EP0520919A1 - Filtervorrichtung für elektromagnetische Wellen in einem Wellenleiter mit Rotationssymmetrie, und eingefugten rechteckigen Wellenleiterstücken - Google Patents

Filtervorrichtung für elektromagnetische Wellen in einem Wellenleiter mit Rotationssymmetrie, und eingefugten rechteckigen Wellenleiterstücken Download PDF

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Publication number
EP0520919A1
EP0520919A1 EP92460018A EP92460018A EP0520919A1 EP 0520919 A1 EP0520919 A1 EP 0520919A1 EP 92460018 A EP92460018 A EP 92460018A EP 92460018 A EP92460018 A EP 92460018A EP 0520919 A1 EP0520919 A1 EP 0520919A1
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EP
European Patent Office
Prior art keywords
filtering
rectangular
sections
waveguide
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.)
Granted
Application number
EP92460018A
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English (en)
French (fr)
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EP0520919B1 (de
Inventor
Christian Sabatier
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.)
Orange SA
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France Telecom SA
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Publication of EP0520919A1 publication Critical patent/EP0520919A1/de
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—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
    • 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

Definitions

  • the field of the invention is that of filtering in the electromagnetic waveguides. More specifically, the invention relates to a device for filtering waves circulating in waveguides with symmetry of revolution, such as circular waveguides or coaxial waveguides used in TE11 mode.
  • the invention applies in particular to dual-band filtering.
  • An important use of this invention is in fact the production of bi-band and bi-polarization duplexers, in particular when the accesses of the duplexers are in the same standard of rectangular guide. This is for example the case of the bands 10.95-12.5 GHz and 14-14.5 GHz in WR 75. In general, the horizontal and vertical polarizations of these duplexers are not identical in the two frequency bands considered.
  • FIG. 1 is a schematic representation of such a duplexer, of known type.
  • the high band 11 for example 14-14.5 GHz
  • low band 12 for example 10.95-12.5 GHz
  • the outlet 13 towards the radiating element is in circular waveguide.
  • the excitation is done by coupling using a slot in the duplexer 14, between the rectangular guide and the circular guide. So that there is propagation of the wave towards the radiating element and not towards the high band access II as a rectangular guide, it is necessary to place a rectangular to circular transition 15 and a polarization filter 16 between the access high band 11 and duplexer 14.
  • FIG. 2 shows a metal blade filter 21, and FIG. 3 a metal wire filter 31, 32, 33.
  • a 1 degree error in the positioning of this blade 21 or of these wires 31, 32, 33 leads to a decoupling (transmission of the electromagnetic wave from access 11 to access 12) maximum of 35 dB, which is generally insufficient.
  • the production of these devices therefore requires great precision in the placement and fixing of the blade 21 or of the wires 31, 32, 33 inside the circular guide 22.
  • the manufacture of such filters requires several steps successive and delicate.
  • the invention particularly aims to overcome the disadvantages of these polarization filters according to the prior art.
  • an objective of the invention is to provide a filtering device for waveguides with symmetry of revolution which is easily achievable, from the mechanical point of view, and in particular a filtering device not requiring the transfer of elements inside the waveguide.
  • Another objective of the invention is to provide such a filtering device providing satisfactory decoupling, of at least 40 to 45 dB.
  • a particular objective of the invention is to provide such a filtering device allowing the total reflection of one polarization, and the total transmission of the other polarization, in a given frequency band.
  • the invention also has the additional objective of providing such a device, making it possible to pass from a linear polarization to a circular polarization.
  • a device for filtering electromagnetic waves circulating in a main waveguide element with symmetry of revolution s' extending along an axis of symmetry said device comprising at least one rectangular waveguide section, inserted in substitution in said main waveguide element, each transition between said main waveguide element and each of said sections of filtering being formed by a metal wall substantially perpendicular to said axis of symmetry, the number and the geometric and / or dimensional characteristics of said rectangular waveguide sections being chosen so as to constitute a profile filter predetermined filtering.
  • These rectangular waveguide sections introduce an asymmetry into the main waveguide. According to their geometrical characteristics, their number and their spacing, they make it possible for example to obtain a filter having a reflection coefficient close to 1 for one of the polarizations, and a reflection coefficient close to 0 for the other polarization, in a given frequency band. For other dimensions, it is also possible that there is no longer any overlap between the filtered band and the bandwidth of the filter.
  • each section is abrupt (that is to say, it consists of a wall substantially perpendicular to the axis of symmetry of the main guide). No particular element of progressive transition, or of adaptation, is necessary between the main waveguide and the filtering sections. These abrupt transitions are of course closed by a metallic conductor on the part of the transition where the two sections of the rectangular and circular guides do not coincide (otherwise, the waves would no longer be guided).
  • said main waveguide element is of the type of circular waveguides or of the type of coaxial waveguides in TE11 mode.
  • the width of said sections of rectangular waveguides is greater than or equal to the diameter of said main waveguide element.
  • said main waveguide element and said sections of rectangular guides are centered on said axis of symmetry.
  • the device of the invention comprises a set of at least two sections of rectangular waveguide inserted at spaced locations in said main waveguide element.
  • the number and the geometric and / or dimensional characteristics of said sections of rectangular waveguides are determined using modal analysis.
  • said linear polarization is advantageously parallel to a diagonal of the cross section of said sections of rectangular waveguides.
  • the invention also relates to the duplexers implementing a filtering device as described above.
  • the invention therefore relates in particular to a filtering device, produced by inserting rectangular sections of waveguides introducing asymmetry in a main waveguide with symmetry of revolution.
  • the main waveguide is a circular waveguide.
  • the main waveguide can also be, for example, a coaxial waveguide in TE11 mode. It is also possible to use, in conjunction with rectangular filter elements according to the invention, elements of guides of known type, said to be symmetric in revolution, provided that their symmetry is suppressed, for example by placing a dielectric strip along one of the polarizations.
  • FIG. 4 illustrates, according to a schematic perspective representation, a filter element according to the invention.
  • the circular main waveguide is separated into two parts 41 A and 41 B , between which a rectangular waveguide section 42 is inserted.
  • FIGS. 6A and 6B By combining several elements as shown in this FIG. 4, it is possible to produce a precise and effective filter, as illustrated in FIGS. 6A and 6B presented below.
  • the main waveguide 41 A , 41 B is connected to the rectangular section 42 by walls 44 A and 44 B which close the part of the transition on which the sections of the circular and rectangular guides do not coincide.
  • the walls 44 A and 44 A must be steep.
  • the walls 44 A and 44 B are substantially perpendicular to the axis of symmetry 45 of the main waveguide 41 A , 41 B. No transition element is inserted.
  • These walls 44 A and 44 B are metallic. They cannot of course be completely open (presence of air) or made of a dielectric. Otherwise, the wave could escape and would no longer be guided.
  • the circular guide 41 A is placed in the center of the rectangular guide 42, and the common section 43 of the two waveguides is circular.
  • the height of the rectangular guide 42 is therefore at least equal to the diameter of the circular guide 41 A.
  • all of the sections 41 A , 42, 41 B are centered on the same longitudinal axis, namely the axis of symmetry 45. In other applications, however, provision may be made for these sections are shifted.
  • the geometry of the rectangular guide section (height, width and thickness), as well as the number of sections and the spacing between these sections, depend on the characteristics desired for the filter. These different parameters can for example be determined according to the modal method.
  • the bandwidth can therefore be high (for example of the order of 10%).
  • the invention finds a preferred application in dual-band and bi-polarization duplexers such as that shown schematically in FIG. 1.
  • the polarization filter 16 must completely transmit the one of the polarizations, and reflect the other polarization.
  • the numerical example described below relates to such a filter, for the frequency band 12-13 GHz.
  • the polarization of the wave propagating in the circular guide can be placed along the diagonal of the rectangular guide.
  • the device of the invention can find numerous other applications, both in the field of filtering and in that of polarization.
  • FIG. 5 therefore presents the dimensions of a filter, the performance of which is illustrated by FIGS. 6A and 6B.
  • This filter consists of four sections of rectangular waveguides 51 A to 51 D , inserted in the circular waveguide 52.
  • the excitations are in TE11 mode in the circular waveguide 52.
  • this embodiment does not correspond to an optimized filter, but aims to allow the validation of a software calculation, as shown in FIGS. 6A and 6B.
  • FIG. 6A indeed shows the curve 61 A of the reflection coefficient of the filtering device of FIG. 5, when the polarization in TE11 mode in circular guide is perpendicular to the short side of the rectangular sections 51 A to 51 D.
  • the TE11 mode is completely transmitted on the frequency band 12-13 GHz, the reflection coefficient being close to 0.
  • the objective of this filter given by way of example is to provide a filtering result closest to that theoretically fixed by calculation for a given application, represented by a series 61A of + signs.
  • the curve 62 A of measured reflection shows that it is possible, with the device of the invention, to conform the filtering characteristics so precise. Indeed, it can be seen that the curve 62 A is very close to the desired results 61 A.
  • FIG. 6B shows the reflection coefficient of the same device, when the polarization of the TE11 mode in circular guide is parallel to the short side of the rectangular sections 51 A to 51 D. TE11 mode is then fully reflected for the frequency band 12-13 GHz. Indeed, the reflection coefficient close to 1, and the transmission is therefore zero.
  • the invention is of course not limited to the embodiment described above. It is in fact possible, for example, to produce filters using rectangular sections of different geometries. These different sections can then be joined or not, and separated by spaces of fixed or variable sizes.
  • the device of the invention can also be used for filtering a frequency band in a circular guide in TE11 mode, in the case of a rectilinear polarization.
  • Another application of the device of the invention is also the production of polarizers to transform a linear polarization into circular polarization.
  • a polarizer is a device which makes it possible to pass from a linear polarization to a circular polarization.
  • the linear polarization must be parallel to a diagonal of the rectangular guide.
  • a circular polarization is then obtained, the waves polarized horizontally and vertically not having the same phase speed in the rectangular guide.
  • a complete polarizer can be produced by combining several elements according to the invention or by combining them with other elements already known.

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  • Control Of Motors That Do Not Use Commutators (AREA)
  • Waveguide Switches, Polarizers, And Phase Shifters (AREA)
EP92460018A 1991-06-26 1992-06-24 Filtervorrichtung für elektromagnetische Wellen in einem Wellenleiter mit Rotationssymmetrie, und eingefugten rechteckigen Wellenleiterstücken Expired - Lifetime EP0520919B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9108137A FR2678434B1 (fr) 1991-06-26 1991-06-26 Dispositif de filtrage d'ondes electromagnetiques circulant dans un guide d'ondes d'un premier type a symetrie de revolution, a troncons de guides d'ondes d'un second type inseres.
FR9108137 1991-06-26

Publications (2)

Publication Number Publication Date
EP0520919A1 true EP0520919A1 (de) 1992-12-30
EP0520919B1 EP0520919B1 (de) 1996-06-12

Family

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EP92460018A Expired - Lifetime EP0520919B1 (de) 1991-06-26 1992-06-24 Filtervorrichtung für elektromagnetische Wellen in einem Wellenleiter mit Rotationssymmetrie, und eingefugten rechteckigen Wellenleiterstücken

Country Status (5)

Country Link
US (1) US5309128A (de)
EP (1) EP0520919B1 (de)
JP (1) JPH05235605A (de)
DE (1) DE69211428T2 (de)
FR (1) FR2678434B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115377638A (zh) * 2022-06-23 2022-11-22 湖南大学 一种高功率微波同轴tem-圆波导te11模式转换器

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2853143A1 (fr) * 2003-03-31 2004-10-01 Thomson Licensing Sa Filtre flottant hyperfrequence en structure guide d'onde

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB582856A (en) * 1944-07-05 1946-11-29 John Betteley Birks Improvements in or relating to electromagnetic radiators or receivers
US2719274A (en) * 1951-07-09 1955-09-27 Gen Precision Lab Inc Microwave switches
DE3326829A1 (de) * 1983-07-26 1985-02-14 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Verfahren zur herstellung eines mehrkreisigen mikrowellen-bandpassfilters, insbesondere fuer den millimeterwellenbereich
GB2166297A (en) * 1984-10-27 1986-04-30 Kabelmetal Electro Gmbh Antenna exciter for at least two frequency bands
DE3613474A1 (de) * 1986-04-22 1987-10-29 Licentia Gmbh Hohlleiter-polarisationswandler
US4725795A (en) * 1985-08-19 1988-02-16 Hughes Aircraft Co. Corrugated ridge waveguide phase shifting structure
US4906951A (en) * 1989-02-15 1990-03-06 United States Department Of Energy Birefringent corrugated waveguide

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6248101A (ja) * 1985-08-27 1987-03-02 Alps Electric Co Ltd 導波管フイルタ
US4920351A (en) * 1986-03-24 1990-04-24 Computer Science Inovations, Inc. Diplexer for orthogonally polarized transmit/receive signalling on common frequency
US4780694A (en) * 1987-11-23 1988-10-25 Hughes Aircraft Company Directional filter system
CA1251835A (en) * 1988-04-05 1989-03-28 Wai-Cheung Tang Dielectric image-resonator multiplexer
US5184098A (en) * 1992-02-10 1993-02-02 Hughes Aircraft Company Switchable dual mode directional filter system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB582856A (en) * 1944-07-05 1946-11-29 John Betteley Birks Improvements in or relating to electromagnetic radiators or receivers
US2719274A (en) * 1951-07-09 1955-09-27 Gen Precision Lab Inc Microwave switches
DE3326829A1 (de) * 1983-07-26 1985-02-14 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Verfahren zur herstellung eines mehrkreisigen mikrowellen-bandpassfilters, insbesondere fuer den millimeterwellenbereich
GB2166297A (en) * 1984-10-27 1986-04-30 Kabelmetal Electro Gmbh Antenna exciter for at least two frequency bands
US4725795A (en) * 1985-08-19 1988-02-16 Hughes Aircraft Co. Corrugated ridge waveguide phase shifting structure
DE3613474A1 (de) * 1986-04-22 1987-10-29 Licentia Gmbh Hohlleiter-polarisationswandler
US4906951A (en) * 1989-02-15 1990-03-06 United States Department Of Energy Birefringent corrugated waveguide

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
16TH EUROPEAN MICROWAVE CONFERENCE 8-12 septembre 1986,Dublin,Irlande MICROWAVE EXHIBITIONS AND PUBLISHERS LTD,Kent, GB,1986 B.Ladanyi-Turoczy: waveguide polarizer pages 441-446 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115377638A (zh) * 2022-06-23 2022-11-22 湖南大学 一种高功率微波同轴tem-圆波导te11模式转换器
CN115377638B (zh) * 2022-06-23 2023-03-14 湖南大学 一种高功率微波同轴tem-圆波导te11模式转换器

Also Published As

Publication number Publication date
US5309128A (en) 1994-05-03
JPH05235605A (ja) 1993-09-10
DE69211428D1 (de) 1996-07-18
EP0520919B1 (de) 1996-06-12
FR2678434A1 (fr) 1992-12-31
DE69211428T2 (de) 1997-02-13
FR2678434B1 (fr) 1994-02-04

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