EP0902496A2 - 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
EP0902496A2
EP0902496A2 EP98402039A EP98402039A EP0902496A2 EP 0902496 A2 EP0902496 A2 EP 0902496A2 EP 98402039 A EP98402039 A EP 98402039A EP 98402039 A EP98402039 A EP 98402039A EP 0902496 A2 EP0902496 A2 EP 0902496A2
Authority
EP
European Patent Office
Prior art keywords
cross
mode filter
pipe section
interior
filter according
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
EP98402039A
Other languages
German (de)
English (en)
Other versions
EP0902496A3 (fr
EP0902496B1 (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 Lucent SAS
Nokia Inc
Original Assignee
Alcatel SA
Nokia Inc
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, Nokia Inc filed Critical Alcatel SA
Publication of EP0902496A2 publication Critical patent/EP0902496A2/fr
Publication of EP0902496A3 publication Critical patent/EP0902496A3/fr
Application granted granted Critical
Publication of EP0902496B1 publication Critical patent/EP0902496B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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 that has openings at its ends, the cross sections of which Cross sections correspond to the two different waveguides and its interior passes from one cross-sectional shape to the other, in which the interior of the Pipe piece means to minimize unwanted modes of the transmitted electromagnetic waves are present.
  • Waveguides are used because of the low attenuation of those to be transmitted electromagnetic waves especially at higher frequencies, for example as Supply lines used for antennas.
  • the damping can, however, under certain circumstances still be too high if, for example, the transmission power is low or if no sufficiently large reflectors can be used.
  • the waveguide can then operated overmoded, d. H. with higher frequencies than for their Dimensions provided per se.
  • d. H. With higher frequencies than for their Dimensions provided per se.
  • the waveguides next to the desired basic fashion also stimulates unwanted, higher modes. That leads to one Ripples of the group delay and the amplitude of the basic mode, d. H. to a Fluctuation in its amplitude. That cannot be completely prevented by the Use of mode filters can be minimized.
  • a mode filter as described at the beginning, is made by the company RFS crememetal, Hanover, distributed. With such a mode filter, the unwanted modes uncoupled. For this purpose are in the wall of the mode filter designed as a tube piece Panels attached that lead to absorbers attached to the outside of the pipe section. The Absorbers are cooled during operation.
  • the invention has for its object the mode filter described in his Simplify construction.
  • This mode filter is very simple. It can be in the usual, for example for Transitions of known technology are made.
  • the two flat, electrically conductive Elements that are, for example, sheets or pins can can be easily installed and adjusted, for example, by slots in the pipe section. It has surprisingly found that just by the correctly positioned flat elements the greatest possible suppression of undesired modes is achieved. Become an absorber not required. Cooling is not necessary as there is no significant heating takes place.
  • the mode filter can therefore also be used with advantage for high outputs. 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.
  • Fig. 1 shows a schematic representation of an arrangement with a mode filter according to the Invention.
  • Fig. 4 shows the image of Fig. 2 without interior.
  • FIG. 5 shows a section through FIG. 4 along the line V - V.
  • Fig. 6 shows a section through Fig. 4 along the line VI - VI.
  • Fig. 7 shows a section through Fig. 2 along the line VII - VII.
  • the "flat elements" present in the mode filter can be sheets.
  • the sheets can also be comb-like in the interior of the mode filter without recesses pointing "tines". However, each element can also be made side by side arranged pins or strips exist.
  • the elements are marked 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 is in following the sheet as a "flat element" described.
  • a parabolic reflector 1 of an antenna is shown on the under Interposition of a mode filter 2 an electromagnetic waveguide 3 connected.
  • the cross-sectional shapes of the waveguide 3 and the waveguide input the antenna itself is arbitrary.
  • Has in the embodiment explained below 5 has an elliptical cross section, while the waveguide entrance 6 is rectangular.
  • the mode filter 2 connects accordingly an elliptical waveguide 3 with a rectangular waveguide entrance, the light Dimensions are also significantly smaller than that of the waveguide 3.
  • the mode filter 2 is designed according to FIG. 2 as a pipe section 4, at its two ends Flanges 5 and 6 are attached.
  • the flange 5 is used to connect the waveguide 3. He has a central, continuous opening 7 with an elliptical cross section that is the same 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, continuous opening 8, whose rectangular cross section is equal to the electrically effective cross section of the Waveguide input of the antenna is.
  • the mode filter 2 can Reflector 1 are attached.
  • 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 to size with conventional technology.
  • the pipe section 4 is expediently produced by electrodeposition on a core, whose outer contour exactly the desired contour of the interior 11 of the pipe section 4 or the mode filter 2 corresponds.
  • the two flanges 5 and 6 are the same galvanized to the pipe section 4 It is also in the manufacture of the pipe section 4 possible, in its wall at two diametrically opposite points Form slots 12 and 13 (Fig. 4), which serve to receive sheets 14 and 15.
  • the interior 11 of the pipe section 4 is shaped so that preferably one Continuous, seamless transition from the elliptical cross section of the waveguide 3 to rectangular cross section of the waveguide input of the antenna results.
  • the interior 11 could also be provided with steps. There would then be a graded transition from one cross-sectional shape to another.
  • the sheets 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 section 4.
  • the sheets 14 and 15 are aligned with one another and lie one against the other according to FIG. 7 diametrically opposite in the same plane. They are through a space 16 separated from each other, which can be constant over their entire axial length.
  • Gap 16 can also be designed conically according to FIG. 2. He can with about conical course also have steps. 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 sheets 14 and 15 are preferably in the major axis of the ellipse, as in FIG Fig. 7 is shown.
  • the distance A between the two sheets 14 and 15 and their axial length are directed according to the frequency of the fundamental wave guided in the waveguide 3. It is adjusted by two sheets 14 and 15 dimensioned so that undesirable higher modes largely are suppressed and that their influence on the fundamental wave is minimized. That means, that the size of the "ripples" created by superimposing the different modes is kept as small as possible so that the ripple of the fundamental wave within narrow limits can be held.
  • the sheets 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 manufactured. You can use for example after completion of the pipe section 4 connected flanges 5 and 6 through the slots 12 and 13 of the pipe section 4 in the same can be inserted. Your position, i.e. their distance A from each other will for example, by means of a template protruding into the pipe section 4. In in this position, the sheets 14 and 15 are firmly connected to the pipe section 4, for example soldered. Finally, 4 projecting parts the sheets 14 and 15 are separated so that there is a smooth surface for the pipe section 4 results.
  • the template only needs once for a certain type of mode filter to be made. It can then be used to produce a large reproducible Number of mode filters can be used.
  • the sheets 14 and 15 as well as the flanges 5 and 6 when galvanizing the pipe section 4 with be electroplated.
  • the corresponding core needs for one type of mode filter as well as the template mentioned above, to be made only once.

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  • Filters And Equalizers (AREA)
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
DE19739589A DE19739589A1 (de) 1997-09-10 1997-09-10 Modenfilter zur Verbindung von zwei elektromagnetischen Hohlleitern
DE19739589 1997-09-10

Publications (3)

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

Family

ID=7841781

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

Family Cites Families (9)

* 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
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
EP0309850B1 (fr) * 1987-09-28 1993-08-11 Siemens Aktiengesellschaft Dispositif d'élimination de modes électromagnétiques parasites dans des installations à guides d'ondes

Also Published As

Publication number Publication date
US6130586A (en) 2000-10-10
EP0902496A3 (fr) 2000-04-26
EP0902496B1 (fr) 2005-10-26
DE59813133D1 (de) 2005-12-01
AU739585B2 (en) 2001-10-18
BR9803406A (pt) 1999-11-03
AU8198098A (en) 1999-03-25
DE19739589A1 (de) 1999-03-11

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