EP0895298A1 - Antenne für Zirkularpolarisation in einer Drehrichtung - Google Patents

Antenne für Zirkularpolarisation in einer Drehrichtung Download PDF

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Publication number
EP0895298A1
EP0895298A1 EP98401748A EP98401748A EP0895298A1 EP 0895298 A1 EP0895298 A1 EP 0895298A1 EP 98401748 A EP98401748 A EP 98401748A EP 98401748 A EP98401748 A EP 98401748A EP 0895298 A1 EP0895298 A1 EP 0895298A1
Authority
EP
European Patent Office
Prior art keywords
filter
mode
modes
guide
circular
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.)
Withdrawn
Application number
EP98401748A
Other languages
English (en)
French (fr)
Inventor
Thierry Dusseux
Emmanuelle Husse
Hervé Legay
Michel Pauchet
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 Lucent SAS
Original Assignee
Alcatel SA
Alcatel Alsthom Compagnie Generale dElectricite
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Alcatel SA, Alcatel Alsthom Compagnie Generale dElectricite filed Critical Alcatel SA
Publication of EP0895298A1 publication Critical patent/EP0895298A1/de
Withdrawn legal-status Critical Current

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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
    • H01P1/165—Auxiliary devices for rotating the plane of polarisation
    • H01P1/17—Auxiliary devices for rotating the plane of polarisation for producing a continuously rotating polarisation, e.g. circular polarisation
    • H01P1/173—Auxiliary devices for rotating the plane of polarisation for producing a continuously rotating polarisation, e.g. circular polarisation using a conductive element

Definitions

  • the invention relates to a transmitting antenna and receiving circularly polarized radiation one sense, of the type comprising a frequency filter and a radiating element in order to transmit or receive in a predetermined frequency band, called useful band. She applies more particularly to active antennas whose the useful band is located in the microwave range.
  • the filter allows to adjust the width of the useful band radiated by the radiating element and to respect specifications given for rejection outside the useful band.
  • These antennas have, in transition between the filter and the radiating element, a single-mode link which achieves the interconnection between these elements; this bond singlemode is associated with a polarizer in order to power the radiating element so as to generate polarization circular wave emitted.
  • This single mode link of significant mass and length, constitutes an obstacle to a reduction in weight and size of the antenna. In addition, it can cause energy losses not negligible.
  • the present invention proposes to provide an improved antenna of the aforementioned type, capable of benefit from a reduced overall size compared to known antennas.
  • Another objective is to allow significant reduction in antenna mass, advantage highly sought after in space applications.
  • Another objective is to reduce antenna manufacturing constraints and in particular to allow it to be made in one piece.
  • Another goal is to reduce losses energetic.
  • the antenna according to the invention is provided, between the filter and the radiating element, with a multimode selective device supporting the propagation of two orthogonal modes of transmission.
  • the medium polarizer excited by this multimode device generates two modes orthogonal returns which are used in transmission by the game of reflections to strengthen the generation of the circular polarization of the initial outward mode (Ma).
  • the multimode selective device can thus be considerably more compact and lighter than the link single mode of known antennas (which must have a sufficient length to limit return waves) and leads to reduced manufacturing constraints.
  • the filter, the selective device, the polarizing means and the element radiant can be made in one piece in one unique piece (especially in foundry) which avoids multiple fabrications and assemblies.
  • the resonance of the polarizing means at the frequency of the wave compound ensures emission energy efficiency improved compared to that of known antennas mentioned above.
  • the antenna conforms to the invention can be made of a metallic material electromagnetically linear.
  • the characteristics radioelectric obtained in emission are also in reception.
  • the frequency filter is an evanescent mode filter provided of a plurality of discontinuities that are aligned along of the longitudinal axis of the filter and which each have symmetry with respect to a longitudinal plane of symmetry of the filter.
  • the selective polarization device comprises then a circular section waveguide or rectangular with transverse dimensions suitable for supporting both basic modes orthogonal to the guide, a discontinuity being arranged at the filter / guide interface in alignment with discontinuities of the filter in order to allow one of the return modes (Rh) and reflect the other return mode (Rv).
  • Such an evanescent mode filter is a undercut filter with transverse dimensions reduced compared to those of other elements of the antenna, which facilitates the networking of the antenna by joining their radiating elements.
  • the frequency filter is a propagative filter with a single-mode output in rectangular waveguide or circular.
  • the selective polarization device comprises then a circular section waveguide or rectangular with transverse dimensions suitable for supporting both basic modes orthogonal of the guide, a wire grid or blades parallel metal being disposed at the interface filter / guide to pass one of the return modes (Rh) and reflect the other return mode (Rv).
  • the filter has transverse dimensions greater than those of the case previous but it allows for more choice of the width of the useful strip.
  • Such an antenna will be more particularly reserved for the case of a single antenna.
  • the polarizing means is preferably consisting of at least one non-symmetrical iris with respect to the plane containing the electric field of the mode go initial (Ma). Circular polarization is thus obtained by a very compact element which is arranged at the selective device interface in polarization / radiating element.
  • the selective polarization device and the radiating element are waveguides of dimensions appropriate to allow only the propagation of the two fundamental orthogonal modes.
  • the defined antenna previously can be associated with a plurality of antennas of the same type to create a network: we thus obtain a increased directivity antenna whose beam can be electronically pointable.
  • One direction circular polarization antenna which is shown by way of example in FIGS. 1 to 5, is intended to emit and receive radiation microwave in a useful width band predetermined, for example 500 MHz width centered around 12 GHz.
  • This antenna includes a filter frequency consisting of a rectangular waveguide 1 in evanescent fundamental mode, provided with lamellae such that 2 aligned along the axis of the guide and symmetrical by in relation to the longitudinal plane AA.
  • the rectangular section of this guide is appropriate for both modes of the guide are under the cut (sides of length less than ⁇ / 2).
  • This filter conventionally has a excitation input 3 provided with an adaptation strip 4, this input being intended to be connected to a amplifier, microwave generator and receiver microwave.
  • Guide 1 is extended by a guide cylindrical 5 allowing the propagation of the two modes orthogonal fundamentals.
  • the diameter of the guide 5 is greater than 0.586 ⁇ .
  • This guide 5 playing the role of selective polarization device is provided with a lamella 6 located at the interface of guides 1 and 5 in the alignment of the lamellae 2 of the guide 1 and in opposition by compared to the slats 2.
  • a iris polarizer 7 At the end of the guide 5 is disposed a iris polarizer 7 asymmetrical with respect to the plane AA.
  • the two walls forming this iris 7 are offset by an angle of 70 ° from the plane AA.
  • the length of guide 5 (separating the lamella 6 and iris 7 to form the selective device) is substantially equal to 0.4 ⁇ in order to establish beats in guide 5 such that iris 7 is excited by the modes compounds (initial outward and reflected modes). he should be emphasized that this length is considerably smaller than that of a link traditional single mode which requires a length of a few wavelengths (2 to 3 ⁇ ).
  • guide 5 extends by a waveguide 8 of identical circular section, acting as a radiating element.
  • the whole of the antenna described above is made in aluminum foundry in one piece.
  • guide 1 selects the microwave signal from the useful band and reflects the out-of-band signal to input 3.
  • the initial mode in the useful band passes through guide 1 and guide 5.
  • the iris generates two orthogonal return modes Rh and Rv.
  • Rh mode is reflected at the guide 1 / guide 5 interface since its electric field is in the plane perpendicular to the plane of symmetry AA of the filter.
  • Rh mode enters the filter and is reflected by the slats 2.
  • the return modes reflected through guide 5 and compose in mode go initial at the level of iris 7 to strengthen the circular polarization generated by it.
  • Figures 6 and 7 show a variant of the antenna described above. Its structure is identical except slats 2, 4 and 6 which are replaced by pads of circular section 9, 10 and 11 which have the same functions as said slats. The iris is tilted relative to the direction of the axis of these studs.
  • Figure 8 shows a network antenna 12 achieved by attaching and fixing a plurality of antennas elementary as described above, according to a hexagonal mesh.
  • Iris polarizers such as 13 and 14 various elementary antennas have the same example orientation in order to synchronize the radiation, which simplifies the management of excitation signals during transmission and, on reception, analysis of the signals received.
  • FIGS 9, 10 and 11 show another antenna embodiment according to the invention.
  • the frequency filter consists of a waveguide 15 of cylindrical shape, provided with a circular flange 16; this guide 15 is provided internally of a series of discontinuities formed by thick irises such as 17, symmetrical with respect to the HH plane containing the field electric of the initial outward mode. Guide 15 presents a internal diameter greater than 0.586 ⁇ in order to constitute a propagative filter having a single mode output 15a (for compared to the excitation of the initial outward mode).
  • the guide 15 has at its end a grid 18 formed of several transverse blades, each direction perpendicular to the HH plane containing the field electric of the initial outward mode; these blades are arranged so as to present their width according to the direction longitudinal of the guide. These blades are in the example reported.
  • Guide 15 extends beyond the grid 18 by a cylindrical guide 19 of the same section so to support the two fundamental orthogonal modes of guide.
  • This guide 19 provided with the grid 18 serves as selective polarization device and fulfills the same functions that the guide 5 provided with the lamella 6 previously described.
  • the polarizing iris 20 and the radiating element 21 are identical to their counterparts 7 and 8 of the antenna already described. Iris 20 is placed asymmetrically relative to the iris 17 of the filter.
  • the initial outward mode arrives at the grid 18 with an electric field perpendicular to the blades thereof and therefore is not disturbed by said wire rack.
  • One of the Rh return modes is not disturbed by the grid 18 and enters the filter 15 which reflects it, however that the other return mode Rv is reflected completely by the grid 18 since its electric field is parallel to the blades thereof.

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Aerials With Secondary Devices (AREA)
  • Waveguide Aerials (AREA)
EP98401748A 1997-07-28 1998-07-09 Antenne für Zirkularpolarisation in einer Drehrichtung Withdrawn EP0895298A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9709569 1997-07-28
FR9709569A FR2766625B1 (fr) 1997-07-28 1997-07-28 Antenne a polarisation circulaire un sens

Publications (1)

Publication Number Publication Date
EP0895298A1 true EP0895298A1 (de) 1999-02-03

Family

ID=9509705

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98401748A Withdrawn EP0895298A1 (de) 1997-07-28 1998-07-09 Antenne für Zirkularpolarisation in einer Drehrichtung

Country Status (4)

Country Link
US (1) US6100854A (de)
EP (1) EP0895298A1 (de)
CA (1) CA2242714A1 (de)
FR (1) FR2766625B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7957521B2 (en) * 2005-11-30 2011-06-07 On-Q Telecom Systems Co., Inc. Method and system for user prioritization within telecommunication services and in particular within call completion services

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB948827A (en) * 1960-12-21 1964-02-05 Marconi Co Ltd Improvements in or relating to circularly polarised microwave apparatus
EP0178259A2 (de) * 1984-10-10 1986-04-16 HUBER & SUHNER AG KABEL-, KAUTSCHUK-, KUNSTSTOFF-WERKE Hohlleiter mit Primärstrahler
EP0252269A1 (de) * 1986-06-07 1988-01-13 Hans Kolbe & Co. Konvertersystem

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3031661A (en) * 1956-10-31 1962-04-24 Bendix Corp Microwave antenna feed for circular polarization
DE3108758A1 (de) * 1981-03-07 1982-09-16 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Mikrowellen-empfangseinrichtung
US5162808A (en) * 1990-12-18 1992-11-10 Prodelin Corporation Antenna feed with selectable relative polarization
US5305001A (en) * 1992-06-29 1994-04-19 Hughes Aircraft Company Horn radiator assembly with stepped septum polarizer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB948827A (en) * 1960-12-21 1964-02-05 Marconi Co Ltd Improvements in or relating to circularly polarised microwave apparatus
EP0178259A2 (de) * 1984-10-10 1986-04-16 HUBER & SUHNER AG KABEL-, KAUTSCHUK-, KUNSTSTOFF-WERKE Hohlleiter mit Primärstrahler
EP0252269A1 (de) * 1986-06-07 1988-01-13 Hans Kolbe & Co. Konvertersystem

Also Published As

Publication number Publication date
FR2766625A1 (fr) 1999-01-29
CA2242714A1 (fr) 1999-01-28
US6100854A (en) 2000-08-08
FR2766625B1 (fr) 1999-09-03

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