EP0044502A1 - Polarising device for conversion of linearly polarised into circularly polarised electromagnetic waves, mounted in front of a parabolic reflector antenna - Google Patents

Polarising device for conversion of linearly polarised into circularly polarised electromagnetic waves, mounted in front of a parabolic reflector antenna Download PDF

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Publication number
EP0044502A1
EP0044502A1 EP81105473A EP81105473A EP0044502A1 EP 0044502 A1 EP0044502 A1 EP 0044502A1 EP 81105473 A EP81105473 A EP 81105473A EP 81105473 A EP81105473 A EP 81105473A EP 0044502 A1 EP0044502 A1 EP 0044502A1
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Prior art keywords
umpolarisiereinrichtung
lines
conductors
polarization
meandering
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EP81105473A
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German (de)
French (fr)
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EP0044502B1 (en
Inventor
Anton Dipl.-Ing. Brunner
Klaus Dr. Rieskamp
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Siemens AG
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Siemens AG
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    • 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
    • H01Q15/02—Refracting or diffracting devices, e.g. lens, prism
    • H01Q15/12—Refracting or diffracting devices, e.g. lens, prism functioning also as polarisation filter
    • 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 polarizing device for generating circularly polarized electromagnetic waves using a single or multi-layer grating structure attached in front of a radiation aperture, each of which consists of a plurality of lines, meandering lines, line-rectangle combinations or the like. there are parallel conductors.
  • the suppression or decoupling of the cross polarization or in general the orthogonal or depolarization compared to a desired linear or circular polarization is for many applications, e.g. of great importance to avoid crosstalk in double polarization operation or to achieve the necessary accuracy in direction finding procedures.
  • gratings with metal strips or wires running perpendicular to the E vector can be used in a known manner.
  • the cross polarization component running parallel to the wires is reflected and thus suppressed.
  • the degree of suppression of the cross-polarization components is further increased.
  • the object of the invention is to convert the given polarization of an antenna into a .. circular polarization with the aid of an integrated single grid-like arrangement, the different cross-polarization component distributed over the antenna aperture being suppressed during the conversion or the resulting co-and cross-polarization resulting Polarization should be converted into the pure, desired polarization.
  • These two tasks namely polarization conversion and orthogonal polarization suppression, have always been carried out in separate facilities and independently of one another.
  • the above-mentioned object is achieved in that the grating structure also has one or more additional layers arranged closer to the radiation aperture, each of which consists of a grating, the straight one of which Line-shaped conductors for linear polarization filtering also run parallel to one another and in such a direction that counter over the direction of the meandering or the like. extending conductor is inclined at 45 0 .
  • the lattice structure is thus constructed overall such that first a linear polarization filtering is carried out and finally the radiation present in the filtered linear polarization is converted into radiation with circular polarization.
  • linear polarization filtering only that radiation component is let through whose E vector is perpendicular to the straight conductors running parallel to one another.
  • the principle according to the invention can be used both for a flat polarization grating and for a curved one, e.g. apply conical if the orientation of the conductor structure on the projection in a plane perpendicular to the main radiation axis, i.e. to the antenna axis.
  • the circular-polarizing and the linear-polarizing filtering conductors of the lattice structure are advantageously etched metal strips on a plastic film.
  • insulating layers are advantageously used, which consist of hard foam or can be designed as a honeycomb structure.
  • the polarity reversing device according to the invention can expediently be provided with an aperture cover (radome) of an antenna, e.g. a target tracking radar antenna.
  • radome e.g. a target tracking radar antenna.
  • the lattice structure bev shown in FIGS. 1 and 2 consists of two layers 1 and 2, which are formed by parallel, straight conductor tracks, and three layers 3, 4 and 5, each of several, in the form of meandering lines parallel to each other extending conductors 6 exist.
  • the main direction of expansion of the meandering conductor tracks 6 is inclined at 45 ° with respect to the conductor tracks 7 of the layers 1 and 2.
  • the combined grating structure lies in front of the radiation aperture of an antenna, which is composed of a primary radiator 8 and a reflector 9.
  • the primary emitter 8 emits radiation in linear polarization with a direction which is indicated by the arrow 10.
  • the reflection on the parabolic mirror 9 creates cross-polarization components.
  • Radiation with non-ideal linear polarization then falls on the grating structure in front of the antenna aperture.
  • the first two layers 1 and 2 of this grating structure then effect a linear polarization filtering, so that only the radiation with the polarization indicated by the arrow 10 is passed to the layers 3, 4 and 5 because of the vertical alignment of the conductor tracks 7.
  • the layers 3, 4 and 5 then bring about the conversion of the ideal linear polarization arriving there into a circular polarization, which then has no orthogonal polarization components.
  • FIG. 3 shows a section of the polarization grid according to FIGS. 1 and 2 with five metal grid structures one above the other, which are each produced on a plastic film 11, 12, 13, 14 and 15, for example by an etching process.
  • Each of the three lattice structures 11, 12 and 13 consists of a large number of meandering conductor tracks 16.
  • the conductor tracks 16 which are attached to the film 12 and run parallel to one another lie between the conductor tracks 16 applied to the films 11 and 13 the plastic films 14 and 15 consist of a large number of rectilinear conductor tracks 17 . .
  • insulating layers 18, 19, 20 and 21 are arranged between these foils, which are advantageously embodied in a honeycomb structure, in particular for reasons of weight saving.
  • the thickness of the entire grating is, for example, half a wavelength.
  • the conductor tracks 16 and 17 correspond to the conductor tracks 6 and 7 in FIG. 1.
  • FIG. 4 shows two conductor tracks 16 arranged on a film and running parallel to one another in relation to the direction of the E vector present at this point of the incident wave which has already been linearly polarized on layers 1 and 2 (FIGS. 1 and 2).
  • the meandering conductor tracks 16 have, for example, an amplitude of one eighth wavelength and a spacing of approximately one tenth wavelength.

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Abstract

Polarisiereinrichtung zur Erzeugung zirkular polarisierter elektromagnetischer Wellen unter Verwendung einer vor einer Strahlungsapertur angebrachten ein- oder mehrschichtigen Gitterstruktur, die jeweils aus mehreren insbesondere mäanderförmigen und parallel zueinander verlaufenden Leitern (6) besteht. Nach der Erfindung weist die Gitterstruktur noch eine oder mehrere zusätzliche, näher an der Strahlungsapertur liegende Schichten (1, 2) auf, die jeweils aus einem Gitter bestehen, dessen Leiter (7) ebenfalls parallel zueinander verlaufen, aber um 45° genenüber der Richtung der in Mäanderlinienform o.dgl. verlaufenden Leiter (6) geneigt sind. Außer der Polarisationsumwandlung in Zirkularpolarisation wird mit der Anordnung, die für ein Radom einer Zielfolgeradarantenne geeignet ist, zugleich eine Orthogonalpolarisationsunterdrückung erreicht.Polarizing device for generating circularly polarized electromagnetic waves using a single-layer or multi-layer grating structure attached in front of a radiation aperture, each of which consists of a plurality of conductors (6), in particular meandering and parallel to one another. According to the invention, the grating structure has one or more additional layers (1, 2) closer to the radiation aperture, each of which consists of a grating, the conductors (7) of which also run parallel to one another, but by 45 ° with respect to the direction of the in the form of a meander or the like. extending conductor (6) are inclined. In addition to the polarization conversion into circular polarization, the arrangement which is suitable for a radome of a target follower radar antenna also achieves orthogonal polarization suppression.

Description

Die Erfindung bezieht sich auf eine Umpolarisiereinrichtung zur Erzeugung zirkular polarisierter elektromagnetischer Wellen unter Verwendung einer vor einer Strahlungsapertur angebrachten ein- oder mehrschichtigen Gitterstruktur,.die jeweils aus mehreren, in Form von Linien, Mäanderlinien, Linien-Rechteck-Kombinationen o.dgl. parallel zueinander verlaufenden Leitern besteht.The invention relates to a polarizing device for generating circularly polarized electromagnetic waves using a single or multi-layer grating structure attached in front of a radiation aperture, each of which consists of a plurality of lines, meandering lines, line-rectangle combinations or the like. there are parallel conductors.

Primärstrahler, z.B. für Such- und Zielfolgeradarantennen, werden der leichteren Realisierbarkeit wegen zumeist für lineare Polarisation ausgeführt. Da bei Radaranwendungen für eine Verringerung der Reflexionswirkungen von Regenwolken jedoch die Verwendung zirkularer Polarisation günstiger ist, wird die lineare Polarisation der Antenne häufig durch eine Gitterstruktur vor der Antennenapertur in eine zirkulare Polarisation umgewandelt. Ein solcher Polarisationswandler mit Gitterstruktur ist z.B. aus der US-PS 3 754 271 bekannt. Danach erzeugen unter 45° zum E-Vektor (=elektrischer Feldvektor)der einfallenden Welle verlaufende Mäanderlinien durch die kapazitive bzw. induktive Beeinflussung der senkrecht und parallel zu ihnen liegenden E-Vektorkomponenten einen Phasenunterschied, für den bei geeigneter Dimensionierung und Schichtung der für zirkulare Polarisation notwendige Wert von 90° erreicht wird.Primary radiators, e.g. for search and target follow-up antennas are mostly carried out for linear polarization because of the easier feasibility. However, since the use of circular polarization is more favorable in radar applications for reducing the reflection effects of rain clouds, the linear polarization of the antenna is often converted into a circular polarization by a grating structure in front of the antenna aperture. Such a polarization converter with a lattice structure is e.g. known from U.S. Patent No. 3,754,271. Then, at 45 ° to the E-vector (= electric field vector) of the incident wave, meandering lines running through the capacitive or inductive influence of the perpendicular and parallel to them E-vector components produce a phase difference for which, with suitable dimensioning and stratification, that for circular polarization necessary value of 90 ° is reached.

Auch andere Gitterstrukturen, bestehend aus geraden Linien in bestimmten Abständen in mehreren Schichten sowie Linien-Rechteck-Kombinationen sind zur Erzeugung. zirkularer Polarisation bekannt.Other lattice structures, consisting of straight lines at certain intervals in several layers as well as line-rectangle combinations, are also possible. circular polarization known.

Die Unterdrückung bzw. Entkopplung der Kreuzpolarisation oder im allgemeinen der Orthogonal- oder Depolarisation gegenüber einer gewünschten Linear- oder Zirkularpolarisation ist für viele Anwendungen, z.B. zur Vermeidung von Übersprechen bei Doppelpolarisationsbetrieb oder zur Erzielung der nötigen Genauigkeit bei Peilverfahren, von großer Wichtigkeit. Dazu können in bekannter Weise bei'linearer Polarisation Gitter mit bezüglich des E-Vektors senkrecht verlaufenden Metallstreifen oder Drähten verwendet werden. Die parallel zu den Drähten verlaufende Kreuzpolarisationskomponente wird reflektiert und damit unterdrückt. Durch die Verwendung mehrerer solcher Gitterschichten wird der Grad der Unterdrückung der Kreuzpolarisationskomponenten noch erhöht.The suppression or decoupling of the cross polarization or in general the orthogonal or depolarization compared to a desired linear or circular polarization is for many applications, e.g. of great importance to avoid crosstalk in double polarization operation or to achieve the necessary accuracy in direction finding procedures. For this purpose, with linear polarization, gratings with metal strips or wires running perpendicular to the E vector can be used in a known manner. The cross polarization component running parallel to the wires is reflected and thus suppressed. By using several such grating layers, the degree of suppression of the cross-polarization components is further increased.

Aufgabe der Erfindung ist es, mit Hilfe einer integrierten einzigen gitterähnlichen Anordnung die gegebene Polarisation einer Antenne in eine.. zirkulare Polarisation umzuwandeln, wobei der über die Antennenapertur verteilte, unterschiedliche Kreuzpolarisationsanteil bei der Umwandlung unterdrückt werden oder die aus Ko- und Kreuzpolarisation bestehende, resultierende Polarisation in die reine, gewünschte Polarisation umgewandelt werden soll. Diese beiden Aufgaben, nämlich die Polarisationsumwandlung und die Orthogonalpolarisationsunterdrückung wurden bisher stets in getrennten Einrichtungen und voneinander unabhängig durchgeführt.The object of the invention is to convert the given polarization of an antenna into a .. circular polarization with the aid of an integrated single grid-like arrangement, the different cross-polarization component distributed over the antenna aperture being suppressed during the conversion or the resulting co-and cross-polarization resulting Polarization should be converted into the pure, desired polarization. These two tasks, namely polarization conversion and orthogonal polarization suppression, have always been carried out in separate facilities and independently of one another.

Gemäß der Erfindung , die sich auf eine Umpolarisiereinrichtung der eingangs genannten Art bezieht, wird die vorstehend genannte Aufgabe dadurch gelöst, daß die Gitterstruktur noch eine oder mehrere zusätzliche, näher an der Strahlungsapertur angeordnete Schichten aufweist, die jeweils aus einem Gitter bestehen, dessen als gerade Linien ausgebildete Leiter zur Linearpolarisationsfilterung ebenfalls parallel zueinander verlaufen und zwar in solch einer Richtung, die gegenüber der Richtung der in Mäanderlinienform o.dgl. verlaufenden Leiter um 450 geneigt ist. Die Gitterstruktur ist somit insgesamt so aufgebaut, daß zunächst eine Linearpolarisationsfilterung durchgeführt und abschließend die in der ausgefilterten Linearpolarisation vorliegende Strahlung in eine Strahlung mit Zirkularpolarisation umgewandelt wird. Bei der Linearpolarisationsfilterung wird nur derjenige Strahlungsanteil durchgelassen, dessen E-Vektor senkrecht zu den parallel zueinander verlaufenden, geradlinigen Leitern steht.According to the invention, which relates to a polarization reversing device of the type mentioned at the outset, the above-mentioned object is achieved in that the grating structure also has one or more additional layers arranged closer to the radiation aperture, each of which consists of a grating, the straight one of which Line-shaped conductors for linear polarization filtering also run parallel to one another and in such a direction that counter over the direction of the meandering or the like. extending conductor is inclined at 45 0 . The lattice structure is thus constructed overall such that first a linear polarization filtering is carried out and finally the radiation present in the filtered linear polarization is converted into radiation with circular polarization. In the case of linear polarization filtering, only that radiation component is let through whose E vector is perpendicular to the straight conductors running parallel to one another.

Das Prinzip nach der Erfindung läßt sich sowohl für ein ebenes Polarisationsgitter als auch für ein gekrümmtes, z.B. kegelförmiges anwenden, wenn die Orientierung der Leiterstruktur auf die Projektion in einer Ebene senkrecht zur Hauptstrahlungsachse, d.h. zur Antennenachse, bezogen ist.The principle according to the invention can be used both for a flat polarization grating and for a curved one, e.g. apply conical if the orientation of the conductor structure on the projection in a plane perpendicular to the main radiation axis, i.e. to the antenna axis.

In vorteilhafter Weise sind die zirkularpolarisierenden und die linearpolarisationsfilternden Leiter der Gitterstruktur geätzte Metallstreifen auf einer Kunststoff-Folie.The circular-polarizing and the linear-polarizing filtering conductors of the lattice structure are advantageously etched metal strips on a plastic film.

Zur Abstandshaltung zwischen den einzelnen Folien werden in zweckmäßiger Weise Isolierstoffschichten verwendet, welche aus Hartschaum bestehen oder als Wabenstruktur ausgebildet werden können.To keep the spacing between the individual foils, insulating layers are advantageously used, which consist of hard foam or can be designed as a honeycomb structure.

Die Umpolarisiereinrichtung nach der Erfindung läßt sich in zweckmäßiger Weise mit einer Aperturabdeckung (Radom) einer Antenne, z.B. einer Zielfolgeradarantenne, zusammenfassen.The polarity reversing device according to the invention can expediently be provided with an aperture cover (radome) of an antenna, e.g. a target tracking radar antenna.

Die Erfindung wird im folgenden anhand eines in vier Figuren dargestellten Ausführungsbeispiels näher erläutert.The invention is explained below with reference to an embodiment shown in four figures.

Es zeigen:

  • Fig. 1 eine insgesamt fünfschichtige Gitterstruktur nach der Erfindung in einer Schrägansicht,
  • Fig. 2 die Gitterstruktur vor einer Antenne in einer Ansicht von oben,
  • Fig. 3 die Schrägansicht eines Ausschnitts dieser fünfschichtig ausgebildeten Einrichtung nach den Figuren 1 und 2, und
  • Fig. 4 in Draufsicht einen Ausschnitt der mäanderförmigen Leiterbahnen.
Show it:
  • 1 shows an overall five-layer lattice structure according to the invention in an oblique view,
  • 2 the grating structure in front of an antenna in a view from above,
  • 3 shows the oblique view of a section of this five-layer device according to FIGS. 1 and 2, and
  • Fig. 4 in plan view a section of the meandering conductor tracks.

Die in den Fig. 1 und 2 dargestellte Gitterstruktur bev steht aus zwei Schichten 1 und 2, welche durch parallel zueinander verlaufende, geradlinige Leiterbahnen gebildet werden, und drei Schichten 3, 4 und 5, die jeweils aus mehreren, in Form von Mäanderlinien parallel zueinander verlaufenden Leitern 6 bestehen. Die Hauptausdehnungsrichtung der mäanderförmigen Leiterbahnen 6 ist um 45° gegenüber den Leiterbahnen 7 der Schichten 1 und 2 geneigt. Die kombinierte Gitterstruktur liegt vor der Strahlungsapertur einer Antenne, welche aus einem Primärstrahler 8 und einem Reflektor 9 zusammengesetzt ist. Der Primärstrahler 8 gibt eine Strahlung in linearer Polarisation mit einer Richtung ab, welche durch den Pfeil 10 angedeutet ist. Bei der Reflexion am Parabolspiegel 9 entstehen.Kreuzpolarisationskomponenten. Auf die Gitterstruktur vor der Antennenapertur fällt dann eine Strahlung mit nicht idealer linearer Polarisation. Die ersten beiden Schichten 1 und 2 dieser Gitterstruktur bewirken dann eine Linearpolarisationsfilterung, so daß nur die Strahlung mit der durch den Pfeil 10 angedeuteten Polarisation zu den Schichten 3, 4 und 5 wegen der senkrechten Ausrichtung der Leiterbahnen 7 durchgelassen wird. Die Schichten 3, 4 und 5 bewirken dann die Umwandlung der dort ankommenden idealen Linearpolarisation in eine Zirkularpolarisation, die dann keine Orthogonalpolarisationskomponenten aufweist.The lattice structure bev shown in FIGS. 1 and 2 consists of two layers 1 and 2, which are formed by parallel, straight conductor tracks, and three layers 3, 4 and 5, each of several, in the form of meandering lines parallel to each other extending conductors 6 exist. The main direction of expansion of the meandering conductor tracks 6 is inclined at 45 ° with respect to the conductor tracks 7 of the layers 1 and 2. The combined grating structure lies in front of the radiation aperture of an antenna, which is composed of a primary radiator 8 and a reflector 9. The primary emitter 8 emits radiation in linear polarization with a direction which is indicated by the arrow 10. The reflection on the parabolic mirror 9 creates cross-polarization components. Radiation with non-ideal linear polarization then falls on the grating structure in front of the antenna aperture. The first two layers 1 and 2 of this grating structure then effect a linear polarization filtering, so that only the radiation with the polarization indicated by the arrow 10 is passed to the layers 3, 4 and 5 because of the vertical alignment of the conductor tracks 7. The layers 3, 4 and 5 then bring about the conversion of the ideal linear polarization arriving there into a circular polarization, which then has no orthogonal polarization components.

Fig. 3 zeigt einen Ausschnitt des Polarisationsgitters nach den Fig. 1 und 2 mit fünf Metallgitterstrukturen übereinander, welche jeweils auf einer Kunststoffolie 11, 12, 13, 14 und 15 z.B. nach einem Ätzverfahren hergestellt sind. Jede der drei Gitterstrukturen 11, 12 und 13 besteht aus einer.Vielzahl von mäanderförmigen Leiterbahnen 16. Bei Draufsicht liegen die auf der Folie 12 angebrachten, parallel zueinander verlaufenden Leiterbahnen 16 zwischen den auf den Folien 11 und 13 aufgebrachten Leiterbahnen 16. Die beiden Gitterstrukturen auf den Kunststoffolien 14 und 15 bestehen aus einer Vielzahl von geradlinigen Leiterbahnen 17.. Damit ein bestimmter Abstand zwischen den Folien 11 bis 15 gehalten werden kann, sind zwischen diesen Folien Isolierstoffschichten 18, 19, 20 und 21 angeordnet, welche insbesondere aus Gründen der Gewichtsersparnis vorteilhaft in einer Wabenstruktur ausgeführt sind. Die Dicke des gesamten Gitters beträgt beispielsweise eine halbe Wellenlänge. Die Leiterbahnen 16 und 17 entsprechen den Leiterbahnen 6 bzw. 7 in der Fig. 1.FIG. 3 shows a section of the polarization grid according to FIGS. 1 and 2 with five metal grid structures one above the other, which are each produced on a plastic film 11, 12, 13, 14 and 15, for example by an etching process. Each of the three lattice structures 11, 12 and 13 consists of a large number of meandering conductor tracks 16. When viewed from above, the conductor tracks 16 which are attached to the film 12 and run parallel to one another lie between the conductor tracks 16 applied to the films 11 and 13 the plastic films 14 and 15 consist of a large number of rectilinear conductor tracks 17 . . So that a certain distance between the foils 11 to 15 can be kept, insulating layers 18, 19, 20 and 21 are arranged between these foils, which are advantageously embodied in a honeycomb structure, in particular for reasons of weight saving. The thickness of the entire grating is, for example, half a wavelength. The conductor tracks 16 and 17 correspond to the conductor tracks 6 and 7 in FIG. 1.

Fig. 4 zeigt zwei auf einer Folie angeordnete und zueinander parallel verlaufende Leiterbahnen 16 in bezug zur Richtung des an dieser Stelle vorliegenden E-Vektors der einfallenden und bereits an den Schichten 1 und 2 (Fig. 1 und 2) linearpolarisationsgefilterten Welle. Die mäanderförmigen Leiterbahnen 16weisen beispielsweise eine Amplitude von einer achtel Wellenlänge und einen Abstand von etwa einer zehntel WellenlängeÄuf.FIG. 4 shows two conductor tracks 16 arranged on a film and running parallel to one another in relation to the direction of the E vector present at this point of the incident wave which has already been linearly polarized on layers 1 and 2 (FIGS. 1 and 2). The meandering conductor tracks 16 have, for example, an amplitude of one eighth wavelength and a spacing of approximately one tenth wavelength.

Claims (6)

1. Umpolarisiereinrichtung zur Erzeugung zirkular polarisierter elektromagnetischer Wellen unter Verwendung einer vor einer Strahlungsapertur angebrachten ein- oder mehrschichtigen Gitterstruktur, die jeweils aus mehreren, in Form von Linien, Mäanderlinien, Linien-Recheck-Kombinationen o.dgl. parallel zueinander verlaufenden Leitern besteht, dadurch gekennzeichnet , daß die Gitterstruktur noch eine oder mehrere zusätzliche, näher an der Strahlungsapertur angeordnete Schichten (1, 2) aufweist, die jeweil aus einem Gitter bestehen, dessen als gerade Linien (7) ausgebildete Leiter zur Linearpolarisationsfilterung ebenfalls parallel zueinander verlaufen und zwar in solch einer Richtung, die gegenüber der Richtung der in Mäanderlinienform o.dgl. verlaufenden Leiter (6) um 450 geneigt ist.1. Umpolarisiereinrichtung for generating circularly polarized electromagnetic waves using a single or multi-layer grating structure attached in front of a radiation aperture, each of several, in the form of lines, meandering lines, line-Reckck combinations or the like. Conductors running parallel to one another, characterized in that the grating structure also has one or more additional layers (1, 2) arranged closer to the radiation aperture, each of which consists of a grating, the conductors of which are designed as straight lines (7) for linear polarization filtering as well run parallel to each other in such a direction that the like in relation to the direction of the meandering line or the like. extending conductor (6) is inclined at 45 0 . 2. Umpolarisiereinrichtung nach Anspruch1, dadurch gekennzeichnet , daß die linearpolarisationsfilternden geradlinigen und die zirkularpolarisierenden, z.B. in Mäanderlinien verlaufenden Leiter (16, 17) geätzte Metallstreifen auf jeweils einer Kunststoffolie (11 bis 15) sind.2. Umpolarisiereinrichtung according to claim 1, characterized in that the linear polarization filtering rectilinear and the circular polarizing, e.g. conductors (16, 17) running in meandering lines are etched metal strips each on a plastic film (11 to 15). 3. Umpolarisiereinrichtung nach Anspruch 1 und 2, d a-durch gekennzeichnet, daß zur Abstandshaltung zwischen den Folien(11 bis 15) Isolierstoffschichten (18 bis 21) angeordnet sind, welche aus Hartschaum bestehen oder als Wabenstruktur ausgebildet werden können.3. Umpolarisiereinrichtung according to claim 1 and 2, d a-characterized in that for spacing between the films (11 to 15) insulating layers (18 to 21) are arranged, which consist of hard foam or can be formed as a honeycomb structure. 4. Umpolarisiereinrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet , daß bei einer gekrümmten, d.h. nicht ebenen Gitterstruktur, die in Anspruch 1 angegebene Orientierung der linearpolarisationsfilternden geraden Linien und der zirkularpolarisierenden Linien z.B. der Mäanderlinien auf die Projektion in einer Ebene senkrecht zur Hauptstrahlungsachse bezogen ist.4. Umpolarisiereinrichtung according to any one of the preceding claims, characterized in that in a curved, ie non-planar lattice structure, the orientation of the linear polarization filtering straight lines specified in claim 1 and the circular polarizing lines, for example the meandering lines, are related to the projection in a plane perpendicular to the main radiation axis. 5. Umpolarisiereinrichtung nach einem der vorhergehenden Ansprüche, gekennzeichnet durch die Verwendung als Aperturabdeckung einer Antenne.5. Umpolarisiereinrichtung according to any one of the preceding claims, characterized by the use as an aperture cover of an antenna. 6. Umpolarisiereinrichtung nach Anspruch 5, dadurch gekennzeichnet , daß die Antenne eine Zielfolgeradarantenne mit einem abgedeckten Reflektorspiegel ist und daß die Gitterstruktur in der Reflektoraperturabdeckung (Radom) enthalten ist.6. Umpolarisiereinrichtung according to claim 5, characterized in that the antenna is a target follower radar antenna with a covered reflector mirror and that the grating structure is contained in the reflector aperture cover (radome).
EP81105473A 1980-07-17 1981-07-13 Polarising device for conversion of linearly polarised into circularly polarised electromagnetic waves, mounted in front of a parabolic reflector antenna Expired EP0044502B1 (en)

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Application Number Priority Date Filing Date Title
DE3027094 1980-07-17
DE19803027094 DE3027094A1 (en) 1980-07-17 1980-07-17 RE-POLARIZING DEVICE FOR GENERATING CIRCULAR POLARIZED ELECTROMAGNETIC WAVES

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EP0044502A1 true EP0044502A1 (en) 1982-01-27
EP0044502B1 EP0044502B1 (en) 1985-10-16

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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US4786914A (en) * 1985-01-25 1988-11-22 E-Systems, Inc. Meanderline polarization twister
EP0310414A2 (en) * 1987-10-02 1989-04-05 Raytheon Company Lens/polarizer/radome
EP0478852A1 (en) * 1989-03-03 1992-04-08 Hazeltine Corporation Radome having integral heating and impedance matching elements
EP3182505A1 (en) * 2015-12-14 2017-06-21 Terma A/S Radar antenna and radar system
EP3301755B1 (en) * 2016-09-28 2019-12-25 Diehl Metering Systems GmbH Assembly for radio transmission of consumption and/or status data

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US5258768A (en) * 1990-07-26 1993-11-02 Space Systems/Loral, Inc. Dual band frequency reuse antenna
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CN104347957B (en) * 2013-08-01 2018-04-10 深圳光启创新技术有限公司 Realize the Meta Materials and polarizer of polarization conversion
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Cited By (10)

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Publication number Priority date Publication date Assignee Title
US4786914A (en) * 1985-01-25 1988-11-22 E-Systems, Inc. Meanderline polarization twister
GB2185355A (en) * 1986-01-14 1987-07-15 Singer Co Circularly polarized leaky waveguide doppler antenna
FR2592993A1 (en) * 1986-01-14 1987-07-17 Singer Co DOPPLER ANTENNA HAVING SLIT WAVES, CIRCULARLY POLARIZED AND METHOD FOR MANUFACTURING SUCH ANTENNA.
GB2185355B (en) * 1986-01-14 1989-10-25 Singer Co Circularly polarized leaky waveguide doppler antenna
EP0310414A2 (en) * 1987-10-02 1989-04-05 Raytheon Company Lens/polarizer/radome
EP0310414A3 (en) * 1987-10-02 1990-04-25 Raytheon Company Lens/polarizer/radome
EP0478852A1 (en) * 1989-03-03 1992-04-08 Hazeltine Corporation Radome having integral heating and impedance matching elements
EP3182505A1 (en) * 2015-12-14 2017-06-21 Terma A/S Radar antenna and radar system
WO2017102741A1 (en) * 2015-12-14 2017-06-22 Terma A/S Radar antenna and radar system
EP3301755B1 (en) * 2016-09-28 2019-12-25 Diehl Metering Systems GmbH Assembly for radio transmission of consumption and/or status data

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DE3027094A1 (en) 1982-02-04
DE3027094C2 (en) 1987-03-19
US4479128A (en) 1984-10-23
EP0044502B1 (en) 1985-10-16

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