in larger residential complexes, each individual residential unit has its own parabolic antenna, which can be mounted on building icons or directly on the house walls. This often leads to considerable visual impairments, since most parabolic antennas have a uniform gray or have a white base color.
- parabolic antennas have a uniform gray or have a white base color.
- There are some companies on the market that offer the painting of the parabolic antennas with individual motifs but this is relatively expensive and also a unique, irreversible process.
- parabolic antennas offer series of motif-printed or painted parabolic antennas to promote sales. However, the selection of motifs is very limited and cannot be changed afterwards.
- the invention is based on the problem of designing a parabolic antenna in such a way that the optical appearance of the parabolic antenna can be improved in a simple and inexpensive manner while maintaining the reception properties of the parabolic antenna, and the appearance can be changed at any time - is on loan.
- the problem is solved in that a film is applied to the reflector, the film covers the opening of the reflector in a tendon-like manner at least in sections, the film is attached to the parabolic antenna, the film is transparent to electromagnetic waves in the frequency range of 3 - 30 GHz.
- the main idea is to cover the opening of the reflector of a parabolic antenna with a film.
- the film is attached to the parabolic antenna so that it opens in the manner of a Tendon spanned.
- the manner in which the film is attached to the parabolic antenna is irrelevant according to the invention. As is suggested below by way of example, it can be carried out in a wide variety of ways.
- the most important property of the film must be the transparency for electromagnetic waves in the frequency range from 3 to 30 GHz, since otherwise the reception of the signals emitted by the satellites that lie in this frequency range would be impeded.
- the reflector can either be completely covered by the film, or, as described below, there are cutouts on the edge of the film.
- the film can also have a geometric shape, such as a triangle
- the film only partially covers the opening of the reflector.
- the advantages of the invention consist primarily in the fact that the opening of the reflector can be covered with a film in a very cost-effective manner. Furthermore, the teaching given is a reversible process, ie the foils can be removed again or exchanged for other foils.
- the film prevents raindrops or snowflakes from directly reaching the surface of the reflector and reducing the reception or transmission quality due to reflections or deflections of the electromagnetic waves.
- the water drops possibly adhering to the film also deflect the electromagnetic waves, because of their short wavelength, in comparison to the dimensions of the reflector, this deflection only acts as a slight attenuation of the signal, since the deflected waves overlap again to form a flat wavefront.
- the parabolic antenna must be designed in such a way that the holders of the detector are not attached directly to the edge of the reflector, but, for. B. on its back.
- the interior of the reflector can also be hermetically sealed, i.e. waterproof, be closed, e.g. B. with a circumferential gluing of the film to the reflector.
- parabolic antennas in which the detector holder is mounted directly on the edge of the opening of the reflector. So that the film can still cover the opening of the reflector with a precise fit, it is shaped in such a way that, depending on the number of detector holders, it has corresponding cutouts on the edge. These recesses are adapted to the respective parabolic antennas and allow the detector holder to be reached through.
- the film does not necessarily hermetically seal the interior of the reflector, this is also not required according to the invention, the penetration of Rain or melt water or the formation of condensation water in the interior of the reflector is quite possible. This water could collect in the lower area of the bowl-like reflector. DA by the reception quality would be significantly reduced because water or water droplets absorb the electro-magnetic waves mA or deflect an d accordingly, they do not longer in the direction of the detector would be reflected. To prevent this, the film is provided with a slot in the lower region, which is arranged at the edge of the opening of the reflector, and allows liquid to flow out of the reflector opening.
- a preferred embodiment of the film is that it overlaps the reflector, i. H. that it has a larger area than the opening of the reflector.
- the advantages of a film made of plastic are its low cost, ease of manufacture and processing and its durability. With a suitable choice of plastic material and appropriate packaging, it is very weatherproof, ie insensitive to weather influences, and can have a lifespan of several years. Furthermore, with a suitable design, it fulfills the requirement for transparency for electromagnetic waves, since this is due to the Plastic film is practically neither dampened nor absorbed.
- the film can also be designed to be abrasion-resistant, ie resistant to mechanical influences.
- a preferred material for a plastic film will be polyvinyl chloride, which has long been well known in the processing, manufacture and use in various configurations.
- polyvinyl chloride with additives will be used.
- B. contains plasticizers that increase the elasticity of the film. Stabilizers and / or UV absorbers will also be preferred additives. The stabilizers increase the resistance to weather influences and the UV absorbers prevent the plastic from being decomposed by the UV radiation in sunlight.
- hydrophobic additives reduces the formation of droplets and / or frost on the film. This causes water droplets to roll off, which means that the reception properties of the parabolic antenna are not reduced even when it rains. It is also conceivable to add color pigments to the polyvinyl chloride, as a result of which the films can be designed in a simple manner, the films themselves being always transparent to the electromagnetic waves.
- the plastic films In order to increase the service life of the plastic films, they can be designed as fabric films, ie the plastic films contain a core made of a fabric. In this way, any tear that may have arisen with the help of the fabric thread, ie mostly after just a few millimeters, stopped.
- the incorporated fabric thread prevents the film material from tearing, so that large-scale destruction of the entire film surface is prevented.
- the attachment of eyelets in the film opens up a large number of fastening options for the film on the parabolic antenna, as is shown below by way of example.
- the eyelets are stamped on the edge of a film overlapping the reflector and are usually arranged in such a way that they are distributed equidistantly over the circumference of the film. If the film only partially covers the opening of the reflector, the eyelets can be attached to the edge areas, e.g. B. with a star-shaped film at the tips of the "rays" of the star.
- the eyelets are provided with a hole reinforcement made of plastic. It improves the durability of the film because it prevents the eyelets from tearing under tensile stress.
- the edge of the film can also be provided with a reinforcement, preferably made of plastic. Damage to the film in the edge area is thus counteracted.
- One way of attaching the film to the parabolic antenna is to fix a film that is equipped with eyelets on the edge with a strap.
- a strap is threaded through the eyelets around the edge of the film.
- the loading grip strap here is generally meant a rope, a strap or a train, wherein the strap can also be made elastic.
- the film surrounds the edge of the opening of the reflector and the edge of the film lies on the back of the reflector. To fasten the film, the strap is pulled together and fixed in a suitable manner, for. B. knotted.
- the film covers the opening of the reflector like a chord.
- Such a film can also be attached to the parabolic antenna using a spider.
- a so-called spider consists of a bundle of elastic drawstrings, all of which have approximately the same length and are bundled in the middle, ie. H. z. B. are connected to each other by means of a further strap. At their ends the straps have a device, e.g. B. a hook with which they can be attached in the eyelets. The straps are then attached to the back of the reflector on the eyelets of the film and fixed so that it covers the opening of the reflector.
- a continuous tensioning strap in particular an elastic tensioning strap
- the type of attachment is irrelevant according to the invention, but can be designed, for example, in such a way that the tensioning band is inserted in a pocket running around the edge of the film.
- the film is placed over the opening of the folded up and fastened with the tensioning strap on the back of the reflector.
- the most important embodiment of the invention is that the film is printed or labeled.
- the motives for this include Panoramas, symbols, art prints, photo prints and portraits, company names and any color samples suggested.
- the parabolic antenna can be given an appealing, individual appearance by printing or labeling the film as desired.
- the printing of a film, in particular a plastic film can be done in a simple and inexpensive manner, for. B. with the roller screen printing process.
- Important requirements for the printing or writing color are of course also the transparency for electromagnetic waves in the frequency range of 3 - 30 GHz and the resistance to UV radiation.
- a known cartoon character, a picture motif or the like can be used. be printed on.
- the printing or writing color is also UV-resistant, abrasion and weatherproof, i.e. it does not decompose or change its properties under the influence of weather and sunlight or mechanical influences.
- the film can also be attached to the reflector with two straps, in particular made of an inelastic material such as an expansion-free rope.
- the ropes are wrapped around the film threaded through the eyelets.
- the two ropes are each attached at one end to the film, for a plastic rope, for. B. welded in order to lash the film.
- the film be glued to the reflector with adhesives matched to the materials. If the reflector body is made of plastic with a metallic coating on the inside, a plastic film can also be welded on. Furthermore, a film can also be equipped with Velcro fasteners, magnets or suction cups, with the corresponding fastening devices being attached to the reflector. It can also be fastened with press studs or tabs that engage behind the projections on the reflector.
- the film To increase the durability of the film, it is provided with a coating that is naturally transparent to the electromagnetic waves and UV-resistant, weather-resistant and / or abrasion-resistant to avoid damage to the film from external influences.
- Corresponding coating materials are known in the prior art.
- FIG. 1 shows a schematic cross section of a parabolic antenna with a film
- Figure 2 shows the view of a film.
- FIG. 1 shows a parabolic antenna, the dish-shaped reflector (1) of which is covered by a film (2) in the manner of a chord.
- the detector holder (5) is attached to the edge of the reflector, so that the film (2) is provided with a recess (6) in order to allow the detector holder (5) to pass through.
- the film (2) engages around the edge of the opening of the reflector (1) and lies on the back of the reflector (1).
- the type of attachment of the film (2) is irrelevant in this embodiment.
- the film (2) is equipped with eyelets (4) which are distributed equidistantly over the edge of the film (2).
- the film (2) also has a slot (3) which serves to drain off condensed water and a recess (6) for the deflector holder (5).
- the strap (7) threaded through the eyelets (4) is tightened after the film (2) has been slipped over the opening of the reflector (1) and z. B. knotted.
- the film is detachably attached to the parabolic antenna and covers the opening of the reflector.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU34174/00A AU3417400A (en) | 1999-02-20 | 2000-02-18 | Parabolic antenna |
EP00912382A EP1155472A1 (en) | 1999-02-20 | 2000-02-18 | Parabolic antenna |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1999107353 DE19907353A1 (en) | 1999-02-20 | 1999-02-20 | Parabolic antenna |
DE19907353.8 | 1999-02-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000049681A1 true WO2000049681A1 (en) | 2000-08-24 |
Family
ID=7898295
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2000/000458 WO2000049681A1 (en) | 1999-02-20 | 2000-02-18 | Parabolic antenna |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1155472A1 (en) |
AU (1) | AU3417400A (en) |
DE (1) | DE19907353A1 (en) |
WO (1) | WO2000049681A1 (en) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3781898A (en) * | 1972-07-03 | 1973-12-25 | A Holloway | Spiral antenna with dielectric cover |
US4918459A (en) * | 1989-02-27 | 1990-04-17 | Teso John S De | Apparatus for protecting antennas |
GB2246242A (en) * | 1990-06-02 | 1992-01-22 | Michael Brassington | Satellite dish cover |
EP0551710A1 (en) * | 1992-01-13 | 1993-07-21 | Space Systems / Loral, Inc. | Self-supporting convex cover for spacecraft hardware |
DE4325555A1 (en) * | 1993-07-29 | 1995-02-02 | Siemens Ag | Arrangement for fastening antenna covers |
US5451972A (en) * | 1994-05-12 | 1995-09-19 | Paul Dean Franklin | Satellite antenna dish cover |
US5729241A (en) * | 1996-05-28 | 1998-03-17 | Ergen; Charles W. | Direct broadcast satellite antenna cover |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE9410639U1 (en) * | 1994-07-01 | 1994-12-15 | Lankes Helmut | Bowl for a reception system |
DE9416493U1 (en) * | 1994-10-13 | 1994-12-15 | Kolbe & Co Hans | Radome |
DE29611497U1 (en) * | 1996-07-02 | 1997-03-06 | Woltmann Thorsten | Satellite dish protection device |
DE29618983U1 (en) * | 1996-11-04 | 1997-01-09 | Reese Horst | Film with self-adhesive / self-adhesive properties |
DE29705811U1 (en) * | 1997-04-02 | 1997-05-28 | Spies Oliver | Cover for the parabolic mirror of a TV satellite reception system |
DE29706047U1 (en) * | 1997-04-05 | 1997-10-23 | Goettl Josef | Plastic film with picture motif for sticking on a satellite reception mirror |
DE29814765U1 (en) * | 1998-08-18 | 1999-02-18 | Landefeld Carsten | Decorative film for satellite antennas |
-
1999
- 1999-02-20 DE DE1999107353 patent/DE19907353A1/en not_active Withdrawn
-
2000
- 2000-02-18 WO PCT/DE2000/000458 patent/WO2000049681A1/en not_active Application Discontinuation
- 2000-02-18 AU AU34174/00A patent/AU3417400A/en not_active Abandoned
- 2000-02-18 EP EP00912382A patent/EP1155472A1/en not_active Withdrawn
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3781898A (en) * | 1972-07-03 | 1973-12-25 | A Holloway | Spiral antenna with dielectric cover |
US4918459A (en) * | 1989-02-27 | 1990-04-17 | Teso John S De | Apparatus for protecting antennas |
GB2246242A (en) * | 1990-06-02 | 1992-01-22 | Michael Brassington | Satellite dish cover |
EP0551710A1 (en) * | 1992-01-13 | 1993-07-21 | Space Systems / Loral, Inc. | Self-supporting convex cover for spacecraft hardware |
DE4325555A1 (en) * | 1993-07-29 | 1995-02-02 | Siemens Ag | Arrangement for fastening antenna covers |
US5451972A (en) * | 1994-05-12 | 1995-09-19 | Paul Dean Franklin | Satellite antenna dish cover |
US5729241A (en) * | 1996-05-28 | 1998-03-17 | Ergen; Charles W. | Direct broadcast satellite antenna cover |
Also Published As
Publication number | Publication date |
---|---|
AU3417400A (en) | 2000-09-04 |
DE19907353A1 (en) | 2000-09-28 |
EP1155472A1 (en) | 2001-11-21 |
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