EP0192186B1 - Polarisationsweiche - Google Patents

Polarisationsweiche Download PDF

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Publication number
EP0192186B1
EP0192186B1 EP19860101801 EP86101801A EP0192186B1 EP 0192186 B1 EP0192186 B1 EP 0192186B1 EP 19860101801 EP19860101801 EP 19860101801 EP 86101801 A EP86101801 A EP 86101801A EP 0192186 B1 EP0192186 B1 EP 0192186B1
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EP
European Patent Office
Prior art keywords
frequency
fundamental mode
filter
waveguide
orthogonal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19860101801
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English (en)
French (fr)
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EP0192186A1 (de
Inventor
Régis Lenormand
Philippe Gourlain
Jacques Morel
Bernard Theron
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.)
Alcatel Espace Industries SA
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Alcatel Espace Industries SA
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Publication date
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Publication of EP0192186A1 publication Critical patent/EP0192186A1/de
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/213—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies
    • H01P1/2131—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies with combining or separating polarisations
    • 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 present invention relates to a device making it possible to extract or excite the two orthogonal components of the fundamental mode propagating in a waveguide without affecting the other frequency bands which can also propagate therein.
  • the orthomode type duplexer which comprises a main guide, in the axis of which is placed a short-circuit blade, and another guide, called parallel access guide, orthogonal to the first and placed in a critical position with respect to this short circuit blade.
  • This very conventional device has the drawback of being limited to the use of a single frequency or frequency band, since the other frequencies or frequency bands cannot be propagated beyond this device.
  • a duplexing device is also known, as described in European patent application No. 98192, which comprises a main guide transporting both the frequency or frequency band to be multiplexed and other frequency bands, in particular a band of higher frequencies, and two access guides orthogonal to the main guide and orthogonal to each other which are coupled to the main guide by slots provided with resonators.
  • the access guides are not coplanar and are associated with short-circuit devices placed in the main guide and which are constituted by quasi-optical filters.
  • the use of these quasi-optical filters in this kind of device has the disadvantage of requiring a study and a rather delicate development.
  • this kind of filter is not a material which can be directly embarked on a satellite.
  • this type of device uses resonators, placed at the location of each of the coupling slots, which are also delicate and empirical focusing elements and which, because they are liable to break under the influence of vibrations, are hardly conceivable for the production of on-board equipment on satellite.
  • the present invention relates to a device as defined above which does not have the drawbacks of the devices known hitherto.
  • a device is particularly well suited to withstand the mechanical stresses required by boarding a satellite and it also makes it possible, by cascading several devices of this type, to excite or extract several frequencies. or frequency bands.
  • the invention therefore relates to a device according to claim 1.
  • the reference 1 designates what will be called the main guide, which in this example is a circular guide whose fundamental mode corresponds to the frequency of 19 Gigahertz, for example.
  • the upstream part of the guide 1, on the left in the figure, is connected in a manner not shown, but known per se, to a radiating element such as a horn equipping an antenna on board a telecommunications satellite.
  • the downstream part of the guide 1 is extended, by means of a conical transition 2, by another circular guide 3 whose fundamental mode corresponds to a frequency higher than that of the guide 1, for example 28 Gigahertz to fix the ideas.
  • the transition 2 is equivalent, for the fundamental mode of the guide 1, to a short circuit situated in a fictitious short-circuit plane 4.
  • the transition 2 could be abrupt instead of conical, or could be replaced by an equivalent device creating a fictitious short-circuit plan, such as a cavity device (s).
  • two access guides (5, 6) coplanar in the example considered, orthogonal to each other and orthogonal to the main guide 1, rectangular in this example, and operating at the same frequency as the main guide 1, are each coupled to said main guide 1 by a resonant slot respectively (7 and 8 respectively).
  • each guide (5 or 6) is connected to the associated resonant slot (7 or 8) by means of a filter (respectively 9 and 10).
  • Each filter (9 or 10) is, in the example considered, a low-pass filter which cuts all the frequencies higher than that corresponding to said fundamental mode of guide 1, that is to say 19 Gigahertz.
  • this filter is conventionally dimensioned so as to substantially reduce, on the associated coupling slot, 7 or 8, a short circuit for all the frequencies above the frequency considered, from 19 Gigahertz in our example.
  • a corrugated filter widely used in this technique.
  • From the receiving aerial for example, arrive on the one hand two waves of orthogonal polarizations at the frequency of 19 Gigahertz and, on the other hand, two waves of orthogonal polarizations at the frequency of 28 Gigahertz.
  • the waves at the lower frequency that is to say 19 Gigahertz, propagate in the circular guide 1 according to its fundamental mode and according to two orthogonal polarizations.
  • the first polarization is located in the plane of the figure and the second polarization is perpendicular to this plane.
  • the part of the two waves at 19 Gigahertz frequency which is not directed towards the guides 5 and 6 continues to propagate in the guide 1, then in the first part of the transition 2, in which it is reflected at the location of the short-circuit plane 4, to return to the coupling slots 7 and 8 which then direct them towards the guides 5 and 6, as explained previously.
  • the part of the wave, moreover negligible in practice, which is not directed at this time towards the guides 5 and 6, is then reflected towards the radiating element.
  • the distance between the short-circuit plane 4 and the radiating slots 7 and 8 is conventionally adjusted so that a maximum of reflected waves is absorbed by the access guides 5 and 6.
  • the two orthogonal waves whose frequency (28 Gigahertz) is greater than the frequency of the fundamental mode of the guide 1 propagate in this guide 1 without being derived by the couplers 6 and 7, which occur elsewhere, vis-à-vis of this frequency, like short circuits, then in transition 2, to continue their route in guide 3 towards a possible second separation device similar to that which has just been described.
  • the two access guides 5 and 6 are coplanar. It is obvious that the device would work the same if one of the access guides, 5 or 6, was located, upstream from the other, at a distance from the latter equal to one or more times half wavelength corresponding to the fundamental mode of guide 1.
  • the device which has just been described is susceptible of a certain number of interesting applications.
  • This allows, in the case where one receives in the main guide 1 a wave with circular polarization, to obtain at the opposite input of said coupler the corresponding linear polarization, and vice versa in the case of emission.
  • a polarizer has thus been formed without intervening on the main guide 1.
  • This same device envisaged only at reception, also makes it possible to obtain a constant reception level whatever the direction of linear polarization received.

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Claims (6)

1. Vorrichtung zum Abgreifen oder Anregen zweier zueinander senkrechter Komponenten der Grundwelle, die sich in einem Hohlleiter bei einer gegebenen Frequenz oder einem gegebenen Frequenzband ausbreiten kann, mit einem Haupthohlleiter (1), der der Grundwelle entspricht und über einen Übergang (2), der für die Grundwelle des Haupthohlleiters einem Kurzschluß in einer fiktiven Kurzschlußebene (4) entspricht, in einen weiteren Hohlleiter (3) mit kreisförmigem Querschnitt und geringerem Durchmesser übergeht, dessen Grundwelle einer höheren Frequenz als der des Haupthohlleiters (1) entspricht, und mit zwei Zugangshohlleitern (5, 6), die zum Haupthohlleiter und zueinander senkrecht verlaufen und jeweils an den Haupthohlleiter (1) über einen einfachen Resonanzschlitz (7, 8) gekoppelt ist, wobei jeder Zugangshohlleiter mit dem entsprechenden Schlitz (7, 8) über ein Filter (9, 10) verbunden ist, das dazu bestimmt ist, die genannte Frequenz oder das genannte Frequenzband auszuwählen, dadurch gekennzeichnet, daß jedes Filter ein Wellrohrfilter (9,10) ist, derart, daß sich für die Frequenzen außerhalb der genannten Frequenz oder des genannten Frequenzbandes im entsprechenden Resonanzschlitz (7,8) im wesentlichen ein Kurzschluß ergibt.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Zugangshohlleiter (5, 6) koplanar sind.
3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Zugangshohlleiter (5, 6) einen Abstand voneinander aufweisen, der einem Vielfachen der halben Wellenlänge entsprechend der Grundwelle des Haupthohlleiters (1) entspricht.
4. Vorrichtung nach einem beliebigen der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß jedes Filter (9, 10) ein Tiefpaßfilter ist.
5. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Übergang (2) eine Kegelform besitzt.
6. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß sie außerdem einen Hybridkoppler aufweist, dessen beide Ausgänge an je einen Ausgang (11, 12) der Zugangshohlleiter (5, 6) gekoppelt sind.
EP19860101801 1985-02-15 1986-02-13 Polarisationsweiche Expired - Lifetime EP0192186B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8502209 1985-02-15
FR8502209A FR2577719B1 (fr) 1985-02-15 1985-02-15 Duplexeur de polarisations

Publications (2)

Publication Number Publication Date
EP0192186A1 EP0192186A1 (de) 1986-08-27
EP0192186B1 true EP0192186B1 (de) 1990-10-24

Family

ID=9316319

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860101801 Expired - Lifetime EP0192186B1 (de) 1985-02-15 1986-02-13 Polarisationsweiche

Country Status (4)

Country Link
EP (1) EP0192186B1 (de)
DE (1) DE3675030D1 (de)
ES (1) ES8704294A1 (de)
FR (1) FR2577719B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2598034B1 (fr) * 1986-04-28 1988-08-26 Alcatel Espace Dispositif a joint tournant hyperfrequence
WO2011153606A1 (en) 2010-06-08 2011-12-15 National Research Council Of Canada Orthomode transducer

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB644768A (en) * 1948-10-15 1950-10-18 Mini Of Supply Improvements in and relating to waveguide devices
US2783439A (en) * 1952-01-03 1957-02-26 Bendix Aviat Corp Continuously rotatable microwave phase shifter
DE2443166C3 (de) * 1974-09-10 1985-05-30 ANT Nachrichtentechnik GmbH, 7150 Backnang Systemweiche zur Trennung zweier Signale, die aus je zwei doppelt polarisierten Frequenzbändern bestehen
US4052724A (en) * 1974-12-20 1977-10-04 Mitsubishi Denki Kabushiki Kaisha Branching filter
US4258366A (en) * 1979-01-31 1981-03-24 Nasa Multifrequency broadband polarized horn antenna
NL181064C (nl) * 1979-11-15 1987-06-01 Nederlanden Staat Microgolffilter.

Also Published As

Publication number Publication date
EP0192186A1 (de) 1986-08-27
DE3675030D1 (de) 1990-11-29
ES552011A0 (es) 1987-03-16
ES8704294A1 (es) 1987-03-16
FR2577719B1 (fr) 1987-05-29
FR2577719A1 (fr) 1986-08-22

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