EP0147693B1 - Filtre de polarisation à large bande - Google Patents

Filtre de polarisation à large bande Download PDF

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Publication number
EP0147693B1
EP0147693B1 EP19840114869 EP84114869A EP0147693B1 EP 0147693 B1 EP0147693 B1 EP 0147693B1 EP 19840114869 EP19840114869 EP 19840114869 EP 84114869 A EP84114869 A EP 84114869A EP 0147693 B1 EP0147693 B1 EP 0147693B1
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EP
European Patent Office
Prior art keywords
section
hollow conductor
broadband
branch
cross
Prior art date
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Expired - Lifetime
Application number
EP19840114869
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German (de)
English (en)
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EP0147693A3 (en
EP0147693A2 (fr
Inventor
Norbert Dr.-Ing. Nathrath
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.)
Airbus Defence and Space GmbH
Original Assignee
Daimler Benz Aerospace AG
Messerschmitt Bolkow Blohm AG
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Application filed by Daimler Benz Aerospace AG, Messerschmitt Bolkow Blohm AG filed Critical Daimler Benz Aerospace AG
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/16—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion
    • H01P1/161—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion sustaining two independent orthogonal modes, e.g. orthomode transducer

Definitions

  • the invention relates to a broadband polarization filter for the separation of orthogonally linearly polarized electromagnetic waves, as described in the preamble of claim 1.
  • Such a broadband polarization switch is known from DE-OS 26 51 935.
  • This consists of an input-side waveguide section of square cross section, in which preferably H10 and H01 waves are to be guided. With regard to their field strength vectors, these are polarized linearly and orthogonally to one another.
  • rectangular coupling windows are embedded in two mutually opposite walls of the waveguide section, the length of which corresponds to the side length of the square waveguide cross section and the width of which is half of this.
  • a waveguide arm of the same rectangular cross-section branches off from these coupling windows, at a right angle to the main direction given by the longitudinal axis of the waveguide section, these two laterally branching waveguide arms then merging into one broadband branch after interposition of elbows.
  • the elbows are 180 ° and 90 ° elbows, which are curved in two mutually perpendicular planes. The path of the two coupled-out shafts thus initially runs in a plane perpendicular to the main direction mentioned, in order then to be deflected in a direction parallel to the main direction by means of the two 90 ° elbows.
  • the square waveguide section continues as a continuous waveguide arm, namely below Reduction of its initially square cross-section to a rectangular cross-section of half the cross-sectional area while maintaining one side length.
  • a separating structure is arranged inside it, which essentially consists of a thin, flat sheet metal and is oriented perpendicular to the waveguide walls having the coupling windows. This sheet ends in a tip in the direction of the waveguide section on the input side and serves as a barrier for the polarization components to be coupled into the lateral waveguide arms.
  • the cross-sectional area of the lateral waveguide arms initially corresponds to half the square cross-sectional area of the waveguide section on the input side. Following the two 90 ° elbows, a square cross-section is created again by combining the two waveguide arms, which is then reduced to the original rectangular cross-section of the individual waveguide arm by means of a low-reflection transition.
  • the known broadband polarization crossover it is possible, for example, to cleanly separate the two orthogonal fundamental waves of the type H 1 or H 1, over a wide frequency range.
  • An important area of application of such broadband polarization switches is the communication via satellites. It is still important for parts to be carried by satellites that they are designed to be as space-saving and light as possible, as is the case here with the feed systems for satellite microwave antennas.
  • the known broadband polarization filter is not yet the optimum.
  • due to the relatively wide protruding sides that branch off from the coupling windows Waveguide arms make the overall arrangement bulky and space-consuming.
  • the radius of curvature of the 180 ° elbow can of course not be reduced arbitrarily and the area occupied perpendicularly to the longitudinal axis of the waveguide section on the inlet side by the branching waveguide arms is a multiple of the square cross section on the inlet side.
  • the invention is therefore based on the object of providing a broadband polarizing switch of the type mentioned at the outset, which is of more compact construction and therefore has a smaller space requirement without the electrical properties being impaired thereby.
  • this object is achieved in that the lateral waveguide arms branch off from the waveguide section at an acute angle, are guided approximately parallel to the main direction given by the longitudinal axis of the waveguide section after switching on an E-plane bend, and after switching on another one , S-shaped E-level manifold converge in the broadband branch, and that the continuous waveguide arm is offset from the main direction by means of an S-shaped E-level manifold in parallel before the broadband branching.
  • the waveguide section on the input side and the two waveguide arms branching off from it laterally are now guided up to and including their union in the broadband branching in the same plane.
  • This and due to the fact that the two waveguide arms now branch off at an acute angle with respect to the main direction mentioned it is achieved that the Overall arrangement turns out much slimmer and the space requirement perpendicular to the main direction is significantly reduced. Only the continuous waveguide arm, since it runs directly to the broadband branch in which the two laterally branched waveguide arms converge, has to be guided out of the above-mentioned plane with the help of an S-shaped E-plane elbow and past the broadband branch .
  • the rectangular cross-sectional area of the laterally branching waveguide arms is reduced over their length with low-reflection transitions to a quarter of the cross-sectional area of the waveguide section on the input side.
  • a rectangular cross section is then created, which is equal to the halved square cross-sectional area of the waveguide section and at the same time represents a standard waveguide cross section.
  • the broadband polarization switch 1 shown in top and side views in FIGS. 1a and 1b has a waveguide section 4 on the input side, the square cross section of which is indicated on the left in FIG. 1b (side length a).
  • this waveguide section for example, the fundamental waves of the type H 1 and H 1, which are orthogonally linearly polarized with respect to one another, are capable of propagation (indicated on the left in FIG. 1 b).
  • rectangular coupling windows 11 are embedded in two opposite walls of the waveguide section 4. These take up the entire height a of the waveguide wall.
  • both lateral waveguide arms 2, 3 merge into S-shaped E-plane elbows 7 and unite in a broadband junction 8, giving an output cross section for one polarization that is equal to half the square cross section on the input side (standard waveguide cross section).
  • the waveguide section 4 on the input side is continued behind the coupling windows 11 as a continuous waveguide arm 9. Without a change in direction, the latter would directly meet the broadband junction 8, which lies in the same plane with the two waveguide arms 2, 3 on the side and the waveguide section on the input side, with respect to the respective central axes.
  • an S-shaped E-level elbow 10 through which the continuous waveguide arm 9 is led out of the above-mentioned level, that is to say is practically offset parallel to the main direction given by the longitudinal axis 6.
  • the two rectangular cross sections on the output side for the two now separate, orthogonally polarized waves are shown. These two initial cross sections each form half Cross-sectional area of the square cross-section on the input side and are rotated by 90 ° relative to one another.
  • the distance c between the two exits can of course be considerably reduced compared to the dimensioning shown in FIG. 1b by choosing a flatter S-shaped bend 10.
  • the total width of the polarization switch given by the laterally protruding waveguide arms 2 and 3 can also be reduced in comparison to the illustration in FIG. 1a, in that the E-plane elbow 5 is positioned directly behind the respective coupling window 11.
  • the broadband polarization filter according to the invention is a geometrically very slim arrangement and is therefore designed to be considerably cheaper in terms of space requirements than the known arrangement of DE-OS 26 described at the outset 51 935. It should be emphasized that this is not bought with any deterioration in the electrical properties. Rather, in addition to the compact and space-saving geometry, a broadband separation of orthogonal, linearly polarized waves is possible with good adaptation.
  • the angle ⁇ , at which the lateral waveguide arms 2, 3 branch off, is in principle not fixed from the outset, but can be adapted to the requirements in any configuration within limits.
  • conductive pins can be arranged in a known manner, in particular parallel to the E-vector of the shaft passing through, the position and dimensioning of which influence the adaptation of the shaft passing through. Furthermore, these pins reduce the formation of higher wave types in this waveguide area.
  • a planar separating structure 12 oriented in the form of a thin sheet, which is oriented perpendicular to the e-vector of the passing wave, can be arranged, which separates the coupling structure laterally through the coupling window Shaft lock function.
  • a planar separating structure 12 oriented in the form of a thin sheet, which is oriented perpendicular to the e-vector of the passing wave, can be arranged, which separates the coupling structure laterally through the coupling window Shaft lock function.
  • several sheets arranged symmetrically one above the other can also be provided. Because of their small thickness, these sheets have almost no influence on the shaft passing through.

Landscapes

  • Waveguide Switches, Polarizers, And Phase Shifters (AREA)

Claims (4)

  1. Jonction de polarisation à large bande pour la séparation d'ondes électromagnétiques, polarisées de façon orthogonale linéaire, comprenant une portion de guide d'ondes (4) côté entrée, de section rectangulaire ou carrée, des fenêtres de couplage (11) rectangulaires ménagées à des emplacements opposés dans les parois du guide d'ondes, perpendiculairement à l'axe longitudinal (6) de celui-ci, des branches de guide d'ondes (2, 3) de section rectangulaire, qui partent latéralement de ces fenêtres et débouchent, avec intercalage d'éléments coudés (5, 7), dans une dérivation (8) commune à large bande, la portion de guide d'ondes (4) côté entrée se prolongeant derrière les fenêtres de couplage (11), dans la direction axiale, sous la forme d'une branche (9) de guide d'ondes continue, à l'intérieur de laquelle est disposée une structure de séparation (12) plate, commençant derrière les fenêtres de couplage (11) et orientée perpendiculairement à celles-ci, caractérisée par le fait que les branches de guide d'ondes (2, 3) latérales bifurquent à partir de la portion de guide d'ondes (4) chaque fois sous un angle aigu (α), sont à peu près parallèles à la direction principale déterminée par l'axe longitudinal (6) de la portion de guide d'ondes (4), après intercalage d'un coude (5) de plan E, et convergent dans la dérivation (8) à large bande, après intercalage d'un autre coude (7) de plan E, en forme de S, et que, avant la dérivation (8) à large bande, la branche de guide d'ondes (9) continue est décalée parallèlement par rapport à la direction principale au moyen d'un coude (10) de plan E, en forme de S.
  2. Jonction de polarisation à large bande selon la revendication 1, caractérisée par le fait que les sections rectangulaires des branches de guide d'ondes (2, 3) latérales sont réduites, à l'aide de transitions à faible réflexion, sur la longueur des branches à environ un quart de la surface de section de la portion de guide d'ondes (4) côté entrée.
  3. Jonction de polarisation à large bande selon la revendication 1, caractérisée par le fait que, dans la branche de guide d'ondes (9) continue, la section carrée de la portion de guide d'ondes (4) côté entrée se transforme, avant le coude (10) de plan E, en forme de S, au moyen d'une transition à faible réflexion en une section rectangulaire dont la surface de section est divisée par deux.
  4. Jonction de polarisation à large bande selon l'une des revendications précédentes, caractérisée par le fait que la structure de séparation (12) est constituée d'une ou plusieurs tôles associées les unes aux autres en parallèle, qui, en direction de la portion de guide d'ondes (4), se terminent respectivement dans une pointe en forme de coin étagé.
EP19840114869 1983-12-16 1984-12-06 Filtre de polarisation à large bande Expired - Lifetime EP0147693B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833345689 DE3345689A1 (de) 1983-12-16 1983-12-16 Breitband-polarisationsweiche
DE3345689 1983-12-16

Publications (3)

Publication Number Publication Date
EP0147693A2 EP0147693A2 (fr) 1985-07-10
EP0147693A3 EP0147693A3 (en) 1988-03-16
EP0147693B1 true EP0147693B1 (fr) 1992-05-13

Family

ID=6217221

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840114869 Expired - Lifetime EP0147693B1 (fr) 1983-12-16 1984-12-06 Filtre de polarisation à large bande

Country Status (2)

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EP (1) EP0147693B1 (fr)
DE (1) DE3345689A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE58033T1 (de) * 1985-03-27 1990-11-15 Siemens Ag Polaristationsweiche fuer einrichtungen der hoechstfreqenztechnik.
DE3822981A1 (de) * 1988-07-07 1988-12-22 Kathrein Werke Kg Hohlleiter-polarisationsweiche
DE3824150A1 (de) * 1988-07-16 1989-07-06 Kathrein Werke Kg Hohlleiter-twist
EP0419892B1 (fr) * 1989-09-28 1995-11-29 Siemens Aktiengesellschaft Filtre de polarisation aux micro-ondes
DE4009288C2 (de) * 1990-03-22 1994-03-03 Siemens Ag Rechteckhohlleiter mit E-H-Doppelversatz

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL270085A (fr) * 1960-10-19
US3325751A (en) * 1964-08-04 1967-06-13 Robert M Phillips Means to directionally launch the te01 mode in a circular waveguide from the te10 mode in a rectangular waveguide
DE2521956C3 (de) * 1975-05-16 1978-07-13 Siemens Ag, 1000 Berlin Und 8000 Muenchen Polarisationsweiche
US4030048A (en) * 1976-07-06 1977-06-14 Rca Corporation Multimode coupling system including a funnel-shaped multimode coupler
DE2651935C3 (de) * 1976-11-13 1987-07-09 ANT Nachrichtentechnik GmbH, 7150 Backnang Breitbandige Polarisations-Weiche
US4176330A (en) * 1977-12-23 1979-11-27 Gte Sylvania Incorporated Diplexer apparatus
US4467294A (en) * 1981-12-17 1984-08-21 Vitalink Communications Corporation Waveguide apparatus and method for dual polarized and dual frequency signals

Also Published As

Publication number Publication date
DE3345689C2 (fr) 1992-04-09
EP0147693A3 (en) 1988-03-16
EP0147693A2 (fr) 1985-07-10
DE3345689A1 (de) 1985-07-11

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