EP0042611A1 - Conductive screen for circularly polarising electromagnetic waves - Google Patents
Conductive screen for circularly polarising electromagnetic waves Download PDFInfo
- Publication number
- EP0042611A1 EP0042611A1 EP81104792A EP81104792A EP0042611A1 EP 0042611 A1 EP0042611 A1 EP 0042611A1 EP 81104792 A EP81104792 A EP 81104792A EP 81104792 A EP81104792 A EP 81104792A EP 0042611 A1 EP0042611 A1 EP 0042611A1
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- European Patent Office
- Prior art keywords
- circular polarization
- lattice structure
- grating
- flat
- cone
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- 230000010287 polarization Effects 0.000 claims abstract description 38
- 239000004020 conductor Substances 0.000 claims abstract description 11
- 230000005855 radiation Effects 0.000 claims abstract description 9
- 238000011161 development Methods 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 239000002985 plastic film Substances 0.000 claims 1
- 229920006255 plastic film Polymers 0.000 claims 1
- 239000002356 single layer Substances 0.000 abstract description 2
- 230000018109 developmental process Effects 0.000 description 11
- 241000237942 Conidae Species 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
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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
- H01Q1/425—Housings not intimately mechanically associated with radiating elements, e.g. radome comprising a metallic grid
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/24—Polarising devices; Polarisation filters
- H01Q15/242—Polarisation converters
- H01Q15/244—Polarisation converters converting a linear polarised wave into a circular polarised wave
Definitions
- the invention relates to a device for converting electromagnetic waves with a given polarization into those with circular polarization using a single-layer or multi-layer conductor grid structure attached in front of a radiation aperture.
- radar devices in particular target radar devices
- linear polarization since under normal conditions this can achieve the greatest range.
- rain cloud echo signals which have a spectral distribution similar to that of destination echo signals cannot be distinguished from "real" destination echo signals.
- circular polarization rain cloud echo signals are strongly attenuated and it is easier to distinguish between flight destinations and rain clouds.
- the linear polarization of an antenna is converted into circular polarization in many cases, for example by means of a polarization grating attached in front of the radiation aperture, which is usually integrated into the radome.
- a polarization grating attached in front of the radiation aperture, which is usually integrated into the radome.
- Such known circular polarization gratings which are described, for example, in US Pat. No. 3,754,271, are flat.
- the object of the invention is to provide instructions for the construction of a circular polarization grating of the type mentioned in the beginning for such cases.
- this object is achieved in that the conductor grid structure is arranged in a non-flat surface and in that the geometric course of the grid structure on the non-flat surface by the projection of a fictitious grid structure arranged in the aperture plane and generating a circular polarization onto the non-flat surface flat surface is determined.
- the basic idea of the invention is to transfer the conductor structures used in flat circular polarization gratings to non-flat, in particular curved, surfaces.
- the lattice structure can consist, for example, of continuous lines, meandering lines, rows of rectangular lines or the like exist.
- a similar circular polarization grating is shown in a side view and a top view in FIG. 2.
- the grating structure does not consist of straight metal conductors, but of meandering metal conductors 2. These are parallel to one another in plan view and side view with respect to their main direction of expansion and have the same spacing from one another. To simplify the drawing, only a small part of the lattice structure is shown as a meandering line.
- a similar circular polarization grating also shows a side view and a top view in FIG. 3.
- the grating structure according to FIG. 3 consists of a line-rectangular pattern. This pattern is designed in such a way that lines and rows of rectangles running parallel to one another are provided both in the top view and in the side view, two rows of rectangles always being immediately adjacent and only then a line following again.
- the individual rectangles are denoted by 3 and the lines by 4, only a few rectangles being indicated in this figure.
- FIG. 4 shows the development of the surface of the cone with the circular polarization grating according to FIG. 1.
- the lines of this grating structure are also designated 1 in FIG. 4.
- the development of the conical surface according to FIG. 4 is obtained by cutting open the conical surface according to FIG. 1, starting from an edge point 5, 6 on the conical base surface up to the tip 7 of the conical surface. The two falling apart in the handling points 5 and 6 fall in the actual conical surface in accordance with F i g. 1 together.
- the point 7 of the development of the conical surface forms the tip of the circular polarization grating in the form of a cone according to FIG. 1.
- FIGS. 5 and 6 show similar developments of the conical surface for the circular polarization grating according to FIGS. 2 and 3.
- Curved line patterns which are given explicitly in the form of mathematical equations for the flat surface of a circular polarization grating, can also be projected onto the conical surface to form a circular polarization grating in the form of a conical shell.
- Fig. 7 shows the development of a conical surface on which a flat sine line with its base line was projected.
- a curved base line 8 in this area of the cone shell, around which a distorted sine line 9 runs. If the development shown in FIG. 7 were to be rolled up into an actual conical surface, ie if points 5 and 6 were to be connected with one another so that a tip 7 was formed, this would result in a top view View and side view of the conical surface of a straight and vertical base line 8, around which an undistorted Sinuline 9 swings.
- FIGS. 1 to 3 Similar with regard to their surface configuration suitable formed circular polarity s ationsgitter can without difficulty into existing radomes, z. B. install a target radar antenna, where due to the available installation. a flat circular polarization grid cannot be used. An electrical loss is not given by designing the grid according to the invention.
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- Aerials With Secondary Devices (AREA)
- Radar Systems Or Details Thereof (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
Einrichtung zur Umwandlung eiektromagnetischer Wellen mit einer gegebenen Polarisation in solche mit zirkularer Polarisation unter Verwendung einer vor einer Strahlungsapertur angebrachten ein-oder mehrschichtigen Leitergitterstruktur. Ist es aufgrund der räumlichen Verhältnisse eines vor der Strahlungsapertur angebrachten Radoms erforderlich, das Zirkularpolarisationsgitter nicht eben auszubilden, so wird der geometrische Verlauf der Gitterstruktur (1) durch die Projektion einer fiktiven, in der Strahlungsaperturebene liegenden und eine zirkulare Polarisation erzeugenden Gitterstruktur auf die nicht ebene, insbesondere kegelmantelförmige Fläche bestimmt. Die Herstellung der Gitterstruktur erfolgt zweckmäßig durch Abwicklung der nicht ebenen Fläche in die ebene Form. Geeignet ist die Einrichtung für ein Radom einer Zielfolgeradarantenne.Device for converting electromagnetic waves with a given polarization into those with circular polarization using a single-layer or multilayer conductor grid structure attached in front of a radiation aperture. If, due to the spatial conditions of a radome attached in front of the radiation aperture, it is necessary not to form the circular polarization grating, the geometric course of the grating structure (1) is projected onto the non-level by the projection of a fictitious grating structure lying in the radiation aperture plane and generating a circular polarization , in particular cone-shaped surface. The lattice structure is expediently produced by unwinding the non-flat surface into the flat shape. The device is suitable for a radome of a target slave radar antenna.
Description
Die Erfindung bezieht sich auf eine Einrichtung zur Umwandlung elektromagnetischer Wellen mit einer gegebenen Polarisation in solche mit zirkularer Polarisation unter Verwendung einer vor einer Strahlungsapertur angebrachten ein- oder mehrschichtigten Leitergitterstruktur.The invention relates to a device for converting electromagnetic waves with a given polarization into those with circular polarization using a single-layer or multi-layer conductor grid structure attached in front of a radiation aperture.
Beispielsweise Radargeräte, insbesondere Zielfolgeradargeräte, werden oft für lineare Polarisation gebaut, da mit dieser unter Normalbedingungen die größte Reichweite erzielt werden kann. Mit einer linear polarisierten Antenne kann man aber Regenwolken-Echosignale, die eine ähnliche Spektralverteilung wie Flugziel-Echosignale haben, von "echten" Flugziel-Echosignalen nicht unterscheiden. Bei Verwendung von Zirkularpolarisation werden dagegen Regenwolken-Echosignale stark gedämpft und es ist eine Unterscheidung zwischen Flugzielen und Regenwolken leichter möglich. Es wird deswegen in vielen Fällen die Linearpolarisation einer Antenne,beispielsweise durch ein vor der Strahlungsapertur angebrachtes Polarisationsgitter, welches in das Radom gewöhnlich integriert ist, in Zirkularpolarisation umgewandelt. Solche bekannten und beispielsweise in der US-Patentschrift 3 754 271 beschriebenen Zirkularpolarisationsgitter sind eben ausgebildet.For example, radar devices, in particular target radar devices, are often built for linear polarization, since under normal conditions this can achieve the greatest range. With a linearly polarized antenna, however, rain cloud echo signals which have a spectral distribution similar to that of destination echo signals cannot be distinguished from "real" destination echo signals. On the other hand, when using circular polarization, rain cloud echo signals are strongly attenuated and it is easier to distinguish between flight destinations and rain clouds. For this reason, the linear polarization of an antenna is converted into circular polarization in many cases, for example by means of a polarization grating attached in front of the radiation aperture, which is usually integrated into the radome. Such known circular polarization gratings, which are described, for example, in US Pat. No. 3,754,271, are flat.
Ein solches ebenes Zirkularpolarisationsgitter läßt sich jedoch häufig in ein bereits bestehendes Radom vor einer Strahlungsapertur wegen der dort verfügbaren Einbaumaße nicht einbauen.However, such a flat circular polarization grating can often not be installed in an existing radome in front of a radiation aperture because of the installation dimensions available there.
Aufgabe der Erfindung ist es, für solche Fälle eine Anleitung zur Konstruktion eines Zirkularpolarisationsgitters der eingangs genannten Art anzugeben. Gemäß der Erfindung wird diese Aufgabe dadurch gelöst, daß die Leitergitterstruktur in einer nicht ebenen Fläche angeordnet ist und daß der geometrische Verlauf der Gitterstruktur auf der nicht ebenen Fläche durch die Projektion einer fiktiven, in der Aperturebene angeordneten und eine zirkulare Polarisation erzeugenden Gitterstruktur auf die nicht ebene Fläche bestimmt ist.The object of the invention is to provide instructions for the construction of a circular polarization grating of the type mentioned in the beginning for such cases. According to the invention, this object is achieved in that the conductor grid structure is arranged in a non-flat surface and in that the geometric course of the grid structure on the non-flat surface by the projection of a fictitious grid structure arranged in the aperture plane and generating a circular polarization onto the non-flat surface flat surface is determined.
Der Grundgedanke der Erfindung besteht darin, die bei ebenen Zirkularpolarisationsgittern verwendeten Leiterstrukturen auf nicht ebene, insbesondere gekrümmte Flächen zu übertragen.The basic idea of the invention is to transfer the conductor structures used in flat circular polarization gratings to non-flat, in particular curved, surfaces.
Als Metallstrukturen werden wegen der wirtschaftlichen Herstellung auf Flächen aufgeätzte Muster häufiger verwendet als rostartige Lamellengitter und dergleichen. Deshalb ist es zweckmäßig, als gekrümmte Fläche die Kegelmantelfläche auszuwählen, die durch Aufrollen der in einer ebenen Fläche geätzten Metallstrukturen gebildet werden kann. Beim kegelmantelförmigen Zirkular- polarisationsgitter nach der Erfindung tritt bei der Herstellung zwar das Problem auf, das ebene Muster in der Kegelgrundfläche auf die Kegelmantelfläche zu projizieren. Da die Leiterschichten nicht ohne weiteres in Kegelform hergestellt werden können, wickelt man die Kegelmantelfläche in vorteilhafter Weise in die ebene Form ab. Das gleiche Herstellungsprinzip gilt für andere, nicht ebene Flächen, auf denen das anzufertigende Zirkularpolarisationsgitter verlaufen soll.Because of the economical production, patterns etched onto surfaces are used more frequently as metal structures than rust-like lamellar grids and the like. It is therefore expedient to select the conical outer surface as the curved surface, which can be formed by rolling up the metal structures etched in a flat surface. In the case of a circular polarization grating in the shape of a cone shell according to the invention, the problem arises during production of projecting the planar pattern in the base area of the cone onto the surface of the cone shell. Since the conductor layers cannot easily be produced in the shape of a cone, the conical surface is advantageously unwound into the flat shape. The same manufacturing principle applies to other, non-flat surfaces on which the circular polarization grating to be produced should run.
Für die insbesondere bei Zielfolgeradareinrichtungen übliche Frequenzbandbreite kommen verschiedene Leitermaster des Zirkularpolarisationsgitters in Frage. Die Gitterstruktur kann beispielsweise aus stetigen Linien, Mäanderlinien, aneinandergereihten Rechteckzeilen oder dergleichen bestehen.Various conductor masters of the circular polarization grating come into question for the frequency bandwidth which is customary in particular for target tracking radar devices. The lattice structure can consist, for example, of continuous lines, meandering lines, rows of rectangular lines or the like exist.
Wenn durch unterschiedliche Verkopplung beim kegelmantelförmigen oder anderen nicht ebenen Zirkular- polarisationsgitter andere Abstände zwischen den stetigen Linien, Mäanderlinien, Rechteckzeilen und dergleichen für eine optimale Zirkularpolarisation notwendig sind als für ein ebenes Gitter, so kann eine dementsprechende Korrektur bei der Herstellung des Gitters, z. B. bei der Ätzung der Kegelmantelfläche, berücksichtigt werden.If, due to different coupling in the cone-shaped or other non-planar circular polarization grating, different distances between the continuous lines, meandering lines, rectangular lines and the like are necessary for optimal circular polarization than for a planar grating, a corresponding correction in the production of the grating, e.g. B. in the etching of the surface of the cone, are taken into account.
Die Erfindung wird im folgenden anhand von mehreren, in sieben Figuren dargestellten Ausführungsbeispielen näher erläutert. Es zeigen:
- Fig. 1 untereinander in Seitenansicht und Draufsicht ein kegelmantelförmiges Zirkularpolarisationsgitter nach der Erfindung mit einer Linienstruktur,
- Fig. 2 untereinander in Seitenansicht und Draufsicht ein kegelmantelförmiges Zirkularpolarisationsgitter nach der Erfindung mit Mäanderstruktur,
- Fig. 3 untereinander in Seitenansicht und Draufsicht ein kegelmantelförmiges Zirkularpolaristionsgitter nach der Erfindung mit Linien-Rechteck-Muster,
- Fig. 4 die Abwicklung der Kegelmantelfläche des Gitters nach Fig. 1,
- Fig. 5 die Abwicklung der Kegelmantelfläche des Gitters nach Fig. 2,
- Fig. 6 die Abwicklung der Kegelmantelfläche des Gitters nach Fig. 3,und
- Fig. 7 die Abwicklung einer Kegelmantelfläche, auf welche als einfaches Beispiel eine Sinuslinie mit ihrer Grundlinie projiziert wurde.
- Fig. 1 zeigt oben in einer Seitenansicht und darunter in einer Draufsicht ein Zirkular-Polarisationsgitter nach der Erfindung, welches kegelmantelförmig ausgebildet und mit dem Radom des Reflektorspiegels einer Zielfolgeradarantenne integrierbar ist. Das Gitter besteht aus metallischen Leitern 1, welche sowohl in der Draufsicht als auch in der Seitenansicht geradlinig und parallel zueinander verlaufen und gleiche Abstände zueinander aufweisen. Der Parameter für den Linienabstand ist mit k bezeichnet.
- 1 is a side view and top view of a circular polarization grating according to the invention with a line structure,
- 2 a side view and a top view of one another, a cone-shaped circular polarization grating according to the invention with a meandering structure,
- 3 a side view and a top view of one another, a cone-shaped circular polarization grating according to the invention with a line-rectangular pattern,
- 4 shows the development of the conical surface of the grating according to FIG. 1,
- 5 shows the development of the conical surface of the grating according to FIG. 2,
- Fig. 6 shows the development of the tapered surface of the grid according to Fig. 3, and
- 7 shows the development of a conical surface on which a sine line with its base line was projected as a simple example.
- 1 shows a circular polarization grating according to the invention at the top in a side view and below in a plan view, which is of conical shape and can be integrated with the radome of the reflector mirror of a target follower radar antenna. The grid consists of metallic conductors 1, which run in a straight line and parallel to one another both in the top view and in the side view and have the same distances from one another. The parameter for the line spacing is designated k.
Ein ähnliches Zirkularpolarisationsgitter zeigt in Seitenansicht und Draufsicht die Fig. 2. Hierbei besteht jedoch die Gitterstruktur nicht aus geradlinigen, sondern aus mäanderförmig ausgebildeten Metalleitern 2. Diese verlaufen in Draufsicht und Seitenansicht bezüglich ihrer Hauptausdehnungsrichtung parallel zueinander und weisen gleiche Abstände untereinander auf. Zur Vereinfachung'der Zeichnung ist nur ein kleiner Teil der Gitterstruktur als Mäanderlinie dargestellt.A similar circular polarization grating is shown in a side view and a top view in FIG. 2. Here, however, the grating structure does not consist of straight metal conductors, but of meandering metal conductors 2. These are parallel to one another in plan view and side view with respect to their main direction of expansion and have the same spacing from one another. To simplify the drawing, only a small part of the lattice structure is shown as a meandering line.
Ein ähnliches Zirkularpolarisationsgitter zeigt ebenfalls in Seitenansicht und Draufsicht die Fig. 3. Im Unterschied zu den vorher beschriebenen Ausführungsbeispielen besteht die Gitterstruktur nach Fig. 3 jedoch aus einem Linien-Rechteck-Muster. Dieses Muster ist so ausgebildet, daß sowohl in der Draufsicht als auch in der Seitenansicht zueinander parallel verlaufende Linien und Rechteckreihen vorgesehen sind, wobei stets zwei Rechteckreihen unmittelbar benachbart sind und erst dann wieder eine Linie folgt. Die einzelnen Rechtecke sind mit 3 und die Linien mit 4 bezeichnet, wobei auch in dieser Figur nur einige Rechtecke angedeutet sind.A similar circular polarization grating also shows a side view and a top view in FIG. 3. In contrast to the previously described exemplary embodiments, the grating structure according to FIG. 3 consists of a line-rectangular pattern. This pattern is designed in such a way that lines and rows of rectangles running parallel to one another are provided both in the top view and in the side view, two rows of rectangles always being immediately adjacent and only then a line following again. The individual rectangles are denoted by 3 and the lines by 4, only a few rectangles being indicated in this figure.
Bei den vorstehend beschriebenen kegelförmigen Zirkularpolarisationsgittern tritt - wie bereits erwähnt - das Problem auf, das ebene Muster in der Kegelgrundfläche auf die Kegelmantelfläche zu projizieren. Da die Gitterstruktur nicht in der Kegelmantelform hergestellt werden kann, wird diese Kegelmantelfläche dazu in die ebene Form abgewickelt.With the conical circular polarization gratings described above, as already mentioned, the problem arises of projecting the flat pattern in the cone base onto the conical surface. Because the grille structure cannot be manufactured in the shape of a cone, this surface of the cone is unwound into the flat shape.
Figur 4 zeigt die Abwicklung der Kegelmantelfläche mit dem Zirkularpolarisationsgitter nach Fig. 1. Die Linien dieser Gitterstruktur sind in Fig. 4 ebenfalls mit 1 bezeichnet. Die Abwicklung der Kegelmantelfläche nach Fig.4 ergibt sich durch Aufschneiden des Kegelmantels nach Fig. 1, ausgehend von einem Randpunkt 5, 6 an der Kegelgrundfläche bis zur Spitze 7 der Kegelmantelfläche. Die beiden in der Abwicklung auseinanderfallenden Punkte 5 und 6 fallen bei der tatsächlichen Kegelmantelfläche gemäß Fig. 1 zusammen. Der Punkt 7 der Abwicklung der Kegelmantelfläche bildet die Spitze des kegelmantelförmigen Zirkularpolarisationsgitters nach Fig. 1.FIG. 4 shows the development of the surface of the cone with the circular polarization grating according to FIG. 1. The lines of this grating structure are also designated 1 in FIG. 4. The development of the conical surface according to FIG. 4 is obtained by cutting open the conical surface according to FIG. 1, starting from an
Die Fig. 5 und 6 zeigen gleichartige Abwicklungen der Kegelmantelfläche für die Zirkularpolarisationsgitter nach den Fig. 2 und 3.5 and 6 show similar developments of the conical surface for the circular polarization grating according to FIGS. 2 and 3.
Auch gekrümmte Linien-Muster, die in Form von mathematischen Gleichungen explizit für die ebene Fläche eines Zirkular-Pölarisationsgitters gegeben sind, können auf den Kegelmantel zur Ausbildung eines kegelmantelförmigen Zirkularpolarisationsgitters projiziert werden.Curved line patterns, which are given explicitly in the form of mathematical equations for the flat surface of a circular polarization grating, can also be projected onto the conical surface to form a circular polarization grating in the form of a conical shell.
Fig. 7 zeigt die Abwicklung einer Kegelmantelfläche, auf welche eine ebene Sinuslinie mit deren Grundlinie projiziert wurde. In der Abwicklung ergibt sich dann in diesem Bereich des Kegelmantels eine gekrümmte Grundlinie 8, um die eine verzerrte Sinuslinie 9 verläuft. Würde man die in Fig. 7 dargestellte Abwicklung zu einer tatsächlichen Kegelmantelfläche zusammenrollen, d. h. die Punkte 5 und 6 miteinander verbinden, so daß sich eine Spitze 7 bildet, so ergäbe sich bei Draufsicht und Seitenansicht auf die Kegelmantelfläche eine geradlinige und senkrechte Grundlinie 8, um welche eine unverzerrte Sinulinie 9 schwingt.Fig. 7 shows the development of a conical surface on which a flat sine line with its base line was projected. In the development, there is a curved base line 8 in this area of the cone shell, around which a distorted
Die in den Ausführungsbeispielen nach Fig. 1 bis 3 dargestellten oder ähnliche, hinsichtlich ihrer Oberflächengestalt passend ausgebildete Zirkular-Polari- sationsgitter lassen sich ohne Schwierigkeiten in bereits bestehende Radome, z. B. einer Zielfolgeradarantenne, einbauen, bei denen aufgrund der verfügbaren Einbau- . maße ein ebenes Zirkularpolarisationsgitter nicht verwendet werden kann. Eine elektrische Einbuße ist durch eine Gestaltung des Gitters nach der Erfindung nichtgegeben.The shown or in the embodiments of FIGS. 1 to 3 similar with regard to their surface configuration suitable formed circular polarity s ationsgitter can without difficulty into existing radomes, z. B. install a target radar antenna, where due to the available installation. a flat circular polarization grid cannot be used. An electrical loss is not given by designing the grid according to the invention.
Claims (9)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3023561 | 1980-06-24 | ||
DE3023561A DE3023561C2 (en) | 1980-06-24 | 1980-06-24 | Conductor grid structure for converting the polarization of electromagnetic waves |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0042611A1 true EP0042611A1 (en) | 1981-12-30 |
EP0042611B1 EP0042611B1 (en) | 1984-09-19 |
Family
ID=6105321
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81104792A Expired EP0042611B1 (en) | 1980-06-24 | 1981-06-22 | Conductive screen for circularly polarising electromagnetic waves |
Country Status (3)
Country | Link |
---|---|
US (1) | US4437099A (en) |
EP (1) | EP0042611B1 (en) |
DE (1) | DE3023561C2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0044502B1 (en) * | 1980-07-17 | 1985-10-16 | Siemens Aktiengesellschaft | Polarising device for conversion of linearly polarised into circularly polarised electromagnetic waves, mounted in front of a parabolic reflector antenna |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5973833A (en) * | 1997-08-29 | 1999-10-26 | Lightware, Inc. | High efficiency polarizing converter |
DE10049410A1 (en) * | 2000-10-05 | 2002-04-11 | Siemens Ag | Mobile phone with multi-band antenna |
JP5955234B2 (en) * | 2013-01-17 | 2016-07-20 | 三菱電機株式会社 | Polarizer |
GB2517290B (en) * | 2013-07-09 | 2016-12-28 | The Sec Dep For Foreign And Commonwealth Affairs | Conductive meander-line and patch pattern for a circular polariser |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3576581A (en) * | 1968-08-15 | 1971-04-27 | Gen Dynamics Corp | Radomes |
GB1240529A (en) * | 1968-08-09 | 1971-07-28 | British Aircraft Corp Ltd | Polarisers |
US3754271A (en) * | 1972-07-03 | 1973-08-21 | Gte Sylvania Inc | Broadband antenna polarizer |
US3907565A (en) * | 1973-12-26 | 1975-09-23 | Bendix Corp | Process for manufacturing domed spiral antennas |
GB1437977A (en) * | 1972-06-30 | 1976-06-03 | Tokyo Keiki Kkk | Radome for slot array antennas |
DE2800101A1 (en) * | 1977-01-12 | 1978-07-13 | Philips Nv | SPOTLIGHT FOR AN ANTENNA, ETC. FOR SATELLITE SIGNALS |
-
1980
- 1980-06-24 DE DE3023561A patent/DE3023561C2/en not_active Expired
-
1981
- 1981-03-20 US US06/246,122 patent/US4437099A/en not_active Expired - Fee Related
- 1981-06-22 EP EP81104792A patent/EP0042611B1/en not_active Expired
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1240529A (en) * | 1968-08-09 | 1971-07-28 | British Aircraft Corp Ltd | Polarisers |
US3576581A (en) * | 1968-08-15 | 1971-04-27 | Gen Dynamics Corp | Radomes |
GB1437977A (en) * | 1972-06-30 | 1976-06-03 | Tokyo Keiki Kkk | Radome for slot array antennas |
US3754271A (en) * | 1972-07-03 | 1973-08-21 | Gte Sylvania Inc | Broadband antenna polarizer |
US3907565A (en) * | 1973-12-26 | 1975-09-23 | Bendix Corp | Process for manufacturing domed spiral antennas |
DE2800101A1 (en) * | 1977-01-12 | 1978-07-13 | Philips Nv | SPOTLIGHT FOR AN ANTENNA, ETC. FOR SATELLITE SIGNALS |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0044502B1 (en) * | 1980-07-17 | 1985-10-16 | Siemens Aktiengesellschaft | Polarising device for conversion of linearly polarised into circularly polarised electromagnetic waves, mounted in front of a parabolic reflector antenna |
Also Published As
Publication number | Publication date |
---|---|
DE3023561A1 (en) | 1982-01-14 |
US4437099A (en) | 1984-03-13 |
DE3023561C2 (en) | 1986-01-02 |
EP0042611B1 (en) | 1984-09-19 |
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