EP0902496B1 - Filtre à modes pour la connection de deux guides d'ondes électromagnétiques - Google Patents

Filtre à modes pour la connection de deux guides d'ondes électromagnétiques Download PDF

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Publication number
EP0902496B1
EP0902496B1 EP98402039A EP98402039A EP0902496B1 EP 0902496 B1 EP0902496 B1 EP 0902496B1 EP 98402039 A EP98402039 A EP 98402039A EP 98402039 A EP98402039 A EP 98402039A EP 0902496 B1 EP0902496 B1 EP 0902496B1
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EP
European Patent Office
Prior art keywords
mode filter
tubular section
elements
cross
slim
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
EP98402039A
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German (de)
English (en)
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EP0902496A3 (fr
EP0902496A2 (fr
Inventor
Dietmar Schulz
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 CIT SA
Alcatel Lucent SAS
Original Assignee
Alcatel CIT SA
Alcatel SA
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Publication date
Application filed by Alcatel CIT SA, Alcatel SA filed Critical Alcatel CIT SA
Publication of EP0902496A2 publication Critical patent/EP0902496A2/fr
Publication of EP0902496A3 publication Critical patent/EP0902496A3/fr
Application granted granted Critical
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
    • H01P5/082—Transitions between hollow waveguides of different shape, e.g. between a rectangular and a circular waveguide

Definitions

  • the invention relates to a mode filter for connecting two electromagnetic Waveguides with different cross-sectional shapes, consisting of a piece of pipe to the its ends has openings whose cross sections the cross sections of the two correspond to different waveguide and the interior of which has a cross-sectional shape merges into the other, in which in the interior of the pipe section means for minimization unwanted modes of the electromagnetic waves to be transmitted are present.
  • Waveguides are due to the low attenuation of the electromagnetic to be transmitted Waves, in particular at higher frequencies, for example as supply lines for Antennas used.
  • the damping may still be too high, if, for example, the transmission power is low or if it is not sufficiently large Reflectors can be used.
  • the waveguides can then be operated overmoded be, d. H. provided with higher frequencies than for their dimensions in itself. Thereby are in the waveguides in addition to the desired fundamental mode also undesirable, higher Fashions excited. This leads to a ripples of the group delay and the amplitude of the basic mode, d. H. to a fluctuation in the amplitude thereof. That cant be completely prevented, but minimized by the use of fashion filters.
  • a mode filter as described at the outset, is manufactured by the company RFS crememetal, Hanover, Germany. distributed. With such a mode filter, the unwanted modes are decoupled.
  • the invention is based on the object, the initially described mode filter in his Simplify construction.
  • This fashion filter is very simple. It can be common, for example, for transitions known technique are produced.
  • the two flat, electrically conductive Elements that are, for example, sheets or pens can For example, be easily mounted and adjusted by slots in the pipe section. It has Surprisingly found that only by the properly positioned flat elements a suppression of unwanted modes is achieved as far as possible. Be absorber not required. Cooling is not required as there is no significant heating takes place. The mode filter is therefore advantageously usable for high power.
  • the Ripple of the group delay and the amplitude of the desired, to be transmitted Wave is thus easily acceptable to a wide range of performance Minimum reduced.
  • the "flat elements" present in the mode filter can be sheets.
  • the sheets can without recesses but also comb-like with in the interior of the fashion filter pointing "tines" be executed.
  • Each element can also be made side by side arranged pins or strips exist.
  • the elements are labeled with the word "flat" flat structures marked. They run at the same thickness in the pipe section i. w. in the radial direction. Representing all possible embodiments will be in following the sheet described as a "flat element".
  • a parabolic reflector 1 of an antenna is shown, to the lower Interposition of a mode filter 2 an electromagnetic waveguide 3rd connected.
  • the cross-sectional shapes of the waveguide 3 and the waveguide input the antenna are arbitrary.
  • the waveguide 3 according to FIG. 5 an elliptical cross section, while the waveguide input the antenna of FIG. 6 is rectangular.
  • the mode filter 2 connects accordingly an elliptical waveguide 3 with a rectangular waveguide input whose light Dimensions are also significantly smaller than that of the waveguide 3.
  • the mode filter 2 is formed as shown in FIG. 2 as a pipe section 4, at both ends thereof Flanges 5 and 6 are attached.
  • the flange 5 serves to connect the waveguide 3.
  • Er has a central, continuous opening 7 with an elliptical cross section, the same is the electrically effective cross section of the waveguide 3.
  • the flange 6 At the opposite end of the pipe section 4 is the flange 6 with a central, through-opening 8, whose rectangular cross section is equal to the electrically effective cross section of Waveguide input of the antenna is.
  • the mode filter 2 on Reflector 1 are attached.
  • sealing elements can be arranged in the circumferential grooves 9 and 10 of the two flanges. 5 and 6, sealing elements can be arranged.
  • the flanges 5 and 6 can be made dimensionally accurate in conventional technology.
  • the pipe section 4 is produced by electrodeposition on a core, whose outer contour exactly the desired contour of the interior 11 of the pipe section 4 and the mode filter 2 corresponds.
  • the two flanges 5 and 6 are equal to angalvaninstrument to the pipe section 4.
  • the interior 11 of the pipe section 4 is shaped so that preferably a continuous, offset transition from the elliptical cross section of the waveguide 3 to rectangular section of the waveguide input of the antenna results.
  • the interior 11 but could also be provided with steps. There would then be a stepped transition from one cross-sectional shape to another.
  • the plates 14 and 15 are arranged. They protrude radially into the pipe section 4 and run in the same axial direction. Their axial length is small in relation to the length of the Pipe 4.
  • the plates 14 and 15 are aligned with each other and each other as shown in FIG. 7 diametrically opposite in the same plane. They are through a gap 16 separated from each other, which can be consistent over its entire axial length.
  • Gap 16 may be performed as shown in FIG. 2 also conical. He can with about have conical course also stages. This is useful, for example, when using Pins in place of the sheets.
  • the waveguide 3 and the opening 7 of the flange 5 have an elliptical cross-section.
  • the plates 14 and 15 are preferably in the major axis of the ellipse, as in Fig. 7 is shown.
  • the plates 14 and 15 are made of electrically highly conductive material, such as copper or Aluminum. In a preferred embodiment, they are made of bronze or brass produced. You can, for example, after completion of the pipe section 4 with connected flanges 5 and 6 through the slots 12 and 13 of the pipe section 4 in the same be inserted. Your position, d. H. their distance A from each other, will be there For example, adjusted by means of a projecting into the pipe section 4 template. In this position, the plates 14 and 15 are firmly connected to the pipe section 4, for example soldered. Finally, over the pipe section 4 protruding parts the sheets 14 and 15 separated so that a smooth surface for the pipe section. 4 results.
  • the template needs only once for a particular type of mode filter to be made. It can then be used for the reproducible production of a large Number of mode filters are used.

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Claims (6)

  1. Filtre à un filtre à modes pour la connexion de deux guides d'ondes électromagnétiques dont les sections transversales sont de formes différentes, composé d'un élément tubulaire qui présente à ses extrémités des ouvertures dont les sections transversales correspondent aux sections transversales des deux guides d'ondes différents et dont l'espace intérieur transite de l'une des formes de section transversale à l'autre, avec lequel il existe dans l'espace intérieur de l'élément tubulaire des moyens destinés à réduire les modes non souhaités des ondes électromagnétiques à transmettre, et que dans l'espace intérieur (11) de l'élément tubulaire (4), dans la zone de transition entre les deux formes de la section transversale sont montés des éléments plats en matériau bon conducteur d'électricité qui pénètrent dans le sens radial dans l'élément tubulaire (4) et s'étendent dans son sens axial, les éléments sont séparés l'un de l'autre par un espace intermédiaire (16) en partant de la paroi de l'élément tubulaire (4) et sont disposés dans l'alignement l'un de l'autre en étant diamétralement opposés dans le même plan, leur longueur axiale étant courte par rapport à la longueur de l'élément tubulaire (4), caractérisé en ce que l'espace intérieur (11) de l'élément tubulaire (4) est configuré avec une transition continue et sans paliers d'une section transversale à l'autre, l'écart (A) entre les deux éléments plats (14 et 15) et leur longueur axiale étant définis en fonction de la fréquence de l'onde fondamentale guidée dans le guide d'ondes (3) et l'écart (A) étant dimensionné en ajustant les deux éléments plats (14 et 15) de manière à atténuer le plus possible les modes plus élevés non souhaités et à réduire leur influence sur l'onde fondamentale, de manière à ce que la taille des ondulations provoquées par la superposition des différents modes soit maintenue la plus petite possible et que l'ondulation de l'onde fondamentale puisse être maintenue dans des limites étroites.
  2. Filtre à modes selon la revendication 1, caractérisé en ce que les éléments plats utilisés sont des tôles (14, 15).
  3. Filtre à modes selon la revendication 1, caractérisé en ce que les éléments plats sont formés par des broches.
  4. Filtre à modes selon l'une des revendications 1 à 3, caractérisé en ce que lorsque le guide d'ondes (3) à relier est réalisé sous la forme d'un guide d'ondes elliptique, le plan dans lequel sont disposés les éléments plats se trouve dans le grand axe de la partie elliptique de l'espace intérieur (11) de l'élément tubulaire (4).
  5. Filtre à modes selon l'une des revendications 1 à 4, caractérisé en ce que les éléments plats sont en bronze.
  6. Filtre à modes selon l'une des revendications 1 à 4, caractérisé en ce que les éléments plats sont en laiton.
EP98402039A 1997-09-10 1998-08-11 Filtre à modes pour la connection de deux guides d'ondes électromagnétiques Expired - Lifetime EP0902496B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19739589 1997-09-10
DE19739589A DE19739589A1 (de) 1997-09-10 1997-09-10 Modenfilter zur Verbindung von zwei elektromagnetischen Hohlleitern

Publications (3)

Publication Number Publication Date
EP0902496A2 EP0902496A2 (fr) 1999-03-17
EP0902496A3 EP0902496A3 (fr) 2000-04-26
EP0902496B1 true EP0902496B1 (fr) 2005-10-26

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP98402039A Expired - Lifetime EP0902496B1 (fr) 1997-09-10 1998-08-11 Filtre à modes pour la connection de deux guides d'ondes électromagnétiques

Country Status (5)

Country Link
US (1) US6130586A (fr)
EP (1) EP0902496B1 (fr)
AU (1) AU739585B2 (fr)
BR (1) BR9803406A (fr)
DE (2) DE19739589A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1223636A1 (fr) * 2000-12-19 2002-07-17 Spinner GmbH Elektrotechnische Fabrik Transition de guide d'ondes surmodée et sa fabrication
US7893789B2 (en) 2006-12-12 2011-02-22 Andrew Llc Waveguide transitions and method of forming components
US9531048B2 (en) 2013-03-13 2016-12-27 Space Systems/Loral, Llc Mode filter

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1271229B (de) * 1965-02-25 1968-06-27 Telefunken Patent Breitbandiges, reflexionsarmes UEbergangselement zum Anschliessen eines ungefaehr elliptischen Wellenrohrleiters an einen starren Rechteckhohlleiter

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2055443C3 (de) * 1970-11-11 1982-02-25 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Polarisationswandler für Mikrowellen
US3818383A (en) * 1973-02-27 1974-06-18 Andrew Corp Elliptical-to-rectangular waveguide transition
US4100514A (en) * 1977-04-28 1978-07-11 Gte Sylvania Incorporated Broadband microwave polarizer device
US4344053A (en) * 1981-02-12 1982-08-10 Litton Systems, Inc. Mode suppressor for circular waveguides utilizing a plurality of resistance cards
US4553112A (en) * 1983-05-31 1985-11-12 Andrew Corporation Overmoded tapered waveguide transition having phase shifted higher order mode cancellation
US4540959A (en) * 1983-11-22 1985-09-10 Andrew Corporation Rectangular to elliptical waveguide connection
JPS60125001A (ja) * 1983-12-12 1985-07-04 Matsushita Electric Ind Co Ltd 導波管変換装置
DE3883127D1 (de) * 1987-09-28 1993-09-16 Siemens Ag Anordnung zur beseitigung stoerender elektromagnetischer schwingungsformen in hohlleiteranlagen.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1271229B (de) * 1965-02-25 1968-06-27 Telefunken Patent Breitbandiges, reflexionsarmes UEbergangselement zum Anschliessen eines ungefaehr elliptischen Wellenrohrleiters an einen starren Rechteckhohlleiter

Also Published As

Publication number Publication date
EP0902496A3 (fr) 2000-04-26
EP0902496A2 (fr) 1999-03-17
DE19739589A1 (de) 1999-03-11
AU8198098A (en) 1999-03-25
US6130586A (en) 2000-10-10
DE59813133D1 (de) 2005-12-01
BR9803406A (pt) 1999-11-03
AU739585B2 (en) 2001-10-18

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